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Update LMS API to support multiple parameter sets

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Parameterise macros to allow variation of sizes

Signed-off-by: Raef Coles <raef.coles@arm.com>
This commit is contained in:
Raef Coles
2022-09-01 16:06:35 +01:00
parent ab4f87413a
commit e9479a0264
6 changed files with 226 additions and 161 deletions
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29
library/lmots.h
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@ -33,18 +33,25 @@
#include <stdint.h>
#include <stddef.h>
#define MBEDTLS_LMOTS_N_HASH_LEN (32)
#define MBEDTLS_LMOTS_P_SIG_DIGIT_COUNT (34)
#define MBEDTLS_LMOTS_TYPE_LEN (4)
#define MBEDTLS_LMOTS_C_RANDOM_VALUE_LEN (MBEDTLS_LMOTS_N_HASH_LEN)
#define MBEDTLS_LMOTS_I_KEY_ID_LEN (16)
#define MBEDTLS_LMOTS_Q_LEAF_ID_LEN (4)
/* Currently only defined for SHA256, 32 is the max hash output size */
#define MBEDTLS_LMOTS_N_HASH_LEN_MAX (32u)
#define MBEDTLS_LMOTS_P_SIG_DIGIT_COUNT_MAX (34u)
#define MBEDTLS_LMOTS_N_HASH_LEN(type) (type == MBEDTLS_LMOTS_SHA256_N32_W8 ? 32u : 0)
#define MBEDTLS_LMOTS_P_SIG_DIGIT_COUNT(type) (type == MBEDTLS_LMOTS_SHA256_N32_W8 ? 34u : 0)
#define MBEDTLS_LMOTS_C_RANDOM_VALUE_LEN(type) (MBEDTLS_LMOTS_N_HASH_LEN(type))
#define MBEDTLS_LMOTS_TYPE_LEN (4u)
#define MBEDTLS_LMOTS_I_KEY_ID_LEN (16u)
#define MBEDTLS_LMOTS_Q_LEAF_ID_LEN (4u)
#define MBEDTLS_LMOTS_SIG_LEN (MBEDTLS_LMOTS_TYPE_LEN + MBEDTLS_LMOTS_C_RANDOM_VALUE_LEN + \
(MBEDTLS_LMOTS_P_SIG_DIGIT_COUNT * MBEDTLS_LMOTS_N_HASH_LEN))
#define MBEDTLS_LMOTS_SIG_LEN(type) (MBEDTLS_LMOTS_TYPE_LEN + \
MBEDTLS_LMOTS_C_RANDOM_VALUE_LEN(type) + \
(MBEDTLS_LMOTS_P_SIG_DIGIT_COUNT(type) * \
MBEDTLS_LMOTS_N_HASH_LEN(type)))
#define MBEDTLS_LMOTS_PUBLIC_KEY_LEN (MBEDTLS_LMOTS_TYPE_LEN + MBEDTLS_LMOTS_I_KEY_ID_LEN + \
MBEDTLS_LMOTS_Q_LEAF_ID_LEN + MBEDTLS_LMOTS_N_HASH_LEN)
#define MBEDTLS_LMOTS_PUBLIC_KEY_LEN(type) (MBEDTLS_LMOTS_TYPE_LEN + \
MBEDTLS_LMOTS_I_KEY_ID_LEN + \
MBEDTLS_LMOTS_Q_LEAF_ID_LEN + \
MBEDTLS_LMOTS_N_HASH_LEN(type))
#define MBEDTLS_LMOTS_SIG_TYPE_OFFSET (0)
@ -121,7 +128,7 @@ typedef struct {
*/
typedef struct {
mbedtls_lmots_parameters_t MBEDTLS_PRIVATE(params);
unsigned char MBEDTLS_PRIVATE(private_key)[MBEDTLS_LMOTS_P_SIG_DIGIT_COUNT][32];
unsigned char MBEDTLS_PRIVATE(private_key)[MBEDTLS_LMOTS_P_SIG_DIGIT_COUNT_MAX][32];
unsigned char MBEDTLS_PRIVATE(have_private_key); /*!< Whether the context contains a private key.
Boolean values only. */
} mbedtls_lmots_private_t;