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Added ECDSA signature.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2022-04-21 23:28:26 +02:00
parent d69342d2d0
commit 0d2d7781a7
1 changed files with 40 additions and 1 deletions
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39
src/openpgp/openpgp.c
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@@ -832,6 +832,20 @@ int load_private_key_rsa(mbedtls_rsa_context *ctx, file_t *fkey) {
return CCID_OK; return CCID_OK;
} }
int load_private_key_ecdsa(mbedtls_ecdsa_context *ctx, file_t *fkey) {
//wait_button();
int key_size = file_read_uint16(fkey->data);
uint8_t kdata[67]; //Worst case, 521 bit + 1byte
memcpy(kdata, file_read(fkey->data+2), key_size);
mbedtls_ecp_group_id gid = kdata[0];
int r = mbedtls_ecp_read_key(gid, ctx, kdata+1, key_size-1);
if (r != 0) {
mbedtls_ecdsa_free(ctx);
return CCID_EXEC_ERROR;
}
return CCID_OK;
}
mbedtls_ecp_group_id get_ec_group_id_from_attr(const uint8_t *algo, size_t algo_len) { mbedtls_ecp_group_id get_ec_group_id_from_attr(const uint8_t *algo, size_t algo_len) {
if (memcmp(algorithm_attr_p256k1+2, algo, algo_len) == 0) if (memcmp(algorithm_attr_p256k1+2, algo, algo_len) == 0)
return MBEDTLS_ECP_DP_SECP256K1; return MBEDTLS_ECP_DP_SECP256K1;
@@ -1020,6 +1034,31 @@ static int cmd_pso_sig() {
} }
else if (algo[0] == ALGO_ECDH || algo[0] == ALGO_ECDSA) { else if (algo[0] == ALGO_ECDH || algo[0] == ALGO_ECDSA) {
mbedtls_ecdsa_context ctx;
mbedtls_ecdsa_init(&ctx);
mbedtls_md_type_t md = MBEDTLS_MD_SHA256;
if (apdu.cmd_apdu_data_len == 32)
md = MBEDTLS_MD_SHA256;
else if (apdu.cmd_apdu_data_len == 20)
md = MBEDTLS_MD_SHA1;
else if (apdu.cmd_apdu_data_len == 28)
md = MBEDTLS_MD_SHA224;
else if (apdu.cmd_apdu_data_len == 48)
md = MBEDTLS_MD_SHA384;
else if (apdu.cmd_apdu_data_len == 64)
md = MBEDTLS_MD_SHA512;
r = load_private_key_ecdsa(&ctx, ef);
if (r != CCID_OK)
return SW_CONDITIONS_NOT_SATISFIED();
size_t olen = 0;
uint8_t buf[MBEDTLS_ECDSA_MAX_LEN];
if (mbedtls_ecdsa_write_signature(&ctx, md, apdu.cmd_apdu_data, apdu.cmd_apdu_data_len, buf, MBEDTLS_ECDSA_MAX_LEN, &olen, random_gen, NULL) != 0) {
mbedtls_ecdsa_free(&ctx);
return SW_EXEC_ERROR();
}
memcpy(res_APDU, buf, olen);
res_APDU_size = olen;
mbedtls_ecdsa_free(&ctx);
} }
return SW_OK(); return SW_OK();
} }