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mbedtls/include/psa/crypto.h
Gilles Peskine 228abc5773 Define EC curve family constants 
Define constants for ECC curve families and DH group families. These
constants have 0x0000 in the lower 16 bits of the key type.

Support these constants in the implementation and in the PSA metadata
tests.

Switch the slot management and secure element driver HAL tests to the
new curve encodings. This requires SE driver code to become slightly
more clever when figuring out the bit-size of an imported EC key since
it now needs to take the data size into account.

Switch some documentation to the new encodings.

Remove the macro PSA_ECC_CURVE_BITS which can no longer be implemented.
2020-01-31 10:15:32 +01:00

3781 lines
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/**
* \file psa/crypto.h
* \brief Platform Security Architecture cryptography module
*/
/*
* Copyright (C) 2018, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef PSA_CRYPTO_H
#define PSA_CRYPTO_H
#include "crypto_platform.h"
#include <stddef.h>
#ifdef __DOXYGEN_ONLY__
/* This __DOXYGEN_ONLY__ block contains mock definitions for things that
* must be defined in the crypto_platform.h header. These mock definitions
* are present in this file as a convenience to generate pretty-printed
* documentation that includes those definitions. */
/** \defgroup platform Implementation-specific definitions
* @{
*/
/** \brief Key handle.
*
* This type represents open handles to keys. It must be an unsigned integral
* type. The choice of type is implementation-dependent.
*
* 0 is not a valid key handle. How other handle values are assigned is
* implementation-dependent.
*/
typedef _unsigned_integral_type_ psa_key_handle_t;
/**@}*/
#endif /* __DOXYGEN_ONLY__ */
#ifdef __cplusplus
extern "C" {
#endif
/* The file "crypto_types.h" declares types that encode errors,
* algorithms, key types, policies, etc. */
#include "crypto_types.h"
/** \defgroup version API version
* @{
*/
/**
* The major version of this implementation of the PSA Crypto API
*/
#define PSA_CRYPTO_API_VERSION_MAJOR 1
/**
* The minor version of this implementation of the PSA Crypto API
*/
#define PSA_CRYPTO_API_VERSION_MINOR 0
/**@}*/
/* The file "crypto_values.h" declares macros to build and analyze values
* of integral types defined in "crypto_types.h". */
#include "crypto_values.h"
/** \defgroup initialization Library initialization
* @{
*/
/**
* \brief Library initialization.
*
* Applications must call this function before calling any other
* function in this module.
*
* Applications may call this function more than once. Once a call
* succeeds, subsequent calls are guaranteed to succeed.
*
* If the application calls other functions before calling psa_crypto_init(),
* the behavior is undefined. Implementations are encouraged to either perform
* the operation as if the library had been initialized or to return
* #PSA_ERROR_BAD_STATE or some other applicable error. In particular,
* implementations should not return a success status if the lack of
* initialization may have security implications, for example due to improper
* seeding of the random number generator.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
*/
psa_status_t psa_crypto_init(void);
/**@}*/
/** \addtogroup attributes
* @{
*/
/** \def PSA_KEY_ATTRIBUTES_INIT
*
* This macro returns a suitable initializer for a key attribute structure
* of type #psa_key_attributes_t.
*/
#ifdef __DOXYGEN_ONLY__
/* This is an example definition for documentation purposes.
* Implementations should define a suitable value in `crypto_struct.h`.
*/
#define PSA_KEY_ATTRIBUTES_INIT {0}
#endif
/** Return an initial value for a key attributes structure.
*/
static psa_key_attributes_t psa_key_attributes_init(void);
/** Declare a key as persistent and set its key identifier.
*
* If the attribute structure currently declares the key as volatile (which
* is the default content of an attribute structure), this function sets
* the lifetime attribute to #PSA_KEY_LIFETIME_PERSISTENT.
*
* This function does not access storage, it merely stores the given
* value in the structure.
* The persistent key will be written to storage when the attribute
* structure is passed to a key creation function such as
* psa_import_key(), psa_generate_key(),
* psa_key_derivation_output_key() or psa_copy_key().
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param id The persistent identifier for the key.
*/
static void psa_set_key_id(psa_key_attributes_t *attributes,
psa_key_id_t id);
/** Set the location of a persistent key.
*
* To make a key persistent, you must give it a persistent key identifier
* with psa_set_key_id(). By default, a key that has a persistent identifier
* is stored in the default storage area identifier by
* #PSA_KEY_LIFETIME_PERSISTENT. Call this function to choose a storage
* area, or to explicitly declare the key as volatile.
*
* This function does not access storage, it merely stores the given
* value in the structure.
* The persistent key will be written to storage when the attribute
* structure is passed to a key creation function such as
* psa_import_key(), psa_generate_key(),
* psa_key_derivation_output_key() or psa_copy_key().
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param lifetime The lifetime for the key.
* If this is #PSA_KEY_LIFETIME_VOLATILE, the
* key will be volatile, and the key identifier
* attribute is reset to 0.
*/
static void psa_set_key_lifetime(psa_key_attributes_t *attributes,
psa_key_lifetime_t lifetime);
/** Retrieve the key identifier from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The persistent identifier stored in the attribute structure.
* This value is unspecified if the attribute structure declares
* the key as volatile.
*/
static psa_key_id_t psa_get_key_id(const psa_key_attributes_t *attributes);
/** Retrieve the lifetime from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The lifetime value stored in the attribute structure.
*/
static psa_key_lifetime_t psa_get_key_lifetime(
const psa_key_attributes_t *attributes);
/** Declare usage flags for a key.
*
* Usage flags are part of a key's usage policy. They encode what
* kind of operations are permitted on the key. For more details,
* refer to the documentation of the type #psa_key_usage_t.
*
* This function overwrites any usage flags
* previously set in \p attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param usage_flags The usage flags to write.
*/
static void psa_set_key_usage_flags(psa_key_attributes_t *attributes,
psa_key_usage_t usage_flags);
/** Retrieve the usage flags from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The usage flags stored in the attribute structure.
*/
static psa_key_usage_t psa_get_key_usage_flags(
const psa_key_attributes_t *attributes);
/** Declare the permitted algorithm policy for a key.
*
* The permitted algorithm policy of a key encodes which algorithm or
* algorithms are permitted to be used with this key. The following
* algorithm policies are supported:
* - 0 does not allow any cryptographic operation with the key. The key
* may be used for non-cryptographic actions such as exporting (if
* permitted by the usage flags).
* - An algorithm value permits this particular algorithm.
* - An algorithm wildcard built from #PSA_ALG_ANY_HASH allows the specified
* signature scheme with any hash algorithm.
*
* This function overwrites any algorithm policy
* previously set in \p attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param alg The permitted algorithm policy to write.
*/
static void psa_set_key_algorithm(psa_key_attributes_t *attributes,
psa_algorithm_t alg);
/** Retrieve the algorithm policy from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The algorithm stored in the attribute structure.
*/
static psa_algorithm_t psa_get_key_algorithm(
const psa_key_attributes_t *attributes);
/** Declare the type of a key.
*
* This function overwrites any key type
* previously set in \p attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param type The key type to write.
* If this is 0, the key type in \p attributes
* becomes unspecified.
*/
static void psa_set_key_type(psa_key_attributes_t *attributes,
psa_key_type_t type);
/** Declare the size of a key.
*
* This function overwrites any key size previously set in \p attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate each of its arguments exactly once.
*
* \param[out] attributes The attribute structure to write to.
* \param bits The key size in bits.
* If this is 0, the key size in \p attributes
* becomes unspecified. Keys of size 0 are
* not supported.
*/
static void psa_set_key_bits(psa_key_attributes_t *attributes,
size_t bits);
/** Retrieve the key type from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The key type stored in the attribute structure.
*/
static psa_key_type_t psa_get_key_type(const psa_key_attributes_t *attributes);
/** Retrieve the key size from key attributes.
*
* This function may be declared as `static` (i.e. without external
* linkage). This function may be provided as a function-like macro,
* but in this case it must evaluate its argument exactly once.
*
* \param[in] attributes The key attribute structure to query.
*
* \return The key size stored in the attribute structure, in bits.
*/
static size_t psa_get_key_bits(const psa_key_attributes_t *attributes);
/** Retrieve the attributes of a key.
*
* This function first resets the attribute structure as with
* psa_reset_key_attributes(). It then copies the attributes of
* the given key into the given attribute structure.
*
* \note This function may allocate memory or other resources.
* Once you have called this function on an attribute structure,
* you must call psa_reset_key_attributes() to free these resources.
*
* \param[in] handle Handle to the key to query.
* \param[in,out] attributes On success, the attributes of the key.
* On failure, equivalent to a
* freshly-initialized structure.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_get_key_attributes(psa_key_handle_t handle,
psa_key_attributes_t *attributes);
/** Reset a key attribute structure to a freshly initialized state.
*
* You must initialize the attribute structure as described in the
* documentation of the type #psa_key_attributes_t before calling this
* function. Once the structure has been initialized, you may call this
* function at any time.
*
* This function frees any auxiliary resources that the structure
* may contain.
*
* \param[in,out] attributes The attribute structure to reset.
*/
void psa_reset_key_attributes(psa_key_attributes_t *attributes);
/**@}*/
/** \defgroup key_management Key management
* @{
*/
/** Open a handle to an existing persistent key.
*
* Open a handle to a persistent key. A key is persistent if it was created
* with a lifetime other than #PSA_KEY_LIFETIME_VOLATILE. A persistent key
* always has a nonzero key identifier, set with psa_set_key_id() when
* creating the key. Implementations may provide additional pre-provisioned
* keys that can be opened with psa_open_key(). Such keys have a key identifier
* in the vendor range, as documented in the description of #psa_key_id_t.
*
* The application must eventually close the handle with psa_close_key() or
* psa_destroy_key() to release associated resources. If the application dies
* without calling one of these functions, the implementation should perform
* the equivalent of a call to psa_close_key().
*
* Some implementations permit an application to open the same key multiple
* times. If this is successful, each call to psa_open_key() will return a
* different key handle.
*
* \note Applications that rely on opening a key multiple times will not be
* portable to implementations that only permit a single key handle to be
* opened. See also :ref:\`key-handles\`.
*
* \param id The persistent identifier of the key.
* \param[out] handle On success, a handle to the key.
*
* \retval #PSA_SUCCESS
* Success. The application can now use the value of `*handle`
* to access the key.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* The implementation does not have sufficient resources to open the
* key. This can be due to reaching an implementation limit on the
* number of open keys, the number of open key handles, or available
* memory.
* \retval #PSA_ERROR_DOES_NOT_EXIST
* There is no persistent key with key identifier \p id.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p id is not a valid persistent key identifier.
* \retval #PSA_ERROR_NOT_PERMITTED
* The specified key exists, but the application does not have the
* permission to access it. Note that this specification does not
* define any way to create such a key, but it may be possible
* through implementation-specific means.
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_open_key(psa_key_id_t id,
psa_key_handle_t *handle);
/** Close a key handle.
*
* If the handle designates a volatile key, this will destroy the key material
* and free all associated resources, just like psa_destroy_key().
*
* If this is the last open handle to a persistent key, then closing the handle
* will free all resources associated with the key in volatile memory. The key
* data in persistent storage is not affected and can be opened again later
* with a call to psa_open_key().
*
* Closing the key handle makes the handle invalid, and the key handle
* must not be used again by the application.
*
* \note If the key handle was used to set up an active
* :ref:\`multipart operation <multipart-operations>\`, then closing the
* key handle can cause the multipart operation to fail. Applications should
* maintain the key handle until after the multipart operation has finished.
*
* \param handle The key handle to close.
* If this is \c 0, do nothing and return \c PSA_SUCCESS.
*
* \retval #PSA_SUCCESS
* \p handle was a valid handle or \c 0. It is now closed.
* \retval #PSA_ERROR_INVALID_HANDLE
* \p handle is not a valid handle nor \c 0.
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_close_key(psa_key_handle_t handle);
/** Make a copy of a key.
*
* Copy key material from one location to another.
*
* This function is primarily useful to copy a key from one location
* to another, since it populates a key using the material from
* another key which may have a different lifetime.
*
* This function may be used to share a key with a different party,
* subject to implementation-defined restrictions on key sharing.
*
* The policy on the source key must have the usage flag
* #PSA_KEY_USAGE_COPY set.
* This flag is sufficient to permit the copy if the key has the lifetime
* #PSA_KEY_LIFETIME_VOLATILE or #PSA_KEY_LIFETIME_PERSISTENT.
* Some secure elements do not provide a way to copy a key without
* making it extractable from the secure element. If a key is located
* in such a secure element, then the key must have both usage flags
* #PSA_KEY_USAGE_COPY and #PSA_KEY_USAGE_EXPORT in order to make
* a copy of the key outside the secure element.
*
* The resulting key may only be used in a way that conforms to
* both the policy of the original key and the policy specified in
* the \p attributes parameter:
* - The usage flags on the resulting key are the bitwise-and of the
* usage flags on the source policy and the usage flags in \p attributes.
* - If both allow the same algorithm or wildcard-based
* algorithm policy, the resulting key has the same algorithm policy.
* - If either of the policies allows an algorithm and the other policy
* allows a wildcard-based algorithm policy that includes this algorithm,
* the resulting key allows the same algorithm.
* - If the policies do not allow any algorithm in common, this function
* fails with the status #PSA_ERROR_INVALID_ARGUMENT.
*
* The effect of this function on implementation-defined attributes is
* implementation-defined.
*
* \param source_handle The key to copy. It must be a valid key handle.
* \param[in] attributes The attributes for the new key.
* They are used as follows:
* - The key type and size may be 0. If either is
* nonzero, it must match the corresponding
* attribute of the source key.
* - The key location (the lifetime and, for
* persistent keys, the key identifier) is
* used directly.
* - The policy constraints (usage flags and
* algorithm policy) are combined from
* the source key and \p attributes so that
* both sets of restrictions apply, as
* described in the documentation of this function.
* \param[out] target_handle On success, a handle to the newly created key.
* \c 0 on failure.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \p source_handle is invalid.
* \retval #PSA_ERROR_ALREADY_EXISTS
* This is an attempt to create a persistent key, and there is
* already a persistent key with the given identifier.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The lifetime or identifier in \p attributes are invalid.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The policy constraints on the source and specified in
* \p attributes are incompatible.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p attributes specifies a key type or key size
* which does not match the attributes of the source key.
* \retval #PSA_ERROR_NOT_PERMITTED
* The source key does not have the #PSA_KEY_USAGE_COPY usage flag.
* \retval #PSA_ERROR_NOT_PERMITTED
* The source key is not exportable and its lifetime does not
* allow copying it to the target's lifetime.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_INSUFFICIENT_STORAGE
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_copy_key(psa_key_handle_t source_handle,
const psa_key_attributes_t *attributes,
psa_key_handle_t *target_handle);
/**
* \brief Destroy a key.
*
* This function destroys a key from both volatile
* memory and, if applicable, non-volatile storage. Implementations shall
* make a best effort to ensure that that the key material cannot be recovered.
*
* This function also erases any metadata such as policies and frees
* resources associated with the key. To free all resources associated with
* the key, all handles to the key must be closed or destroyed.
*
* Destroying the key makes the handle invalid, and the key handle
* must not be used again by the application. Using other open handles to the
* destroyed key in a cryptographic operation will result in an error.
*
* If a key is currently in use in a multipart operation, then destroying the
* key will cause the multipart operation to fail.
*
* \param handle Handle to the key to erase.
* If this is \c 0, do nothing and return \c PSA_SUCCESS.
*
* \retval #PSA_SUCCESS
* \p handle was a valid handle and the key material that it
* referred to has been erased.
* Alternatively, \p handle is \c 0.
* \retval #PSA_ERROR_NOT_PERMITTED
* The key cannot be erased because it is
* read-only, either due to a policy or due to physical restrictions.
* \retval #PSA_ERROR_INVALID_HANDLE
* \p handle is not a valid handle nor \c 0.
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* There was an failure in communication with the cryptoprocessor.
* The key material may still be present in the cryptoprocessor.
* \retval #PSA_ERROR_STORAGE_FAILURE
* The storage is corrupted. Implementations shall make a best effort
* to erase key material even in this stage, however applications
* should be aware that it may be impossible to guarantee that the
* key material is not recoverable in such cases.
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* An unexpected condition which is not a storage corruption or
* a communication failure occurred. The cryptoprocessor may have
* been compromised.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_destroy_key(psa_key_handle_t handle);
/**@}*/
/** \defgroup import_export Key import and export
* @{
*/
/**
* \brief Import a key in binary format.
*
* This function supports any output from psa_export_key(). Refer to the
* documentation of psa_export_public_key() for the format of public keys
* and to the documentation of psa_export_key() for the format for
* other key types.
*
* The key data determines the key size. The attributes may optionally
* specify a key size; in this case it must match the size determined
* from the key data. A key size of 0 in \p attributes indicates that
* the key size is solely determined by the key data.
*
* Implementations must reject an attempt to import a key of size 0.
*
* This specification supports a single format for each key type.
* Implementations may support other formats as long as the standard
* format is supported. Implementations that support other formats
* should ensure that the formats are clearly unambiguous so as to
* minimize the risk that an invalid input is accidentally interpreted
* according to a different format.
*
* \param[in] attributes The attributes for the new key.
* The key size is always determined from the
* \p data buffer.
* If the key size in \p attributes is nonzero,
* it must be equal to the size from \p data.
* \param[out] handle On success, a handle to the newly created key.
* \c 0 on failure.
* \param[in] data Buffer containing the key data. The content of this
* buffer is interpreted according to the type declared
* in \p attributes.
* All implementations must support at least the format
* described in the documentation
* of psa_export_key() or psa_export_public_key() for
* the chosen type. Implementations may allow other
* formats, but should be conservative: implementations
* should err on the side of rejecting content if it
* may be erroneous (e.g. wrong type or truncated data).
* \param data_length Size of the \p data buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* If the key is persistent, the key material and the key's metadata
* have been saved to persistent storage.
* \retval #PSA_ERROR_ALREADY_EXISTS
* This is an attempt to create a persistent key, and there is
* already a persistent key with the given identifier.
* \retval #PSA_ERROR_NOT_SUPPORTED
* The key type or key size is not supported, either by the
* implementation in general or in this particular persistent location.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The key attributes, as a whole, are invalid.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The key data is not correctly formatted.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The size in \p attributes is nonzero and does not match the size
* of the key data.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_INSUFFICIENT_STORAGE
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_import_key(const psa_key_attributes_t *attributes,
const uint8_t *data,
size_t data_length,
psa_key_handle_t *handle);
/**
* \brief Export a key in binary format.
*
* The output of this function can be passed to psa_import_key() to
* create an equivalent object.
*
* If the implementation of psa_import_key() supports other formats
* beyond the format specified here, the output from psa_export_key()
* must use the representation specified here, not the original
* representation.
*
* For standard key types, the output format is as follows:
*
* - For symmetric keys (including MAC keys), the format is the
* raw bytes of the key.
* - For DES, the key data consists of 8 bytes. The parity bits must be
* correct.
* - For Triple-DES, the format is the concatenation of the
* two or three DES keys.
* - For RSA key pairs (#PSA_KEY_TYPE_RSA_KEY_PAIR), the format
* is the non-encrypted DER encoding of the representation defined by
* PKCS\#1 (RFC 8017) as `RSAPrivateKey`, version 0.
* ```
* RSAPrivateKey ::= SEQUENCE {
* version INTEGER, -- must be 0
* modulus INTEGER, -- n
* publicExponent INTEGER, -- e
* privateExponent INTEGER, -- d
* prime1 INTEGER, -- p
* prime2 INTEGER, -- q
* exponent1 INTEGER, -- d mod (p-1)
* exponent2 INTEGER, -- d mod (q-1)
* coefficient INTEGER, -- (inverse of q) mod p
* }
* ```
* - For elliptic curve key pairs (key types for which
* #PSA_KEY_TYPE_IS_ECC_KEY_PAIR is true), the format is
* a representation of the private value as a `ceiling(m/8)`-byte string
* where `m` is the bit size associated with the curve, i.e. the bit size
* of the order of the curve's coordinate field. This byte string is
* in little-endian order for Montgomery curves (curve types
* `PSA_ECC_CURVE_CURVEXXX`), and in big-endian order for Weierstrass
* curves (curve types `PSA_ECC_CURVE_SECTXXX`, `PSA_ECC_CURVE_SECPXXX`
* and `PSA_ECC_CURVE_BRAINPOOL_PXXX`).
* This is the content of the `privateKey` field of the `ECPrivateKey`
* format defined by RFC 5915.
* - For Diffie-Hellman key exchange key pairs (key types for which
* #PSA_KEY_TYPE_IS_DH_KEY_PAIR is true), the
* format is the representation of the private key `x` as a big-endian byte
* string. The length of the byte string is the private key size in bytes
* (leading zeroes are not stripped).
* - For public keys (key types for which #PSA_KEY_TYPE_IS_PUBLIC_KEY is
* true), the format is the same as for psa_export_public_key().
*
* The policy on the key must have the usage flag #PSA_KEY_USAGE_EXPORT set.
*
* \param handle Handle to the key to export.
* \param[out] data Buffer where the key data is to be written.
* \param data_size Size of the \p data buffer in bytes.
* \param[out] data_length On success, the number of bytes
* that make up the key data.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* The key does not have the #PSA_KEY_USAGE_EXPORT flag.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p data buffer is too small. You can determine a
* sufficient buffer size by calling
* #PSA_KEY_EXPORT_MAX_SIZE(\c type, \c bits)
* where \c type is the key type
* and \c bits is the key size in bits.
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_export_key(psa_key_handle_t handle,
uint8_t *data,
size_t data_size,
size_t *data_length);
/**
* \brief Export a public key or the public part of a key pair in binary format.
*
* The output of this function can be passed to psa_import_key() to
* create an object that is equivalent to the public key.
*
* This specification supports a single format for each key type.
* Implementations may support other formats as long as the standard
* format is supported. Implementations that support other formats
* should ensure that the formats are clearly unambiguous so as to
* minimize the risk that an invalid input is accidentally interpreted
* according to a different format.
*
* For standard key types, the output format is as follows:
* - For RSA public keys (#PSA_KEY_TYPE_RSA_PUBLIC_KEY), the DER encoding of
* the representation defined by RFC 3279 &sect;2.3.1 as `RSAPublicKey`.
* ```
* RSAPublicKey ::= SEQUENCE {
* modulus INTEGER, -- n
* publicExponent INTEGER } -- e
* ```
* - For elliptic curve public keys (key types for which
* #PSA_KEY_TYPE_IS_ECC_PUBLIC_KEY is true), the format is the uncompressed
* representation defined by SEC1 &sect;2.3.3 as the content of an ECPoint.
* Let `m` be the bit size associated with the curve, i.e. the bit size of
* `q` for a curve over `F_q`. The representation consists of:
* - The byte 0x04;
* - `x_P` as a `ceiling(m/8)`-byte string, big-endian;
* - `y_P` as a `ceiling(m/8)`-byte string, big-endian.
* - For Diffie-Hellman key exchange public keys (key types for which
* #PSA_KEY_TYPE_IS_DH_PUBLIC_KEY is true),
* the format is the representation of the public key `y = g^x mod p` as a
* big-endian byte string. The length of the byte string is the length of the
* base prime `p` in bytes.
*
* Exporting a public key object or the public part of a key pair is
* always permitted, regardless of the key's usage flags.
*
* \param handle Handle to the key to export.
* \param[out] data Buffer where the key data is to be written.
* \param data_size Size of the \p data buffer in bytes.
* \param[out] data_length On success, the number of bytes
* that make up the key data.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The key is neither a public key nor a key pair.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p data buffer is too small. You can determine a
* sufficient buffer size by calling
* #PSA_KEY_EXPORT_MAX_SIZE(#PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR(\c type), \c bits)
* where \c type is the key type
* and \c bits is the key size in bits.
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_export_public_key(psa_key_handle_t handle,
uint8_t *data,
size_t data_size,
size_t *data_length);
/**@}*/
/** \defgroup hash Message digests
* @{
*/
/** Calculate the hash (digest) of a message.
*
* \note To verify the hash of a message against an
* expected value, use psa_hash_compare() instead.
*
* \param alg The hash algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_HASH(\p alg) is true).
* \param[in] input Buffer containing the message to hash.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] hash Buffer where the hash is to be written.
* \param hash_size Size of the \p hash buffer in bytes.
* \param[out] hash_length On success, the number of bytes
* that make up the hash value. This is always
* #PSA_HASH_SIZE(\p alg).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a hash algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \p hash_size is too small
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_compute(psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *hash,
size_t hash_size,
size_t *hash_length);
/** Calculate the hash (digest) of a message and compare it with a
* reference value.
*
* \param alg The hash algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_HASH(\p alg) is true).
* \param[in] input Buffer containing the message to hash.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] hash Buffer containing the expected hash value.
* \param hash_length Size of the \p hash buffer in bytes.
*
* \retval #PSA_SUCCESS
* The expected hash is identical to the actual hash of the input.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The hash of the message was calculated successfully, but it
* differs from the expected hash.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a hash algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p input_length or \p hash_length do not match the hash size for \p alg
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_compare(psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *hash,
size_t hash_length);
/** The type of the state data structure for multipart hash operations.
*
* Before calling any function on a hash operation object, the application must
* initialize it by any of the following means:
* - Set the structure to all-bits-zero, for example:
* \code
* psa_hash_operation_t operation;
* memset(&operation, 0, sizeof(operation));
* \endcode
* - Initialize the structure to logical zero values, for example:
* \code
* psa_hash_operation_t operation = {0};
* \endcode
* - Initialize the structure to the initializer #PSA_HASH_OPERATION_INIT,
* for example:
* \code
* psa_hash_operation_t operation = PSA_HASH_OPERATION_INIT;
* \endcode
* - Assign the result of the function psa_hash_operation_init()
* to the structure, for example:
* \code
* psa_hash_operation_t operation;
* operation = psa_hash_operation_init();
* \endcode
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure except
* as directed by the documentation of a specific implementation. */
typedef struct psa_hash_operation_s psa_hash_operation_t;
/** \def PSA_HASH_OPERATION_INIT
*
* This macro returns a suitable initializer for a hash operation object
* of type #psa_hash_operation_t.
*/
#ifdef __DOXYGEN_ONLY__
/* This is an example definition for documentation purposes.
* Implementations should define a suitable value in `crypto_struct.h`.
*/
#define PSA_HASH_OPERATION_INIT {0}
#endif
/** Return an initial value for a hash operation object.
*/
static psa_hash_operation_t psa_hash_operation_init(void);
/** Set up a multipart hash operation.
*
* The sequence of operations to calculate a hash (message digest)
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_hash_operation_t, e.g. #PSA_HASH_OPERATION_INIT.
* -# Call psa_hash_setup() to specify the algorithm.
* -# Call psa_hash_update() zero, one or more times, passing a fragment
* of the message each time. The hash that is calculated is the hash
* of the concatenation of these messages in order.
* -# To calculate the hash, call psa_hash_finish().
* To compare the hash with an expected value, call psa_hash_verify().
*
* If an error occurs at any step after a call to psa_hash_setup(), the
* operation will need to be reset by a call to psa_hash_abort(). The
* application may call psa_hash_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_hash_setup(), the application must
* eventually terminate the operation. The following events terminate an
* operation:
* - A successful call to psa_hash_finish() or psa_hash_verify().
* - A call to psa_hash_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_hash_operation_t and not yet in use.
* \param alg The hash algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_HASH(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not a supported hash algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p alg is not a hash algorithm.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_setup(psa_hash_operation_t *operation,
psa_algorithm_t alg);
/** Add a message fragment to a multipart hash operation.
*
* The application must call psa_hash_setup() before calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_hash_abort().
*
* \param[in,out] operation Active hash operation.
* \param[in] input Buffer containing the message fragment to hash.
* \param input_length Size of the \p input buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it muct be active).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_update(psa_hash_operation_t *operation,
const uint8_t *input,
size_t input_length);
/** Finish the calculation of the hash of a message.
*
* The application must call psa_hash_setup() before calling this function.
* This function calculates the hash of the message formed by concatenating
* the inputs passed to preceding calls to psa_hash_update().
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_hash_abort().
*
* \warning Applications should not call this function if they expect
* a specific value for the hash. Call psa_hash_verify() instead.
* Beware that comparing integrity or authenticity data such as
* hash values with a function such as \c memcmp is risky
* because the time taken by the comparison may leak information
* about the hashed data which could allow an attacker to guess
* a valid hash and thereby bypass security controls.
*
* \param[in,out] operation Active hash operation.
* \param[out] hash Buffer where the hash is to be written.
* \param hash_size Size of the \p hash buffer in bytes.
* \param[out] hash_length On success, the number of bytes
* that make up the hash value. This is always
* #PSA_HASH_SIZE(\c alg) where \c alg is the
* hash algorithm that is calculated.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p hash buffer is too small. You can determine a
* sufficient buffer size by calling #PSA_HASH_SIZE(\c alg)
* where \c alg is the hash algorithm that is calculated.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_finish(psa_hash_operation_t *operation,
uint8_t *hash,
size_t hash_size,
size_t *hash_length);
/** Finish the calculation of the hash of a message and compare it with
* an expected value.
*
* The application must call psa_hash_setup() before calling this function.
* This function calculates the hash of the message formed by concatenating
* the inputs passed to preceding calls to psa_hash_update(). It then
* compares the calculated hash with the expected hash passed as a
* parameter to this function.
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_hash_abort().
*
* \note Implementations shall make the best effort to ensure that the
* comparison between the actual hash and the expected hash is performed
* in constant time.
*
* \param[in,out] operation Active hash operation.
* \param[in] hash Buffer containing the expected hash value.
* \param hash_length Size of the \p hash buffer in bytes.
*
* \retval #PSA_SUCCESS
* The expected hash is identical to the actual hash of the message.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The hash of the message was calculated successfully, but it
* differs from the expected hash.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_verify(psa_hash_operation_t *operation,
const uint8_t *hash,
size_t hash_length);
/** Abort a hash operation.
*
* Aborting an operation frees all associated resources except for the
* \p operation structure itself. Once aborted, the operation object
* can be reused for another operation by calling
* psa_hash_setup() again.
*
* You may call this function any time after the operation object has
* been initialized by one of the methods described in #psa_hash_operation_t.
*
* In particular, calling psa_hash_abort() after the operation has been
* terminated by a call to psa_hash_abort(), psa_hash_finish() or
* psa_hash_verify() is safe and has no effect.
*
* \param[in,out] operation Initialized hash operation.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_abort(psa_hash_operation_t *operation);
/** Clone a hash operation.
*
* This function copies the state of an ongoing hash operation to
* a new operation object. In other words, this function is equivalent
* to calling psa_hash_setup() on \p target_operation with the same
* algorithm that \p source_operation was set up for, then
* psa_hash_update() on \p target_operation with the same input that
* that was passed to \p source_operation. After this function returns, the
* two objects are independent, i.e. subsequent calls involving one of
* the objects do not affect the other object.
*
* \param[in] source_operation The active hash operation to clone.
* \param[in,out] target_operation The operation object to set up.
* It must be initialized but not active.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_BAD_STATE
* The \p source_operation state is not valid (it must be active).
* \retval #PSA_ERROR_BAD_STATE
* The \p target_operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_hash_clone(const psa_hash_operation_t *source_operation,
psa_hash_operation_t *target_operation);
/**@}*/
/** \defgroup MAC Message authentication codes
* @{
*/
/** Calculate the MAC (message authentication code) of a message.
*
* \note To verify the MAC of a message against an
* expected value, use psa_mac_verify() instead.
* Beware that comparing integrity or authenticity data such as
* MAC values with a function such as \c memcmp is risky
* because the time taken by the comparison may leak information
* about the MAC value which could allow an attacker to guess
* a valid MAC and thereby bypass security controls.
*
* \param handle Handle to the key to use for the operation.
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_MAC(\p alg) is true).
* \param[in] input Buffer containing the input message.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] mac Buffer where the MAC value is to be written.
* \param mac_size Size of the \p mac buffer in bytes.
* \param[out] mac_length On success, the number of bytes
* that make up the MAC value.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p handle is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a MAC algorithm.
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \p mac_size is too small
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* The key could not be retrieved from storage.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_compute(psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *mac,
size_t mac_size,
size_t *mac_length);
/** Calculate the MAC of a message and compare it with a reference value.
*
* \param handle Handle to the key to use for the operation.
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_MAC(\p alg) is true).
* \param[in] input Buffer containing the input message.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] mac Buffer containing the expected MAC value.
* \param mac_length Size of the \p mac buffer in bytes.
*
* \retval #PSA_SUCCESS
* The expected MAC is identical to the actual MAC of the input.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The MAC of the message was calculated successfully, but it
* differs from the expected value.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p handle is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a MAC algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* The key could not be retrieved from storage.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_verify(psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *mac,
size_t mac_length);
/** The type of the state data structure for multipart MAC operations.
*
* Before calling any function on a MAC operation object, the application must
* initialize it by any of the following means:
* - Set the structure to all-bits-zero, for example:
* \code
* psa_mac_operation_t operation;
* memset(&operation, 0, sizeof(operation));
* \endcode
* - Initialize the structure to logical zero values, for example:
* \code
* psa_mac_operation_t operation = {0};
* \endcode
* - Initialize the structure to the initializer #PSA_MAC_OPERATION_INIT,
* for example:
* \code
* psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
* \endcode
* - Assign the result of the function psa_mac_operation_init()
* to the structure, for example:
* \code
* psa_mac_operation_t operation;
* operation = psa_mac_operation_init();
* \endcode
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure except
* as directed by the documentation of a specific implementation. */
typedef struct psa_mac_operation_s psa_mac_operation_t;
/** \def PSA_MAC_OPERATION_INIT
*
* This macro returns a suitable initializer for a MAC operation object of type
* #psa_mac_operation_t.
*/
#ifdef __DOXYGEN_ONLY__
/* This is an example definition for documentation purposes.
* Implementations should define a suitable value in `crypto_struct.h`.
*/
#define PSA_MAC_OPERATION_INIT {0}
#endif
/** Return an initial value for a MAC operation object.
*/
static psa_mac_operation_t psa_mac_operation_init(void);
/** Set up a multipart MAC calculation operation.
*
* This function sets up the calculation of the MAC
* (message authentication code) of a byte string.
* To verify the MAC of a message against an
* expected value, use psa_mac_verify_setup() instead.
*
* The sequence of operations to calculate a MAC is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_mac_operation_t, e.g. #PSA_MAC_OPERATION_INIT.
* -# Call psa_mac_sign_setup() to specify the algorithm and key.
* -# Call psa_mac_update() zero, one or more times, passing a fragment
* of the message each time. The MAC that is calculated is the MAC
* of the concatenation of these messages in order.
* -# At the end of the message, call psa_mac_sign_finish() to finish
* calculating the MAC value and retrieve it.
*
* If an error occurs at any step after a call to psa_mac_sign_setup(), the
* operation will need to be reset by a call to psa_mac_abort(). The
* application may call psa_mac_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_mac_sign_setup(), the application must
* eventually terminate the operation through one of the following methods:
* - A successful call to psa_mac_sign_finish().
* - A call to psa_mac_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_mac_operation_t and not yet in use.
* \param handle Handle to the key to use for the operation.
* It must remain valid until the operation
* terminates.
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_MAC(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p handle is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a MAC algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* The key could not be retrieved from storage.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_sign_setup(psa_mac_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg);
/** Set up a multipart MAC verification operation.
*
* This function sets up the verification of the MAC
* (message authentication code) of a byte string against an expected value.
*
* The sequence of operations to verify a MAC is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_mac_operation_t, e.g. #PSA_MAC_OPERATION_INIT.
* -# Call psa_mac_verify_setup() to specify the algorithm and key.
* -# Call psa_mac_update() zero, one or more times, passing a fragment
* of the message each time. The MAC that is calculated is the MAC
* of the concatenation of these messages in order.
* -# At the end of the message, call psa_mac_verify_finish() to finish
* calculating the actual MAC of the message and verify it against
* the expected value.
*
* If an error occurs at any step after a call to psa_mac_verify_setup(), the
* operation will need to be reset by a call to psa_mac_abort(). The
* application may call psa_mac_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_mac_verify_setup(), the application must
* eventually terminate the operation through one of the following methods:
* - A successful call to psa_mac_verify_finish().
* - A call to psa_mac_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_mac_operation_t and not yet in use.
* \param handle Handle to the key to use for the operation.
* It must remain valid until the operation
* terminates.
* \param alg The MAC algorithm to compute (\c PSA_ALG_XXX value
* such that #PSA_ALG_IS_MAC(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c key is not compatible with \c alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not a MAC algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* The key could not be retrieved from storage
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_verify_setup(psa_mac_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg);
/** Add a message fragment to a multipart MAC operation.
*
* The application must call psa_mac_sign_setup() or psa_mac_verify_setup()
* before calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_mac_abort().
*
* \param[in,out] operation Active MAC operation.
* \param[in] input Buffer containing the message fragment to add to
* the MAC calculation.
* \param input_length Size of the \p input buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_update(psa_mac_operation_t *operation,
const uint8_t *input,
size_t input_length);
/** Finish the calculation of the MAC of a message.
*
* The application must call psa_mac_sign_setup() before calling this function.
* This function calculates the MAC of the message formed by concatenating
* the inputs passed to preceding calls to psa_mac_update().
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_mac_abort().
*
* \warning Applications should not call this function if they expect
* a specific value for the MAC. Call psa_mac_verify_finish() instead.
* Beware that comparing integrity or authenticity data such as
* MAC values with a function such as \c memcmp is risky
* because the time taken by the comparison may leak information
* about the MAC value which could allow an attacker to guess
* a valid MAC and thereby bypass security controls.
*
* \param[in,out] operation Active MAC operation.
* \param[out] mac Buffer where the MAC value is to be written.
* \param mac_size Size of the \p mac buffer in bytes.
* \param[out] mac_length On success, the number of bytes
* that make up the MAC value. This is always
* #PSA_MAC_FINAL_SIZE(\c key_type, \c key_bits, \c alg)
* where \c key_type and \c key_bits are the type and
* bit-size respectively of the key and \c alg is the
* MAC algorithm that is calculated.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active mac sign
* operation).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p mac buffer is too small. You can determine a
* sufficient buffer size by calling PSA_MAC_FINAL_SIZE().
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_sign_finish(psa_mac_operation_t *operation,
uint8_t *mac,
size_t mac_size,
size_t *mac_length);
/** Finish the calculation of the MAC of a message and compare it with
* an expected value.
*
* The application must call psa_mac_verify_setup() before calling this function.
* This function calculates the MAC of the message formed by concatenating
* the inputs passed to preceding calls to psa_mac_update(). It then
* compares the calculated MAC with the expected MAC passed as a
* parameter to this function.
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_mac_abort().
*
* \note Implementations shall make the best effort to ensure that the
* comparison between the actual MAC and the expected MAC is performed
* in constant time.
*
* \param[in,out] operation Active MAC operation.
* \param[in] mac Buffer containing the expected MAC value.
* \param mac_length Size of the \p mac buffer in bytes.
*
* \retval #PSA_SUCCESS
* The expected MAC is identical to the actual MAC of the message.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The MAC of the message was calculated successfully, but it
* differs from the expected MAC.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active mac verify
* operation).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_verify_finish(psa_mac_operation_t *operation,
const uint8_t *mac,
size_t mac_length);
/** Abort a MAC operation.
*
* Aborting an operation frees all associated resources except for the
* \p operation structure itself. Once aborted, the operation object
* can be reused for another operation by calling
* psa_mac_sign_setup() or psa_mac_verify_setup() again.
*
* You may call this function any time after the operation object has
* been initialized by one of the methods described in #psa_mac_operation_t.
*
* In particular, calling psa_mac_abort() after the operation has been
* terminated by a call to psa_mac_abort(), psa_mac_sign_finish() or
* psa_mac_verify_finish() is safe and has no effect.
*
* \param[in,out] operation Initialized MAC operation.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_mac_abort(psa_mac_operation_t *operation);
/**@}*/
/** \defgroup cipher Symmetric ciphers
* @{
*/
/** Encrypt a message using a symmetric cipher.
*
* This function encrypts a message with a random IV (initialization
* vector). Use the multipart operation interface with a
* #psa_cipher_operation_t object to provide other forms of IV.
*
* \param handle Handle to the key to use for the operation.
* It must remain valid until the operation
* terminates.
* \param alg The cipher algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
* \param[in] input Buffer containing the message to encrypt.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] output Buffer where the output is to be written.
* The output contains the IV followed by
* the ciphertext proper.
* \param output_size Size of the \p output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p handle is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a cipher algorithm.
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_encrypt(psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/** Decrypt a message using a symmetric cipher.
*
* This function decrypts a message encrypted with a symmetric cipher.
*
* \param handle Handle to the key to use for the operation.
* It must remain valid until the operation
* terminates.
* \param alg The cipher algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
* \param[in] input Buffer containing the message to decrypt.
* This consists of the IV followed by the
* ciphertext proper.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] output Buffer where the plaintext is to be written.
* \param output_size Size of the \p output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p handle is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a cipher algorithm.
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_decrypt(psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/** The type of the state data structure for multipart cipher operations.
*
* Before calling any function on a cipher operation object, the application
* must initialize it by any of the following means:
* - Set the structure to all-bits-zero, for example:
* \code
* psa_cipher_operation_t operation;
* memset(&operation, 0, sizeof(operation));
* \endcode
* - Initialize the structure to logical zero values, for example:
* \code
* psa_cipher_operation_t operation = {0};
* \endcode
* - Initialize the structure to the initializer #PSA_CIPHER_OPERATION_INIT,
* for example:
* \code
* psa_cipher_operation_t operation = PSA_CIPHER_OPERATION_INIT;
* \endcode
* - Assign the result of the function psa_cipher_operation_init()
* to the structure, for example:
* \code
* psa_cipher_operation_t operation;
* operation = psa_cipher_operation_init();
* \endcode
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure except
* as directed by the documentation of a specific implementation. */
typedef struct psa_cipher_operation_s psa_cipher_operation_t;
/** \def PSA_CIPHER_OPERATION_INIT
*
* This macro returns a suitable initializer for a cipher operation object of
* type #psa_cipher_operation_t.
*/
#ifdef __DOXYGEN_ONLY__
/* This is an example definition for documentation purposes.
* Implementations should define a suitable value in `crypto_struct.h`.
*/
#define PSA_CIPHER_OPERATION_INIT {0}
#endif
/** Return an initial value for a cipher operation object.
*/
static psa_cipher_operation_t psa_cipher_operation_init(void);
/** Set the key for a multipart symmetric encryption operation.
*
* The sequence of operations to encrypt a message with a symmetric cipher
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_cipher_operation_t, e.g.
* #PSA_CIPHER_OPERATION_INIT.
* -# Call psa_cipher_encrypt_setup() to specify the algorithm and key.
* -# Call either psa_cipher_generate_iv() or psa_cipher_set_iv() to
* generate or set the IV (initialization vector). You should use
* psa_cipher_generate_iv() unless the protocol you are implementing
* requires a specific IV value.
* -# Call psa_cipher_update() zero, one or more times, passing a fragment
* of the message each time.
* -# Call psa_cipher_finish().
*
* If an error occurs at any step after a call to psa_cipher_encrypt_setup(),
* the operation will need to be reset by a call to psa_cipher_abort(). The
* application may call psa_cipher_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_cipher_encrypt_setup(), the application must
* eventually terminate the operation. The following events terminate an
* operation:
* - A successful call to psa_cipher_finish().
* - A call to psa_cipher_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_cipher_operation_t and not yet in use.
* \param handle Handle to the key to use for the operation.
* It must remain valid until the operation
* terminates.
* \param alg The cipher algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p handle is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a cipher algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_encrypt_setup(psa_cipher_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg);
/** Set the key for a multipart symmetric decryption operation.
*
* The sequence of operations to decrypt a message with a symmetric cipher
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_cipher_operation_t, e.g.
* #PSA_CIPHER_OPERATION_INIT.
* -# Call psa_cipher_decrypt_setup() to specify the algorithm and key.
* -# Call psa_cipher_set_iv() with the IV (initialization vector) for the
* decryption. If the IV is prepended to the ciphertext, you can call
* psa_cipher_update() on a buffer containing the IV followed by the
* beginning of the message.
* -# Call psa_cipher_update() zero, one or more times, passing a fragment
* of the message each time.
* -# Call psa_cipher_finish().
*
* If an error occurs at any step after a call to psa_cipher_decrypt_setup(),
* the operation will need to be reset by a call to psa_cipher_abort(). The
* application may call psa_cipher_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_cipher_decrypt_setup(), the application must
* eventually terminate the operation. The following events terminate an
* operation:
* - A successful call to psa_cipher_finish().
* - A call to psa_cipher_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_cipher_operation_t and not yet in use.
* \param handle Handle to the key to use for the operation.
* It must remain valid until the operation
* terminates.
* \param alg The cipher algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_CIPHER(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p handle is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not a cipher algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_decrypt_setup(psa_cipher_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg);
/** Generate an IV for a symmetric encryption operation.
*
* This function generates a random IV (initialization vector), nonce
* or initial counter value for the encryption operation as appropriate
* for the chosen algorithm, key type and key size.
*
* The application must call psa_cipher_encrypt_setup() before
* calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_cipher_abort().
*
* \param[in,out] operation Active cipher operation.
* \param[out] iv Buffer where the generated IV is to be written.
* \param iv_size Size of the \p iv buffer in bytes.
* \param[out] iv_length On success, the number of bytes of the
* generated IV.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, with no IV set).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p iv buffer is too small.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_generate_iv(psa_cipher_operation_t *operation,
uint8_t *iv,
size_t iv_size,
size_t *iv_length);
/** Set the IV for a symmetric encryption or decryption operation.
*
* This function sets the IV (initialization vector), nonce
* or initial counter value for the encryption or decryption operation.
*
* The application must call psa_cipher_encrypt_setup() before
* calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_cipher_abort().
*
* \note When encrypting, applications should use psa_cipher_generate_iv()
* instead of this function, unless implementing a protocol that requires
* a non-random IV.
*
* \param[in,out] operation Active cipher operation.
* \param[in] iv Buffer containing the IV to use.
* \param iv_length Size of the IV in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active cipher
* encrypt operation, with no IV set).
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The size of \p iv is not acceptable for the chosen algorithm,
* or the chosen algorithm does not use an IV.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_set_iv(psa_cipher_operation_t *operation,
const uint8_t *iv,
size_t iv_length);
/** Encrypt or decrypt a message fragment in an active cipher operation.
*
* Before calling this function, you must:
* 1. Call either psa_cipher_encrypt_setup() or psa_cipher_decrypt_setup().
* The choice of setup function determines whether this function
* encrypts or decrypts its input.
* 2. If the algorithm requires an IV, call psa_cipher_generate_iv()
* (recommended when encrypting) or psa_cipher_set_iv().
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_cipher_abort().
*
* \param[in,out] operation Active cipher operation.
* \param[in] input Buffer containing the message fragment to
* encrypt or decrypt.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] output Buffer where the output is to be written.
* \param output_size Size of the \p output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, with an IV set
* if required for the algorithm).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p output buffer is too small.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_update(psa_cipher_operation_t *operation,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/** Finish encrypting or decrypting a message in a cipher operation.
*
* The application must call psa_cipher_encrypt_setup() or
* psa_cipher_decrypt_setup() before calling this function. The choice
* of setup function determines whether this function encrypts or
* decrypts its input.
*
* This function finishes the encryption or decryption of the message
* formed by concatenating the inputs passed to preceding calls to
* psa_cipher_update().
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_cipher_abort().
*
* \param[in,out] operation Active cipher operation.
* \param[out] output Buffer where the output is to be written.
* \param output_size Size of the \p output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total input size passed to this operation is not valid for
* this particular algorithm. For example, the algorithm is a based
* on block cipher and requires a whole number of blocks, but the
* total input size is not a multiple of the block size.
* \retval #PSA_ERROR_INVALID_PADDING
* This is a decryption operation for an algorithm that includes
* padding, and the ciphertext does not contain valid padding.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, with an IV set
* if required for the algorithm).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p output buffer is too small.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_finish(psa_cipher_operation_t *operation,
uint8_t *output,
size_t output_size,
size_t *output_length);
/** Abort a cipher operation.
*
* Aborting an operation frees all associated resources except for the
* \p operation structure itself. Once aborted, the operation object
* can be reused for another operation by calling
* psa_cipher_encrypt_setup() or psa_cipher_decrypt_setup() again.
*
* You may call this function any time after the operation object has
* been initialized as described in #psa_cipher_operation_t.
*
* In particular, calling psa_cipher_abort() after the operation has been
* terminated by a call to psa_cipher_abort() or psa_cipher_finish()
* is safe and has no effect.
*
* \param[in,out] operation Initialized cipher operation.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_cipher_abort(psa_cipher_operation_t *operation);
/**@}*/
/** \defgroup aead Authenticated encryption with associated data (AEAD)
* @{
*/
/** Process an authenticated encryption operation.
*
* \param handle Handle to the key to use for the operation.
* \param alg The AEAD algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_AEAD(\p alg) is true).
* \param[in] nonce Nonce or IV to use.
* \param nonce_length Size of the \p nonce buffer in bytes.
* \param[in] additional_data Additional data that will be authenticated
* but not encrypted.
* \param additional_data_length Size of \p additional_data in bytes.
* \param[in] plaintext Data that will be authenticated and
* encrypted.
* \param plaintext_length Size of \p plaintext in bytes.
* \param[out] ciphertext Output buffer for the authenticated and
* encrypted data. The additional data is not
* part of this output. For algorithms where the
* encrypted data and the authentication tag
* are defined as separate outputs, the
* authentication tag is appended to the
* encrypted data.
* \param ciphertext_size Size of the \p ciphertext buffer in bytes.
* This must be at least
* #PSA_AEAD_ENCRYPT_OUTPUT_SIZE(\p alg,
* \p plaintext_length).
* \param[out] ciphertext_length On success, the size of the output
* in the \p ciphertext buffer.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p handle is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not an AEAD algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \p ciphertext_size is too small
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_encrypt(psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *nonce,
size_t nonce_length,
const uint8_t *additional_data,
size_t additional_data_length,
const uint8_t *plaintext,
size_t plaintext_length,
uint8_t *ciphertext,
size_t ciphertext_size,
size_t *ciphertext_length);
/** Process an authenticated decryption operation.
*
* \param handle Handle to the key to use for the operation.
* \param alg The AEAD algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_AEAD(\p alg) is true).
* \param[in] nonce Nonce or IV to use.
* \param nonce_length Size of the \p nonce buffer in bytes.
* \param[in] additional_data Additional data that has been authenticated
* but not encrypted.
* \param additional_data_length Size of \p additional_data in bytes.
* \param[in] ciphertext Data that has been authenticated and
* encrypted. For algorithms where the
* encrypted data and the authentication tag
* are defined as separate inputs, the buffer
* must contain the encrypted data followed
* by the authentication tag.
* \param ciphertext_length Size of \p ciphertext in bytes.
* \param[out] plaintext Output buffer for the decrypted data.
* \param plaintext_size Size of the \p plaintext buffer in bytes.
* This must be at least
* #PSA_AEAD_DECRYPT_OUTPUT_SIZE(\p alg,
* \p ciphertext_length).
* \param[out] plaintext_length On success, the size of the output
* in the \p plaintext buffer.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The ciphertext is not authentic.
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p handle is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not an AEAD algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \p plaintext_size or \p nonce_length is too small
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_decrypt(psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *nonce,
size_t nonce_length,
const uint8_t *additional_data,
size_t additional_data_length,
const uint8_t *ciphertext,
size_t ciphertext_length,
uint8_t *plaintext,
size_t plaintext_size,
size_t *plaintext_length);
/** The type of the state data structure for multipart AEAD operations.
*
* Before calling any function on an AEAD operation object, the application
* must initialize it by any of the following means:
* - Set the structure to all-bits-zero, for example:
* \code
* psa_aead_operation_t operation;
* memset(&operation, 0, sizeof(operation));
* \endcode
* - Initialize the structure to logical zero values, for example:
* \code
* psa_aead_operation_t operation = {0};
* \endcode
* - Initialize the structure to the initializer #PSA_AEAD_OPERATION_INIT,
* for example:
* \code
* psa_aead_operation_t operation = PSA_AEAD_OPERATION_INIT;
* \endcode
* - Assign the result of the function psa_aead_operation_init()
* to the structure, for example:
* \code
* psa_aead_operation_t operation;
* operation = psa_aead_operation_init();
* \endcode
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure except
* as directed by the documentation of a specific implementation. */
typedef struct psa_aead_operation_s psa_aead_operation_t;
/** \def PSA_AEAD_OPERATION_INIT
*
* This macro returns a suitable initializer for an AEAD operation object of
* type #psa_aead_operation_t.
*/
#ifdef __DOXYGEN_ONLY__
/* This is an example definition for documentation purposes.
* Implementations should define a suitable value in `crypto_struct.h`.
*/
#define PSA_AEAD_OPERATION_INIT {0}
#endif
/** Return an initial value for an AEAD operation object.
*/
static psa_aead_operation_t psa_aead_operation_init(void);
/** Set the key for a multipart authenticated encryption operation.
*
* The sequence of operations to encrypt a message with authentication
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_aead_operation_t, e.g.
* #PSA_AEAD_OPERATION_INIT.
* -# Call psa_aead_encrypt_setup() to specify the algorithm and key.
* -# If needed, call psa_aead_set_lengths() to specify the length of the
* inputs to the subsequent calls to psa_aead_update_ad() and
* psa_aead_update(). See the documentation of psa_aead_set_lengths()
* for details.
* -# Call either psa_aead_generate_nonce() or psa_aead_set_nonce() to
* generate or set the nonce. You should use
* psa_aead_generate_nonce() unless the protocol you are implementing
* requires a specific nonce value.
* -# Call psa_aead_update_ad() zero, one or more times, passing a fragment
* of the non-encrypted additional authenticated data each time.
* -# Call psa_aead_update() zero, one or more times, passing a fragment
* of the message to encrypt each time.
* -# Call psa_aead_finish().
*
* If an error occurs at any step after a call to psa_aead_encrypt_setup(),
* the operation will need to be reset by a call to psa_aead_abort(). The
* application may call psa_aead_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_aead_encrypt_setup(), the application must
* eventually terminate the operation. The following events terminate an
* operation:
* - A successful call to psa_aead_finish().
* - A call to psa_aead_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_aead_operation_t and not yet in use.
* \param handle Handle to the key to use for the operation.
* It must remain valid until the operation
* terminates.
* \param alg The AEAD algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_AEAD(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p handle is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not an AEAD algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_encrypt_setup(psa_aead_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg);
/** Set the key for a multipart authenticated decryption operation.
*
* The sequence of operations to decrypt a message with authentication
* is as follows:
* -# Allocate an operation object which will be passed to all the functions
* listed here.
* -# Initialize the operation object with one of the methods described in the
* documentation for #psa_aead_operation_t, e.g.
* #PSA_AEAD_OPERATION_INIT.
* -# Call psa_aead_decrypt_setup() to specify the algorithm and key.
* -# If needed, call psa_aead_set_lengths() to specify the length of the
* inputs to the subsequent calls to psa_aead_update_ad() and
* psa_aead_update(). See the documentation of psa_aead_set_lengths()
* for details.
* -# Call psa_aead_set_nonce() with the nonce for the decryption.
* -# Call psa_aead_update_ad() zero, one or more times, passing a fragment
* of the non-encrypted additional authenticated data each time.
* -# Call psa_aead_update() zero, one or more times, passing a fragment
* of the ciphertext to decrypt each time.
* -# Call psa_aead_verify().
*
* If an error occurs at any step after a call to psa_aead_decrypt_setup(),
* the operation will need to be reset by a call to psa_aead_abort(). The
* application may call psa_aead_abort() at any time after the operation
* has been initialized.
*
* After a successful call to psa_aead_decrypt_setup(), the application must
* eventually terminate the operation. The following events terminate an
* operation:
* - A successful call to psa_aead_verify().
* - A call to psa_aead_abort().
*
* \param[in,out] operation The operation object to set up. It must have
* been initialized as per the documentation for
* #psa_aead_operation_t and not yet in use.
* \param handle Handle to the key to use for the operation.
* It must remain valid until the operation
* terminates.
* \param alg The AEAD algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_AEAD(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p handle is not compatible with \p alg.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not supported or is not an AEAD algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_decrypt_setup(psa_aead_operation_t *operation,
psa_key_handle_t handle,
psa_algorithm_t alg);
/** Generate a random nonce for an authenticated encryption operation.
*
* This function generates a random nonce for the authenticated encryption
* operation with an appropriate size for the chosen algorithm, key type
* and key size.
*
* The application must call psa_aead_encrypt_setup() before
* calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \param[in,out] operation Active AEAD operation.
* \param[out] nonce Buffer where the generated nonce is to be
* written.
* \param nonce_size Size of the \p nonce buffer in bytes.
* \param[out] nonce_length On success, the number of bytes of the
* generated nonce.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active aead encrypt
operation, with no nonce set).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p nonce buffer is too small.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_generate_nonce(psa_aead_operation_t *operation,
uint8_t *nonce,
size_t nonce_size,
size_t *nonce_length);
/** Set the nonce for an authenticated encryption or decryption operation.
*
* This function sets the nonce for the authenticated
* encryption or decryption operation.
*
* The application must call psa_aead_encrypt_setup() or
* psa_aead_decrypt_setup() before calling this function.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \note When encrypting, applications should use psa_aead_generate_nonce()
* instead of this function, unless implementing a protocol that requires
* a non-random IV.
*
* \param[in,out] operation Active AEAD operation.
* \param[in] nonce Buffer containing the nonce to use.
* \param nonce_length Size of the nonce in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, with no nonce
* set).
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The size of \p nonce is not acceptable for the chosen algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_set_nonce(psa_aead_operation_t *operation,
const uint8_t *nonce,
size_t nonce_length);
/** Declare the lengths of the message and additional data for AEAD.
*
* The application must call this function before calling
* psa_aead_update_ad() or psa_aead_update() if the algorithm for
* the operation requires it. If the algorithm does not require it,
* calling this function is optional, but if this function is called
* then the implementation must enforce the lengths.
*
* You may call this function before or after setting the nonce with
* psa_aead_set_nonce() or psa_aead_generate_nonce().
*
* - For #PSA_ALG_CCM, calling this function is required.
* - For the other AEAD algorithms defined in this specification, calling
* this function is not required.
* - For vendor-defined algorithm, refer to the vendor documentation.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \param[in,out] operation Active AEAD operation.
* \param ad_length Size of the non-encrypted additional
* authenticated data in bytes.
* \param plaintext_length Size of the plaintext to encrypt in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, and
* psa_aead_update_ad() and psa_aead_update() must not have been
* called yet).
* \retval #PSA_ERROR_INVALID_ARGUMENT
* At least one of the lengths is not acceptable for the chosen
* algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_set_lengths(psa_aead_operation_t *operation,
size_t ad_length,
size_t plaintext_length);
/** Pass additional data to an active AEAD operation.
*
* Additional data is authenticated, but not encrypted.
*
* You may call this function multiple times to pass successive fragments
* of the additional data. You may not call this function after passing
* data to encrypt or decrypt with psa_aead_update().
*
* Before calling this function, you must:
* 1. Call either psa_aead_encrypt_setup() or psa_aead_decrypt_setup().
* 2. Set the nonce with psa_aead_generate_nonce() or psa_aead_set_nonce().
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \warning When decrypting, until psa_aead_verify() has returned #PSA_SUCCESS,
* there is no guarantee that the input is valid. Therefore, until
* you have called psa_aead_verify() and it has returned #PSA_SUCCESS,
* treat the input as untrusted and prepare to undo any action that
* depends on the input if psa_aead_verify() returns an error status.
*
* \param[in,out] operation Active AEAD operation.
* \param[in] input Buffer containing the fragment of
* additional data.
* \param input_length Size of the \p input buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, have a nonce
* set, have lengths set if required by the algorithm, and
* psa_aead_update() must not have been called yet).
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total input length overflows the additional data length that
* was previously specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_update_ad(psa_aead_operation_t *operation,
const uint8_t *input,
size_t input_length);
/** Encrypt or decrypt a message fragment in an active AEAD operation.
*
* Before calling this function, you must:
* 1. Call either psa_aead_encrypt_setup() or psa_aead_decrypt_setup().
* The choice of setup function determines whether this function
* encrypts or decrypts its input.
* 2. Set the nonce with psa_aead_generate_nonce() or psa_aead_set_nonce().
* 3. Call psa_aead_update_ad() to pass all the additional data.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \warning When decrypting, until psa_aead_verify() has returned #PSA_SUCCESS,
* there is no guarantee that the input is valid. Therefore, until
* you have called psa_aead_verify() and it has returned #PSA_SUCCESS:
* - Do not use the output in any way other than storing it in a
* confidential location. If you take any action that depends
* on the tentative decrypted data, this action will need to be
* undone if the input turns out not to be valid. Furthermore,
* if an adversary can observe that this action took place
* (for example through timing), they may be able to use this
* fact as an oracle to decrypt any message encrypted with the
* same key.
* - In particular, do not copy the output anywhere but to a
* memory or storage space that you have exclusive access to.
*
* This function does not require the input to be aligned to any
* particular block boundary. If the implementation can only process
* a whole block at a time, it must consume all the input provided, but
* it may delay the end of the corresponding output until a subsequent
* call to psa_aead_update(), psa_aead_finish() or psa_aead_verify()
* provides sufficient input. The amount of data that can be delayed
* in this way is bounded by #PSA_AEAD_UPDATE_OUTPUT_SIZE.
*
* \param[in,out] operation Active AEAD operation.
* \param[in] input Buffer containing the message fragment to
* encrypt or decrypt.
* \param input_length Size of the \p input buffer in bytes.
* \param[out] output Buffer where the output is to be written.
* \param output_size Size of the \p output buffer in bytes.
* This must be at least
* #PSA_AEAD_UPDATE_OUTPUT_SIZE(\c alg,
* \p input_length) where \c alg is the
* algorithm that is being calculated.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active, have a nonce
* set, and have lengths set if required by the algorithm).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p output buffer is too small.
* You can determine a sufficient buffer size by calling
* #PSA_AEAD_UPDATE_OUTPUT_SIZE(\c alg, \p input_length)
* where \c alg is the algorithm that is being calculated.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total length of input to psa_aead_update_ad() so far is
* less than the additional data length that was previously
* specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total input length overflows the plaintext length that
* was previously specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_update(psa_aead_operation_t *operation,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/** Finish encrypting a message in an AEAD operation.
*
* The operation must have been set up with psa_aead_encrypt_setup().
*
* This function finishes the authentication of the additional data
* formed by concatenating the inputs passed to preceding calls to
* psa_aead_update_ad() with the plaintext formed by concatenating the
* inputs passed to preceding calls to psa_aead_update().
*
* This function has two output buffers:
* - \p ciphertext contains trailing ciphertext that was buffered from
* preceding calls to psa_aead_update().
* - \p tag contains the authentication tag. Its length is always
* #PSA_AEAD_TAG_LENGTH(\c alg) where \c alg is the AEAD algorithm
* that the operation performs.
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \param[in,out] operation Active AEAD operation.
* \param[out] ciphertext Buffer where the last part of the ciphertext
* is to be written.
* \param ciphertext_size Size of the \p ciphertext buffer in bytes.
* This must be at least
* #PSA_AEAD_FINISH_OUTPUT_SIZE(\c alg) where
* \c alg is the algorithm that is being
* calculated.
* \param[out] ciphertext_length On success, the number of bytes of
* returned ciphertext.
* \param[out] tag Buffer where the authentication tag is
* to be written.
* \param tag_size Size of the \p tag buffer in bytes.
* This must be at least
* #PSA_AEAD_TAG_LENGTH(\c alg) where \c alg is
* the algorithm that is being calculated.
* \param[out] tag_length On success, the number of bytes
* that make up the returned tag.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active encryption
* operation with a nonce set).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p ciphertext or \p tag buffer is too small.
* You can determine a sufficient buffer size for \p ciphertext by
* calling #PSA_AEAD_FINISH_OUTPUT_SIZE(\c alg)
* where \c alg is the algorithm that is being calculated.
* You can determine a sufficient buffer size for \p tag by
* calling #PSA_AEAD_TAG_LENGTH(\c alg).
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total length of input to psa_aead_update_ad() so far is
* less than the additional data length that was previously
* specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total length of input to psa_aead_update() so far is
* less than the plaintext length that was previously
* specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_finish(psa_aead_operation_t *operation,
uint8_t *ciphertext,
size_t ciphertext_size,
size_t *ciphertext_length,
uint8_t *tag,
size_t tag_size,
size_t *tag_length);
/** Finish authenticating and decrypting a message in an AEAD operation.
*
* The operation must have been set up with psa_aead_decrypt_setup().
*
* This function finishes the authenticated decryption of the message
* components:
*
* - The additional data consisting of the concatenation of the inputs
* passed to preceding calls to psa_aead_update_ad().
* - The ciphertext consisting of the concatenation of the inputs passed to
* preceding calls to psa_aead_update().
* - The tag passed to this function call.
*
* If the authentication tag is correct, this function outputs any remaining
* plaintext and reports success. If the authentication tag is not correct,
* this function returns #PSA_ERROR_INVALID_SIGNATURE.
*
* When this function returns successfuly, the operation becomes inactive.
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_aead_abort().
*
* \note Implementations shall make the best effort to ensure that the
* comparison between the actual tag and the expected tag is performed
* in constant time.
*
* \param[in,out] operation Active AEAD operation.
* \param[out] plaintext Buffer where the last part of the plaintext
* is to be written. This is the remaining data
* from previous calls to psa_aead_update()
* that could not be processed until the end
* of the input.
* \param plaintext_size Size of the \p plaintext buffer in bytes.
* This must be at least
* #PSA_AEAD_VERIFY_OUTPUT_SIZE(\c alg) where
* \c alg is the algorithm that is being
* calculated.
* \param[out] plaintext_length On success, the number of bytes of
* returned plaintext.
* \param[in] tag Buffer containing the authentication tag.
* \param tag_length Size of the \p tag buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The calculations were successful, but the authentication tag is
* not correct.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be an active decryption
* operation with a nonce set).
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p plaintext buffer is too small.
* You can determine a sufficient buffer size for \p plaintext by
* calling #PSA_AEAD_VERIFY_OUTPUT_SIZE(\c alg)
* where \c alg is the algorithm that is being calculated.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total length of input to psa_aead_update_ad() so far is
* less than the additional data length that was previously
* specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The total length of input to psa_aead_update() so far is
* less than the plaintext length that was previously
* specified with psa_aead_set_lengths().
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_verify(psa_aead_operation_t *operation,
uint8_t *plaintext,
size_t plaintext_size,
size_t *plaintext_length,
const uint8_t *tag,
size_t tag_length);
/** Abort an AEAD operation.
*
* Aborting an operation frees all associated resources except for the
* \p operation structure itself. Once aborted, the operation object
* can be reused for another operation by calling
* psa_aead_encrypt_setup() or psa_aead_decrypt_setup() again.
*
* You may call this function any time after the operation object has
* been initialized as described in #psa_aead_operation_t.
*
* In particular, calling psa_aead_abort() after the operation has been
* terminated by a call to psa_aead_abort(), psa_aead_finish() or
* psa_aead_verify() is safe and has no effect.
*
* \param[in,out] operation Initialized AEAD operation.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_aead_abort(psa_aead_operation_t *operation);
/**@}*/
/** \defgroup asymmetric Asymmetric cryptography
* @{
*/
/**
* \brief Sign a hash or short message with a private key.
*
* Note that to perform a hash-and-sign signature algorithm, you must
* first calculate the hash by calling psa_hash_setup(), psa_hash_update()
* and psa_hash_finish(). Then pass the resulting hash as the \p hash
* parameter to this function. You can use #PSA_ALG_SIGN_GET_HASH(\p alg)
* to determine the hash algorithm to use.
*
* \param handle Handle to the key to use for the operation.
* It must be an asymmetric key pair.
* \param alg A signature algorithm that is compatible with
* the type of \p handle.
* \param[in] hash The hash or message to sign.
* \param hash_length Size of the \p hash buffer in bytes.
* \param[out] signature Buffer where the signature is to be written.
* \param signature_size Size of the \p signature buffer in bytes.
* \param[out] signature_length On success, the number of bytes
* that make up the returned signature value.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p signature buffer is too small. You can
* determine a sufficient buffer size by calling
* #PSA_SIGN_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
* where \c key_type and \c key_bits are the type and bit-size
* respectively of \p handle.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_sign_hash(psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
uint8_t *signature,
size_t signature_size,
size_t *signature_length);
/**
* \brief Verify the signature a hash or short message using a public key.
*
* Note that to perform a hash-and-sign signature algorithm, you must
* first calculate the hash by calling psa_hash_setup(), psa_hash_update()
* and psa_hash_finish(). Then pass the resulting hash as the \p hash
* parameter to this function. You can use #PSA_ALG_SIGN_GET_HASH(\p alg)
* to determine the hash algorithm to use.
*
* \param handle Handle to the key to use for the operation.
* It must be a public key or an asymmetric key pair.
* \param alg A signature algorithm that is compatible with
* the type of \p handle.
* \param[in] hash The hash or message whose signature is to be
* verified.
* \param hash_length Size of the \p hash buffer in bytes.
* \param[in] signature Buffer containing the signature to verify.
* \param signature_length Size of the \p signature buffer in bytes.
*
* \retval #PSA_SUCCESS
* The signature is valid.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_SIGNATURE
* The calculation was perfomed successfully, but the passed
* signature is not a valid signature.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_verify_hash(psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *hash,
size_t hash_length,
const uint8_t *signature,
size_t signature_length);
/**
* \brief Encrypt a short message with a public key.
*
* \param handle Handle to the key to use for the operation.
* It must be a public key or an asymmetric
* key pair.
* \param alg An asymmetric encryption algorithm that is
* compatible with the type of \p handle.
* \param[in] input The message to encrypt.
* \param input_length Size of the \p input buffer in bytes.
* \param[in] salt A salt or label, if supported by the
* encryption algorithm.
* If the algorithm does not support a
* salt, pass \c NULL.
* If the algorithm supports an optional
* salt and you do not want to pass a salt,
* pass \c NULL.
*
* - For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
* supported.
* \param salt_length Size of the \p salt buffer in bytes.
* If \p salt is \c NULL, pass 0.
* \param[out] output Buffer where the encrypted message is to
* be written.
* \param output_size Size of the \p output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p output buffer is too small. You can
* determine a sufficient buffer size by calling
* #PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
* where \c key_type and \c key_bits are the type and bit-size
* respectively of \p handle.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_asymmetric_encrypt(psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *salt,
size_t salt_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/**
* \brief Decrypt a short message with a private key.
*
* \param handle Handle to the key to use for the operation.
* It must be an asymmetric key pair.
* \param alg An asymmetric encryption algorithm that is
* compatible with the type of \p handle.
* \param[in] input The message to decrypt.
* \param input_length Size of the \p input buffer in bytes.
* \param[in] salt A salt or label, if supported by the
* encryption algorithm.
* If the algorithm does not support a
* salt, pass \c NULL.
* If the algorithm supports an optional
* salt and you do not want to pass a salt,
* pass \c NULL.
*
* - For #PSA_ALG_RSA_PKCS1V15_CRYPT, no salt is
* supported.
* \param salt_length Size of the \p salt buffer in bytes.
* If \p salt is \c NULL, pass 0.
* \param[out] output Buffer where the decrypted message is to
* be written.
* \param output_size Size of the \c output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* The size of the \p output buffer is too small. You can
* determine a sufficient buffer size by calling
* #PSA_ASYMMETRIC_DECRYPT_OUTPUT_SIZE(\c key_type, \c key_bits, \p alg)
* where \c key_type and \c key_bits are the type and bit-size
* respectively of \p handle.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_INVALID_PADDING
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_asymmetric_decrypt(psa_key_handle_t handle,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *salt,
size_t salt_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/**@}*/
/** \defgroup key_derivation Key derivation and pseudorandom generation
* @{
*/
/** The type of the state data structure for key derivation operations.
*
* Before calling any function on a key derivation operation object, the
* application must initialize it by any of the following means:
* - Set the structure to all-bits-zero, for example:
* \code
* psa_key_derivation_operation_t operation;
* memset(&operation, 0, sizeof(operation));
* \endcode
* - Initialize the structure to logical zero values, for example:
* \code
* psa_key_derivation_operation_t operation = {0};
* \endcode
* - Initialize the structure to the initializer #PSA_KEY_DERIVATION_OPERATION_INIT,
* for example:
* \code
* psa_key_derivation_operation_t operation = PSA_KEY_DERIVATION_OPERATION_INIT;
* \endcode
* - Assign the result of the function psa_key_derivation_operation_init()
* to the structure, for example:
* \code
* psa_key_derivation_operation_t operation;
* operation = psa_key_derivation_operation_init();
* \endcode
*
* This is an implementation-defined \c struct. Applications should not
* make any assumptions about the content of this structure except
* as directed by the documentation of a specific implementation.
*/
typedef struct psa_key_derivation_s psa_key_derivation_operation_t;
/** \def PSA_KEY_DERIVATION_OPERATION_INIT
*
* This macro returns a suitable initializer for a key derivation operation
* object of type #psa_key_derivation_operation_t.
*/
#ifdef __DOXYGEN_ONLY__
/* This is an example definition for documentation purposes.
* Implementations should define a suitable value in `crypto_struct.h`.
*/
#define PSA_KEY_DERIVATION_OPERATION_INIT {0}
#endif
/** Return an initial value for a key derivation operation object.
*/
static psa_key_derivation_operation_t psa_key_derivation_operation_init(void);
/** Set up a key derivation operation.
*
* A key derivation algorithm takes some inputs and uses them to generate
* a byte stream in a deterministic way.
* This byte stream can be used to produce keys and other
* cryptographic material.
*
* To derive a key:
* -# Start with an initialized object of type #psa_key_derivation_operation_t.
* -# Call psa_key_derivation_setup() to select the algorithm.
* -# Provide the inputs for the key derivation by calling
* psa_key_derivation_input_bytes() or psa_key_derivation_input_key()
* as appropriate. Which inputs are needed, in what order, and whether
* they may be keys and if so of what type depends on the algorithm.
* -# Optionally set the operation's maximum capacity with
* psa_key_derivation_set_capacity(). You may do this before, in the middle
* of or after providing inputs. For some algorithms, this step is mandatory
* because the output depends on the maximum capacity.
* -# To derive a key, call psa_key_derivation_output_key().
* To derive a byte string for a different purpose, call
* psa_key_derivation_output_bytes().
* Successive calls to these functions use successive output bytes
* calculated by the key derivation algorithm.
* -# Clean up the key derivation operation object with
* psa_key_derivation_abort().
*
* If this function returns an error, the key derivation operation object is
* not changed.
*
* If an error occurs at any step after a call to psa_key_derivation_setup(),
* the operation will need to be reset by a call to psa_key_derivation_abort().
*
* Implementations must reject an attempt to derive a key of size 0.
*
* \param[in,out] operation The key derivation operation object
* to set up. It must
* have been initialized but not set up yet.
* \param alg The key derivation algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_KEY_DERIVATION(\p alg) is true).
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c alg is not a key derivation algorithm.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not a key derivation algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be inactive).
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_setup(
psa_key_derivation_operation_t *operation,
psa_algorithm_t alg);
/** Retrieve the current capacity of a key derivation operation.
*
* The capacity of a key derivation is the maximum number of bytes that it can
* return. When you get *N* bytes of output from a key derivation operation,
* this reduces its capacity by *N*.
*
* \param[in] operation The operation to query.
* \param[out] capacity On success, the capacity of the operation.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active).
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_get_capacity(
const psa_key_derivation_operation_t *operation,
size_t *capacity);
/** Set the maximum capacity of a key derivation operation.
*
* The capacity of a key derivation operation is the maximum number of bytes
* that the key derivation operation can return from this point onwards.
*
* \param[in,out] operation The key derivation operation object to modify.
* \param capacity The new capacity of the operation.
* It must be less or equal to the operation's
* current capacity.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p capacity is larger than the operation's current capacity.
* In this case, the operation object remains valid and its capacity
* remains unchanged.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active).
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_set_capacity(
psa_key_derivation_operation_t *operation,
size_t capacity);
/** Use the maximum possible capacity for a key derivation operation.
*
* Use this value as the capacity argument when setting up a key derivation
* to indicate that the operation should have the maximum possible capacity.
* The value of the maximum possible capacity depends on the key derivation
* algorithm.
*/
#define PSA_KEY_DERIVATION_UNLIMITED_CAPACITY ((size_t)(-1))
/** Provide an input for key derivation or key agreement.
*
* Which inputs are required and in what order depends on the algorithm.
* Refer to the documentation of each key derivation or key agreement
* algorithm for information.
*
* This function passes direct inputs, which is usually correct for
* non-secret inputs. To pass a secret input, which should be in a key
* object, call psa_key_derivation_input_key() instead of this function.
* Refer to the documentation of individual step types
* (`PSA_KEY_DERIVATION_INPUT_xxx` values of type ::psa_key_derivation_step_t)
* for more information.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_key_derivation_abort().
*
* \param[in,out] operation The key derivation operation object to use.
* It must have been set up with
* psa_key_derivation_setup() and must not
* have produced any output yet.
* \param step Which step the input data is for.
* \param[in] data Input data to use.
* \param data_length Size of the \p data buffer in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step is not compatible with the operation's algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step does not allow direct inputs.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid for this input \p step.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_input_bytes(
psa_key_derivation_operation_t *operation,
psa_key_derivation_step_t step,
const uint8_t *data,
size_t data_length);
/** Provide an input for key derivation in the form of a key.
*
* Which inputs are required and in what order depends on the algorithm.
* Refer to the documentation of each key derivation or key agreement
* algorithm for information.
*
* This function obtains input from a key object, which is usually correct for
* secret inputs or for non-secret personalization strings kept in the key
* store. To pass a non-secret parameter which is not in the key store,
* call psa_key_derivation_input_bytes() instead of this function.
* Refer to the documentation of individual step types
* (`PSA_KEY_DERIVATION_INPUT_xxx` values of type ::psa_key_derivation_step_t)
* for more information.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_key_derivation_abort().
*
* \param[in,out] operation The key derivation operation object to use.
* It must have been set up with
* psa_key_derivation_setup() and must not
* have produced any output yet.
* \param step Which step the input data is for.
* \param handle Handle to the key. It must have an
* appropriate type for \p step and must
* allow the usage #PSA_KEY_USAGE_DERIVE.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step is not compatible with the operation's algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step does not allow key inputs of the given type
* or does not allow key inputs at all.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid for this input \p step.
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_input_key(
psa_key_derivation_operation_t *operation,
psa_key_derivation_step_t step,
psa_key_handle_t handle);
/** Perform a key agreement and use the shared secret as input to a key
* derivation.
*
* A key agreement algorithm takes two inputs: a private key \p private_key
* a public key \p peer_key.
* The result of this function is passed as input to a key derivation.
* The output of this key derivation can be extracted by reading from the
* resulting operation to produce keys and other cryptographic material.
*
* If this function returns an error status, the operation enters an error
* state and must be aborted by calling psa_key_derivation_abort().
*
* \param[in,out] operation The key derivation operation object to use.
* It must have been set up with
* psa_key_derivation_setup() with a
* key agreement and derivation algorithm
* \c alg (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_KEY_AGREEMENT(\c alg) is true
* and #PSA_ALG_IS_RAW_KEY_AGREEMENT(\c alg)
* is false).
* The operation must be ready for an
* input of the type given by \p step.
* \param step Which step the input data is for.
* \param private_key Handle to the private key to use.
* \param[in] peer_key Public key of the peer. The peer key must be in the
* same format that psa_import_key() accepts for the
* public key type corresponding to the type of
* private_key. That is, this function performs the
* equivalent of
* #psa_import_key(...,
* `peer_key`, `peer_key_length`) where
* with key attributes indicating the public key
* type corresponding to the type of `private_key`.
* For example, for EC keys, this means that peer_key
* is interpreted as a point on the curve that the
* private key is on. The standard formats for public
* keys are documented in the documentation of
* psa_export_public_key().
* \param peer_key_length Size of \p peer_key in bytes.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid for this key agreement \p step.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c private_key is not compatible with \c alg,
* or \p peer_key is not valid for \c alg or not compatible with
* \c private_key.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \c alg is not supported or is not a key derivation algorithm.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c step does not allow an input resulting from a key agreement.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_key_agreement(
psa_key_derivation_operation_t *operation,
psa_key_derivation_step_t step,
psa_key_handle_t private_key,
const uint8_t *peer_key,
size_t peer_key_length);
/** Read some data from a key derivation operation.
*
* This function calculates output bytes from a key derivation algorithm and
* return those bytes.
* If you view the key derivation's output as a stream of bytes, this
* function destructively reads the requested number of bytes from the
* stream.
* The operation's capacity decreases by the number of bytes read.
*
* If this function returns an error status other than
* #PSA_ERROR_INSUFFICIENT_DATA, the operation enters an error
* state and must be aborted by calling psa_key_derivation_abort().
*
* \param[in,out] operation The key derivation operation object to read from.
* \param[out] output Buffer where the output will be written.
* \param output_length Number of bytes to output.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_INSUFFICIENT_DATA
* The operation's capacity was less than
* \p output_length bytes. Note that in this case,
* no output is written to the output buffer.
* The operation's capacity is set to 0, thus
* subsequent calls to this function will not
* succeed, even with a smaller output buffer.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active and completed
* all required input steps).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_output_bytes(
psa_key_derivation_operation_t *operation,
uint8_t *output,
size_t output_length);
/** Derive a key from an ongoing key derivation operation.
*
* This function calculates output bytes from a key derivation algorithm
* and uses those bytes to generate a key deterministically.
* The key's location, usage policy, type and size are taken from
* \p attributes.
*
* If you view the key derivation's output as a stream of bytes, this
* function destructively reads as many bytes as required from the
* stream.
* The operation's capacity decreases by the number of bytes read.
*
* If this function returns an error status other than
* #PSA_ERROR_INSUFFICIENT_DATA, the operation enters an error
* state and must be aborted by calling psa_key_derivation_abort().
*
* How much output is produced and consumed from the operation, and how
* the key is derived, depends on the key type:
*
* - For key types for which the key is an arbitrary sequence of bytes
* of a given size, this function is functionally equivalent to
* calling #psa_key_derivation_output_bytes
* and passing the resulting output to #psa_import_key.
* However, this function has a security benefit:
* if the implementation provides an isolation boundary then
* the key material is not exposed outside the isolation boundary.
* As a consequence, for these key types, this function always consumes
* exactly (\p bits / 8) bytes from the operation.
* The following key types defined in this specification follow this scheme:
*
* - #PSA_KEY_TYPE_AES;
* - #PSA_KEY_TYPE_ARC4;
* - #PSA_KEY_TYPE_CAMELLIA;
* - #PSA_KEY_TYPE_DERIVE;
* - #PSA_KEY_TYPE_HMAC.
*
* - For ECC keys on a Montgomery elliptic curve
* (#PSA_KEY_TYPE_ECC_KEY_PAIR(\c curve) where \c curve designates a
* Montgomery curve), this function always draws a byte string whose
* length is determined by the curve, and sets the mandatory bits
* accordingly. That is:
*
* - Curve25519 (#PSA_ECC_CURVE_MONTGOMERY, 255 bits): draw a 32-byte
* string and process it as specified in RFC 7748 &sect;5.
* - Curve448 (#PSA_ECC_CURVE_MONTGOMERY, 448 bits): draw a 56-byte
* string and process it as specified in RFC 7748 &sect;5.
*
* - For key types for which the key is represented by a single sequence of
* \p bits bits with constraints as to which bit sequences are acceptable,
* this function draws a byte string of length (\p bits / 8) bytes rounded
* up to the nearest whole number of bytes. If the resulting byte string
* is acceptable, it becomes the key, otherwise the drawn bytes are discarded.
* This process is repeated until an acceptable byte string is drawn.
* The byte string drawn from the operation is interpreted as specified
* for the output produced by psa_export_key().
* The following key types defined in this specification follow this scheme:
*
* - #PSA_KEY_TYPE_DES.
* Force-set the parity bits, but discard forbidden weak keys.
* For 2-key and 3-key triple-DES, the three keys are generated
* successively (for example, for 3-key triple-DES,
* if the first 8 bytes specify a weak key and the next 8 bytes do not,
* discard the first 8 bytes, use the next 8 bytes as the first key,
* and continue reading output from the operation to derive the other
* two keys).
* - Finite-field Diffie-Hellman keys (#PSA_KEY_TYPE_DH_KEY_PAIR(\c group)
* where \c group designates any Diffie-Hellman group) and
* ECC keys on a Weierstrass elliptic curve
* (#PSA_KEY_TYPE_ECC_KEY_PAIR(\c curve) where \c curve designates a
* Weierstrass curve).
* For these key types, interpret the byte string as integer
* in big-endian order. Discard it if it is not in the range
* [0, *N* - 2] where *N* is the boundary of the private key domain
* (the prime *p* for Diffie-Hellman, the subprime *q* for DSA,
* or the order of the curve's base point for ECC).
* Add 1 to the resulting integer and use this as the private key *x*.
* This method allows compliance to NIST standards, specifically
* the methods titled "key-pair generation by testing candidates"
* in NIST SP 800-56A &sect;5.6.1.1.4 for Diffie-Hellman,
* in FIPS 186-4 &sect;B.1.2 for DSA, and
* in NIST SP 800-56A &sect;5.6.1.2.2 or
* FIPS 186-4 &sect;B.4.2 for elliptic curve keys.
*
* - For other key types, including #PSA_KEY_TYPE_RSA_KEY_PAIR,
* the way in which the operation output is consumed is
* implementation-defined.
*
* In all cases, the data that is read is discarded from the operation.
* The operation's capacity is decreased by the number of bytes read.
*
* For algorithms that take an input step #PSA_KEY_DERIVATION_INPUT_SECRET,
* the input to that step must be provided with psa_key_derivation_input_key().
* Future versions of this specification may include additional restrictions
* on the derived key based on the attributes and strength of the secret key.
*
* \param[in] attributes The attributes for the new key.
* \param[in,out] operation The key derivation operation object to read from.
* \param[out] handle On success, a handle to the newly created key.
* \c 0 on failure.
*
* \retval #PSA_SUCCESS
* Success.
* If the key is persistent, the key material and the key's metadata
* have been saved to persistent storage.
* \retval #PSA_ERROR_ALREADY_EXISTS
* This is an attempt to create a persistent key, and there is
* already a persistent key with the given identifier.
* \retval #PSA_ERROR_INSUFFICIENT_DATA
* There was not enough data to create the desired key.
* Note that in this case, no output is written to the output buffer.
* The operation's capacity is set to 0, thus subsequent calls to
* this function will not succeed, even with a smaller output buffer.
* \retval #PSA_ERROR_NOT_SUPPORTED
* The key type or key size is not supported, either by the
* implementation in general or in this particular location.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The provided key attributes are not valid for the operation.
* \retval #PSA_ERROR_NOT_PERMITTED
* The #PSA_KEY_DERIVATION_INPUT_SECRET input was not provided through
* a key.
* \retval #PSA_ERROR_BAD_STATE
* The operation state is not valid (it must be active and completed
* all required input steps).
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_INSUFFICIENT_STORAGE
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_output_key(
const psa_key_attributes_t *attributes,
psa_key_derivation_operation_t *operation,
psa_key_handle_t *handle);
/** Abort a key derivation operation.
*
* Aborting an operation frees all associated resources except for the \c
* operation structure itself. Once aborted, the operation object can be reused
* for another operation by calling psa_key_derivation_setup() again.
*
* This function may be called at any time after the operation
* object has been initialized as described in #psa_key_derivation_operation_t.
*
* In particular, it is valid to call psa_key_derivation_abort() twice, or to
* call psa_key_derivation_abort() on an operation that has not been set up.
*
* \param[in,out] operation The operation to abort.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_key_derivation_abort(
psa_key_derivation_operation_t *operation);
/** Perform a key agreement and return the raw shared secret.
*
* \warning The raw result of a key agreement algorithm such as finite-field
* Diffie-Hellman or elliptic curve Diffie-Hellman has biases and should
* not be used directly as key material. It should instead be passed as
* input to a key derivation algorithm. To chain a key agreement with
* a key derivation, use psa_key_derivation_key_agreement() and other
* functions from the key derivation interface.
*
* \param alg The key agreement algorithm to compute
* (\c PSA_ALG_XXX value such that
* #PSA_ALG_IS_RAW_KEY_AGREEMENT(\p alg)
* is true).
* \param private_key Handle to the private key to use.
* \param[in] peer_key Public key of the peer. It must be
* in the same format that psa_import_key()
* accepts. The standard formats for public
* keys are documented in the documentation
* of psa_export_public_key().
* \param peer_key_length Size of \p peer_key in bytes.
* \param[out] output Buffer where the decrypted message is to
* be written.
* \param output_size Size of the \c output buffer in bytes.
* \param[out] output_length On success, the number of bytes
* that make up the returned output.
*
* \retval #PSA_SUCCESS
* Success.
* \retval #PSA_ERROR_INVALID_HANDLE
* \retval #PSA_ERROR_NOT_PERMITTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p alg is not a key agreement algorithm
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \p private_key is not compatible with \p alg,
* or \p peer_key is not valid for \p alg or not compatible with
* \p private_key.
* \retval #PSA_ERROR_BUFFER_TOO_SMALL
* \p output_size is too small
* \retval #PSA_ERROR_NOT_SUPPORTED
* \p alg is not a supported key agreement algorithm.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_raw_key_agreement(psa_algorithm_t alg,
psa_key_handle_t private_key,
const uint8_t *peer_key,
size_t peer_key_length,
uint8_t *output,
size_t output_size,
size_t *output_length);
/**@}*/
/** \defgroup random Random generation
* @{
*/
/**
* \brief Generate random bytes.
*
* \warning This function **can** fail! Callers MUST check the return status
* and MUST NOT use the content of the output buffer if the return
* status is not #PSA_SUCCESS.
*
* \note To generate a key, use psa_generate_key() instead.
*
* \param[out] output Output buffer for the generated data.
* \param output_size Number of bytes to generate and output.
*
* \retval #PSA_SUCCESS
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_generate_random(uint8_t *output,
size_t output_size);
/**
* \brief Generate a key or key pair.
*
* The key is generated randomly.
* Its location, usage policy, type and size are taken from \p attributes.
*
* Implementations must reject an attempt to generate a key of size 0.
*
* The following type-specific considerations apply:
* - For RSA keys (#PSA_KEY_TYPE_RSA_KEY_PAIR),
* the public exponent is 65537.
* The modulus is a product of two probabilistic primes
* between 2^{n-1} and 2^n where n is the bit size specified in the
* attributes.
*
* \param[in] attributes The attributes for the new key.
* \param[out] handle On success, a handle to the newly created key.
* \c 0 on failure.
*
* \retval #PSA_SUCCESS
* Success.
* If the key is persistent, the key material and the key's metadata
* have been saved to persistent storage.
* \retval #PSA_ERROR_ALREADY_EXISTS
* This is an attempt to create a persistent key, and there is
* already a persistent key with the given identifier.
* \retval #PSA_ERROR_NOT_SUPPORTED
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_INSUFFICIENT_ENTROPY
* \retval #PSA_ERROR_COMMUNICATION_FAILURE
* \retval #PSA_ERROR_HARDWARE_FAILURE
* \retval #PSA_ERROR_CORRUPTION_DETECTED
* \retval #PSA_ERROR_INSUFFICIENT_STORAGE
* \retval #PSA_ERROR_STORAGE_FAILURE
* \retval #PSA_ERROR_BAD_STATE
* The library has not been previously initialized by psa_crypto_init().
* It is implementation-dependent whether a failure to initialize
* results in this error code.
*/
psa_status_t psa_generate_key(const psa_key_attributes_t *attributes,
psa_key_handle_t *handle);
/**@}*/
#ifdef __cplusplus
}
#endif
/* The file "crypto_sizes.h" contains definitions for size calculation
* macros whose definitions are implementation-specific. */
#include "crypto_sizes.h"
/* The file "crypto_struct.h" contains definitions for
* implementation-specific structs that are declared above. */
#include "crypto_struct.h"
/* The file "crypto_extra.h" contains vendor-specific definitions. This
* can include vendor-defined algorithms, extra functions, etc. */
#include "crypto_extra.h"
#endif /* PSA_CRYPTO_H */
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