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Document LMS and LMOTS contexts

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And add some comments about the source of their type IDs

Signed-off-by: Raef Coles <raef.coles@arm.com>
This commit is contained in:
Raef Coles 2022-06-15 12:17:51 +01:00
parent 8ff6df538c
commit c464746d45
No known key found for this signature in database
GPG Key ID: 1AAF1B43DF2086F4
2 changed files with 42 additions and 18 deletions
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31
include/mbedtls/lmots.h
View File

@ -59,8 +59,8 @@
extern "C" {
#endif
/* We are only implementing a subset of the types, particularly n32_w8, for the
* sake of simplicty
/* https://www.iana.org/assignments/leighton-micali-signatures/leighton-micali-signatures.xhtml
* We are only implementing a subset of the types, particularly n32_w8, for the sake of simplicty.
*/
typedef enum {
MBEDTLS_LMOTS_SHA256_N32_W8 = 4
@ -68,14 +68,25 @@ typedef enum {
typedef struct {
unsigned char MBEDTLS_PRIVATE(have_privkey);
unsigned char MBEDTLS_PRIVATE(have_pubkey);
unsigned char MBEDTLS_PRIVATE(I_key_identifier[MBEDTLS_LMOTS_I_KEY_ID_LEN]);
unsigned int MBEDTLS_PRIVATE(q_leaf_identifier);
unsigned char MBEDTLS_PRIVATE(q_leaf_identifier_bytes)[MBEDTLS_LMOTS_Q_LEAF_ID_LEN];
mbedtls_lmots_algorithm_type_t MBEDTLS_PRIVATE(type);
unsigned char MBEDTLS_PRIVATE(priv_key[MBEDTLS_LMOTS_P_SIG_SYMBOL_LEN][32]);
unsigned char MBEDTLS_PRIVATE(pub_key[32]);
unsigned char MBEDTLS_PRIVATE(have_privkey); /*!< Whether the context contains a private key.
Boolean values only. */
unsigned char MBEDTLS_PRIVATE(have_pubkey); /*!< Whether the context contains a public key.
Boolean values only. */
unsigned char MBEDTLS_PRIVATE(I_key_identifier[MBEDTLS_LMOTS_I_KEY_ID_LEN]); /*!< The key
identifier. */
unsigned int MBEDTLS_PRIVATE(q_leaf_identifier); /*!< Which leaf of the LMS key this is.
0 if the key is not part of an LMS key. */
unsigned char MBEDTLS_PRIVATE(q_leaf_identifier_bytes)[MBEDTLS_LMOTS_Q_LEAF_ID_LEN];/*!< The
leaf identifier in network bytes form. */
mbedtls_lmots_algorithm_type_t MBEDTLS_PRIVATE(type); /*!< The LM-OTS key type identifier as
per IANA. Only SHA256_N32_W8 is currently
supported. */
unsigned char MBEDTLS_PRIVATE(priv_key[MBEDTLS_LMOTS_P_SIG_SYMBOL_LEN][32]); /*!< The private
key, one hash output per byte of the encoded
symbol string P (32 bytes of hash output +
2 bytes of checksum). */
unsigned char MBEDTLS_PRIVATE(pub_key[32]); /*!< The public key, in the form of a SHA256
output. */
} mbedtls_lmots_context;

29
include/mbedtls/lms.h
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@ -58,20 +58,33 @@
extern "C" {
#endif
/* https://www.iana.org/assignments/leighton-micali-signatures/leighton-micali-signatures.xhtml
* We are only implementing a subset of the types, particularly H10, for the sake of simplicty.
*/
typedef enum {
MBEDTLS_LMS_SHA256_M32_H10 = 0x6,
} mbedtls_lms_algorithm_type_t;
typedef struct {
unsigned char MBEDTLS_PRIVATE(have_privkey);
unsigned char MBEDTLS_PRIVATE(have_pubkey);
unsigned char MBEDTLS_PRIVATE(I_key_identifier)[MBEDTLS_LMOTS_I_KEY_ID_LEN];
mbedtls_lms_algorithm_type_t MBEDTLS_PRIVATE(type);
mbedtls_lmots_algorithm_type_t MBEDTLS_PRIVATE(otstype);
unsigned int MBEDTLS_PRIVATE(q_next_usable_key);
mbedtls_lmots_context *MBEDTLS_PRIVATE(priv_keys);
unsigned char MBEDTLS_PRIVATE(T_1_pub_key)[MBEDTLS_LMS_M_NODE_BYTES];
unsigned char MBEDTLS_PRIVATE(have_privkey); /*!< Whether the context contains a private key.
Boolean values only. */
unsigned char MBEDTLS_PRIVATE(have_pubkey); /*!< Whether the context contains a public key.
Boolean values only. */
unsigned char MBEDTLS_PRIVATE(I_key_identifier)[MBEDTLS_LMOTS_I_KEY_ID_LEN]; /*!< The key
identifier. */
mbedtls_lms_algorithm_type_t MBEDTLS_PRIVATE(type); /*!< The LMS key type identifier as per
IANA. Only SHA256_M32_H10 is currently
supported. */
mbedtls_lmots_algorithm_type_t MBEDTLS_PRIVATE(otstype); /*!< The LM-OTS key type identifier as
per IANA. Only SHA256_N32_W8 is currently
supported. */
unsigned int MBEDTLS_PRIVATE(q_next_usable_key); /*!< The index of the next OTS key that has not
been used. */
mbedtls_lmots_context *MBEDTLS_PRIVATE(priv_keys); /*!< The private key material. One OTS key
for each leaf node in the merkle tree. */
unsigned char MBEDTLS_PRIVATE(T_1_pub_key)[MBEDTLS_LMS_M_NODE_BYTES]; /*!< The public key, in
the form of the merkle tree root node. */
} mbedtls_lms_context;