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);
131 ret = ECDSA_sign(type, tbs, tbslen, sig, &sltmp, ec);
136 *siglen = (size_t)sltmp;
140 static int pkey_ec_verify(EVP_PKEY_CTX *ctx,
141 const unsigned char *sig, size_t siglen,
142 const unsigned char *tbs, size_t tbslen)
145 EC_PKEY_CTX *dctx = ctx->data;
146 EC_KEY *ec = ctx->pkey->pkey.ec;
147 const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
150 type = EVP_MD_type(dctx->md);
154 if (ec_nid == NID_sm2) {
155 #if defined(OPENSSL_NO_SM2)
158 ret = SM2_verify(type, tbs, tbslen, sig, siglen, ec);
161 ret = ECDSA_verify(type, tbs, tbslen, sig, siglen, ec);
167 #ifndef OPENSSL_NO_EC
168 static int pkey_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
172 const EC_POINT *pubkey = NULL;
174 EC_PKEY_CTX *dctx = ctx->data;
175 if (!ctx->pkey || !ctx->peerkey) {
176 ECerr(EC_F_PKEY_EC_DERIVE, EC_R_KEYS_NOT_SET);
180 eckey = dctx->co_key ? dctx->co_key : ctx->pkey->pkey.ec;
183 const EC_GROUP *group;
184 group = EC_KEY_get0_group(eckey);
185 *keylen = (EC_GROUP_get_degree(group) + 7) / 8;
188 pubkey = EC_KEY_get0_public_key(ctx->peerkey->pkey.ec);
191 * NB: unlike PKCS#3 DH, if *outlen is less than maximum size this is not
192 * an error, the result is truncated.
197 ret = ECDH_compute_key(key, outlen, pubkey, eckey, 0);
204 static int pkey_ecies_encrypt(EVP_PKEY_CTX *ctx,
205 unsigned char *out, size_t *outlen,
206 const unsigned char *in, size_t inlen)
209 EC_PKEY_CTX *dctx = ctx->data;
210 EC_KEY *ec = ctx->pkey->pkey.ec;
211 const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
214 md_type = EVP_MD_type(dctx->md);
215 else if (ec_nid == NID_sm2)
218 md_type = NID_sha256;
220 if (ec_nid == NID_sm2) {
221 # if defined(OPENSSL_NO_SM2)
225 *outlen = SM2_ciphertext_size(ec, EVP_get_digestbynid(md_type), inlen);
229 ret = SM2_encrypt(ec, EVP_get_digestbynid(md_type),
230 in, inlen, out, outlen);
234 /* standard ECIES not implemented */
241 static int pkey_ecies_decrypt(EVP_PKEY_CTX *ctx,
242 unsigned char *out, size_t *outlen,
243 const unsigned char *in, size_t inlen)
246 EC_PKEY_CTX *dctx = ctx->data;
247 EC_KEY *ec = ctx->pkey->pkey.ec;
248 const int ec_nid = EC_GROUP_get_curve_name(EC_KEY_get0_group(ec));
251 md_type = EVP_MD_type(dctx->md);
252 else if (ec_nid == NID_sm2)
255 md_type = NID_sha256;
257 if (ec_nid == NID_sm2) {
258 # if defined(OPENSSL_NO_SM2)
262 *outlen = SM2_plaintext_size(ec, EVP_get_digestbynid(md_type), inlen);
266 ret = SM2_decrypt(ec, EVP_get_digestbynid(md_type),
267 in, inlen, out, outlen);
271 /* standard ECIES not implemented */
278 static int pkey_ec_kdf_derive(EVP_PKEY_CTX *ctx,
279 unsigned char *key, size_t *keylen)
281 EC_PKEY_CTX *dctx = ctx->data;
282 unsigned char *ktmp = NULL;
285 if (dctx->kdf_type == EVP_PKEY_ECDH_KDF_NONE)
286 return pkey_ec_derive(ctx, key, keylen);
288 *keylen = dctx->kdf_outlen;
291 if (*keylen != dctx->kdf_outlen)
293 if (!pkey_ec_derive(ctx, NULL, &ktmplen))
295 ktmp = OPENSSL_malloc(ktmplen);
298 if (!pkey_ec_derive(ctx, ktmp, &ktmplen))
301 if (!ECDH_KDF_X9_62(key, *keylen, ktmp, ktmplen,
302 dctx->kdf_ukm, dctx->kdf_ukmlen, dctx->kdf_md))
307 OPENSSL_clear_free(ktmp, ktmplen);
312 static int pkey_ec_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
314 EC_PKEY_CTX *dctx = ctx->data;
317 case EVP_PKEY_CTRL_EC_PARAMGEN_CURVE_NID:
318 group = EC_GROUP_new_by_curve_name(p1);
320 ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_CURVE);
323 EC_GROUP_free(dctx->gen_group);
324 dctx->gen_group = group;
327 case EVP_PKEY_CTRL_EC_PARAM_ENC:
328 if (!dctx->gen_group) {
329 ECerr(EC_F_PKEY_EC_CTRL, EC_R_NO_PARAMETERS_SET);
332 EC_GROUP_set_asn1_flag(dctx->gen_group, p1);
335 #ifndef OPENSSL_NO_EC
336 case EVP_PKEY_CTRL_EC_ECDH_COFACTOR:
338 if (dctx->cofactor_mode != -1)
339 return dctx->cofactor_mode;
341 EC_KEY *ec_key = ctx->pkey->pkey.ec;
342 return EC_KEY_get_flags(ec_key) & EC_FLAG_COFACTOR_ECDH ? 1 : 0;
344 } else if (p1 < -1 || p1 > 1)
346 dctx->cofactor_mode = p1;
348 EC_KEY *ec_key = ctx->pkey->pkey.ec;
351 /* If cofactor is 1 cofactor mode does nothing */
352 if (BN_is_one(ec_key->group->cofactor))
355 dctx->co_key = EC_KEY_dup(ec_key);
360 EC_KEY_set_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
362 EC_KEY_clear_flags(dctx->co_key, EC_FLAG_COFACTOR_ECDH);
364 EC_KEY_free(dctx->co_key);
370 case EVP_PKEY_CTRL_EC_KDF_TYPE:
372 return dctx->kdf_type;
373 if (p1 != EVP_PKEY_ECDH_KDF_NONE && p1 != EVP_PKEY_ECDH_KDF_X9_62)
378 case EVP_PKEY_CTRL_EC_KDF_MD:
382 case EVP_PKEY_CTRL_GET_EC_KDF_MD:
383 *(const EVP_MD **)p2 = dctx->kdf_md;
386 case EVP_PKEY_CTRL_EC_KDF_OUTLEN:
389 dctx->kdf_outlen = (size_t)p1;
392 case EVP_PKEY_CTRL_GET_EC_KDF_OUTLEN:
393 *(int *)p2 = dctx->kdf_outlen;
396 case EVP_PKEY_CTRL_EC_KDF_UKM:
397 OPENSSL_free(dctx->kdf_ukm);
400 dctx->kdf_ukmlen = p1;
402 dctx->kdf_ukmlen = 0;
405 case EVP_PKEY_CTRL_GET_EC_KDF_UKM:
406 *(unsigned char **)p2 = dctx->kdf_ukm;
407 return dctx->kdf_ukmlen;
409 case EVP_PKEY_CTRL_MD:
410 if (EVP_MD_type((const EVP_MD *)p2) != NID_sha1 &&
411 EVP_MD_type((const EVP_MD *)p2) != NID_ecdsa_with_SHA1 &&
412 EVP_MD_type((const EVP_MD *)p2) != NID_sha224 &&
413 EVP_MD_type((const EVP_MD *)p2) != NID_sha256 &&
414 EVP_MD_type((const EVP_MD *)p2) != NID_sha384 &&
415 EVP_MD_type((const EVP_MD *)p2) != NID_sha512 &&
416 EVP_MD_type((const EVP_MD *)p2) != NID_sm3) {
417 ECerr(EC_F_PKEY_EC_CTRL, EC_R_INVALID_DIGEST_TYPE);
423 case EVP_PKEY_CTRL_GET_MD:
424 *(const EVP_MD **)p2 = dctx->md;
427 case EVP_PKEY_CTRL_PEER_KEY:
428 /* Default behaviour is OK */
429 case EVP_PKEY_CTRL_DIGESTINIT:
430 case EVP_PKEY_CTRL_PKCS7_SIGN:
431 case EVP_PKEY_CTRL_CMS_SIGN:
440 static int pkey_ec_ctrl_str(EVP_PKEY_CTX *ctx,
441 const char *type, const char *value)
443 if (strcmp(type, "ec_paramgen_curve") == 0) {
445 nid = EC_curve_nist2nid(value);
446 if (nid == NID_undef)
447 nid = OBJ_sn2nid(value);
448 if (nid == NID_undef)
449 nid = OBJ_ln2nid(value);
450 if (nid == NID_undef) {
451 ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_CURVE);
454 return EVP_PKEY_CTX_set_ec_paramgen_curve_nid(ctx, nid);
455 } else if (strcmp(type, "ec_param_enc") == 0) {
457 if (strcmp(value, "explicit") == 0)
459 else if (strcmp(value, "named_curve") == 0)
460 param_enc = OPENSSL_EC_NAMED_CURVE;
463 return EVP_PKEY_CTX_set_ec_param_enc(ctx, param_enc);
464 } else if (strcmp(type, "ecdh_kdf_md") == 0) {
466 if ((md = EVP_get_digestbyname(value)) == NULL) {
467 ECerr(EC_F_PKEY_EC_CTRL_STR, EC_R_INVALID_DIGEST);
470 return EVP_PKEY_CTX_set_ecdh_kdf_md(ctx, md);
471 } else if (strcmp(type, "ecdh_cofactor_mode") == 0) {
473 co_mode = atoi(value);
474 return EVP_PKEY_CTX_set_ecdh_cofactor_mode(ctx, co_mode);
480 static int pkey_ec_paramgen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
483 EC_PKEY_CTX *dctx = ctx->data;
485 if (dctx->gen_group == NULL) {
486 ECerr(EC_F_PKEY_EC_PARAMGEN, EC_R_NO_PARAMETERS_SET);
492 ret = EC_KEY_set_group(ec, dctx->gen_group);
494 EVP_PKEY_assign_EC_KEY(pkey, ec);
500 static int pkey_ec_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
503 EC_PKEY_CTX *dctx = ctx->data;
504 if (ctx->pkey == NULL && dctx->gen_group == NULL) {
505 ECerr(EC_F_PKEY_EC_KEYGEN, EC_R_NO_PARAMETERS_SET);
511 EVP_PKEY_assign_EC_KEY(pkey, ec);
513 /* Note: if error return, pkey is freed by parent routine */
514 if (!EVP_PKEY_copy_parameters(pkey, ctx->pkey))
517 if (!EC_KEY_set_group(ec, dctx->gen_group))
520 return EC_KEY_generate_key(pkey->pkey.ec);
523 const EVP_PKEY_METHOD ec_pkey_meth = {
553 #ifndef OPENSSL_NO_EC