2 * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include "internal/cryptlib.h"
11 #include <openssl/asn1t.h>
12 #include <openssl/ec.h>
13 #include <openssl/evp.h>
14 #include "internal/evp_int.h"
15 #include "internal/sm2.h"
16 #include "internal/sm2err.h"
18 /* EC pkey context structure */
21 /* Key and paramgen group */
25 /* Distinguishing Identifier, ISO/IEC 15946-3 */
28 /* id_set indicates if the 'id' field is set (1) or not (0) */
32 static int pkey_sm2_init(EVP_PKEY_CTX *ctx)
36 if ((smctx = OPENSSL_zalloc(sizeof(*smctx))) == NULL) {
37 SM2err(SM2_F_PKEY_SM2_INIT, ERR_R_MALLOC_FAILURE);
45 static void pkey_sm2_cleanup(EVP_PKEY_CTX *ctx)
47 SM2_PKEY_CTX *smctx = ctx->data;
50 EC_GROUP_free(smctx->gen_group);
51 OPENSSL_free(smctx->id);
57 static int pkey_sm2_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
59 SM2_PKEY_CTX *dctx, *sctx;
61 if (!pkey_sm2_init(dst))
65 if (sctx->gen_group != NULL) {
66 dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
67 if (dctx->gen_group == NULL) {
68 pkey_sm2_cleanup(dst);
72 if (sctx->id != NULL) {
73 dctx->id = OPENSSL_malloc(sctx->id_len);
74 if (dctx->id == NULL) {
75 pkey_sm2_cleanup(dst);
78 memcpy(dctx->id, sctx->id, sctx->id_len);
80 dctx->id_len = sctx->id_len;
81 dctx->id_set = sctx->id_set;
87 static int pkey_sm2_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
88 const unsigned char *tbs, size_t tbslen)
92 EC_KEY *ec = ctx->pkey->pkey.ec;
93 const int sig_sz = ECDSA_size(ctx->pkey->pkey.ec);
100 *siglen = (size_t)sig_sz;
104 if (*siglen < (size_t)sig_sz) {
105 SM2err(SM2_F_PKEY_SM2_SIGN, SM2_R_BUFFER_TOO_SMALL);
109 ret = sm2_sign(tbs, tbslen, sig, &sltmp, ec);
113 *siglen = (size_t)sltmp;
117 static int pkey_sm2_verify(EVP_PKEY_CTX *ctx,
118 const unsigned char *sig, size_t siglen,
119 const unsigned char *tbs, size_t tbslen)
121 EC_KEY *ec = ctx->pkey->pkey.ec;
123 return sm2_verify(tbs, tbslen, sig, siglen, ec);
126 static int pkey_sm2_encrypt(EVP_PKEY_CTX *ctx,
127 unsigned char *out, size_t *outlen,
128 const unsigned char *in, size_t inlen)
130 EC_KEY *ec = ctx->pkey->pkey.ec;
131 SM2_PKEY_CTX *dctx = ctx->data;
132 const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md;
135 if (!sm2_ciphertext_size(ec, md, inlen, outlen))
141 return sm2_encrypt(ec, md, in, inlen, out, outlen);
144 static int pkey_sm2_decrypt(EVP_PKEY_CTX *ctx,
145 unsigned char *out, size_t *outlen,
146 const unsigned char *in, size_t inlen)
148 EC_KEY *ec = ctx->pkey->pkey.ec;
149 SM2_PKEY_CTX *dctx = ctx->data;
150 const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md;
153 if (!sm2_plaintext_size(ec, md, inlen, outlen))
159 return sm2_decrypt(ec, md, in, inlen, out, outlen);
162 static int pkey_sm2_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
164 SM2_PKEY_CTX *smctx = ctx->data;
168 case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
169 group = EC_GROUP_new_by_curve_name(p1);
171 SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_INVALID_CURVE);
174 EC_GROUP_free(smctx->gen_group);
175 smctx->gen_group = group;
178 case EVP_PKEY_CTRL_EC_PARAM_ENC:
179 if (smctx->gen_group == NULL) {
180 SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_NO_PARAMETERS_SET);
183 EC_GROUP_set_asn1_flag(smctx->gen_group, p1);
186 case EVP_PKEY_CTRL_MD:
190 case EVP_PKEY_CTRL_GET_MD:
191 *(const EVP_MD **)p2 = smctx->md;
194 case EVP_PKEY_CTRL_SET1_ID:
195 OPENSSL_free(smctx->id);
197 smctx->id = OPENSSL_malloc(p1);
198 if (smctx->id == NULL)
200 memcpy(smctx->id, p2, p1);
205 smctx->id_len = (size_t)p1;
209 case EVP_PKEY_CTRL_GET1_ID:
210 memcpy(p2, smctx->id, smctx->id_len);
213 case EVP_PKEY_CTRL_GET1_ID_LEN:
214 *(size_t *)p2 = smctx->id_len;
222 static int pkey_sm2_ctrl_str(EVP_PKEY_CTX *ctx,
223 const char *type, const char *value)
225 if (strcmp(type, "ec_paramgen_curve") == 0) {
228 if (((nid = EC_curve_nist2nid(value)) == NID_undef)
229 && ((nid = OBJ_sn2nid(value)) == NID_undef)
230 && ((nid = OBJ_ln2nid(value)) == NID_undef)) {
231 SM2err(SM2_F_PKEY_SM2_CTRL_STR, SM2_R_INVALID_CURVE);
234 return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
235 } else if (strcmp(type, "ec_param_enc") == 0) {
238 if (strcmp(value, "explicit") == 0)
240 else if (strcmp(value, "named_curve") == 0)
241 param_enc = OPENSSL_EC_NAMED_CURVE;
244 return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
250 static int pkey_sm2_digest_custom(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
252 uint8_t z[EVP_MAX_MD_SIZE];
253 SM2_PKEY_CTX *smctx = ctx->data;
254 EC_KEY *ec = ctx->pkey->pkey.ec;
255 const EVP_MD *md = EVP_MD_CTX_md(mctx);
257 if (!smctx->id_set) {
259 * An ID value must be set. The specifications are not clear whether a
260 * NULL is allowed. We only allow it if set explicitly for maximum
266 /* get hashed prefix 'z' of tbs message */
267 if (!sm2_compute_z_digest(z, md, smctx->id, smctx->id_len, ec))
270 return EVP_DigestUpdate(mctx, z, EVP_MD_size(md));
273 const EVP_PKEY_METHOD sm2_pkey_meth = {
311 pkey_sm2_digest_custom