2 * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (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 "crypto/evp.h"
15 #include "crypto/sm2.h"
16 #include "crypto/sm2err.h"
18 /* EC pkey context structure */
23 /* Distinguishing Identifier, ISO/IEC 15946-3 */
26 /* id_set indicates if the 'id' field is set (1) or not (0) */
30 static int pkey_sm2_init(EVP_PKEY_CTX *ctx)
34 if ((smctx = OPENSSL_zalloc(sizeof(*smctx))) == NULL) {
35 SM2err(SM2_F_PKEY_SM2_INIT, ERR_R_MALLOC_FAILURE);
43 static void pkey_sm2_cleanup(EVP_PKEY_CTX *ctx)
45 SM2_PKEY_CTX *smctx = ctx->data;
48 OPENSSL_free(smctx->id);
54 static int pkey_sm2_copy(EVP_PKEY_CTX *dst, const EVP_PKEY_CTX *src)
56 SM2_PKEY_CTX *dctx, *sctx;
58 if (!pkey_sm2_init(dst))
62 if (sctx->id != NULL) {
63 dctx->id = OPENSSL_malloc(sctx->id_len);
64 if (dctx->id == NULL) {
65 SM2err(SM2_F_PKEY_SM2_COPY, ERR_R_MALLOC_FAILURE);
66 pkey_sm2_cleanup(dst);
69 memcpy(dctx->id, sctx->id, sctx->id_len);
71 dctx->id_len = sctx->id_len;
72 dctx->id_set = sctx->id_set;
78 static int pkey_sm2_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
79 const unsigned char *tbs, size_t tbslen)
83 EC_KEY *ec = ctx->pkey->pkey.ec;
84 const int sig_sz = ECDSA_size(ctx->pkey->pkey.ec);
91 *siglen = (size_t)sig_sz;
95 if (*siglen < (size_t)sig_sz) {
96 SM2err(SM2_F_PKEY_SM2_SIGN, SM2_R_BUFFER_TOO_SMALL);
100 ret = sm2_sign(tbs, tbslen, sig, &sltmp, ec);
104 *siglen = (size_t)sltmp;
108 static int pkey_sm2_verify(EVP_PKEY_CTX *ctx,
109 const unsigned char *sig, size_t siglen,
110 const unsigned char *tbs, size_t tbslen)
112 EC_KEY *ec = ctx->pkey->pkey.ec;
114 return sm2_verify(tbs, tbslen, sig, siglen, ec);
117 static int pkey_sm2_encrypt(EVP_PKEY_CTX *ctx,
118 unsigned char *out, size_t *outlen,
119 const unsigned char *in, size_t inlen)
121 EC_KEY *ec = ctx->pkey->pkey.ec;
122 SM2_PKEY_CTX *dctx = ctx->data;
123 const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md;
126 if (!sm2_ciphertext_size(ec, md, inlen, outlen))
132 return sm2_encrypt(ec, md, in, inlen, out, outlen);
135 static int pkey_sm2_decrypt(EVP_PKEY_CTX *ctx,
136 unsigned char *out, size_t *outlen,
137 const unsigned char *in, size_t inlen)
139 EC_KEY *ec = ctx->pkey->pkey.ec;
140 SM2_PKEY_CTX *dctx = ctx->data;
141 const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md;
144 if (!sm2_plaintext_size(ec, md, inlen, outlen))
150 return sm2_decrypt(ec, md, in, inlen, out, outlen);
153 static int pkey_sm2_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
155 SM2_PKEY_CTX *smctx = ctx->data;
159 case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
161 * This control could be removed, which would signal it being
162 * unsupported. However, that means that when the caller uses
163 * the correct curve, it may interpret the unsupported signal
164 * as an error, so it's better to accept the control, check the
165 * value and return a corresponding value.
168 SM2err(SM2_F_PKEY_SM2_CTRL, SM2_R_INVALID_CURVE);
173 case EVP_PKEY_CTRL_MD:
177 case EVP_PKEY_CTRL_GET_MD:
178 *(const EVP_MD **)p2 = smctx->md;
181 case EVP_PKEY_CTRL_SET1_ID:
183 tmp_id = OPENSSL_malloc(p1);
184 if (tmp_id == NULL) {
185 SM2err(SM2_F_PKEY_SM2_CTRL, ERR_R_MALLOC_FAILURE);
188 memcpy(tmp_id, p2, p1);
189 OPENSSL_free(smctx->id);
193 OPENSSL_free(smctx->id);
196 smctx->id_len = (size_t)p1;
200 case EVP_PKEY_CTRL_GET1_ID:
201 memcpy(p2, smctx->id, smctx->id_len);
204 case EVP_PKEY_CTRL_GET1_ID_LEN:
205 *(size_t *)p2 = smctx->id_len;
208 case EVP_PKEY_CTRL_DIGESTINIT:
209 /* nothing to be inited, this is to suppress the error... */
217 static int pkey_sm2_ctrl_str(EVP_PKEY_CTX *ctx,
218 const char *type, const char *value)
224 if (strcmp(type, "ec_paramgen_curve") == 0) {
227 if (((nid = EC_curve_nist2nid(value)) == NID_undef)
228 && ((nid = OBJ_sn2nid(value)) == NID_undef)
229 && ((nid = OBJ_ln2nid(value)) == NID_undef)) {
230 SM2err(SM2_F_PKEY_SM2_CTRL_STR, SM2_R_INVALID_CURVE);
233 return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
234 } else if (strcmp(type, "ec_param_enc") == 0) {
237 if (strcmp(value, "explicit") == 0)
239 else if (strcmp(value, "named_curve") == 0)
240 param_enc = OPENSSL_EC_NAMED_CURVE;
243 return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
244 } else if (strcmp(type, "sm2_id") == 0) {
245 return pkey_sm2_ctrl(ctx, EVP_PKEY_CTRL_SET1_ID,
246 (int)strlen(value), (void *)value);
247 } else if (strcmp(type, "sm2_hex_id") == 0) {
249 * TODO(3.0): reconsider the name "sm2_hex_id", OR change
250 * OSSL_PARAM_construct_from_text() / OSSL_PARAM_allocate_from_text()
251 * to handle infix "_hex_"
253 hex_id = OPENSSL_hexstr2buf((const char *)value, &hex_len);
254 if (hex_id == NULL) {
255 SM2err(SM2_F_PKEY_SM2_CTRL_STR, ERR_R_PASSED_INVALID_ARGUMENT);
258 ret = pkey_sm2_ctrl(ctx, EVP_PKEY_CTRL_SET1_ID, (int)hex_len,
260 OPENSSL_free(hex_id);
267 static int pkey_sm2_digest_custom(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
269 uint8_t z[EVP_MAX_MD_SIZE];
270 SM2_PKEY_CTX *smctx = ctx->data;
271 EC_KEY *ec = ctx->pkey->pkey.ec;
272 const EVP_MD *md = EVP_MD_CTX_md(mctx);
273 int mdlen = EVP_MD_size(md);
275 if (!smctx->id_set) {
277 * An ID value must be set. The specifications are not clear whether a
278 * NULL is allowed. We only allow it if set explicitly for maximum
281 SM2err(SM2_F_PKEY_SM2_DIGEST_CUSTOM, SM2_R_ID_NOT_SET);
286 SM2err(SM2_F_PKEY_SM2_DIGEST_CUSTOM, SM2_R_INVALID_DIGEST);
290 /* get hashed prefix 'z' of tbs message */
291 if (!sm2_compute_z_digest(z, md, smctx->id, smctx->id_len, ec))
294 return EVP_DigestUpdate(mctx, z, (size_t)mdlen);
297 static int pkey_sm2_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
302 ec = EC_KEY_new_by_curve_name(NID_sm2);
305 if (!ossl_assert(ret = EVP_PKEY_assign_EC_KEY(pkey, ec)))
310 static int pkey_sm2_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
314 ec = EC_KEY_new_by_curve_name(NID_sm2);
317 if (!ossl_assert(EVP_PKEY_assign_EC_KEY(pkey, ec))) {
321 /* Note: if error is returned, we count on caller to free pkey->pkey.ec */
322 if (ctx->pkey != NULL
323 && !EVP_PKEY_copy_parameters(pkey, ctx->pkey))
326 return EC_KEY_generate_key(ec);
329 static const EVP_PKEY_METHOD sm2_pkey_meth = {
367 pkey_sm2_digest_custom
370 const EVP_PKEY_METHOD *sm2_pkey_method(void)
372 return &sm2_pkey_meth;