2 * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
3 * Copyright 2017 Ribose Inc. All Rights Reserved.
4 * Ported from Ribose contributions from Botan.
6 * Licensed under the OpenSSL license (the "License"). You may not use
7 * this file except in compliance with the License. You can obtain a copy
8 * in the file LICENSE in the source distribution or at
9 * https://www.openssl.org/source/license.html
12 #include "internal/sm2.h"
13 #include "internal/sm2err.h"
14 #include <openssl/err.h>
15 #include <openssl/evp.h>
16 #include <openssl/bn.h>
19 int sm2_compute_userid_digest(uint8_t *out,
25 const EC_GROUP *group = EC_KEY_get0_group(key);
27 EVP_MD_CTX *hash = NULL;
41 hash = EVP_MD_CTX_new();
43 if (hash == NULL || ctx == NULL) {
44 SM2err(SM2_F_SM2_COMPUTE_USERID_DIGEST, ERR_R_MALLOC_FAILURE);
57 SM2err(SM2_F_SM2_COMPUTE_USERID_DIGEST, ERR_R_MALLOC_FAILURE);
61 memset(out, 0, EVP_MD_size(digest));
63 if (!EVP_DigestInit(hash, digest)) {
64 SM2err(SM2_F_SM2_COMPUTE_USERID_DIGEST, ERR_R_EVP_LIB);
68 /* ZA = H256(ENTLA || IDA || a || b || xG || yG || xA || yA) */
70 uid_len = strlen(user_id);
71 if (uid_len >= (UINT16_MAX / 8)) {
73 SM2err(SM2_F_SM2_COMPUTE_USERID_DIGEST, SM2_R_USER_ID_TOO_LARGE);
77 entla = (uint16_t)(8 * uid_len);
80 if (!EVP_DigestUpdate(hash, &e_byte, 1)) {
81 SM2err(SM2_F_SM2_COMPUTE_USERID_DIGEST, ERR_R_EVP_LIB);
84 e_byte = entla & 0xFF;
85 if (!EVP_DigestUpdate(hash, &e_byte, 1)
86 || !EVP_DigestUpdate(hash, user_id, uid_len)) {
87 SM2err(SM2_F_SM2_COMPUTE_USERID_DIGEST, ERR_R_EVP_LIB);
91 if (!EC_GROUP_get_curve_GFp(group, p, a, b, ctx)) {
92 SM2err(SM2_F_SM2_COMPUTE_USERID_DIGEST, ERR_R_EC_LIB);
96 p_bytes = BN_num_bytes(p);
97 buf = OPENSSL_zalloc(p_bytes);
99 SM2err(SM2_F_SM2_COMPUTE_USERID_DIGEST, ERR_R_MALLOC_FAILURE);
103 if (BN_bn2binpad(a, buf, p_bytes) < 0
104 || !EVP_DigestUpdate(hash, buf, p_bytes)
105 || BN_bn2binpad(b, buf, p_bytes) < 0
106 || !EVP_DigestUpdate(hash, buf, p_bytes)
107 || !EC_POINT_get_affine_coordinates_GFp(group,
108 EC_GROUP_get0_generator(group),
110 || BN_bn2binpad(xG, buf, p_bytes) < 0
111 || !EVP_DigestUpdate(hash, buf, p_bytes)
112 || BN_bn2binpad(yG, buf, p_bytes) < 0
113 || !EVP_DigestUpdate(hash, buf, p_bytes)
114 || !EC_POINT_get_affine_coordinates_GFp(group,
115 EC_KEY_get0_public_key(key),
117 || BN_bn2binpad(xA, buf, p_bytes) < 0
118 || !EVP_DigestUpdate(hash, buf, p_bytes)
119 || BN_bn2binpad(yA, buf, p_bytes) < 0
120 || !EVP_DigestUpdate(hash, buf, p_bytes)
121 || !EVP_DigestFinal(hash, out, NULL)) {
122 SM2err(SM2_F_SM2_COMPUTE_USERID_DIGEST, ERR_R_INTERNAL_ERROR);
131 EVP_MD_CTX_free(hash);