diff options
Diffstat (limited to 'ecdsa.c')
| -rw-r--r-- | ecdsa.c | 113 |
1 files changed, 6 insertions, 107 deletions
@@ -1345,87 +1345,13 @@ static hal_error_t decode_signature_pkcs11(const ecdsa_curve_t * const curve, } /* - * Encode a signature in ASN.1 format SEQUENCE { INTEGER r, INTEGER s }. - */ - -static hal_error_t encode_signature_asn1(const ecdsa_curve_t * const curve, - const fp_int * const r, const fp_int * const s, - uint8_t *signature, size_t *signature_len, const size_t signature_max) -{ - assert(curve != NULL && r != NULL && s != NULL); - - size_t hlen, r_len, s_len; - hal_error_t err; - - if ((err = hal_asn1_encode_integer(r, NULL, &r_len, 0)) != HAL_OK || - (err = hal_asn1_encode_integer(s, NULL, &s_len, 0)) != HAL_OK) - return err; - - const size_t vlen = r_len + s_len; - - err = hal_asn1_encode_header(ASN1_SEQUENCE, vlen, signature, &hlen, signature_max); - - if (signature_len != NULL) - *signature_len = hlen + vlen; - - if (signature == NULL || err != HAL_OK) - return err; - - uint8_t * const r_out = signature + hlen; - uint8_t * const s_out = r_out + r_len; - - if ((err = hal_asn1_encode_integer(r, r_out, NULL, signature_max - (r_out - signature))) != HAL_OK || - (err = hal_asn1_encode_integer(s, s_out, NULL, signature_max - (s_out - signature))) != HAL_OK) - return err; - - return HAL_OK; -} - -/* - * Decode a signature from ASN.1 format SEQUENCE { INTEGER r, INTEGER s }. - */ - -static hal_error_t decode_signature_asn1(const ecdsa_curve_t * const curve, - fp_int *r, fp_int *s, - const uint8_t * const signature, const size_t signature_len) -{ - assert(curve != NULL && r != NULL && s != NULL); - - if (signature == NULL) - return HAL_ERROR_BAD_ARGUMENTS; - - size_t len1, len2; - hal_error_t err; - - if ((err = hal_asn1_decode_header(ASN1_SEQUENCE, signature, signature_len, &len1, &len2)) != HAL_OK) - return err; - - const uint8_t * der = signature + len1; - const uint8_t * const der_end = der + len2; - - if ((err = hal_asn1_decode_integer(r, der, &len1, der_end - der)) != HAL_OK) - return err; - der += len1; - - if ((err = hal_asn1_decode_integer(s, der, &len1, der_end - der)) != HAL_OK) - return err; - der += len1; - - if (der != der_end) - return HAL_ERROR_ASN1_PARSE_FAILED; - - return HAL_OK; -} - -/* * Sign a caller-supplied hash. */ hal_error_t hal_ecdsa_sign(const hal_core_t *core, const hal_ecdsa_key_t * const key, const uint8_t * const hash, const size_t hash_len, - uint8_t *signature, size_t *signature_len, const size_t signature_max, - const hal_ecdsa_signature_format_t signature_format) + uint8_t *signature, size_t *signature_len, const size_t signature_max) { if (key == NULL || hash == NULL || signature == NULL || signature_len == NULL || key->type != HAL_KEY_TYPE_EC_PRIVATE) return HAL_ERROR_BAD_ARGUMENTS; @@ -1487,21 +1413,8 @@ hal_error_t hal_ecdsa_sign(const hal_core_t *core, * Encode the signature, then we're done. */ - switch (signature_format) { - - case HAL_ECDSA_SIGNATURE_FORMAT_ASN1: - if ((err = encode_signature_asn1(curve, r, s, signature, signature_len, signature_max)) != HAL_OK) - goto fail; - break; - - case HAL_ECDSA_SIGNATURE_FORMAT_PKCS11: - if ((err = encode_signature_pkcs11(curve, r, s, signature, signature_len, signature_max)) != HAL_OK) - goto fail; - break; - - default: - lose(HAL_ERROR_BAD_ARGUMENTS); - } + if ((err = encode_signature_pkcs11(curve, r, s, signature, signature_len, signature_max)) != HAL_OK) + goto fail; err = HAL_OK; @@ -1518,8 +1431,7 @@ hal_error_t hal_ecdsa_sign(const hal_core_t *core, hal_error_t hal_ecdsa_verify(const hal_core_t *core, const hal_ecdsa_key_t * const key, const uint8_t * const hash, const size_t hash_len, - const uint8_t * const signature, const size_t signature_len, - const hal_ecdsa_signature_format_t signature_format) + const uint8_t * const signature, const size_t signature_len) { assert(key != NULL && hash != NULL && signature != NULL); @@ -1551,21 +1463,8 @@ hal_error_t hal_ecdsa_verify(const hal_core_t *core, * Start by decoding the signature. */ - switch (signature_format) { - - case HAL_ECDSA_SIGNATURE_FORMAT_ASN1: - if ((err = decode_signature_asn1(curve, r, s, signature, signature_len)) != HAL_OK) - return err; - break; - - case HAL_ECDSA_SIGNATURE_FORMAT_PKCS11: - if ((err = decode_signature_pkcs11(curve, r, s, signature, signature_len)) != HAL_OK) - return err; - break; - - default: - return HAL_ERROR_BAD_ARGUMENTS; - } + if ((err = decode_signature_pkcs11(curve, r, s, signature, signature_len)) != HAL_OK) + return err; /* * Check that r and s are in the allowed range, read the hash, then |