646 lines
18 KiB
C
646 lines
18 KiB
C
/*
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* Elliptic curve DSA
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*
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* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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/*
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* References:
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*
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* SEC1 http://www.secg.org/index.php?action=secg,docs_secg
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*/
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#define MBEDTLS_ECDSA_C
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#if defined(MBEDTLS_ECDSA_C)
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#include "ecdsa.h"
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#include "asn1write.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <string.h>
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#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
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#include "mbedtls/hmac_drbg.h"
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#endif
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#define DEBUG(format, ...) \
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printf("[%s]:%d: " format "\n", __func__, __LINE__, ##__VA_ARGS__)
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/*
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* Derive a suitable integer for group grp from a buffer of length len
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* SEC1 4.1.3 step 5 aka SEC1 4.1.4 step 3
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*/
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static int derive_mpi(const mbedtls_ecp_group *grp, mbedtls_mpi *x,
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const unsigned char *buf, size_t blen) {
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int ret;
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size_t n_size = (grp->nbits + 7) / 8;
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size_t use_size = blen > n_size ? n_size : blen;
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MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(x, buf, use_size));
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if (use_size * 8 > grp->nbits)
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MBEDTLS_MPI_CHK(mbedtls_mpi_shift_r(x, use_size * 8 - grp->nbits));
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/* While at it, reduce modulo N */
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if (mbedtls_mpi_cmp_mpi(x, &grp->N) >= 0)
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MBEDTLS_MPI_CHK(mbedtls_mpi_sub_mpi(x, x, &grp->N));
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cleanup:
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return (ret);
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}
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/*
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* Compute ECDSA signature of a hashed message (SEC1 4.1.3)
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* Obviously, compared to SEC1 4.1.3, we skip step 4 (hash message)
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*/
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int mbedtls_ecdsa_sign(mbedtls_ecp_group *grp, mbedtls_mpi *r, mbedtls_mpi *s,
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const mbedtls_mpi *d, const unsigned char *buf,
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size_t blen,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng) {
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int ret, key_tries, sign_tries, blind_tries;
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mbedtls_ecp_point R;
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mbedtls_mpi k, e, t;
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/* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
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if (grp->N.p == NULL)
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return (MBEDTLS_ERR_ECP_BAD_INPUT_DATA);
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mbedtls_ecp_point_init(&R);
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mbedtls_mpi_init(&k);
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mbedtls_mpi_init(&e);
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mbedtls_mpi_init(&t);
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sign_tries = 0;
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do {
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/*
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* Steps 1-3: generate a suitable ephemeral keypair
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* and set r = xR mod n
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*/
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key_tries = 0;
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do {
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MBEDTLS_MPI_CHK(mbedtls_ecp_gen_keypair(grp, &k, &R, f_rng, p_rng));
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MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(r, &R.X, &grp->N));
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if (key_tries++ > 10) {
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ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;
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goto cleanup;
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}
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} while (mbedtls_mpi_cmp_int(r, 0) == 0);
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/*
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* Step 5: derive MPI from hashed message
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*/
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MBEDTLS_MPI_CHK(derive_mpi(grp, &e, buf, blen));
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/*
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* Generate a random value to blind inv_mod in next step,
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* avoiding a potential timing leak.
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*/
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blind_tries = 0;
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do {
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size_t n_size = (grp->nbits + 7) / 8;
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MBEDTLS_MPI_CHK(mbedtls_mpi_fill_random(&t, n_size, f_rng, p_rng));
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MBEDTLS_MPI_CHK(mbedtls_mpi_shift_r(&t, 8 * n_size - grp->nbits));
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/* See mbedtls_ecp_gen_keypair() */
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if (++blind_tries > 30)
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return (MBEDTLS_ERR_ECP_RANDOM_FAILED);
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} while (mbedtls_mpi_cmp_int(&t, 1) < 0 ||
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mbedtls_mpi_cmp_mpi(&t, &grp->N) >= 0);
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/*
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* Step 6: compute s = (e + r * d) / k = t (e + rd) / (kt) mod n
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*/
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MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(s, r, d));
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MBEDTLS_MPI_CHK(mbedtls_mpi_add_mpi(&e, &e, s));
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MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&e, &e, &t));
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MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&k, &k, &t));
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MBEDTLS_MPI_CHK(mbedtls_mpi_inv_mod(s, &k, &grp->N));
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MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(s, s, &e));
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MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(s, s, &grp->N));
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if (sign_tries++ > 10) {
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ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;
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goto cleanup;
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}
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} while (mbedtls_mpi_cmp_int(s, 0) == 0);
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cleanup:
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mbedtls_ecp_point_free(&R);
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mbedtls_mpi_free(&k);
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mbedtls_mpi_free(&e);
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mbedtls_mpi_free(&t);
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return (ret);
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}
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#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
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/*
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* Deterministic signature wrapper
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*/
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int mbedtls_ecdsa_sign_det(mbedtls_ecp_group *grp, mbedtls_mpi *r,
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mbedtls_mpi *s, const mbedtls_mpi *d,
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const unsigned char *buf, size_t blen,
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mbedtls_md_type_t md_alg) {
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int ret;
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mbedtls_hmac_drbg_context rng_ctx;
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unsigned char data[2 * MBEDTLS_ECP_MAX_BYTES];
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size_t grp_len = (grp->nbits + 7) / 8;
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const mbedtls_md_info_t *md_info;
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mbedtls_mpi h;
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if ((md_info = mbedtls_md_info_from_type(md_alg)) == NULL)
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return (MBEDTLS_ERR_ECP_BAD_INPUT_DATA);
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mbedtls_mpi_init(&h);
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mbedtls_hmac_drbg_init(&rng_ctx);
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/* Use private key and message hash (reduced) to initialize HMAC_DRBG */
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MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(d, data, grp_len));
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MBEDTLS_MPI_CHK(derive_mpi(grp, &h, buf, blen));
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MBEDTLS_MPI_CHK(mbedtls_mpi_write_binary(&h, data + grp_len, grp_len));
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mbedtls_hmac_drbg_seed_buf(&rng_ctx, md_info, data, 2 * grp_len);
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ret = mbedtls_ecdsa_sign(grp, r, s, d, buf, blen, mbedtls_hmac_drbg_random,
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&rng_ctx);
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cleanup:
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mbedtls_hmac_drbg_free(&rng_ctx);
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mbedtls_mpi_free(&h);
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return (ret);
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}
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#endif /* MBEDTLS_ECDSA_DETERMINISTIC */
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/*
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* Verify ECDSA signature of hashed message (SEC1 4.1.4)
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* Obviously, compared to SEC1 4.1.3, we skip step 2 (hash message)
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*/
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int mbedtls_ecdsa_verify(mbedtls_ecp_group *grp, const unsigned char *buf,
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size_t blen, const mbedtls_ecp_point *Q,
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const mbedtls_mpi *r, const mbedtls_mpi *s) {
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int ret;
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mbedtls_mpi e, s_inv, u1, u2;
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mbedtls_ecp_point R;
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mbedtls_ecp_point_init(&R);
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mbedtls_mpi_init(&e);
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mbedtls_mpi_init(&s_inv);
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mbedtls_mpi_init(&u1);
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mbedtls_mpi_init(&u2);
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/* Fail cleanly on curves such as Curve25519 that can't be used for ECDSA */
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if (grp->N.p == NULL)
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return (MBEDTLS_ERR_ECP_BAD_INPUT_DATA);
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/*
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* Step 1: make sure r and s are in range 1..n-1
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*/
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if (mbedtls_mpi_cmp_int(r, 1) < 0 || mbedtls_mpi_cmp_mpi(r, &grp->N) >= 0 ||
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mbedtls_mpi_cmp_int(s, 1) < 0 || mbedtls_mpi_cmp_mpi(s, &grp->N) >= 0) {
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ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
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goto cleanup;
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}
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/*
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* Additional precaution: make sure Q is valid
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*/
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MBEDTLS_MPI_CHK(mbedtls_ecp_check_pubkey(grp, Q));
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/*
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* Step 3: derive MPI from hashed message
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*/
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MBEDTLS_MPI_CHK(derive_mpi(grp, &e, buf, blen));
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/*
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* Step 4: u1 = e / s mod n, u2 = r / s mod n
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*/
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MBEDTLS_MPI_CHK(mbedtls_mpi_inv_mod(&s_inv, s, &grp->N));
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MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&u1, &e, &s_inv));
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MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&u1, &u1, &grp->N));
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MBEDTLS_MPI_CHK(mbedtls_mpi_mul_mpi(&u2, r, &s_inv));
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MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&u2, &u2, &grp->N));
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/*
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* Step 5: R = u1 G + u2 Q
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*
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* Since we're not using any secret data, no need to pass a RNG to
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* mbedtls_ecp_mul() for countermesures.
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*/
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MBEDTLS_MPI_CHK(mbedtls_ecp_muladd(grp, &R, &u1, &grp->G, &u2, Q));
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if (mbedtls_ecp_is_zero(&R)) {
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ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
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goto cleanup;
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}
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/*
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* Step 6: convert xR to an integer (no-op)
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* Step 7: reduce xR mod n (gives v)
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*/
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MBEDTLS_MPI_CHK(mbedtls_mpi_mod_mpi(&R.X, &R.X, &grp->N));
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/*
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* Step 8: check if v (that is, R.X) is equal to r
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*/
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if (mbedtls_mpi_cmp_mpi(&R.X, r) != 0) {
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ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
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goto cleanup;
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}
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cleanup:
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mbedtls_ecp_point_free(&R);
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mbedtls_mpi_free(&e);
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mbedtls_mpi_free(&s_inv);
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mbedtls_mpi_free(&u1);
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mbedtls_mpi_free(&u2);
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return (ret);
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}
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/*
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* Convert a signature (given by context) to ASN.1
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*/
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static int ecdsa_signature_to_asn1(const mbedtls_mpi *r, const mbedtls_mpi *s,
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unsigned char *sig, size_t *slen) {
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int ret;
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unsigned char buf[MBEDTLS_ECDSA_MAX_LEN];
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unsigned char *p = buf + sizeof(buf);
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size_t len = 0;
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_mpi(&p, buf, s));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_mpi(&p, buf, r));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&p, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&p, buf,
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MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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memcpy(sig, p, len);
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*slen = len;
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return (0);
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}
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/*
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* Compute and write signature
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*/
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int mbedtls_ecdsa_write_signature(mbedtls_ecdsa_context *ctx,
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mbedtls_md_type_t md_alg,
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const unsigned char *hash, size_t hlen,
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unsigned char *sig, size_t *slen,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng) {
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int ret;
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mbedtls_mpi r, s;
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mbedtls_mpi_init(&r);
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mbedtls_mpi_init(&s);
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#if defined(MBEDTLS_ECDSA_DETERMINISTIC)
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(void)f_rng;
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(void)p_rng;
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MBEDTLS_MPI_CHK(
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mbedtls_ecdsa_sign_det(&ctx->grp, &r, &s, &ctx->d, hash, hlen, md_alg));
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#else
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(void)md_alg;
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MBEDTLS_MPI_CHK(
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mbedtls_ecdsa_sign(&ctx->grp, &r, &s, &ctx->d, hash, hlen, f_rng, p_rng));
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#endif
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MBEDTLS_MPI_CHK(ecdsa_signature_to_asn1(&r, &s, sig, slen));
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cleanup:
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mbedtls_mpi_free(&r);
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mbedtls_mpi_free(&s);
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return (ret);
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}
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#if !defined(MBEDTLS_DEPRECATED_REMOVED) && defined(MBEDTLS_ECDSA_DETERMINISTIC)
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int mbedtls_ecdsa_write_signature_det(mbedtls_ecdsa_context *ctx,
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const unsigned char *hash, size_t hlen,
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unsigned char *sig, size_t *slen,
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mbedtls_md_type_t md_alg) {
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return (mbedtls_ecdsa_write_signature(ctx, md_alg, hash, hlen, sig, slen,
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NULL, NULL));
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}
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#endif
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/*
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* Read and check signature
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*/
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int mbedtls_ecdsa_read_signature(mbedtls_ecdsa_context *ctx,
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const unsigned char *hash, size_t hlen,
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const unsigned char *sig, size_t slen) {
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int ret;
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unsigned char *p = (unsigned char *)sig;
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const unsigned char *end = sig + slen;
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size_t len;
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mbedtls_mpi r, s;
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mbedtls_mpi_init(&r);
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mbedtls_mpi_init(&s);
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if ((ret = mbedtls_asn1_get_tag(
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&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) !=
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0) {
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ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
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goto cleanup;
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}
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if (p + len != end) {
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ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA + MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
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goto cleanup;
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}
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if ((ret = mbedtls_asn1_get_mpi(&p, end, &r)) != 0 ||
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(ret = mbedtls_asn1_get_mpi(&p, end, &s)) != 0) {
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ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
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goto cleanup;
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}
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if ((ret = mbedtls_ecdsa_verify(&ctx->grp, hash, hlen, &ctx->Q, &r, &s)) != 0)
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goto cleanup;
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if (p != end)
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ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH;
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cleanup:
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mbedtls_mpi_free(&r);
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mbedtls_mpi_free(&s);
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return (ret);
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}
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/*
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* Generate key pair
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*/
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int mbedtls_ecdsa_genkey(mbedtls_ecdsa_context *ctx, mbedtls_ecp_group_id gid,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng) {
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return (mbedtls_ecp_group_load(&ctx->grp, gid) ||
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mbedtls_ecp_gen_keypair(&ctx->grp, &ctx->d, &ctx->Q, f_rng, p_rng));
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}
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/*
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* Set context from an mbedtls_ecp_keypair
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*/
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int mbedtls_ecdsa_from_keypair(mbedtls_ecdsa_context *ctx,
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const mbedtls_ecp_keypair *key) {
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int ret;
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if ((ret = mbedtls_ecp_group_copy(&ctx->grp, &key->grp)) != 0 ||
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(ret = mbedtls_mpi_copy(&ctx->d, &key->d)) != 0 ||
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(ret = mbedtls_ecp_copy(&ctx->Q, &key->Q)) != 0) {
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mbedtls_ecdsa_free(ctx);
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}
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return (ret);
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}
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/*
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* Initialize context
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*/
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void mbedtls_ecdsa_init(mbedtls_ecdsa_context *ctx) {
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mbedtls_ecp_keypair_init(ctx);
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}
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/*
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* Free context
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*/
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void mbedtls_ecdsa_free(mbedtls_ecdsa_context *ctx) {
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mbedtls_ecp_keypair_free(ctx);
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}
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static int rnd_std_rand(void *rng_state, unsigned char *output, size_t len) {
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size_t i;
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static int srand_flag = 1;
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if (srand_flag) {
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// srand(time(NULL));//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӡ<EFBFBD>
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srand(rand() + rand() + rand() + rand() * rand());
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srand_flag = 0;
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}
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for (i = 0; i < len; ++i)
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output[i] = rand();
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return (0);
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}
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#if 0
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||
int rk_ecdsa_sign(mbed_ecc_key_t *ec_key, unsigned char *hash, unsigned int hash_len,
|
||
unsigned char *sig, unsigned int *sig_len)
|
||
{
|
||
int ret;
|
||
mbedtls_ecp_group grp;
|
||
mbedtls_mpi r, s, d;
|
||
mbedtls_ecp_group_id gid;
|
||
|
||
mbedtls_mpi_init(&r);
|
||
mbedtls_mpi_init(&s);
|
||
mbedtls_mpi_init(&d);
|
||
mbedtls_ecp_group_init(&grp);
|
||
|
||
DEBUG("ec_key->curve = %d", ec_key->curve );
|
||
mbedtls_ecp_group_load(&grp, ec_key->curve);
|
||
|
||
MBEDTLS_MPI_CHK(mbedtls_ecdsa_sign(grp, &r, &s, d, hash, hash_len, rnd_std_rand, NULL));
|
||
MBEDTLS_MPI_CHK(ecdsa_signature_to_asn1(&r, &s, sig, sig_len ));
|
||
|
||
cleanup:
|
||
mbedtls_mpi_free(&r);
|
||
mbedtls_mpi_free(&s);
|
||
mbedtls_mpi_free(&d);
|
||
mbedtls_ecp_group_free(&grp);
|
||
return ret;
|
||
}
|
||
#endif
|
||
|
||
int rk_ecdsa_sign(const mbed_ecc_key_t *key, unsigned char *hash,
|
||
unsigned int hash_len, unsigned char *sig, size_t *sig_len) {
|
||
int ret = -1;
|
||
mbedtls_ecp_group grp;
|
||
mbedtls_mpi r, s;
|
||
mbedtls_mpi pri_key;
|
||
|
||
mbedtls_ecp_group_init(&grp);
|
||
mbedtls_mpi_init(&pri_key);
|
||
mbedtls_mpi_init(&r);
|
||
mbedtls_mpi_init(&s);
|
||
|
||
MBEDTLS_MPI_CHK(mbedtls_ecp_group_load(&grp, key->curve));
|
||
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&pri_key, key->d, key->d_len));
|
||
|
||
if (mbedtls_ecp_check_privkey(&grp, &pri_key) != 0) {
|
||
printf("mbedtls_ecp_check_privkey error\n");
|
||
return -1;
|
||
}
|
||
|
||
MBEDTLS_MPI_CHK(mbedtls_ecdsa_sign(&grp, &r, &s, &pri_key, hash, hash_len,
|
||
rnd_std_rand, NULL));
|
||
MBEDTLS_MPI_CHK(ecdsa_signature_to_asn1(&r, &s, sig, sig_len));
|
||
cleanup:
|
||
mbedtls_mpi_free(&r);
|
||
mbedtls_mpi_free(&s);
|
||
mbedtls_ecp_group_free(&grp);
|
||
mbedtls_mpi_free(&pri_key);
|
||
return ret;
|
||
}
|
||
|
||
int rk_ecdsa_verify(const mbed_ecc_key_t *key, unsigned char *hash,
|
||
unsigned int hash_len, unsigned char *sig,
|
||
unsigned int sig_len) {
|
||
int ret = -1;
|
||
mbedtls_ecp_group grp;
|
||
unsigned char *p = (unsigned char *)sig;
|
||
const unsigned char *end = sig + sig_len;
|
||
size_t len;
|
||
mbedtls_mpi r, s;
|
||
mbedtls_ecp_point pub_key;
|
||
|
||
mbedtls_ecp_group_init(&grp);
|
||
mbedtls_ecp_point_init(&pub_key);
|
||
mbedtls_mpi_init(&r);
|
||
mbedtls_mpi_init(&s);
|
||
|
||
MBEDTLS_MPI_CHK(mbedtls_ecp_group_load(&grp, key->curve));
|
||
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&pub_key.X, key->x, key->x_len));
|
||
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&pub_key.Y, key->y, key->y_len));
|
||
MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&pub_key.Z, 1));
|
||
|
||
if (mbedtls_ecp_check_pubkey(&grp, &pub_key) != 0) {
|
||
printf("mbedtls_ecp_check_privkey error\n");
|
||
return -1;
|
||
}
|
||
|
||
if ((ret = mbedtls_asn1_get_tag(
|
||
&p, end, &len, MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) !=
|
||
0) {
|
||
ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
|
||
goto cleanup;
|
||
}
|
||
|
||
if (p + len != end) {
|
||
ret = MBEDTLS_ERR_ECP_BAD_INPUT_DATA + MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
|
||
goto cleanup;
|
||
}
|
||
|
||
if ((ret = mbedtls_asn1_get_mpi(&p, end, &r)) != 0 ||
|
||
(ret = mbedtls_asn1_get_mpi(&p, end, &s)) != 0) {
|
||
ret += MBEDTLS_ERR_ECP_BAD_INPUT_DATA;
|
||
goto cleanup;
|
||
}
|
||
|
||
if ((ret = mbedtls_ecdsa_verify(&grp, hash, hash_len, &pub_key, &r, &s)) != 0)
|
||
goto cleanup;
|
||
|
||
if (p != end)
|
||
ret = MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH;
|
||
|
||
cleanup:
|
||
mbedtls_mpi_free(&r);
|
||
mbedtls_mpi_free(&s);
|
||
mbedtls_ecp_group_free(&grp);
|
||
mbedtls_ecp_point_free(&pub_key);
|
||
return ret;
|
||
}
|
||
|
||
int rk_ecdsa_sign2(const mbed_ecc_key_t *key, unsigned char *hash,
|
||
unsigned int hash_len, unsigned char *r_data,
|
||
unsigned int *r_len, unsigned char *s_data,
|
||
unsigned int *s_len) {
|
||
int ret = -1;
|
||
mbedtls_ecp_group grp;
|
||
mbedtls_mpi r, s;
|
||
mbedtls_mpi pri_key;
|
||
|
||
mbedtls_ecp_group_init(&grp);
|
||
mbedtls_mpi_init(&pri_key);
|
||
mbedtls_mpi_init(&r);
|
||
mbedtls_mpi_init(&s);
|
||
|
||
MBEDTLS_MPI_CHK(mbedtls_ecp_group_load(&grp, key->curve));
|
||
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&pri_key, key->d, key->d_len));
|
||
|
||
if (mbedtls_ecp_check_privkey(&grp, &pri_key) != 0) {
|
||
printf("mbedtls_ecp_check_privkey error\n");
|
||
return -1;
|
||
}
|
||
|
||
MBEDTLS_MPI_CHK(mbedtls_ecdsa_sign(&grp, &r, &s, &pri_key, hash, hash_len,
|
||
rnd_std_rand, NULL));
|
||
|
||
*r_len = mbedtls_mpi_size(&r);
|
||
mbedtls_mpi_write_binary(&r, r_data, *r_len);
|
||
|
||
*s_len = mbedtls_mpi_size(&s);
|
||
mbedtls_mpi_write_binary(&s, s_data, *s_len);
|
||
cleanup:
|
||
mbedtls_mpi_free(&r);
|
||
mbedtls_mpi_free(&s);
|
||
mbedtls_ecp_group_free(&grp);
|
||
mbedtls_mpi_free(&pri_key);
|
||
return ret;
|
||
}
|
||
|
||
int rk_ecdsa_verify2(const mbed_ecc_key_t *key, unsigned char *hash,
|
||
unsigned int hash_len, unsigned char *r_data,
|
||
unsigned int r_len, unsigned char *s_data,
|
||
unsigned int s_len) {
|
||
int ret = -1;
|
||
mbedtls_ecp_group grp;
|
||
mbedtls_mpi r, s;
|
||
mbedtls_ecp_point pub_key;
|
||
|
||
mbedtls_ecp_group_init(&grp);
|
||
mbedtls_ecp_point_init(&pub_key);
|
||
mbedtls_mpi_init(&r);
|
||
mbedtls_mpi_init(&s);
|
||
|
||
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&r, r_data, r_len));
|
||
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&s, s_data, s_len));
|
||
|
||
MBEDTLS_MPI_CHK(mbedtls_ecp_group_load(&grp, key->curve));
|
||
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&pub_key.X, key->x, key->x_len));
|
||
MBEDTLS_MPI_CHK(mbedtls_mpi_read_binary(&pub_key.Y, key->y, key->y_len));
|
||
MBEDTLS_MPI_CHK(mbedtls_mpi_lset(&pub_key.Z, 1));
|
||
|
||
if (mbedtls_ecp_check_pubkey(&grp, &pub_key) != 0) {
|
||
printf("mbedtls_ecp_check_privkey error\n");
|
||
return -1;
|
||
}
|
||
|
||
if ((ret = mbedtls_ecdsa_verify(&grp, hash, hash_len, &pub_key, &r, &s)) != 0)
|
||
goto cleanup;
|
||
|
||
cleanup:
|
||
mbedtls_mpi_free(&r);
|
||
mbedtls_mpi_free(&s);
|
||
mbedtls_ecp_group_free(&grp);
|
||
mbedtls_ecp_point_free(&pub_key);
|
||
return ret;
|
||
}
|
||
|
||
#endif /* MBEDTLS_ECDSA_C */
|