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pk_wrap: optimize code for ECDSA sign

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Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
This commit is contained in:
Valerio Setti 2023-06-21 13:55:16 +02:00
parent 92a55bf5ea
commit 4657f10bdb
1 changed files with 94 additions and 63 deletions
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157
library/pk_wrap.c
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@ -920,6 +920,80 @@ static int pk_ecdsa_sig_asn1_from_psa(unsigned char *sig, size_t *sig_len,
return 0;
}
/* This is the common helper used by ecdsa_sign_wrap() functions below (they
* differ in having PK_USE_PSA_EC_DATA defined or not) to sign using PSA
* functions. */
static int ecdsa_sign_psa(mbedtls_svc_key_id_t key_id, psa_algorithm_t psa_sig_md,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len)
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
psa_status_t status;
status = psa_sign_hash(key_id, psa_sig_md, hash, hash_len,
sig, sig_size, sig_len);
if (status != PSA_SUCCESS) {
return PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
}
ret = pk_ecdsa_sig_asn1_from_psa(sig, sig_len, sig_size);
return ret;
}
/* The reason for having this duplicated compared to ecdsa_sign_wrap() below is
* that:
* - opaque keys are available as long as USE_PSA_CRYPTO is defined and even
* if !PK_USE_PSA_EC_DATA
* - opaque keys do not support PSA_ALG_DETERMINISTIC_ECDSA() */
static int ecdsa_sign_wrap_opaque(mbedtls_pk_context *pk,
mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size,
size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng)
{
((void) f_rng);
((void) p_rng);
psa_algorithm_t psa_sig_md =
PSA_ALG_ECDSA(mbedtls_md_psa_alg_from_type(md_alg));
if (MBEDTLS_SVC_KEY_ID_GET_KEY_ID(pk->priv_id) == PSA_KEY_ID_NULL) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
return ecdsa_sign_psa(pk->priv_id, psa_sig_md, hash, hash_len, sig, sig_size,
sig_len);
}
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
static int ecdsa_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
((void) f_rng);
((void) p_rng);
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
psa_algorithm_t psa_sig_md =
PSA_ALG_DETERMINISTIC_ECDSA(mbedtls_md_psa_alg_from_type(md_alg));
#else
psa_algorithm_t psa_sig_md =
PSA_ALG_ECDSA(mbedtls_md_psa_alg_from_type(md_alg));
#endif
if (pk->ec_family == 0) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
if (MBEDTLS_SVC_KEY_ID_GET_KEY_ID(pk->priv_id) == PSA_KEY_ID_NULL) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
return ecdsa_sign_psa(pk->priv_id, psa_sig_md, hash, hash_len, sig, sig_size,
sig_len);
}
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
static int ecdsa_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
@ -928,16 +1002,6 @@ static int ecdsa_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_status_t status;
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
psa_algorithm_t psa_sig_md =
PSA_ALG_DETERMINISTIC_ECDSA(mbedtls_md_psa_alg_from_type(md_alg));
#else
psa_algorithm_t psa_sig_md =
PSA_ALG_ECDSA(mbedtls_md_psa_alg_from_type(md_alg));
#endif
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
psa_ecc_family_t curve = pk->ec_family;
#else /* MBEDTLS_PK_USE_PSA_EC_DATA */
mbedtls_ecp_keypair *ctx = pk->pk_ctx;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
unsigned char buf[MBEDTLS_PSA_MAX_EC_KEY_PAIR_LENGTH];
@ -945,9 +1009,13 @@ static int ecdsa_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
psa_ecc_family_t curve =
mbedtls_ecc_group_to_psa(ctx->grp.id, &curve_bits);
size_t key_len = PSA_BITS_TO_BYTES(curve_bits);
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
/* PSA has its own RNG */
#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
psa_algorithm_t psa_sig_md =
PSA_ALG_DETERMINISTIC_ECDSA(mbedtls_md_psa_alg_from_type(md_alg));
#else
psa_algorithm_t psa_sig_md =
PSA_ALG_ECDSA(mbedtls_md_psa_alg_from_type(md_alg));
#endif
((void) f_rng);
((void) p_rng);
@ -955,12 +1023,6 @@ static int ecdsa_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
#if defined(MBEDTLS_PK_USE_PSA_EC_DATA)
if (MBEDTLS_SVC_KEY_ID_GET_KEY_ID(pk->priv_id) == PSA_KEY_ID_NULL) {
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
}
key_id = pk->priv_id;
#else
if (key_len > sizeof(buf)) {
return MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
}
@ -973,36 +1035,24 @@ static int ecdsa_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
psa_set_key_usage_flags(&attributes, PSA_KEY_USAGE_SIGN_HASH);
psa_set_key_algorithm(&attributes, psa_sig_md);
status = psa_import_key(&attributes,
buf, key_len,
&key_id);
status = psa_import_key(&attributes, buf, key_len, &key_id);
if (status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
goto cleanup;
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
status = psa_sign_hash(key_id, psa_sig_md, hash, hash_len,
sig, sig_size, sig_len);
if (status != PSA_SUCCESS) {
ret = PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
goto cleanup;
}
ret = pk_ecdsa_sig_asn1_from_psa(sig, sig_len, sig_size);
ret = ecdsa_sign_psa(key_id, psa_sig_md, hash, hash_len, sig, sig_size, sig_len);
cleanup:
#if !defined(MBEDTLS_PK_USE_PSA_EC_DATA)
mbedtls_platform_zeroize(buf, sizeof(buf));
status = psa_destroy_key(key_id);
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
if (ret == 0 && status != PSA_SUCCESS) {
ret = PSA_PK_TO_MBEDTLS_ERR(status);
}
return ret;
}
#endif /* MBEDTLS_PK_USE_PSA_EC_DATA */
#else /* MBEDTLS_USE_PSA_CRYPTO */
static int ecdsa_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
@ -1600,7 +1650,7 @@ static int pk_opaque_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng)
{
#if !defined(MBEDTLS_PK_CAN_ECDSA_SIGN) && !defined(MBEDTLS_RSA_C)
#if !defined(MBEDTLS_RSA_C)
((void) pk);
((void) md_alg);
((void) hash);
@ -1611,7 +1661,7 @@ static int pk_opaque_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
((void) f_rng);
((void) p_rng);
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
#else /* !MBEDTLS_PK_CAN_ECDSA_SIGN && !MBEDTLS_RSA_C */
#else /* !MBEDTLS_RSA_C */
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_algorithm_t alg;
psa_key_type_t type;
@ -1629,44 +1679,25 @@ static int pk_opaque_sign_wrap(mbedtls_pk_context *pk, mbedtls_md_type_t md_alg,
type = psa_get_key_type(&attributes);
psa_reset_key_attributes(&attributes);
#if defined(MBEDTLS_PK_CAN_ECDSA_SIGN)
if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(type)) {
alg = PSA_ALG_ECDSA(mbedtls_md_psa_alg_from_type(md_alg));
} else
#endif /* MBEDTLS_PK_CAN_ECDSA_SIGN */
#if defined(MBEDTLS_RSA_C)
if (PSA_KEY_TYPE_IS_RSA(type)) {
alg = PSA_ALG_RSA_PKCS1V15_SIGN(mbedtls_md_psa_alg_from_type(md_alg));
} else
#endif /* MBEDTLS_RSA_C */
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
} else {
return MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE;
}
/* make the signature */
status = psa_sign_hash(pk->priv_id, alg, hash, hash_len,
sig, sig_size, sig_len);
if (status != PSA_SUCCESS) {
#if defined(MBEDTLS_PK_CAN_ECDSA_SIGN)
if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(type)) {
return PSA_PK_ECDSA_TO_MBEDTLS_ERR(status);
} else
#endif /* MBEDTLS_PK_CAN_ECDSA_SIGN */
#if defined(MBEDTLS_RSA_C)
if (PSA_KEY_TYPE_IS_RSA(type)) {
return PSA_PK_RSA_TO_MBEDTLS_ERR(status);
} else
#endif /* MBEDTLS_RSA_C */
return PSA_PK_TO_MBEDTLS_ERR(status);
} else {
return PSA_PK_TO_MBEDTLS_ERR(status);
}
}
#if defined(MBEDTLS_PK_CAN_ECDSA_SIGN)
if (PSA_KEY_TYPE_IS_ECC_KEY_PAIR(type)) {
/* transcode it to ASN.1 sequence */
return pk_ecdsa_sig_asn1_from_psa(sig, sig_len, sig_size);
}
#endif /* MBEDTLS_PK_CAN_ECDSA_SIGN */
return 0;
#endif /* !MBEDTLS_PK_CAN_ECDSA_SIGN && !MBEDTLS_RSA_C */
#endif /* !MBEDTLS_RSA_C */
}
static int pk_opaque_ec_check_pair(mbedtls_pk_context *pub, mbedtls_pk_context *prv,
@ -1722,7 +1753,7 @@ const mbedtls_pk_info_t mbedtls_pk_ecdsa_opaque_info = {
pk_opaque_get_bitlen,
pk_opaque_ecdsa_can_do,
NULL, /* verify - will be done later */
pk_opaque_sign_wrap,
ecdsa_sign_wrap_opaque,
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
NULL, /* restartable verify - not relevant */
NULL, /* restartable sign - not relevant */