480 lines
13 KiB
C
480 lines
13 KiB
C
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/*
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* Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
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* Copyright 2017 Ribose Inc. All Rights Reserved.
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* Ported from Ribose contributions from Botan.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include "crypto/sm2.h"
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#include "crypto/sm2err.h"
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#include "crypto/ec.h" /* ec_group_do_inverse_ord() */
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#include "internal/numbers.h"
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/err.h>
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#include <openssl/bn.h>
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#include <string.h>
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int sm2_compute_z_digest(uint8_t *out,
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const EVP_MD *digest,
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const uint8_t *id,
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const size_t id_len,
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const EC_KEY *key)
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{
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int rc = 0;
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const EC_GROUP *group = EC_KEY_get0_group(key);
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BN_CTX *ctx = NULL;
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EVP_MD_CTX *hash = NULL;
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BIGNUM *p = NULL;
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BIGNUM *a = NULL;
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BIGNUM *b = NULL;
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BIGNUM *xG = NULL;
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BIGNUM *yG = NULL;
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BIGNUM *xA = NULL;
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BIGNUM *yA = NULL;
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int p_bytes = 0;
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uint8_t *buf = NULL;
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uint16_t entl = 0;
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uint8_t e_byte = 0;
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hash = EVP_MD_CTX_new();
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ctx = BN_CTX_new();
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if (hash == NULL || ctx == NULL) {
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SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_MALLOC_FAILURE);
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goto done;
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}
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p = BN_CTX_get(ctx);
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a = BN_CTX_get(ctx);
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b = BN_CTX_get(ctx);
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xG = BN_CTX_get(ctx);
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yG = BN_CTX_get(ctx);
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xA = BN_CTX_get(ctx);
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yA = BN_CTX_get(ctx);
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if (yA == NULL) {
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SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_MALLOC_FAILURE);
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goto done;
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}
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if (!EVP_DigestInit(hash, digest)) {
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SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_EVP_LIB);
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goto done;
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}
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/* Z = h(ENTL || ID || a || b || xG || yG || xA || yA) */
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if (id_len >= (UINT16_MAX / 8)) {
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/* too large */
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SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, SM2_R_ID_TOO_LARGE);
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goto done;
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}
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entl = (uint16_t)(8 * id_len);
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e_byte = entl >> 8;
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if (!EVP_DigestUpdate(hash, &e_byte, 1)) {
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SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_EVP_LIB);
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goto done;
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}
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e_byte = entl & 0xFF;
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if (!EVP_DigestUpdate(hash, &e_byte, 1)) {
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SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_EVP_LIB);
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goto done;
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}
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if (id_len > 0 && !EVP_DigestUpdate(hash, id, id_len)) {
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SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_EVP_LIB);
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goto done;
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}
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if (!EC_GROUP_get_curve(group, p, a, b, ctx)) {
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SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_EC_LIB);
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goto done;
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}
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p_bytes = BN_num_bytes(p);
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buf = OPENSSL_zalloc(p_bytes);
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if (buf == NULL) {
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SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_MALLOC_FAILURE);
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goto done;
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}
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if (BN_bn2binpad(a, buf, p_bytes) < 0
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|| !EVP_DigestUpdate(hash, buf, p_bytes)
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|| BN_bn2binpad(b, buf, p_bytes) < 0
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|| !EVP_DigestUpdate(hash, buf, p_bytes)
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|| !EC_POINT_get_affine_coordinates(group,
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EC_GROUP_get0_generator(group),
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xG, yG, ctx)
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|| BN_bn2binpad(xG, buf, p_bytes) < 0
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|| !EVP_DigestUpdate(hash, buf, p_bytes)
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|| BN_bn2binpad(yG, buf, p_bytes) < 0
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|| !EVP_DigestUpdate(hash, buf, p_bytes)
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|| !EC_POINT_get_affine_coordinates(group,
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EC_KEY_get0_public_key(key),
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xA, yA, ctx)
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|| BN_bn2binpad(xA, buf, p_bytes) < 0
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|| !EVP_DigestUpdate(hash, buf, p_bytes)
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|| BN_bn2binpad(yA, buf, p_bytes) < 0
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|| !EVP_DigestUpdate(hash, buf, p_bytes)
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|| !EVP_DigestFinal(hash, out, NULL)) {
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SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_INTERNAL_ERROR);
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goto done;
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}
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rc = 1;
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done:
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OPENSSL_free(buf);
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BN_CTX_free(ctx);
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EVP_MD_CTX_free(hash);
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return rc;
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}
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static BIGNUM *sm2_compute_msg_hash(const EVP_MD *digest,
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const EC_KEY *key,
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const uint8_t *id,
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const size_t id_len,
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const uint8_t *msg, size_t msg_len)
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{
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EVP_MD_CTX *hash = EVP_MD_CTX_new();
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const int md_size = EVP_MD_size(digest);
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uint8_t *z = NULL;
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BIGNUM *e = NULL;
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if (md_size < 0) {
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SM2err(SM2_F_SM2_COMPUTE_MSG_HASH, SM2_R_INVALID_DIGEST);
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goto done;
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}
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z = OPENSSL_zalloc(md_size);
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if (hash == NULL || z == NULL) {
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SM2err(SM2_F_SM2_COMPUTE_MSG_HASH, ERR_R_MALLOC_FAILURE);
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goto done;
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}
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if (!sm2_compute_z_digest(z, digest, id, id_len, key)) {
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/* SM2err already called */
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goto done;
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}
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if (!EVP_DigestInit(hash, digest)
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|| !EVP_DigestUpdate(hash, z, md_size)
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|| !EVP_DigestUpdate(hash, msg, msg_len)
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/* reuse z buffer to hold H(Z || M) */
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|| !EVP_DigestFinal(hash, z, NULL)) {
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SM2err(SM2_F_SM2_COMPUTE_MSG_HASH, ERR_R_EVP_LIB);
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goto done;
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}
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e = BN_bin2bn(z, md_size, NULL);
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if (e == NULL)
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SM2err(SM2_F_SM2_COMPUTE_MSG_HASH, ERR_R_INTERNAL_ERROR);
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done:
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OPENSSL_free(z);
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EVP_MD_CTX_free(hash);
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return e;
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}
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static ECDSA_SIG *sm2_sig_gen(const EC_KEY *key, const BIGNUM *e)
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{
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const BIGNUM *dA = EC_KEY_get0_private_key(key);
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const EC_GROUP *group = EC_KEY_get0_group(key);
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const BIGNUM *order = EC_GROUP_get0_order(group);
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ECDSA_SIG *sig = NULL;
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EC_POINT *kG = NULL;
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BN_CTX *ctx = NULL;
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BIGNUM *k = NULL;
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BIGNUM *rk = NULL;
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BIGNUM *r = NULL;
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BIGNUM *s = NULL;
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BIGNUM *x1 = NULL;
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BIGNUM *tmp = NULL;
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kG = EC_POINT_new(group);
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ctx = BN_CTX_new();
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if (kG == NULL || ctx == NULL) {
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SM2err(SM2_F_SM2_SIG_GEN, ERR_R_MALLOC_FAILURE);
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goto done;
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}
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BN_CTX_start(ctx);
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k = BN_CTX_get(ctx);
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rk = BN_CTX_get(ctx);
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x1 = BN_CTX_get(ctx);
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tmp = BN_CTX_get(ctx);
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if (tmp == NULL) {
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SM2err(SM2_F_SM2_SIG_GEN, ERR_R_MALLOC_FAILURE);
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goto done;
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}
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/*
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* These values are returned and so should not be allocated out of the
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* context
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*/
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r = BN_new();
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s = BN_new();
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if (r == NULL || s == NULL) {
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SM2err(SM2_F_SM2_SIG_GEN, ERR_R_MALLOC_FAILURE);
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goto done;
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}
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for (;;) {
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if (!BN_priv_rand_range(k, order)) {
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SM2err(SM2_F_SM2_SIG_GEN, ERR_R_INTERNAL_ERROR);
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goto done;
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}
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if (!EC_POINT_mul(group, kG, k, NULL, NULL, ctx)
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|| !EC_POINT_get_affine_coordinates(group, kG, x1, NULL,
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ctx)
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|| !BN_mod_add(r, e, x1, order, ctx)) {
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SM2err(SM2_F_SM2_SIG_GEN, ERR_R_INTERNAL_ERROR);
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goto done;
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}
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/* try again if r == 0 or r+k == n */
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if (BN_is_zero(r))
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continue;
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if (!BN_add(rk, r, k)) {
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SM2err(SM2_F_SM2_SIG_GEN, ERR_R_INTERNAL_ERROR);
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goto done;
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}
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if (BN_cmp(rk, order) == 0)
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continue;
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if (!BN_add(s, dA, BN_value_one())
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|| !ec_group_do_inverse_ord(group, s, s, ctx)
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|| !BN_mod_mul(tmp, dA, r, order, ctx)
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|| !BN_sub(tmp, k, tmp)
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|| !BN_mod_mul(s, s, tmp, order, ctx)) {
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SM2err(SM2_F_SM2_SIG_GEN, ERR_R_BN_LIB);
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goto done;
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}
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sig = ECDSA_SIG_new();
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if (sig == NULL) {
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SM2err(SM2_F_SM2_SIG_GEN, ERR_R_MALLOC_FAILURE);
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goto done;
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}
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/* takes ownership of r and s */
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ECDSA_SIG_set0(sig, r, s);
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break;
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}
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done:
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if (sig == NULL) {
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BN_free(r);
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BN_free(s);
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}
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BN_CTX_free(ctx);
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EC_POINT_free(kG);
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return sig;
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}
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static int sm2_sig_verify(const EC_KEY *key, const ECDSA_SIG *sig,
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const BIGNUM *e)
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{
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int ret = 0;
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const EC_GROUP *group = EC_KEY_get0_group(key);
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const BIGNUM *order = EC_GROUP_get0_order(group);
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BN_CTX *ctx = NULL;
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EC_POINT *pt = NULL;
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BIGNUM *t = NULL;
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BIGNUM *x1 = NULL;
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const BIGNUM *r = NULL;
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const BIGNUM *s = NULL;
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ctx = BN_CTX_new();
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pt = EC_POINT_new(group);
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if (ctx == NULL || pt == NULL) {
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SM2err(SM2_F_SM2_SIG_VERIFY, ERR_R_MALLOC_FAILURE);
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goto done;
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}
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BN_CTX_start(ctx);
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t = BN_CTX_get(ctx);
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x1 = BN_CTX_get(ctx);
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if (x1 == NULL) {
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SM2err(SM2_F_SM2_SIG_VERIFY, ERR_R_MALLOC_FAILURE);
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goto done;
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}
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/*
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* B1: verify whether r' in [1,n-1], verification failed if not
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* B2: verify whether s' in [1,n-1], verification failed if not
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* B3: set M'~=ZA || M'
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* B4: calculate e'=Hv(M'~)
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* B5: calculate t = (r' + s') modn, verification failed if t=0
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* B6: calculate the point (x1', y1')=[s']G + [t]PA
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* B7: calculate R=(e'+x1') modn, verification pass if yes, otherwise failed
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*/
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ECDSA_SIG_get0(sig, &r, &s);
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if (BN_cmp(r, BN_value_one()) < 0
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|| BN_cmp(s, BN_value_one()) < 0
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|| BN_cmp(order, r) <= 0
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|| BN_cmp(order, s) <= 0) {
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SM2err(SM2_F_SM2_SIG_VERIFY, SM2_R_BAD_SIGNATURE);
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goto done;
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}
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if (!BN_mod_add(t, r, s, order, ctx)) {
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SM2err(SM2_F_SM2_SIG_VERIFY, ERR_R_BN_LIB);
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goto done;
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}
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if (BN_is_zero(t)) {
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SM2err(SM2_F_SM2_SIG_VERIFY, SM2_R_BAD_SIGNATURE);
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goto done;
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}
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if (!EC_POINT_mul(group, pt, s, EC_KEY_get0_public_key(key), t, ctx)
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|| !EC_POINT_get_affine_coordinates(group, pt, x1, NULL, ctx)) {
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SM2err(SM2_F_SM2_SIG_VERIFY, ERR_R_EC_LIB);
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goto done;
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}
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if (!BN_mod_add(t, e, x1, order, ctx)) {
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|
|
SM2err(SM2_F_SM2_SIG_VERIFY, ERR_R_BN_LIB);
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (BN_cmp(r, t) == 0)
|
||
|
|
ret = 1;
|
||
|
|
|
||
|
|
done:
|
||
|
|
EC_POINT_free(pt);
|
||
|
|
BN_CTX_free(ctx);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
ECDSA_SIG *sm2_do_sign(const EC_KEY *key,
|
||
|
|
const EVP_MD *digest,
|
||
|
|
const uint8_t *id,
|
||
|
|
const size_t id_len,
|
||
|
|
const uint8_t *msg, size_t msg_len)
|
||
|
|
{
|
||
|
|
BIGNUM *e = NULL;
|
||
|
|
ECDSA_SIG *sig = NULL;
|
||
|
|
|
||
|
|
e = sm2_compute_msg_hash(digest, key, id, id_len, msg, msg_len);
|
||
|
|
if (e == NULL) {
|
||
|
|
/* SM2err already called */
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
sig = sm2_sig_gen(key, e);
|
||
|
|
|
||
|
|
done:
|
||
|
|
BN_free(e);
|
||
|
|
return sig;
|
||
|
|
}
|
||
|
|
|
||
|
|
int sm2_do_verify(const EC_KEY *key,
|
||
|
|
const EVP_MD *digest,
|
||
|
|
const ECDSA_SIG *sig,
|
||
|
|
const uint8_t *id,
|
||
|
|
const size_t id_len,
|
||
|
|
const uint8_t *msg, size_t msg_len)
|
||
|
|
{
|
||
|
|
BIGNUM *e = NULL;
|
||
|
|
int ret = 0;
|
||
|
|
|
||
|
|
e = sm2_compute_msg_hash(digest, key, id, id_len, msg, msg_len);
|
||
|
|
if (e == NULL) {
|
||
|
|
/* SM2err already called */
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = sm2_sig_verify(key, sig, e);
|
||
|
|
|
||
|
|
done:
|
||
|
|
BN_free(e);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int sm2_sign(const unsigned char *dgst, int dgstlen,
|
||
|
|
unsigned char *sig, unsigned int *siglen, EC_KEY *eckey)
|
||
|
|
{
|
||
|
|
BIGNUM *e = NULL;
|
||
|
|
ECDSA_SIG *s = NULL;
|
||
|
|
int sigleni;
|
||
|
|
int ret = -1;
|
||
|
|
|
||
|
|
e = BN_bin2bn(dgst, dgstlen, NULL);
|
||
|
|
if (e == NULL) {
|
||
|
|
SM2err(SM2_F_SM2_SIGN, ERR_R_BN_LIB);
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
s = sm2_sig_gen(eckey, e);
|
||
|
|
|
||
|
|
sigleni = i2d_ECDSA_SIG(s, &sig);
|
||
|
|
if (sigleni < 0) {
|
||
|
|
SM2err(SM2_F_SM2_SIGN, ERR_R_INTERNAL_ERROR);
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
*siglen = (unsigned int)sigleni;
|
||
|
|
|
||
|
|
ret = 1;
|
||
|
|
|
||
|
|
done:
|
||
|
|
ECDSA_SIG_free(s);
|
||
|
|
BN_free(e);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int sm2_verify(const unsigned char *dgst, int dgstlen,
|
||
|
|
const unsigned char *sig, int sig_len, EC_KEY *eckey)
|
||
|
|
{
|
||
|
|
ECDSA_SIG *s = NULL;
|
||
|
|
BIGNUM *e = NULL;
|
||
|
|
const unsigned char *p = sig;
|
||
|
|
unsigned char *der = NULL;
|
||
|
|
int derlen = -1;
|
||
|
|
int ret = -1;
|
||
|
|
|
||
|
|
s = ECDSA_SIG_new();
|
||
|
|
if (s == NULL) {
|
||
|
|
SM2err(SM2_F_SM2_VERIFY, ERR_R_MALLOC_FAILURE);
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL) {
|
||
|
|
SM2err(SM2_F_SM2_VERIFY, SM2_R_INVALID_ENCODING);
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
/* Ensure signature uses DER and doesn't have trailing garbage */
|
||
|
|
derlen = i2d_ECDSA_SIG(s, &der);
|
||
|
|
if (derlen != sig_len || memcmp(sig, der, derlen) != 0) {
|
||
|
|
SM2err(SM2_F_SM2_VERIFY, SM2_R_INVALID_ENCODING);
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
e = BN_bin2bn(dgst, dgstlen, NULL);
|
||
|
|
if (e == NULL) {
|
||
|
|
SM2err(SM2_F_SM2_VERIFY, ERR_R_BN_LIB);
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
|
||
|
|
ret = sm2_sig_verify(eckey, s, e);
|
||
|
|
|
||
|
|
done:
|
||
|
|
OPENSSL_free(der);
|
||
|
|
BN_free(e);
|
||
|
|
ECDSA_SIG_free(s);
|
||
|
|
return ret;
|
||
|
|
}
|