2 * Copyright 2006-2016 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
11 #include "internal/cryptlib.h"
12 #include <openssl/asn1t.h>
13 #include <openssl/x509.h>
14 #include <openssl/ec.h>
16 #include <openssl/evp.h>
17 #include "internal/evp_int.h"
19 #if !defined(OPENSSL_NO_SM2)
20 #include <openssl/sm2.h>
23 /* EC pkey context structure */
26 /* Key and paramgen group */
30 /* Duplicate key if custom cofactor needed */
33 signed char cofactor_mode;
34 /* KDF (if any) to use for ECDH */
36 /* Message digest to use for key derivation */
38 /* User key material */
39 unsigned char *kdf_ukm;
41 /* KDF output length */
45 static int pkey_ec_init(EVP_PKEY_CTX *ctx)
49 dctx = OPENSSL_zalloc(sizeof(*dctx));
53 dctx->cofactor_mode = -1;
54 dctx->kdf_type = EVP_PKEY_ECDH_KDF_NONE;
59 static int pkey_ec_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
61 EC_PKEY_CTX *dctx, *sctx;
62 if (!pkey_ec_init(dst))
66 if (sctx->gen_group) {
67 dctx->gen_group = EC_GROUP_dup(sctx->gen_group);
74 dctx->co_key = EC_KEY_dup(sctx->co_key);
78 dctx->kdf_type = sctx->kdf_type;
79 dctx->kdf_md = sctx->kdf_md;
80 dctx->kdf_outlen = sctx->kdf_outlen;
82 dctx->kdf_ukm = OPENSSL_memdup(sctx->kdf_ukm, sctx->kdf_ukmlen);
87 dctx->kdf_ukmlen = sctx->kdf_ukmlen;
91 static void pkey_ec_cleanup(EVP_PKEY_CTX *ctx)
93 EC_PKEY_CTX *dctx = ctx->data;
95 EC_GROUP_free(dctx->gen_group);
96 EC_KEY_free(dctx->co_key);
97 OPENSSL_free(dctx->kdf_ukm);
102 static int pkey_ec_sign(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
103 const unsigned char *tbs, size_t tbslen)
107 EC_PKEY_CTX *dctx = ctx->data;
108 EC_KEY *ec = ctx->pkey->pkey.ec;
109 const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
112 *siglen = ECDSA_size(ec);
114 } else if (*siglen < (size_t)ECDSA_size(ec)) {
115 ECerr(EC_F_PKEY_EC_SIGN, EC_R_BUFFER_TOO_SMALL);
120 type = EVP_MD_type(dctx->md);
124 if (ec_nid == NID_sm2) {
125 #if defined(OPENSSL_NO_SM2)
128 ret = SM2_sign(type, tbs, tbslen, sig, &sltmp, ec);
132 ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
137 *siglen = (size_t)sltmp;
141 static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
142 const unsigned char *sig, size_t siglen,
143 const unsigned char *tbs, size_t tbslen)
146 EC_PKEY_CTX *dctx = ctx->data;
147 EC_KEY *ec = ctx->pkey->pkey.ec;
148 const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
151 type = EVP_MD_type(dctx->md);
155 if (ec_nid == NID_sm2) {
156 #if defined(OPENSSL_NO_SM2)
159 ret = SM2_verify(type, tbs, tbslen, sig, siglen, ec);
163 ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
170 #ifndef OPENSSL_NO_EC
171 static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
176 const EC_POINT *pubkey = NULL;
178 EC_PKEY_CTX *dctx = ctx->data;
179 if (!ctx->pkey || !ctx->peerkey) {
180 ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
184 eckey = dctx->co_key ? dctx->co_key : ctx->pkey->pkey.ec;
187 const EC_GROUP *group;
188 group = EC_KEY_get0_group(eckey);
189 *keylen = (EC_GROUP_get_degree(group) + 7) / 8;
192 pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
195 * NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is not
196 * an error, the result is truncated.
201 ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
208 static int pkey_ec_kdf_derive(EVP_PKEY_CTX *ctx,
209 unsigned char *key, size_t *keylen)
211 EC_PKEY_CTX *dctx = ctx->data;
212 unsigned char *ktmp = NULL;
215 if (dctx->kdf_type == EVP_PKEY_ECDH_KDF_NONE)
216 return pkey_ec_derive(ctx, key, keylen);
218 *keylen = dctx->kdf_outlen;
221 if (*keylen != dctx->kdf_outlen)
223 if (!pkey_ec_derive(ctx, NULL, &ktmplen))
225 ktmp = OPENSSL_malloc(ktmplen);
228 if (!pkey_ec_derive(ctx, ktmp, &ktmplen))
231 if (!ECDH_KDF_X9_62(key, *keylen, ktmp, ktmplen,
232 dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md))
237 OPENSSL_clear_free(ktmp, ktmplen);
242 static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
244 EC_PKEY_CTX *dctx = ctx->data;
247 case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
248 group = EC_GROUP_new_by_curve_name(p1);
250 ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
253 EC_GROUP_free(dctx->gen_group);
254 dctx->gen_group = group;
257 case EVP_PKEY_CTRL_EC_PARAM_ENC:
258 if (!dctx->gen_group) {
259 ECerr(EC_F_PKEY_EC_CTRL, EC_R_NO_PARAMETERS_SET);
262 EC_GROUP_set_asn1_flag(dctx->gen_group, p1);
265 #ifndef OPENSSL_NO_EC
266 case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
268 if (dctx->cofactor_mode != -1)
269 return dctx->cofactor_mode;
271 EC_KEY *ec_key = ctx->pkey->pkey.ec;
272 return EC_KEY_get_flags(ec_key) & EC_FLAG_COFACTOR_ECDH ? 1 :
275 } else if (p1 < -1 || p1 > 1)
277 dctx->cofactor_mode = p1;
279 EC_KEY *ec_key = ctx->pkey->pkey.ec;
282 /* If cofactor is 1 cofactor mode does nothing */
283 if (BN_is_one(ec_key->group->cofactor))
286 dctx->co_key = EC_KEY_dup(ec_key);
291 EC_KEY_set_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
293 EC_KEY_clear_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
295 EC_KEY_free(dctx->co_key);
301 case EVP_PKEY_CTRL_EC_KDF_TYPE:
303 return dctx->kdf_type;
304 if (p1 != EVP_PKEY_ECDH_KDF_NONE && p1 != EVP_PKEY_ECDH_KDF_X9_62)
309 case EVP_PKEY_CTRL_EC_KDF_MD:
313 case EVP_PKEY_CTRL_GET_EC_KDF_MD:
314 *(const EVP_MD **)p2 = dctx->kdf_md;
317 case EVP_PKEY_CTRL_EC_KDF_OUTLEN:
320 dctx->kdf_outlen = (size_t)p1;
323 case EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN:
324 *(int *)p2 = dctx->kdf_outlen;
327 case EVP_PKEY_CTRL_EC_KDF_UKM:
328 OPENSSL_free(dctx->kdf_ukm);
331 dctx->kdf_ukmlen = p1;
333 dctx->kdf_ukmlen = 0;
336 case EVP_PKEY_CTRL_GET_EC_KDF_UKM:
337 *(unsigned char **)p2 = dctx->kdf_ukm;
338 return dctx->kdf_ukmlen;
340 case EVP_PKEY_CTRL_MD:
341 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
342 EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
343 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
344 EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
345 EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
346 EVP_MD_type((const EVP_MD *)p2) != NID_sha512 &&
347 EVP_MD_type((const EVP_MD *)p2) != NID_sm3) {
348 ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
354 case EVP_PKEY_CTRL_GET_MD:
355 *(const EVP_MD **)p2 = dctx->md;
358 case EVP_PKEY_CTRL_PEER_KEY:
359 /* Default behaviour is OK */
360 case EVP_PKEY_CTRL_DIGESTINIT:
361 case EVP_PKEY_CTRL_PKCS7_SIGN:
362 case EVP_PKEY_CTRL_CMS_SIGN:
371 static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
372 const char *type, const char *value)
374 if (strcmp(type, "ec_paramgen_curve") == 0) {
376 nid = EC_curve_nist2nid(value);
377 if (nid == NID_undef)
378 nid = OBJ_sn2nid(value);
379 if (nid == NID_undef)
380 nid = OBJ_ln2nid(value);
381 if (nid == NID_undef) {
382 ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
385 return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
386 } else if (strcmp(type, "ec_param_enc") == 0) {
388 if (strcmp(value, "explicit") == 0)
390 else if (strcmp(value, "named_curve") == 0)
391 param_enc = OPENSSL_EC_NAMED_CURVE;
394 return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
395 } else if (strcmp(type, "ecdh_kdf_md") == 0) {
397 if ((md = EVP_get_digestbyname(value)) == NULL) {
398 ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_DIGEST);
401 return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md);
402 } else if (strcmp(type, "ecdh_cofactor_mode") == 0) {
404 co_mode = atoi(value);
405 return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode);
411 static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
414 EC_PKEY_CTX *dctx = ctx->data;
416 if (dctx->gen_group == NULL) {
417 ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
423 ret = EC_KEY_set_group(ec, dctx->gen_group);
425 EVP_PKEY_assign_EC_KEY(pkey, ec);
431 static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
434 EC_PKEY_CTX *dctx = ctx->data;
435 if (ctx->pkey == NULL && dctx->gen_group == NULL) {
436 ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
442 EVP_PKEY_assign_EC_KEY(pkey, ec);
444 /* Note: if error return, pkey is freed by parent routine */
445 if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
448 if (!EC_KEY_set_group(ec, dctx->gen_group))
451 return EC_KEY_generate_key(pkey->pkey.ec);
454 const EVP_PKEY_METHOD ec_pkey_meth = {
482 #ifndef OPENSSL_NO_EC