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mbedtls/include/mbedtls/rsa.h
Jaeden Amero fb236739da Revert "Forbid passing NULL input buffers to RSA encryption routines" 
Resolve incompatibilties in the RSA module where changes made for
parameter validation prevent Mbed Crypto from working. Mbed Crypto
depends on being able to pass zero-length buffers that are NULL to RSA
encryption functions.

This reverts commit 2f660d047d.
2019-02-08 08:43:31 -05:00

1275 lines
63 KiB
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/**
* \file rsa.h
*
* \brief This file provides an API for the RSA public-key cryptosystem.
*
* The RSA public-key cryptosystem is defined in <em>Public-Key
* Cryptography Standards (PKCS) #1 v1.5: RSA Encryption</em>
* and <em>Public-Key Cryptography Standards (PKCS) #1 v2.1:
* RSA Cryptography Specifications</em>.
*
*/
/*
* Copyright (C) 2006-2018, Arm Limited (or its affiliates), 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.
*
* This file is part of Mbed TLS (https://tls.mbed.org)
*/
#ifndef MBEDTLS_RSA_H
#define MBEDTLS_RSA_H
#if !defined(MBEDTLS_CONFIG_FILE)
#include "config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include "bignum.h"
#include "md.h"
#if defined(MBEDTLS_THREADING_C)
#include "threading.h"
#endif
/*
* RSA Error codes
*/
#define MBEDTLS_ERR_RSA_BAD_INPUT_DATA -0x4080 /**< Bad input parameters to function. */
#define MBEDTLS_ERR_RSA_INVALID_PADDING -0x4100 /**< Input data contains invalid padding and is rejected. */
#define MBEDTLS_ERR_RSA_KEY_GEN_FAILED -0x4180 /**< Something failed during generation of a key. */
#define MBEDTLS_ERR_RSA_KEY_CHECK_FAILED -0x4200 /**< Key failed to pass the validity check of the library. */
#define MBEDTLS_ERR_RSA_PUBLIC_FAILED -0x4280 /**< The public key operation failed. */
#define MBEDTLS_ERR_RSA_PRIVATE_FAILED -0x4300 /**< The private key operation failed. */
#define MBEDTLS_ERR_RSA_VERIFY_FAILED -0x4380 /**< The PKCS#1 verification failed. */
#define MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE -0x4400 /**< The output buffer for decryption is not large enough. */
#define MBEDTLS_ERR_RSA_RNG_FAILED -0x4480 /**< The random generator failed to generate non-zeros. */
/* MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION is deprecated and should not be used.
*/
#define MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION -0x4500 /**< The implementation does not offer the requested operation, for example, because of security violations or lack of functionality. */
/* MBEDTLS_ERR_RSA_HW_ACCEL_FAILED is deprecated and should not be used. */
#define MBEDTLS_ERR_RSA_HW_ACCEL_FAILED -0x4580 /**< RSA hardware accelerator failed. */
/*
* RSA constants
*/
#define MBEDTLS_RSA_PUBLIC 0 /**< Request private key operation. */
#define MBEDTLS_RSA_PRIVATE 1 /**< Request public key operation. */
#define MBEDTLS_RSA_PKCS_V15 0 /**< Use PKCS#1 v1.5 encoding. */
#define MBEDTLS_RSA_PKCS_V21 1 /**< Use PKCS#1 v2.1 encoding. */
#define MBEDTLS_RSA_SIGN 1 /**< Identifier for RSA signature operations. */
#define MBEDTLS_RSA_CRYPT 2 /**< Identifier for RSA encryption and decryption operations. */
#define MBEDTLS_RSA_SALT_LEN_ANY -1
/*
* The above constants may be used even if the RSA module is compile out,
* eg for alternative (PKCS#11) RSA implemenations in the PK layers.
*/
#ifdef __cplusplus
extern "C" {
#endif
#if !defined(MBEDTLS_RSA_ALT)
// Regular implementation
//
/**
* \brief The RSA context structure.
*
* \note Direct manipulation of the members of this structure
* is deprecated. All manipulation should instead be done through
* the public interface functions.
*/
typedef struct mbedtls_rsa_context
{
int ver; /*!< Always 0.*/
size_t len; /*!< The size of \p N in Bytes. */
mbedtls_mpi N; /*!< The public modulus. */
mbedtls_mpi E; /*!< The public exponent. */
mbedtls_mpi D; /*!< The private exponent. */
mbedtls_mpi P; /*!< The first prime factor. */
mbedtls_mpi Q; /*!< The second prime factor. */
mbedtls_mpi DP; /*!< <code>D % (P - 1)</code>. */
mbedtls_mpi DQ; /*!< <code>D % (Q - 1)</code>. */
mbedtls_mpi QP; /*!< <code>1 / (Q % P)</code>. */
mbedtls_mpi RN; /*!< cached <code>R^2 mod N</code>. */
mbedtls_mpi RP; /*!< cached <code>R^2 mod P</code>. */
mbedtls_mpi RQ; /*!< cached <code>R^2 mod Q</code>. */
mbedtls_mpi Vi; /*!< The cached blinding value. */
mbedtls_mpi Vf; /*!< The cached un-blinding value. */
int padding; /*!< Selects padding mode:
#MBEDTLS_RSA_PKCS_V15 for 1.5 padding and
#MBEDTLS_RSA_PKCS_V21 for OAEP or PSS. */
int hash_id; /*!< Hash identifier of mbedtls_md_type_t type,
as specified in md.h for use in the MGF
mask generating function used in the
EME-OAEP and EMSA-PSS encodings. */
#if defined(MBEDTLS_THREADING_C)
mbedtls_threading_mutex_t mutex; /*!< Thread-safety mutex. */
#endif
}
mbedtls_rsa_context;
#else /* MBEDTLS_RSA_ALT */
#include "rsa_alt.h"
#endif /* MBEDTLS_RSA_ALT */
/**
* \brief This function initializes an RSA context.
*
* \note Set padding to #MBEDTLS_RSA_PKCS_V21 for the RSAES-OAEP
* encryption scheme and the RSASSA-PSS signature scheme.
*
* \note The \p hash_id parameter is ignored when using
* #MBEDTLS_RSA_PKCS_V15 padding.
*
* \note The choice of padding mode is strictly enforced for private key
* operations, since there might be security concerns in
* mixing padding modes. For public key operations it is
* a default value, which can be overridden by calling specific
* \c rsa_rsaes_xxx or \c rsa_rsassa_xxx functions.
*
* \note The hash selected in \p hash_id is always used for OEAP
* encryption. For PSS signatures, it is always used for
* making signatures, but can be overridden for verifying them.
* If set to #MBEDTLS_MD_NONE, it is always overridden.
*
* \param ctx The RSA context to initialize. This must not be \c NULL.
* \param padding The padding mode to use. This must be either
* #MBEDTLS_RSA_PKCS_V15 or #MBEDTLS_RSA_PKCS_V21.
* \param hash_id The hash identifier of ::mbedtls_md_type_t type, if
* \p padding is #MBEDTLS_RSA_PKCS_V21. It is unused
* otherwise.
*/
void mbedtls_rsa_init( mbedtls_rsa_context *ctx,
int padding,
int hash_id );
/**
* \brief This function imports a set of core parameters into an
* RSA context.
*
* \note This function can be called multiple times for successive
* imports, if the parameters are not simultaneously present.
*
* Any sequence of calls to this function should be followed
* by a call to mbedtls_rsa_complete(), which checks and
* completes the provided information to a ready-for-use
* public or private RSA key.
*
* \note See mbedtls_rsa_complete() for more information on which
* parameters are necessary to set up a private or public
* RSA key.
*
* \note The imported parameters are copied and need not be preserved
* for the lifetime of the RSA context being set up.
*
* \param ctx The initialized RSA context to store the parameters in.
* \param N The RSA modulus. This may be \c NULL.
* \param P The first prime factor of \p N. This may be \c NULL.
* \param Q The second prime factor of \p N. This may be \c NULL.
* \param D The private exponent. This may be \c NULL.
* \param E The public exponent. This may be \c NULL.
*
* \return \c 0 on success.
* \return A non-zero error code on failure.
*/
int mbedtls_rsa_import( mbedtls_rsa_context *ctx,
const mbedtls_mpi *N,
const mbedtls_mpi *P, const mbedtls_mpi *Q,
const mbedtls_mpi *D, const mbedtls_mpi *E );
/**
* \brief This function imports core RSA parameters, in raw big-endian
* binary format, into an RSA context.
*
* \note This function can be called multiple times for successive
* imports, if the parameters are not simultaneously present.
*
* Any sequence of calls to this function should be followed
* by a call to mbedtls_rsa_complete(), which checks and
* completes the provided information to a ready-for-use
* public or private RSA key.
*
* \note See mbedtls_rsa_complete() for more information on which
* parameters are necessary to set up a private or public
* RSA key.
*
* \note The imported parameters are copied and need not be preserved
* for the lifetime of the RSA context being set up.
*
* \param ctx The initialized RSA context to store the parameters in.
* \param N The RSA modulus. This may be \c NULL.
* \param N_len The Byte length of \p N; it is ignored if \p N == NULL.
* \param P The first prime factor of \p N. This may be \c NULL.
* \param P_len The Byte length of \p P; it ns ignored if \p P == NULL.
* \param Q The second prime factor of \p N. This may be \c NULL.
* \param Q_len The Byte length of \p Q; it is ignored if \p Q == NULL.
* \param D The private exponent. This may be \c NULL.
* \param D_len The Byte length of \p D; it is ignored if \p D == NULL.
* \param E The public exponent. This may be \c NULL.
* \param E_len The Byte length of \p E; it is ignored if \p E == NULL.
*
* \return \c 0 on success.
* \return A non-zero error code on failure.
*/
int mbedtls_rsa_import_raw( mbedtls_rsa_context *ctx,
unsigned char const *N, size_t N_len,
unsigned char const *P, size_t P_len,
unsigned char const *Q, size_t Q_len,
unsigned char const *D, size_t D_len,
unsigned char const *E, size_t E_len );
/**
* \brief This function completes an RSA context from
* a set of imported core parameters.
*
* To setup an RSA public key, precisely \p N and \p E
* must have been imported.
*
* To setup an RSA private key, sufficient information must
* be present for the other parameters to be derivable.
*
* The default implementation supports the following:
* <ul><li>Derive \p P, \p Q from \p N, \p D, \p E.</li>
* <li>Derive \p N, \p D from \p P, \p Q, \p E.</li></ul>
* Alternative implementations need not support these.
*
* If this function runs successfully, it guarantees that
* the RSA context can be used for RSA operations without
* the risk of failure or crash.
*
* \warning This function need not perform consistency checks
* for the imported parameters. In particular, parameters that
* are not needed by the implementation might be silently
* discarded and left unchecked. To check the consistency
* of the key material, see mbedtls_rsa_check_privkey().
*
* \param ctx The initialized RSA context holding imported parameters.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_RSA_BAD_INPUT_DATA if the attempted derivations
* failed.
*
*/
int mbedtls_rsa_complete( mbedtls_rsa_context *ctx );
/**
* \brief This function exports the core parameters of an RSA key.
*
* If this function runs successfully, the non-NULL buffers
* pointed to by \p N, \p P, \p Q, \p D, and \p E are fully
* written, with additional unused space filled leading by
* zero Bytes.
*
* Possible reasons for returning
* #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED:<ul>
* <li>An alternative RSA implementation is in use, which
* stores the key externally, and either cannot or should
* not export it into RAM.</li>
* <li>A SW or HW implementation might not support a certain
* deduction. For example, \p P, \p Q from \p N, \p D,
* and \p E if the former are not part of the
* implementation.</li></ul>
*
* If the function fails due to an unsupported operation,
* the RSA context stays intact and remains usable.
*
* \param ctx The initialized RSA context.
* \param N The MPI to hold the RSA modulus.
* This may be \c NULL if this field need not be exported.
* \param P The MPI to hold the first prime factor of \p N.
* This may be \c NULL if this field need not be exported.
* \param Q The MPI to hold the second prime factor of \p N.
* This may be \c NULL if this field need not be exported.
* \param D The MPI to hold the private exponent.
* This may be \c NULL if this field need not be exported.
* \param E The MPI to hold the public exponent.
* This may be \c NULL if this field need not be exported.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED if exporting the
* requested parameters cannot be done due to missing
* functionality or because of security policies.
* \return A non-zero return code on any other failure.
*
*/
int mbedtls_rsa_export( const mbedtls_rsa_context *ctx,
mbedtls_mpi *N, mbedtls_mpi *P, mbedtls_mpi *Q,
mbedtls_mpi *D, mbedtls_mpi *E );
/**
* \brief This function exports core parameters of an RSA key
* in raw big-endian binary format.
*
* If this function runs successfully, the non-NULL buffers
* pointed to by \p N, \p P, \p Q, \p D, and \p E are fully
* written, with additional unused space filled leading by
* zero Bytes.
*
* Possible reasons for returning
* #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED:<ul>
* <li>An alternative RSA implementation is in use, which
* stores the key externally, and either cannot or should
* not export it into RAM.</li>
* <li>A SW or HW implementation might not support a certain
* deduction. For example, \p P, \p Q from \p N, \p D,
* and \p E if the former are not part of the
* implementation.</li></ul>
* If the function fails due to an unsupported operation,
* the RSA context stays intact and remains usable.
*
* \note The length parameters are ignored if the corresponding
* buffer pointers are NULL.
*
* \param ctx The initialized RSA context.
* \param N The Byte array to store the RSA modulus,
* or \c NULL if this field need not be exported.
* \param N_len The size of the buffer for the modulus.
* \param P The Byte array to hold the first prime factor of \p N,
* or \c NULL if this field need not be exported.
* \param P_len The size of the buffer for the first prime factor.
* \param Q The Byte array to hold the second prime factor of \p N,
* or \c NULL if this field need not be exported.
* \param Q_len The size of the buffer for the second prime factor.
* \param D The Byte array to hold the private exponent,
* or \c NULL if this field need not be exported.
* \param D_len The size of the buffer for the private exponent.
* \param E The Byte array to hold the public exponent,
* or \c NULL if this field need not be exported.
* \param E_len The size of the buffer for the public exponent.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED if exporting the
* requested parameters cannot be done due to missing
* functionality or because of security policies.
* \return A non-zero return code on any other failure.
*/
int mbedtls_rsa_export_raw( const mbedtls_rsa_context *ctx,
unsigned char *N, size_t N_len,
unsigned char *P, size_t P_len,
unsigned char *Q, size_t Q_len,
unsigned char *D, size_t D_len,
unsigned char *E, size_t E_len );
/**
* \brief This function exports CRT parameters of a private RSA key.
*
* \note Alternative RSA implementations not using CRT-parameters
* internally can implement this function based on
* mbedtls_rsa_deduce_opt().
*
* \param ctx The initialized RSA context.
* \param DP The MPI to hold \c D modulo `P-1`,
* or \c NULL if it need not be exported.
* \param DQ The MPI to hold \c D modulo `Q-1`,
* or \c NULL if it need not be exported.
* \param QP The MPI to hold modular inverse of \c Q modulo \c P,
* or \c NULL if it need not be exported.
*
* \return \c 0 on success.
* \return A non-zero error code on failure.
*
*/
int mbedtls_rsa_export_crt( const mbedtls_rsa_context *ctx,
mbedtls_mpi *DP, mbedtls_mpi *DQ, mbedtls_mpi *QP );
/**
* \brief This function sets padding for an already initialized RSA
* context. See mbedtls_rsa_init() for details.
*
* \param ctx The initialized RSA context to be configured.
* \param padding The padding mode to use. This must be either
* #MBEDTLS_RSA_PKCS_V15 or #MBEDTLS_RSA_PKCS_V21.
* \param hash_id The #MBEDTLS_RSA_PKCS_V21 hash identifier.
*/
void mbedtls_rsa_set_padding( mbedtls_rsa_context *ctx, int padding,
int hash_id );
/**
* \brief This function retrieves the length of RSA modulus in Bytes.
*
* \param ctx The initialized RSA context.
*
* \return The length of the RSA modulus in Bytes.
*
*/
size_t mbedtls_rsa_get_len( const mbedtls_rsa_context *ctx );
/**
* \brief This function generates an RSA keypair.
*
* \note mbedtls_rsa_init() must be called before this function,
* to set up the RSA context.
*
* \param ctx The initialized RSA context used to hold the key.
* \param f_rng The RNG function to be used for key generation.
* This must not be \c NULL.
* \param p_rng The RNG context to be passed to \p f_rng.
* This may be \c NULL if \p f_rng doesn't need a context.
* \param nbits The size of the public key in bits.
* \param exponent The public exponent to use. For example, \c 65537.
* This must be odd and greater than \c 1.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_gen_key( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
unsigned int nbits, int exponent );
/**
* \brief This function checks if a context contains at least an RSA
* public key.
*
* If the function runs successfully, it is guaranteed that
* enough information is present to perform an RSA public key
* operation using mbedtls_rsa_public().
*
* \param ctx The initialized RSA context to check.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*
*/
int mbedtls_rsa_check_pubkey( const mbedtls_rsa_context *ctx );
/**
* \brief This function checks if a context contains an RSA private key
* and perform basic consistency checks.
*
* \note The consistency checks performed by this function not only
* ensure that mbedtls_rsa_private() can be called successfully
* on the given context, but that the various parameters are
* mutually consistent with high probability, in the sense that
* mbedtls_rsa_public() and mbedtls_rsa_private() are inverses.
*
* \warning This function should catch accidental misconfigurations
* like swapping of parameters, but it cannot establish full
* trust in neither the quality nor the consistency of the key
* material that was used to setup the given RSA context:
* <ul><li>Consistency: Imported parameters that are irrelevant
* for the implementation might be silently dropped. If dropped,
* the current function does not have access to them,
* and therefore cannot check them. See mbedtls_rsa_complete().
* If you want to check the consistency of the entire
* content of an PKCS1-encoded RSA private key, for example, you
* should use mbedtls_rsa_validate_params() before setting
* up the RSA context.
* Additionally, if the implementation performs empirical checks,
* these checks substantiate but do not guarantee consistency.</li>
* <li>Quality: This function is not expected to perform
* extended quality assessments like checking that the prime
* factors are safe. Additionally, it is the responsibility of the
* user to ensure the trustworthiness of the source of his RSA
* parameters, which goes beyond what is effectively checkable
* by the library.</li></ul>
*
* \param ctx The initialized RSA context to check.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_check_privkey( const mbedtls_rsa_context *ctx );
/**
* \brief This function checks a public-private RSA key pair.
*
* It checks each of the contexts, and makes sure they match.
*
* \param pub The initialized RSA context holding the public key.
* \param prv The initialized RSA context holding the private key.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_check_pub_priv( const mbedtls_rsa_context *pub,
const mbedtls_rsa_context *prv );
/**
* \brief This function performs an RSA public key operation.
*
* \param ctx The initialized RSA context to use.
* \param input The input buffer. This must be a readable buffer
* of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
* \param output The output buffer. This must be a writable buffer
* of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \note This function does not handle message padding.
*
* \note Make sure to set \p input[0] = 0 or ensure that
* input is smaller than \p N.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_public( mbedtls_rsa_context *ctx,
const unsigned char *input,
unsigned char *output );
/**
* \brief This function performs an RSA private key operation.
*
* \note Blinding is used if and only if a PRNG is provided.
*
* \note If blinding is used, both the base of exponentation
* and the exponent are blinded, providing protection
* against some side-channel attacks.
*
* \warning It is deprecated and a security risk to not provide
* a PRNG here and thereby prevent the use of blinding.
* Future versions of the library may enforce the presence
* of a PRNG.
*
* \param ctx The initialized RSA context to use.
* \param f_rng The RNG function, used for blinding. It is discouraged
* and deprecated to pass \c NULL here, in which case
* blinding will be omitted.
* \param p_rng The RNG context to pass to \p f_rng. This may be \c NULL
* if \p f_rng is \c NULL or if \p f_rng doesn't need a context.
* \param input The input buffer. This must be a readable buffer
* of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
* \param output The output buffer. This must be a writable buffer
* of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*
*/
int mbedtls_rsa_private( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
const unsigned char *input,
unsigned char *output );
/**
* \brief This function adds the message padding, then performs an RSA
* operation.
*
* It is the generic wrapper for performing a PKCS#1 encryption
* operation using the \p mode from the context.
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* implicitly set to #MBEDTLS_RSA_PUBLIC.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PRIVATE and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA context to use.
* \param f_rng The RNG to use. It is mandatory for PKCS#1 v2.1 padding
* encoding, and for PKCS#1 v1.5 padding encoding when used
* with \p mode set to #MBEDTLS_RSA_PUBLIC. For PKCS#1 v1.5
* padding encoding and \p mode set to #MBEDTLS_RSA_PRIVATE,
* it is used for blinding and should be provided in this
* case; see mbedtls_rsa_private() for more.
* \param p_rng The RNG context to be passed to \p f_rng. May be
* \c NULL if \p f_rng is \c NULL or if \p f_rng doesn't
* need a context argument.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE (deprecated).
* \param ilen The length of the plaintext in Bytes.
* \param input The input data to encrypt. This must be a readable
* buffer of size \p ilen Bytes. It may be \c NULL if
* `ilen == 0`.
* \param output The output buffer. This must be a writable buffer
* of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_pkcs1_encrypt( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode, size_t ilen,
const unsigned char *input,
unsigned char *output );
/**
* \brief This function performs a PKCS#1 v1.5 encryption operation
* (RSAES-PKCS1-v1_5-ENCRYPT).
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* implicitly set to #MBEDTLS_RSA_PUBLIC.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PRIVATE and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA context to use.
* \param f_rng The RNG function to use. It is needed for padding generation
* if \p mode is #MBEDTLS_RSA_PUBLIC. If \p mode is
* #MBEDTLS_RSA_PRIVATE (discouraged), it is used for
* blinding and should be provided; see mbedtls_rsa_private().
* \param p_rng The RNG context to be passed to \p f_rng. This may
* be \c NULL if \p f_rng is \c NULL or if \p f_rng
* doesn't need a context argument.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE (deprecated).
* \param ilen The length of the plaintext in Bytes.
* \param input The input data to encrypt. This must be a readable
* buffer of size \p ilen Bytes. It may be \c NULL if
* `ilen == 0`.
* \param output The output buffer. This must be a writable buffer
* of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_rsaes_pkcs1_v15_encrypt( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode, size_t ilen,
const unsigned char *input,
unsigned char *output );
/**
* \brief This function performs a PKCS#1 v2.1 OAEP encryption
* operation (RSAES-OAEP-ENCRYPT).
*
* \note The output buffer must be as large as the size
* of ctx->N. For example, 128 Bytes if RSA-1024 is used.
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* implicitly set to #MBEDTLS_RSA_PUBLIC.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PRIVATE and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initnialized RSA context to use.
* \param f_rng The RNG function to use. This is needed for padding
* generation and must be provided.
* \param p_rng The RNG context to be passed to \p f_rng. This may
* be \c NULL if \p f_rng doesn't need a context argument.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE (deprecated).
* \param label The buffer holding the custom label to use.
* This must be a readable buffer of length \p label_len
* Bytes. It may be \c NULL if \p label_len is \c 0.
* \param label_len The length of the label in Bytes.
* \param ilen The length of the plaintext buffer \p input in Bytes.
* \param input The input data to encrypt. This must be a readable
* buffer of size \p ilen Bytes. It may be \c NULL if
* `ilen == 0`.
* \param output The output buffer. This must be a writable buffer
* of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_rsaes_oaep_encrypt( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
const unsigned char *label, size_t label_len,
size_t ilen,
const unsigned char *input,
unsigned char *output );
/**
* \brief This function performs an RSA operation, then removes the
* message padding.
*
* It is the generic wrapper for performing a PKCS#1 decryption
* operation using the \p mode from the context.
*
* \note The output buffer length \c output_max_len should be
* as large as the size \p ctx->len of \p ctx->N (for example,
* 128 Bytes if RSA-1024 is used) to be able to hold an
* arbitrary decrypted message. If it is not large enough to
* hold the decryption of the particular ciphertext provided,
* the function returns \c MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE.
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* implicitly set to #MBEDTLS_RSA_PRIVATE.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PUBLIC and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA context to use.
* \param f_rng The RNG function. If \p mode is #MBEDTLS_RSA_PRIVATE,
* this is used for blinding and should be provided; see
* mbedtls_rsa_private() for more. If \p mode is
* #MBEDTLS_RSA_PUBLIC, it is ignored.
* \param p_rng The RNG context to be passed to \p f_rng. This may be
* \c NULL if \p f_rng is \c NULL or doesn't need a context.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PRIVATE or #MBEDTLS_RSA_PUBLIC (deprecated).
* \param olen The address at which to store the length of
* the plaintext. This must not be \c NULL.
* \param input The ciphertext buffer. This must be a readable buffer
* of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
* \param output The buffer used to hold the plaintext. This must
* be a writable buffer of length \p output_max_len Bytes.
* \param output_max_len The length in Bytes of the output buffer \p output.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_pkcs1_decrypt( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode, size_t *olen,
const unsigned char *input,
unsigned char *output,
size_t output_max_len );
/**
* \brief This function performs a PKCS#1 v1.5 decryption
* operation (RSAES-PKCS1-v1_5-DECRYPT).
*
* \note The output buffer length \c output_max_len should be
* as large as the size \p ctx->len of \p ctx->N, for example,
* 128 Bytes if RSA-1024 is used, to be able to hold an
* arbitrary decrypted message. If it is not large enough to
* hold the decryption of the particular ciphertext provided,
* the function returns #MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE.
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* implicitly set to #MBEDTLS_RSA_PRIVATE.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PUBLIC and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA context to use.
* \param f_rng The RNG function. If \p mode is #MBEDTLS_RSA_PRIVATE,
* this is used for blinding and should be provided; see
* mbedtls_rsa_private() for more. If \p mode is
* #MBEDTLS_RSA_PUBLIC, it is ignored.
* \param p_rng The RNG context to be passed to \p f_rng. This may be
* \c NULL if \p f_rng is \c NULL or doesn't need a context.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PRIVATE or #MBEDTLS_RSA_PUBLIC (deprecated).
* \param olen The address at which to store the length of
* the plaintext. This must not be \c NULL.
* \param input The ciphertext buffer. This must be a readable buffer
* of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
* \param output The buffer used to hold the plaintext. This must
* be a writable buffer of length \p output_max_len Bytes.
* \param output_max_len The length in Bytes of the output buffer \p output.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*
*/
int mbedtls_rsa_rsaes_pkcs1_v15_decrypt( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode, size_t *olen,
const unsigned char *input,
unsigned char *output,
size_t output_max_len );
/**
* \brief This function performs a PKCS#1 v2.1 OAEP decryption
* operation (RSAES-OAEP-DECRYPT).
*
* \note The output buffer length \c output_max_len should be
* as large as the size \p ctx->len of \p ctx->N, for
* example, 128 Bytes if RSA-1024 is used, to be able to
* hold an arbitrary decrypted message. If it is not
* large enough to hold the decryption of the particular
* ciphertext provided, the function returns
* #MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE.
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* implicitly set to #MBEDTLS_RSA_PRIVATE.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PUBLIC and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA context to use.
* \param f_rng The RNG function. If \p mode is #MBEDTLS_RSA_PRIVATE,
* this is used for blinding and should be provided; see
* mbedtls_rsa_private() for more. If \p mode is
* #MBEDTLS_RSA_PUBLIC, it is ignored.
* \param p_rng The RNG context to be passed to \p f_rng. This may be
* \c NULL if \p f_rng is \c NULL or doesn't need a context.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PRIVATE or #MBEDTLS_RSA_PUBLIC (deprecated).
* \param label The buffer holding the custom label to use.
* This must be a readable buffer of length \p label_len
* Bytes. It may be \c NULL if \p label_len is \c 0.
* \param label_len The length of the label in Bytes.
* \param olen The address at which to store the length of
* the plaintext. This must not be \c NULL.
* \param input The ciphertext buffer. This must be a readable buffer
* of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
* \param output The buffer used to hold the plaintext. This must
* be a writable buffer of length \p output_max_len Bytes.
* \param output_max_len The length in Bytes of the output buffer \p output.
*
* \return \c 0 on success.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_rsaes_oaep_decrypt( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
const unsigned char *label, size_t label_len,
size_t *olen,
const unsigned char *input,
unsigned char *output,
size_t output_max_len );
/**
* \brief This function performs a private RSA operation to sign
* a message digest using PKCS#1.
*
* It is the generic wrapper for performing a PKCS#1
* signature using the \p mode from the context.
*
* \note The \p sig buffer must be as large as the size
* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used.
*
* \note For PKCS#1 v2.1 encoding, see comments on
* mbedtls_rsa_rsassa_pss_sign() for details on
* \p md_alg and \p hash_id.
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* implicitly set to #MBEDTLS_RSA_PRIVATE.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PUBLIC and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA context to use.
* \param f_rng The RNG function to use. If the padding mode is PKCS#1 v2.1,
* this must be provided. If the padding mode is PKCS#1 v1.5 and
* \p mode is #MBEDTLS_RSA_PRIVATE, it is used for blinding
* and should be provided; see mbedtls_rsa_private() for more
* more. It is ignored otherwise.
* \param p_rng The RNG context to be passed to \p f_rng. This may be \c NULL
* if \p f_rng is \c NULL or doesn't need a context argument.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PRIVATE or #MBEDTLS_RSA_PUBLIC (deprecated).
* \param md_alg The message-digest algorithm used to hash the original data.
* Use #MBEDTLS_MD_NONE for signing raw data.
* \param hashlen The length of the message digest.
* Ths is only used if \p md_alg is #MBEDTLS_MD_NONE.
* \param hash The buffer holding the message digest or raw data.
* If \p md_alg is #MBEDTLS_MD_NONE, this must be a readable
* buffer of length \p hashlen Bytes. If \p md_alg is not
* #MBEDTLS_MD_NONE, it must be a readable buffer of length
* the size of the hash corresponding to \p md_alg.
* \param sig The buffer to hold the signature. This must be a writable
* buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \return \c 0 if the signing operation was successful.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_pkcs1_sign( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
mbedtls_md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig );
/**
* \brief This function performs a PKCS#1 v1.5 signature
* operation (RSASSA-PKCS1-v1_5-SIGN).
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* implicitly set to #MBEDTLS_RSA_PRIVATE.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PUBLIC and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA context to use.
* \param f_rng The RNG function. If \p mode is #MBEDTLS_RSA_PRIVATE,
* this is used for blinding and should be provided; see
* mbedtls_rsa_private() for more. If \p mode is
* #MBEDTLS_RSA_PUBLIC, it is ignored.
* \param p_rng The RNG context to be passed to \p f_rng. This may be \c NULL
* if \p f_rng is \c NULL or doesn't need a context argument.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PRIVATE or #MBEDTLS_RSA_PUBLIC (deprecated).
* \param md_alg The message-digest algorithm used to hash the original data.
* Use #MBEDTLS_MD_NONE for signing raw data.
* \param hashlen The length of the message digest.
* Ths is only used if \p md_alg is #MBEDTLS_MD_NONE.
* \param hash The buffer holding the message digest or raw data.
* If \p md_alg is #MBEDTLS_MD_NONE, this must be a readable
* buffer of length \p hashlen Bytes. If \p md_alg is not
* #MBEDTLS_MD_NONE, it must be a readable buffer of length
* the size of the hash corresponding to \p md_alg.
* \param sig The buffer to hold the signature. This must be a writable
* buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \return \c 0 if the signing operation was successful.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_rsassa_pkcs1_v15_sign( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
mbedtls_md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig );
/**
* \brief This function performs a PKCS#1 v2.1 PSS signature
* operation (RSASSA-PSS-SIGN).
*
* \note The \p hash_id in the RSA context is the one used for the
* encoding. \p md_alg in the function call is the type of hash
* that is encoded. According to <em>RFC-3447: Public-Key
* Cryptography Standards (PKCS) #1 v2.1: RSA Cryptography
* Specifications</em> it is advised to keep both hashes the
* same.
*
* \note This function always uses the maximum possible salt size,
* up to the length of the payload hash. This choice of salt
* size complies with FIPS 186-4 §5.5 (e) and RFC 8017 (PKCS#1
* v2.2) §9.1.1 step 3. Furthermore this function enforces a
* minimum salt size which is the hash size minus 2 bytes. If
* this minimum size is too large given the key size (the salt
* size, plus the hash size, plus 2 bytes must be no more than
* the key size in bytes), this function returns
* #MBEDTLS_ERR_RSA_BAD_INPUT_DATA.
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PUBLIC mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* implicitly set to #MBEDTLS_RSA_PRIVATE.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PUBLIC and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA context to use.
* \param f_rng The RNG function. It must not be \c NULL.
* \param p_rng The RNG context to be passed to \p f_rng. This may be \c NULL
* if \p f_rng doesn't need a context argument.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PRIVATE or #MBEDTLS_RSA_PUBLIC (deprecated).
* \param md_alg The message-digest algorithm used to hash the original data.
* Use #MBEDTLS_MD_NONE for signing raw data.
* \param hashlen The length of the message digest.
* Ths is only used if \p md_alg is #MBEDTLS_MD_NONE.
* \param hash The buffer holding the message digest or raw data.
* If \p md_alg is #MBEDTLS_MD_NONE, this must be a readable
* buffer of length \p hashlen Bytes. If \p md_alg is not
* #MBEDTLS_MD_NONE, it must be a readable buffer of length
* the size of the hash corresponding to \p md_alg.
* \param sig The buffer to hold the signature. This must be a writable
* buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \return \c 0 if the signing operation was successful.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_rsassa_pss_sign( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
mbedtls_md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
unsigned char *sig );
/**
* \brief This function performs a public RSA operation and checks
* the message digest.
*
* This is the generic wrapper for performing a PKCS#1
* verification using the mode from the context.
*
* \note For PKCS#1 v2.1 encoding, see comments on
* mbedtls_rsa_rsassa_pss_verify() about \p md_alg and
* \p hash_id.
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* set to #MBEDTLS_RSA_PUBLIC.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PRIVATE and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA public key context to use.
* \param f_rng The RNG function to use. If \p mode is #MBEDTLS_RSA_PRIVATE,
* this is used for blinding and should be provided; see
* mbedtls_rsa_private() for more. Otherwise, it is ignored.
* \param p_rng The RNG context to be passed to \p f_rng. This may be
* \c NULL if \p f_rng is \c NULL or doesn't need a context.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE (deprecated).
* \param md_alg The message-digest algorithm used to hash the original data.
* Use #MBEDTLS_MD_NONE for signing raw data.
* \param hashlen The length of the message digest.
* This is only used if \p md_alg is #MBEDTLS_MD_NONE.
* \param hash The buffer holding the message digest or raw data.
* If \p md_alg is #MBEDTLS_MD_NONE, this must be a readable
* buffer of length \p hashlen Bytes. If \p md_alg is not
* #MBEDTLS_MD_NONE, it must be a readable buffer of length
* the size of the hash corresponding to \p md_alg.
* \param sig The buffer holding the signature. This must be a readable
* buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \return \c 0 if the verify operation was successful.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_pkcs1_verify( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
mbedtls_md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
const unsigned char *sig );
/**
* \brief This function performs a PKCS#1 v1.5 verification
* operation (RSASSA-PKCS1-v1_5-VERIFY).
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* set to #MBEDTLS_RSA_PUBLIC.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PRIVATE and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA public key context to use.
* \param f_rng The RNG function to use. If \p mode is #MBEDTLS_RSA_PRIVATE,
* this is used for blinding and should be provided; see
* mbedtls_rsa_private() for more. Otherwise, it is ignored.
* \param p_rng The RNG context to be passed to \p f_rng. This may be
* \c NULL if \p f_rng is \c NULL or doesn't need a context.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE (deprecated).
* \param md_alg The message-digest algorithm used to hash the original data.
* Use #MBEDTLS_MD_NONE for signing raw data.
* \param hashlen The length of the message digest.
* This is only used if \p md_alg is #MBEDTLS_MD_NONE.
* \param hash The buffer holding the message digest or raw data.
* If \p md_alg is #MBEDTLS_MD_NONE, this must be a readable
* buffer of length \p hashlen Bytes. If \p md_alg is not
* #MBEDTLS_MD_NONE, it must be a readable buffer of length
* the size of the hash corresponding to \p md_alg.
* \param sig The buffer holding the signature. This must be a readable
* buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \return \c 0 if the verify operation was successful.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_rsassa_pkcs1_v15_verify( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
mbedtls_md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
const unsigned char *sig );
/**
* \brief This function performs a PKCS#1 v2.1 PSS verification
* operation (RSASSA-PSS-VERIFY).
*
* The hash function for the MGF mask generating function
* is that specified in the RSA context.
*
* \note The \p hash_id in the RSA context is the one used for the
* verification. \p md_alg in the function call is the type of
* hash that is verified. According to <em>RFC-3447: Public-Key
* Cryptography Standards (PKCS) #1 v2.1: RSA Cryptography
* Specifications</em> it is advised to keep both hashes the
* same. If \p hash_id in the RSA context is unset,
* the \p md_alg from the function call is used.
*
* \deprecated It is deprecated and discouraged to call this function
* in #MBEDTLS_RSA_PRIVATE mode. Future versions of the library
* are likely to remove the \p mode argument and have it
* implicitly set to #MBEDTLS_RSA_PUBLIC.
*
* \note Alternative implementations of RSA need not support
* mode being set to #MBEDTLS_RSA_PRIVATE and might instead
* return #MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED.
*
* \param ctx The initialized RSA public key context to use.
* \param f_rng The RNG function to use. If \p mode is #MBEDTLS_RSA_PRIVATE,
* this is used for blinding and should be provided; see
* mbedtls_rsa_private() for more. Otherwise, it is ignored.
* \param p_rng The RNG context to be passed to \p f_rng. This may be
* \c NULL if \p f_rng is \c NULL or doesn't need a context.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE (deprecated).
* \param md_alg The message-digest algorithm used to hash the original data.
* Use #MBEDTLS_MD_NONE for signing raw data.
* \param hashlen The length of the message digest.
* This is only used if \p md_alg is #MBEDTLS_MD_NONE.
* \param hash The buffer holding the message digest or raw data.
* If \p md_alg is #MBEDTLS_MD_NONE, this must be a readable
* buffer of length \p hashlen Bytes. If \p md_alg is not
* #MBEDTLS_MD_NONE, it must be a readable buffer of length
* the size of the hash corresponding to \p md_alg.
* \param sig The buffer holding the signature. This must be a readable
* buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \return \c 0 if the verify operation was successful.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_rsassa_pss_verify( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
mbedtls_md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
const unsigned char *sig );
/**
* \brief This function performs a PKCS#1 v2.1 PSS verification
* operation (RSASSA-PSS-VERIFY).
*
* The hash function for the MGF mask generating function
* is that specified in \p mgf1_hash_id.
*
* \note The \p sig buffer must be as large as the size
* of \p ctx->N. For example, 128 Bytes if RSA-1024 is used.
*
* \note The \p hash_id in the RSA context is ignored.
*
* \param ctx The initialized RSA public key context to use.
* \param f_rng The RNG function to use. If \p mode is #MBEDTLS_RSA_PRIVATE,
* this is used for blinding and should be provided; see
* mbedtls_rsa_private() for more. Otherwise, it is ignored.
* \param p_rng The RNG context to be passed to \p f_rng. This may be
* \c NULL if \p f_rng is \c NULL or doesn't need a context.
* \param mode The mode of operation. This must be either
* #MBEDTLS_RSA_PUBLIC or #MBEDTLS_RSA_PRIVATE.
* \param md_alg The message-digest algorithm used to hash the original data.
* Use #MBEDTLS_MD_NONE for signing raw data.
* \param hashlen The length of the message digest.
* This is only used if \p md_alg is #MBEDTLS_MD_NONE.
* \param hash The buffer holding the message digest or raw data.
* If \p md_alg is #MBEDTLS_MD_NONE, this must be a readable
* buffer of length \p hashlen Bytes. If \p md_alg is not
* #MBEDTLS_MD_NONE, it must be a readable buffer of length
* the size of the hash corresponding to \p md_alg.
* \param mgf1_hash_id The message digest used for mask generation.
* \param expected_salt_len The length of the salt used in padding. Use
* #MBEDTLS_RSA_SALT_LEN_ANY to accept any salt length.
* \param sig The buffer holding the signature. This must be a readable
* buffer of length \c ctx->len Bytes. For example, \c 256 Bytes
* for an 2048-bit RSA modulus.
*
* \return \c 0 if the verify operation was successful.
* \return An \c MBEDTLS_ERR_RSA_XXX error code on failure.
*/
int mbedtls_rsa_rsassa_pss_verify_ext( mbedtls_rsa_context *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng,
int mode,
mbedtls_md_type_t md_alg,
unsigned int hashlen,
const unsigned char *hash,
mbedtls_md_type_t mgf1_hash_id,
int expected_salt_len,
const unsigned char *sig );
/**
* \brief This function copies the components of an RSA context.
*
* \param dst The destination context. This must be initialized.
* \param src The source context. This must be initialized.
*
* \return \c 0 on success.
* \return #MBEDTLS_ERR_MPI_ALLOC_FAILED on memory allocation failure.
*/
int mbedtls_rsa_copy( mbedtls_rsa_context *dst, const mbedtls_rsa_context *src );
/**
* \brief This function frees the components of an RSA key.
*
* \param ctx The RSA context to free. May be \c NULL, in which case
* this function is a no-op. If it is not \c NULL, it must
* point to an initialized RSA context.
*/
void mbedtls_rsa_free( mbedtls_rsa_context *ctx );
#if defined(MBEDTLS_SELF_TEST)
/**
* \brief The RSA checkup routine.
*
* \return \c 0 on success.
* \return \c 1 on failure.
*/
int mbedtls_rsa_self_test( int verbose );
#endif /* MBEDTLS_SELF_TEST */
#ifdef __cplusplus
}
#endif
#endif /* rsa.h */
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