1 /**********************************************************************
4 * Copyright (c) 2005-2013 Cryptocom LTD *
5 * Copyright (c) 2018,2020 Dmitry Belyavskiy <beldmit@gmail.com> *
6 * Copyright (c) 2020 Billy Brumley <bbrumley@gmail.com> *
8 * This file is distributed under the same license as OpenSSL *
10 * VK0 R 50.1.113-2016 / RFC 7836 *
11 * KEG R 1323565.1.020-2018 *
12 * VK0 34.10-2001 key exchange and GOST R 34.10-2001 (RFC 4357) *
13 * based PKCS7/SMIME support *
14 * Requires OpenSSL 0.9.9 for compilation *
15 **********************************************************************/
16 #include <openssl/evp.h>
17 #include <openssl/err.h>
18 #include <openssl/rand.h>
20 #include <openssl/objects.h>
22 #include "e_gost_err.h"
23 #include "gost_keywrap.h"
26 /* Implementation of CryptoPro VKO 34.10-2001/2012 algorithm */
27 int VKO_compute_key(unsigned char *shared_key,
28 const EC_POINT *pub_key, const EC_KEY *priv_key,
29 const unsigned char *ukm, const size_t ukm_size,
30 const int vko_dgst_nid)
32 unsigned char *databuf = NULL;
33 BIGNUM *scalar = NULL, *X = NULL, *Y = NULL;
34 const EC_GROUP *grp = NULL;
37 EVP_MD_CTX *mdctx = NULL;
38 const EVP_MD *md = NULL;
39 int buf_len, half_len;
42 if ((ctx = BN_CTX_secure_new()) == NULL) {
43 GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
48 md = EVP_get_digestbynid(vko_dgst_nid);
50 GOSTerr(GOST_F_VKO_COMPUTE_KEY, GOST_R_INVALID_DIGEST_TYPE);
54 grp = EC_KEY_get0_group(priv_key);
55 scalar = BN_CTX_get(ctx);
58 if ((Y = BN_CTX_get(ctx)) == NULL
59 || (pnt = EC_POINT_new(grp)) == NULL
60 || BN_lebin2bn(ukm, ukm_size, scalar) == NULL
61 || !BN_mod_mul(scalar, scalar, EC_KEY_get0_private_key(priv_key),
62 EC_GROUP_get0_order(grp), ctx))
65 /* these two curves have cofactor 4; the rest have cofactor 1 */
66 switch (EC_GROUP_get_curve_name(grp)) {
67 case NID_id_tc26_gost_3410_2012_256_paramSetA:
68 case NID_id_tc26_gost_3410_2012_512_paramSetC:
69 if (!BN_lshift(scalar, scalar, 2))
74 if (!gost_ec_point_mul(grp, pnt, NULL, pub_key, scalar, ctx)) {
75 GOSTerr(GOST_F_VKO_COMPUTE_KEY, GOST_R_ERROR_POINT_MUL);
78 if (!EC_POINT_get_affine_coordinates(grp, pnt, X, Y, ctx)) {
79 GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_EC_LIB);
83 half_len = BN_num_bytes(EC_GROUP_get0_field(grp));
84 buf_len = 2 * half_len;
85 if ((databuf = OPENSSL_malloc(buf_len)) == NULL) {
86 GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
91 * Serialize elliptic curve point same way as we do it when saving key
93 if (BN_bn2lebinpad(X, databuf, half_len) != half_len
94 || BN_bn2lebinpad(Y, databuf + half_len, half_len) != half_len)
97 if ((mdctx = EVP_MD_CTX_new()) == NULL) {
98 GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_MALLOC_FAILURE);
102 if (EVP_MD_CTX_init(mdctx) == 0
103 || EVP_DigestInit_ex(mdctx, md, NULL) == 0
104 || EVP_DigestUpdate(mdctx, databuf, buf_len) == 0
105 || EVP_DigestFinal_ex(mdctx, shared_key, NULL) == 0) {
106 GOSTerr(GOST_F_VKO_COMPUTE_KEY, ERR_R_EVP_LIB);
110 ret = (EVP_MD_size(md) > 0) ? EVP_MD_size(md) : 0;
116 EVP_MD_CTX_free(mdctx);
117 OPENSSL_free(databuf);
123 * KEG Algorithm described in R 1323565.1.020-2018 6.4.5.1.
124 * keyout expected to be 64 bytes
126 static int gost_keg(const unsigned char *ukm_source, int pkey_nid,
127 const EC_POINT *pub_key, const EC_KEY *priv_key,
128 unsigned char *keyout)
131 unsigned char real_ukm[16];
134 memset(real_ukm, 0, 16);
135 if (memcmp(ukm_source, real_ukm, 16) == 0)
138 memcpy(real_ukm, ukm_source, 16);
139 BUF_reverse(real_ukm, NULL, 16);
143 case NID_id_GostR3410_2012_512:
145 VKO_compute_key(keyout, pub_key, priv_key, real_ukm, 16,
146 NID_id_GostR3411_2012_512);
147 return (keylen) ? keylen : 0;
150 case NID_id_GostR3410_2012_256:
152 unsigned char tmpkey[32];
154 VKO_compute_key(tmpkey, pub_key, priv_key, real_ukm, 16,
155 NID_id_GostR3411_2012_256);
160 if (gost_kdftree2012_256
161 (keyout, 64, tmpkey, 32, (const unsigned char *)"kdf tree", 8,
162 ukm_source + 16, 8, 1) > 0)
167 OPENSSL_cleanse(tmpkey, 32);
168 return (keylen) ? keylen : 0;
176 * EVP_PKEY_METHOD callback derive.
177 * Implements VKO R 34.10-2001/2012 algorithms
180 * Backend for EVP_PKEY_derive()
181 * It have KEG mode (default) and VKO mode (enable by EVP_PKEY_CTRL_SET_VKO).
183 int pkey_gost_ec_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
186 * Public key of peer in the ctx field peerkey
187 * Our private key in the ctx pkey
188 * ukm is in the algorithm specific context data
190 EVP_PKEY *my_key = EVP_PKEY_CTX_get0_pkey(ctx);
191 EVP_PKEY *peer_key = EVP_PKEY_CTX_get0_peerkey(ctx);
192 struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
193 int dgst_nid = NID_undef;
195 if (!data || data->shared_ukm_size == 0) {
196 GOSTerr(GOST_F_PKEY_GOST_EC_DERIVE, GOST_R_UKM_NOT_SET);
201 if (data->vko_dgst_nid) {
203 *keylen = data->vko_dgst_nid == NID_id_GostR3411_2012_256? 32 : 64;
206 *keylen = VKO_compute_key(key,
207 EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
208 (EC_KEY *)EVP_PKEY_get0(my_key),
209 data->shared_ukm, data->shared_ukm_size,
211 return (*keylen) ? 1 : 0;
215 * shared_ukm_size = 8 stands for pre-2018 cipher suites
216 * It means 32 bytes of key length, 8 byte UKM, 32-bytes hash
218 * shared_ukm_size = 32 stands for post-2018 cipher suites
219 * It means 64 bytes of shared_key, 16 bytes of UKM and either
220 * 64 bytes of hash or 64 bytes of TLSTREE output
223 switch (data->shared_ukm_size) {
230 EVP_PKEY_get_default_digest_nid(my_key, &dgst_nid);
231 if (dgst_nid == NID_id_GostR3411_2012_512)
232 dgst_nid = NID_id_GostR3411_2012_256;
236 EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
237 (EC_KEY *)EVP_PKEY_get0(my_key),
238 data->shared_ukm, 8, dgst_nid);
239 return (*keylen) ? 1 : 0;
249 *keylen = gost_keg(data->shared_ukm, EVP_PKEY_id(my_key),
250 EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
251 (EC_KEY *)EVP_PKEY_get0(my_key), key);
252 return (*keylen) ? 1 : 0;
262 * Generates ephemeral key based on pubk algorithm computes shared key using
263 * VKO and returns filled up GOST_KEY_TRANSPORT structure
267 * EVP_PKEY_METHOD callback encrypt
268 * Implementation of GOST2001/12 key transport, cryptopro variation
271 static int pkey_GOST_ECcp_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out,
272 size_t *out_len, const unsigned char *key,
275 GOST_KEY_TRANSPORT *gkt = NULL;
276 EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
277 struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
278 int pkey_nid = EVP_PKEY_base_id(pubk);
279 ASN1_OBJECT *crypt_params_obj = (pkey_nid == NID_id_GostR3410_2001 || pkey_nid == NID_id_GostR3410_2001DH) ?
280 OBJ_nid2obj(NID_id_Gost28147_89_CryptoPro_A_ParamSet) :
281 OBJ_nid2obj(NID_id_tc26_gost_28147_param_Z);
282 const struct gost_cipher_info *param =
283 get_encryption_params(crypt_params_obj);
284 unsigned char ukm[8], shared_key[32], crypted_key[44];
286 int key_is_ephemeral = 1;
288 EVP_PKEY *sec_key = EVP_PKEY_CTX_get0_peerkey(pctx);
289 if (data->shared_ukm_size) {
290 memcpy(ukm, data->shared_ukm, 8);
292 if (RAND_bytes(ukm, 8) <= 0) {
293 GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT, GOST_R_RNG_ERROR);
299 /* Check for private key in the peer_key of context */
301 key_is_ephemeral = 0;
302 if (!gost_get0_priv_key(sec_key)) {
303 GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT,
304 GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
308 key_is_ephemeral = 1;
310 sec_key = EVP_PKEY_new();
311 if (!EVP_PKEY_assign(sec_key, EVP_PKEY_base_id(pubk), EC_KEY_new())
312 || !EVP_PKEY_copy_parameters(sec_key, pubk)
313 || !gost_ec_keygen(EVP_PKEY_get0(sec_key))) {
314 GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT,
315 GOST_R_ERROR_COMPUTING_SHARED_KEY);
321 int dgst_nid = NID_undef;
322 EVP_PKEY_get_default_digest_nid(pubk, &dgst_nid);
323 if (dgst_nid == NID_id_GostR3411_2012_512)
324 dgst_nid = NID_id_GostR3411_2012_256;
326 if (!VKO_compute_key(shared_key,
327 EC_KEY_get0_public_key(EVP_PKEY_get0(pubk)),
328 EVP_PKEY_get0(sec_key), ukm, 8, dgst_nid)) {
329 GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT,
330 GOST_R_ERROR_COMPUTING_SHARED_KEY);
333 gost_init(&cctx, param->sblock);
334 keyWrapCryptoPro(&cctx, shared_key, ukm, key, crypted_key);
336 gkt = GOST_KEY_TRANSPORT_new();
340 if (!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv, ukm, 8)) {
343 if (!ASN1_OCTET_STRING_set(gkt->key_info->imit, crypted_key + 40, 4)) {
346 if (!ASN1_OCTET_STRING_set
347 (gkt->key_info->encrypted_key, crypted_key + 8, 32)) {
350 if (key_is_ephemeral) {
352 (&gkt->key_agreement_info->ephem_key, out ? sec_key : pubk)) {
353 GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT,
354 GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
358 ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
359 gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
360 if (key_is_ephemeral)
361 EVP_PKEY_free(sec_key);
362 if (!key_is_ephemeral) {
363 /* Set control "public key from client certificate used" */
364 if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL)
366 GOSTerr(GOST_F_PKEY_GOST_ECCP_ENCRYPT, GOST_R_CTRL_CALL_FAILED);
370 if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL)) > 0)
372 OPENSSL_cleanse(shared_key, sizeof(shared_key));
373 GOST_KEY_TRANSPORT_free(gkt);
376 OPENSSL_cleanse(shared_key, sizeof(shared_key));
377 if (key_is_ephemeral)
378 EVP_PKEY_free(sec_key);
379 GOST_KEY_TRANSPORT_free(gkt);
384 * EVP_PKEY_METHOD callback decrypt
385 * Implementation of GOST2018 key transport
387 static int pkey_gost2018_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out,
388 size_t *out_len, const unsigned char *key,
391 PSKeyTransport_gost *pst = NULL;
392 EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
393 struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
394 int pkey_nid = EVP_PKEY_base_id(pubk);
395 unsigned char expkeys[64];
396 EVP_PKEY *sec_key = NULL;
398 int mac_nid = NID_undef;
400 int exp_len = 0, iv_len = 0;
401 unsigned char *exp_buf = NULL;
402 int key_is_ephemeral = 0;
404 switch (data->cipher_nid) {
406 mac_nid = NID_magma_mac;
410 case NID_grasshopper_ctr:
411 mac_nid = NID_grasshopper_mac;
416 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, GOST_R_INVALID_CIPHER);
420 exp_len = key_len + mac_len;
421 exp_buf = OPENSSL_malloc(exp_len);
423 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE);
427 sec_key = EVP_PKEY_CTX_get0_peerkey(pctx);
430 sec_key = EVP_PKEY_new();
431 if (sec_key == NULL) {
432 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE );
436 if (!EVP_PKEY_assign(sec_key, EVP_PKEY_base_id(pubk), EC_KEY_new())
437 || !EVP_PKEY_copy_parameters(sec_key, pubk)
438 || !gost_ec_keygen(EVP_PKEY_get0(sec_key))) {
439 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT,
440 GOST_R_ERROR_COMPUTING_SHARED_KEY);
443 key_is_ephemeral = 1;
446 if (data->shared_ukm_size == 0) {
447 if (RAND_bytes(data->shared_ukm, 32) <= 0) {
448 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_INTERNAL_ERROR);
451 data->shared_ukm_size = 32;
454 if (gost_keg(data->shared_ukm, pkey_nid,
455 EC_KEY_get0_public_key(EVP_PKEY_get0(pubk)),
456 EVP_PKEY_get0(sec_key), expkeys) <= 0) {
457 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT,
458 GOST_R_ERROR_COMPUTING_EXPORT_KEYS);
462 if (gost_kexp15(key, key_len, data->cipher_nid, expkeys + 32,
463 mac_nid, expkeys + 0, data->shared_ukm + 24, iv_len,
464 exp_buf, &exp_len) <= 0) {
465 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
469 pst = PSKeyTransport_gost_new();
471 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE);
475 pst->ukm = ASN1_OCTET_STRING_new();
476 if (pst->ukm == NULL) {
477 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE);
481 if (!ASN1_OCTET_STRING_set(pst->ukm, data->shared_ukm, data->shared_ukm_size)) {
482 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE);
486 if (!ASN1_OCTET_STRING_set(pst->psexp, exp_buf, exp_len)) {
487 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, ERR_R_MALLOC_FAILURE);
491 if (!X509_PUBKEY_set(&pst->ephem_key, out ? sec_key : pubk)) {
492 GOSTerr(GOST_F_PKEY_GOST2018_ENCRYPT, GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
496 if ((*out_len = i2d_PSKeyTransport_gost(pst, out ? &out : NULL)) > 0)
499 OPENSSL_cleanse(expkeys, sizeof(expkeys));
500 if (key_is_ephemeral)
501 EVP_PKEY_free(sec_key);
503 PSKeyTransport_gost_free(pst);
504 OPENSSL_free(exp_buf);
508 int pkey_gost_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out,
509 size_t *out_len, const unsigned char *key, size_t key_len)
511 struct gost_pmeth_data *gctx = EVP_PKEY_CTX_get_data(pctx);
512 switch (gctx->cipher_nid)
514 case NID_id_Gost28147_89:
515 case NID_undef: /* FIXME */
516 return pkey_GOST_ECcp_encrypt(pctx, out, out_len, key, key_len);
518 case NID_kuznyechik_ctr:
520 return pkey_gost2018_encrypt(pctx, out, out_len, key, key_len);
523 GOSTerr(GOST_F_PKEY_GOST_ENCRYPT, ERR_R_INTERNAL_ERROR);
529 * EVP_PKEY_METHOD callback decrypt
530 * Implementation of GOST2001/12 key transport, cryptopro variation
532 static int pkey_GOST_ECcp_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key,
533 size_t *key_len, const unsigned char *in,
536 const unsigned char *p = in;
537 EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(pctx);
538 GOST_KEY_TRANSPORT *gkt = NULL;
540 unsigned char wrappedKey[44];
541 unsigned char sharedKey[32];
543 const struct gost_cipher_info *param = NULL;
544 EVP_PKEY *eph_key = NULL, *peerkey = NULL;
545 int dgst_nid = NID_undef;
551 gkt = d2i_GOST_KEY_TRANSPORT(NULL, (const unsigned char **)&p, in_len);
553 GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT,
554 GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
558 /* If key transport structure contains public key, use it */
559 eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
561 if (EVP_PKEY_derive_set_peer(pctx, eph_key) <= 0) {
562 GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT,
563 GOST_R_INCOMPATIBLE_PEER_KEY);
567 /* Set control "public key from client certificate used" */
568 if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL)
570 GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT, GOST_R_CTRL_CALL_FAILED);
574 peerkey = EVP_PKEY_CTX_get0_peerkey(pctx);
576 GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT, GOST_R_NO_PEER_KEY);
580 param = get_encryption_params(gkt->key_agreement_info->cipher);
585 gost_init(&ctx, param->sblock);
586 OPENSSL_assert(gkt->key_agreement_info->eph_iv->length == 8);
587 memcpy(wrappedKey, gkt->key_agreement_info->eph_iv->data, 8);
588 OPENSSL_assert(gkt->key_info->encrypted_key->length == 32);
589 memcpy(wrappedKey + 8, gkt->key_info->encrypted_key->data, 32);
590 OPENSSL_assert(gkt->key_info->imit->length == 4);
591 memcpy(wrappedKey + 40, gkt->key_info->imit->data, 4);
593 EVP_PKEY_get_default_digest_nid(priv, &dgst_nid);
594 if (dgst_nid == NID_id_GostR3411_2012_512)
595 dgst_nid = NID_id_GostR3411_2012_256;
597 if (!VKO_compute_key(sharedKey,
598 EC_KEY_get0_public_key(EVP_PKEY_get0(peerkey)),
599 EVP_PKEY_get0(priv), wrappedKey, 8, dgst_nid)) {
600 GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT,
601 GOST_R_ERROR_COMPUTING_SHARED_KEY);
604 if (!keyUnwrapCryptoPro(&ctx, sharedKey, wrappedKey, key)) {
605 GOSTerr(GOST_F_PKEY_GOST_ECCP_DECRYPT,
606 GOST_R_ERROR_COMPUTING_SHARED_KEY);
612 OPENSSL_cleanse(sharedKey, sizeof(sharedKey));
613 EVP_PKEY_free(eph_key);
614 GOST_KEY_TRANSPORT_free(gkt);
619 * EVP_PKEY_METHOD callback decrypt
620 * Implementation of GOST2018 key transport
622 static int pkey_gost2018_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key,
623 size_t *key_len, const unsigned char *in,
626 const unsigned char *p = in;
627 struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
628 EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(pctx);
629 PSKeyTransport_gost *pst = NULL;
631 unsigned char expkeys[64];
632 EVP_PKEY *eph_key = NULL;
633 int pkey_nid = EVP_PKEY_base_id(priv);
634 int mac_nid = NID_undef;
637 switch (data->cipher_nid) {
639 mac_nid = NID_magma_mac;
642 case NID_grasshopper_ctr:
643 mac_nid = NID_grasshopper_mac;
647 GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT, GOST_R_INVALID_CIPHER);
656 pst = d2i_PSKeyTransport_gost(NULL, (const unsigned char **)&p, in_len);
658 GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT,
659 GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
663 eph_key = X509_PUBKEY_get(pst->ephem_key);
666 1. Checks the next three conditions fulfilling and terminates the
667 connection with fatal error if not.
669 o Q_eph is on the same curve as server public key;
671 o Q_eph is not equal to zero point;
673 o q * Q_eph is not equal to zero point.
675 if (data->shared_ukm_size == 0 && pst->ukm != NULL) {
676 if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_SET_IV,
677 ASN1_STRING_length(pst->ukm), (void *)ASN1_STRING_get0_data(pst->ukm)) < 0) {
678 GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT, GOST_R_UKM_NOT_SET);
683 if (gost_keg(data->shared_ukm, pkey_nid,
684 EC_KEY_get0_public_key(EVP_PKEY_get0(eph_key)),
685 EVP_PKEY_get0(priv), expkeys) <= 0) {
686 GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT,
687 GOST_R_ERROR_COMPUTING_EXPORT_KEYS);
691 if (gost_kimp15(ASN1_STRING_get0_data(pst->psexp),
692 ASN1_STRING_length(pst->psexp), data->cipher_nid,
693 expkeys + 32, mac_nid, expkeys + 0, data->shared_ukm + 24,
695 GOSTerr(GOST_F_PKEY_GOST2018_DECRYPT, GOST_R_CANNOT_UNPACK_EPHEMERAL_KEY);
701 OPENSSL_cleanse(expkeys, sizeof(expkeys));
702 EVP_PKEY_free(eph_key);
703 PSKeyTransport_gost_free(pst);
707 int pkey_gost_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key,
708 size_t *key_len, const unsigned char *in, size_t in_len)
710 struct gost_pmeth_data *gctx = EVP_PKEY_CTX_get_data(pctx);
711 switch (gctx->cipher_nid)
713 case NID_id_Gost28147_89:
714 case NID_undef: /* FIXME */
715 return pkey_GOST_ECcp_decrypt(pctx, key, key_len, in, in_len);
716 case NID_kuznyechik_ctr:
718 return pkey_gost2018_decrypt(pctx, key, key_len, in, in_len);
720 GOSTerr(GOST_F_PKEY_GOST_DECRYPT, ERR_R_INTERNAL_ERROR);
724 /* vim: set expandtab cinoptions=\:0,l1,t0,g0,(0 sw=4 : */