632 lines
13 KiB
C
632 lines
13 KiB
C
/* $OpenBSD: sm2_crypt.c,v 1.2 2022/11/26 16:08:54 tb Exp $ */
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/*
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* Copyright (c) 2017, 2019 Ribose Inc
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*
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#ifndef OPENSSL_NO_SM2
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#include <string.h>
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#include <openssl/asn1.h>
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#include <openssl/asn1t.h>
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#include <openssl/bn.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/sm2.h>
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#include "sm2_local.h"
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typedef struct SM2_Ciphertext_st SM2_Ciphertext;
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SM2_Ciphertext *SM2_Ciphertext_new(void);
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void SM2_Ciphertext_free(SM2_Ciphertext *a);
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SM2_Ciphertext *d2i_SM2_Ciphertext(SM2_Ciphertext **a, const unsigned char **in,
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long len);
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int i2d_SM2_Ciphertext(SM2_Ciphertext *a, unsigned char **out);
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struct SM2_Ciphertext_st {
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BIGNUM *C1x;
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BIGNUM *C1y;
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ASN1_OCTET_STRING *C3;
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ASN1_OCTET_STRING *C2;
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};
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static const ASN1_TEMPLATE SM2_Ciphertext_seq_tt[] = {
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{
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.flags = 0,
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.tag = 0,
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.offset = offsetof(SM2_Ciphertext, C1x),
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.field_name = "C1x",
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.item = &BIGNUM_it,
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},
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{
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.flags = 0,
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.tag = 0,
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.offset = offsetof(SM2_Ciphertext, C1y),
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.field_name = "C1y",
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.item = &BIGNUM_it,
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},
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{
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.flags = 0,
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.tag = 0,
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.offset = offsetof(SM2_Ciphertext, C3),
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.field_name = "C3",
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.item = &ASN1_OCTET_STRING_it,
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},
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{
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.flags = 0,
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.tag = 0,
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.offset = offsetof(SM2_Ciphertext, C2),
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.field_name = "C2",
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.item = &ASN1_OCTET_STRING_it,
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},
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};
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const ASN1_ITEM SM2_Ciphertext_it = {
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.itype = ASN1_ITYPE_SEQUENCE,
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.utype = V_ASN1_SEQUENCE,
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.templates = SM2_Ciphertext_seq_tt,
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.tcount = sizeof(SM2_Ciphertext_seq_tt) / sizeof(ASN1_TEMPLATE),
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.funcs = NULL,
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.size = sizeof(SM2_Ciphertext),
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.sname = "SM2_Ciphertext",
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};
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SM2_Ciphertext *
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d2i_SM2_Ciphertext(SM2_Ciphertext **a, const unsigned char **in, long len)
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{
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return (SM2_Ciphertext *) ASN1_item_d2i((ASN1_VALUE **)a, in, len,
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&SM2_Ciphertext_it);
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}
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int
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i2d_SM2_Ciphertext(SM2_Ciphertext *a, unsigned char **out)
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{
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return ASN1_item_i2d((ASN1_VALUE *)a, out, &SM2_Ciphertext_it);
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}
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SM2_Ciphertext *
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SM2_Ciphertext_new(void)
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{
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return (SM2_Ciphertext *)ASN1_item_new(&SM2_Ciphertext_it);
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}
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void
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SM2_Ciphertext_free(SM2_Ciphertext *a)
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{
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ASN1_item_free((ASN1_VALUE *)a, &SM2_Ciphertext_it);
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}
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static size_t
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ec_field_size(const EC_GROUP *group)
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{
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/* Is there some simpler way to do this? */
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BIGNUM *p;
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size_t field_size = 0;
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if ((p = BN_new()) == NULL)
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goto err;
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if (!EC_GROUP_get_curve(group, p, NULL, NULL, NULL))
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goto err;
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field_size = BN_num_bytes(p);
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err:
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BN_free(p);
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return field_size;
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}
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int
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SM2_plaintext_size(const EC_KEY *key, const EVP_MD *digest, size_t msg_len,
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size_t *pl_size)
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{
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size_t field_size, overhead;
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int md_size;
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if ((field_size = ec_field_size(EC_KEY_get0_group(key))) == 0) {
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SM2error(SM2_R_INVALID_FIELD);
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return 0;
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}
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if ((md_size = EVP_MD_size(digest)) < 0) {
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SM2error(SM2_R_INVALID_DIGEST);
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return 0;
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}
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overhead = 10 + 2 * field_size + md_size;
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if (msg_len <= overhead) {
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SM2error(SM2_R_INVALID_ARGUMENT);
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return 0;
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}
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*pl_size = msg_len - overhead;
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return 1;
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}
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int
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SM2_ciphertext_size(const EC_KEY *key, const EVP_MD *digest, size_t msg_len,
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size_t *c_size)
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{
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size_t asn_size, field_size;
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int md_size;
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if ((field_size = ec_field_size(EC_KEY_get0_group(key))) == 0) {
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SM2error(SM2_R_INVALID_FIELD);
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return 0;
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}
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if ((md_size = EVP_MD_size(digest)) < 0) {
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SM2error(SM2_R_INVALID_DIGEST);
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return 0;
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}
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asn_size = 2 * ASN1_object_size(0, field_size + 1, V_ASN1_INTEGER) +
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ASN1_object_size(0, md_size, V_ASN1_OCTET_STRING) +
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ASN1_object_size(0, msg_len, V_ASN1_OCTET_STRING);
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*c_size = ASN1_object_size(1, asn_size, V_ASN1_SEQUENCE);
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return 1;
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}
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int
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sm2_kdf(uint8_t *key, size_t key_len, uint8_t *secret, size_t secret_len,
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const EVP_MD *digest)
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{
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EVP_MD_CTX *hash;
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uint8_t *hash_buf = NULL;
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uint32_t ctr = 1;
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uint8_t ctr_buf[4] = {0};
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size_t hadd, hlen;
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int rc = 0;
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if ((hash = EVP_MD_CTX_new()) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if ((hlen = EVP_MD_size(digest)) < 0) {
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SM2error(SM2_R_INVALID_DIGEST);
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goto err;
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}
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if ((hash_buf = malloc(hlen)) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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EVP_MD_CTX_init(hash);
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while ((key_len > 0) && (ctr != 0)) {
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if (!EVP_DigestInit_ex(hash, digest, NULL)) {
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SM2error(ERR_R_EVP_LIB);
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goto err;
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}
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if (!EVP_DigestUpdate(hash, secret, secret_len)) {
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SM2error(ERR_R_EVP_LIB);
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goto err;
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}
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/* big-endian counter representation */
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ctr_buf[0] = (ctr >> 24) & 0xff;
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ctr_buf[1] = (ctr >> 16) & 0xff;
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ctr_buf[2] = (ctr >> 8) & 0xff;
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ctr_buf[3] = ctr & 0xff;
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ctr++;
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if (!EVP_DigestUpdate(hash, ctr_buf, 4)) {
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SM2error(ERR_R_EVP_LIB);
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goto err;
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}
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if (!EVP_DigestFinal(hash, hash_buf, NULL)) {
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SM2error(ERR_R_EVP_LIB);
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goto err;
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}
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hadd = key_len > hlen ? hlen : key_len;
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memcpy(key, hash_buf, hadd);
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memset(hash_buf, 0, hlen);
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key_len -= hadd;
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key += hadd;
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}
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rc = 1;
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err:
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free(hash_buf);
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EVP_MD_CTX_free(hash);
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return rc;
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}
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int
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SM2_encrypt(const EC_KEY *key, const EVP_MD *digest, const uint8_t *msg,
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size_t msg_len, uint8_t *ciphertext_buf, size_t *ciphertext_len)
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{
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SM2_Ciphertext ctext_struct;
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EVP_MD_CTX *hash = NULL;
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BN_CTX *ctx = NULL;
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BIGNUM *order = NULL;
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BIGNUM *k, *x1, *y1, *x2, *y2;
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const EC_GROUP *group;
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const EC_POINT *P;
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EC_POINT *kG = NULL, *kP = NULL;
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uint8_t *msg_mask = NULL, *x2y2 = NULL, *C3 = NULL;
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size_t C3_size, field_size, i, x2size, y2size;
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int rc = 0;
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int clen;
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ctext_struct.C2 = NULL;
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ctext_struct.C3 = NULL;
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if ((hash = EVP_MD_CTX_new()) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if ((group = EC_KEY_get0_group(key)) == NULL) {
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SM2error(SM2_R_INVALID_KEY);
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goto err;
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}
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if ((order = BN_new()) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!EC_GROUP_get_order(group, order, NULL)) {
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SM2error(SM2_R_INVALID_GROUP_ORDER);
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goto err;
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}
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if ((P = EC_KEY_get0_public_key(key)) == NULL) {
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SM2error(SM2_R_INVALID_KEY);
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goto err;
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}
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if ((field_size = ec_field_size(group)) == 0) {
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SM2error(SM2_R_INVALID_FIELD);
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goto err;
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}
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if ((C3_size = EVP_MD_size(digest)) < 0) {
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SM2error(SM2_R_INVALID_DIGEST);
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goto err;
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}
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if ((kG = EC_POINT_new(group)) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if ((kP = EC_POINT_new(group)) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if ((ctx = BN_CTX_new()) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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BN_CTX_start(ctx);
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if ((k = BN_CTX_get(ctx)) == NULL) {
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SM2error(ERR_R_BN_LIB);
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goto err;
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}
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if ((x1 = BN_CTX_get(ctx)) == NULL) {
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SM2error(ERR_R_BN_LIB);
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goto err;
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}
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if ((x2 = BN_CTX_get(ctx)) == NULL) {
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SM2error(ERR_R_BN_LIB);
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goto err;
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}
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if ((y1 = BN_CTX_get(ctx)) == NULL) {
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SM2error(ERR_R_BN_LIB);
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goto err;
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}
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if ((y2 = BN_CTX_get(ctx)) == NULL) {
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SM2error(ERR_R_BN_LIB);
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goto err;
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}
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if ((x2y2 = calloc(2, field_size)) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if ((C3 = calloc(1, C3_size)) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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memset(ciphertext_buf, 0, *ciphertext_len);
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if (!BN_rand_range(k, order)) {
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SM2error(SM2_R_RANDOM_NUMBER_GENERATION_FAILED);
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goto err;
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}
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if (!EC_POINT_mul(group, kG, k, NULL, NULL, ctx)) {
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SM2error(ERR_R_EC_LIB);
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goto err;
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}
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if (!EC_POINT_get_affine_coordinates(group, kG, x1, y1, ctx)) {
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SM2error(ERR_R_EC_LIB);
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goto err;
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}
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if (!EC_POINT_mul(group, kP, NULL, P, k, ctx)) {
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SM2error(ERR_R_EC_LIB);
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goto err;
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}
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if (!EC_POINT_get_affine_coordinates(group, kP, x2, y2, ctx)) {
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SM2error(ERR_R_EC_LIB);
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goto err;
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}
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if ((x2size = BN_num_bytes(x2)) > field_size ||
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(y2size = BN_num_bytes(y2)) > field_size) {
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SM2error(SM2_R_BIGNUM_OUT_OF_RANGE);
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goto err;
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}
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BN_bn2bin(x2, x2y2 + field_size - x2size);
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BN_bn2bin(y2, x2y2 + 2 * field_size - y2size);
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if ((msg_mask = calloc(1, msg_len)) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!sm2_kdf(msg_mask, msg_len, x2y2, 2 * field_size, digest)) {
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SM2error(SM2_R_KDF_FAILURE);
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goto err;
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}
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for (i = 0; i != msg_len; i++)
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msg_mask[i] ^= msg[i];
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if (!EVP_DigestInit(hash, digest)) {
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SM2error(ERR_R_EVP_LIB);
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goto err;
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}
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if (!EVP_DigestUpdate(hash, x2y2, field_size)) {
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SM2error(ERR_R_EVP_LIB);
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goto err;
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}
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if (!EVP_DigestUpdate(hash, msg, msg_len)) {
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SM2error(ERR_R_EVP_LIB);
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goto err;
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}
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if (!EVP_DigestUpdate(hash, x2y2 + field_size, field_size)) {
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SM2error(ERR_R_EVP_LIB);
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goto err;
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}
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if (!EVP_DigestFinal(hash, C3, NULL)) {
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SM2error(ERR_R_EVP_LIB);
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goto err;
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}
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ctext_struct.C1x = x1;
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ctext_struct.C1y = y1;
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if ((ctext_struct.C3 = ASN1_OCTET_STRING_new()) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if ((ctext_struct.C2 = ASN1_OCTET_STRING_new()) == NULL) {
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SM2error(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (!ASN1_OCTET_STRING_set(ctext_struct.C3, C3, C3_size)) {
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SM2error(ERR_R_INTERNAL_ERROR);
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goto err;
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}
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if (!ASN1_OCTET_STRING_set(ctext_struct.C2, msg_mask, msg_len)) {
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SM2error(ERR_R_INTERNAL_ERROR);
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goto err;
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}
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if ((clen = i2d_SM2_Ciphertext(&ctext_struct, &ciphertext_buf)) < 0) {
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SM2error(ERR_R_INTERNAL_ERROR);
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goto err;
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}
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*ciphertext_len = clen;
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rc = 1;
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err:
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ASN1_OCTET_STRING_free(ctext_struct.C2);
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ASN1_OCTET_STRING_free(ctext_struct.C3);
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free(msg_mask);
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free(x2y2);
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free(C3);
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EVP_MD_CTX_free(hash);
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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EC_POINT_free(kG);
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EC_POINT_free(kP);
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BN_free(order);
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return rc;
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}
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int
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SM2_decrypt(const EC_KEY *key, const EVP_MD *digest, const uint8_t *ciphertext,
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size_t ciphertext_len, uint8_t *ptext_buf, size_t *ptext_len)
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{
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SM2_Ciphertext *sm2_ctext = NULL;
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EVP_MD_CTX *hash = NULL;
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BN_CTX *ctx = NULL;
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BIGNUM *x2, *y2;
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const EC_GROUP *group;
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EC_POINT *C1 = NULL;
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const uint8_t *C2, *C3;
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uint8_t *computed_C3 = NULL, *msg_mask = NULL, *x2y2 = NULL;
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size_t field_size, x2size, y2size;
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int msg_len = 0, rc = 0;
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int hash_size, i;
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if ((group = EC_KEY_get0_group(key)) == NULL) {
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SM2error(SM2_R_INVALID_KEY);
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goto err;
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}
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if ((field_size = ec_field_size(group)) == 0) {
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SM2error(SM2_R_INVALID_FIELD);
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goto err;
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}
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if ((hash_size = EVP_MD_size(digest)) < 0) {
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SM2error(SM2_R_INVALID_DIGEST);
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goto err;
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}
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memset(ptext_buf, 0xFF, *ptext_len);
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if ((sm2_ctext = d2i_SM2_Ciphertext(NULL, &ciphertext,
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ciphertext_len)) == NULL) {
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SM2error(SM2_R_ASN1_ERROR);
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goto err;
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}
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|
|
|
if (sm2_ctext->C3->length != hash_size) {
|
|
SM2error(SM2_R_INVALID_ENCODING);
|
|
goto err;
|
|
}
|
|
|
|
C2 = sm2_ctext->C2->data;
|
|
C3 = sm2_ctext->C3->data;
|
|
msg_len = sm2_ctext->C2->length;
|
|
|
|
if ((ctx = BN_CTX_new()) == NULL) {
|
|
SM2error(ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
BN_CTX_start(ctx);
|
|
if ((x2 = BN_CTX_get(ctx)) == NULL) {
|
|
SM2error(ERR_R_BN_LIB);
|
|
goto err;
|
|
}
|
|
if ((y2 = BN_CTX_get(ctx)) == NULL) {
|
|
SM2error(ERR_R_BN_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if ((msg_mask = calloc(1, msg_len)) == NULL) {
|
|
SM2error(ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
if ((x2y2 = calloc(2, field_size)) == NULL) {
|
|
SM2error(ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
if ((computed_C3 = calloc(1, hash_size)) == NULL) {
|
|
SM2error(ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
if ((C1 = EC_POINT_new(group)) == NULL) {
|
|
SM2error(ERR_R_MALLOC_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
if (!EC_POINT_set_affine_coordinates(group, C1, sm2_ctext->C1x,
|
|
sm2_ctext->C1y, ctx))
|
|
{
|
|
SM2error(ERR_R_EC_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if (!EC_POINT_mul(group, C1, NULL, C1, EC_KEY_get0_private_key(key),
|
|
ctx)) {
|
|
SM2error(ERR_R_EC_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if (!EC_POINT_get_affine_coordinates(group, C1, x2, y2, ctx)) {
|
|
SM2error(ERR_R_EC_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if ((x2size = BN_num_bytes(x2)) > field_size ||
|
|
(y2size = BN_num_bytes(y2)) > field_size) {
|
|
SM2error(SM2_R_BIGNUM_OUT_OF_RANGE);
|
|
goto err;
|
|
}
|
|
|
|
BN_bn2bin(x2, x2y2 + field_size - x2size);
|
|
BN_bn2bin(y2, x2y2 + 2 * field_size - y2size);
|
|
|
|
if (!sm2_kdf(msg_mask, msg_len, x2y2, 2 * field_size, digest)) {
|
|
SM2error(SM2_R_KDF_FAILURE);
|
|
goto err;
|
|
}
|
|
|
|
for (i = 0; i != msg_len; ++i)
|
|
ptext_buf[i] = C2[i] ^ msg_mask[i];
|
|
|
|
if ((hash = EVP_MD_CTX_new()) == NULL) {
|
|
SM2error(ERR_R_EVP_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if (!EVP_DigestInit(hash, digest)) {
|
|
SM2error(ERR_R_EVP_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if (!EVP_DigestUpdate(hash, x2y2, field_size)) {
|
|
SM2error(ERR_R_EVP_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if (!EVP_DigestUpdate(hash, ptext_buf, msg_len)) {
|
|
SM2error(ERR_R_EVP_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if (!EVP_DigestUpdate(hash, x2y2 + field_size, field_size)) {
|
|
SM2error(ERR_R_EVP_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if (!EVP_DigestFinal(hash, computed_C3, NULL)) {
|
|
SM2error(ERR_R_EVP_LIB);
|
|
goto err;
|
|
}
|
|
|
|
if (memcmp(computed_C3, C3, hash_size) != 0)
|
|
goto err;
|
|
|
|
rc = 1;
|
|
*ptext_len = msg_len;
|
|
|
|
err:
|
|
if (rc == 0)
|
|
memset(ptext_buf, 0, *ptext_len);
|
|
|
|
free(msg_mask);
|
|
free(x2y2);
|
|
free(computed_C3);
|
|
EC_POINT_free(C1);
|
|
BN_CTX_end(ctx);
|
|
BN_CTX_free(ctx);
|
|
SM2_Ciphertext_free(sm2_ctext);
|
|
EVP_MD_CTX_free(hash);
|
|
|
|
return rc;
|
|
}
|
|
|
|
#endif /* OPENSSL_NO_SM2 */
|