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gost2001_keyx.c (256281) gost2001_keyx.c (280304)
1/**********************************************************************
2 * gost_keyx.c *
3 * Copyright (c) 2005-2006 Cryptocom LTD *
4 * This file is distributed under the same license as OpenSSL *
5 * *
6 * VK0 34.10-2001 key exchange and GOST R 34.10-2001 *
7 * based PKCS7/SMIME support *
8 * Requires OpenSSL 0.9.9 for compilation *

--- 4 unchanged lines hidden (view full) ---

13#include <openssl/objects.h>
14#include "gost89.h"
15#include "gosthash.h"
16#include "e_gost_err.h"
17#include "gost_keywrap.h"
18#include "gost_lcl.h"
19#include "gost2001_keyx.h"
20
1/**********************************************************************
2 * gost_keyx.c *
3 * Copyright (c) 2005-2006 Cryptocom LTD *
4 * This file is distributed under the same license as OpenSSL *
5 * *
6 * VK0 34.10-2001 key exchange and GOST R 34.10-2001 *
7 * based PKCS7/SMIME support *
8 * Requires OpenSSL 0.9.9 for compilation *

--- 4 unchanged lines hidden (view full) ---

13#include <openssl/objects.h>
14#include "gost89.h"
15#include "gosthash.h"
16#include "e_gost_err.h"
17#include "gost_keywrap.h"
18#include "gost_lcl.h"
19#include "gost2001_keyx.h"
20
21
22
23/* Implementation of CryptoPro VKO 34.10-2001 algorithm */
21/* Implementation of CryptoPro VKO 34.10-2001 algorithm */
24static int VKO_compute_key(unsigned char *shared_key,size_t shared_key_size,const EC_POINT *pub_key,EC_KEY *priv_key,const unsigned char *ukm)
25 {
26 unsigned char ukm_be[8],databuf[64],hashbuf[64];
27 BIGNUM *UKM=NULL,*p=NULL,*order=NULL,*X=NULL,*Y=NULL;
28 const BIGNUM* key=EC_KEY_get0_private_key(priv_key);
29 EC_POINT *pnt=EC_POINT_new(EC_KEY_get0_group(priv_key));
30 int i;
31 gost_hash_ctx hash_ctx;
32 BN_CTX *ctx = BN_CTX_new();
22static int VKO_compute_key(unsigned char *shared_key, size_t shared_key_size,
23 const EC_POINT *pub_key, EC_KEY *priv_key,
24 const unsigned char *ukm)
25{
26 unsigned char ukm_be[8], databuf[64], hashbuf[64];
27 BIGNUM *UKM = NULL, *p = NULL, *order = NULL, *X = NULL, *Y = NULL;
28 const BIGNUM *key = EC_KEY_get0_private_key(priv_key);
29 EC_POINT *pnt = EC_POINT_new(EC_KEY_get0_group(priv_key));
30 int i;
31 gost_hash_ctx hash_ctx;
32 BN_CTX *ctx = BN_CTX_new();
33
33
34 for (i=0;i<8;i++)
35 {
36 ukm_be[7-i]=ukm[i];
37 }
38 BN_CTX_start(ctx);
39 UKM=getbnfrombuf(ukm_be,8);
40 p=BN_CTX_get(ctx);
41 order = BN_CTX_get(ctx);
42 X=BN_CTX_get(ctx);
43 Y=BN_CTX_get(ctx);
44 EC_GROUP_get_order(EC_KEY_get0_group(priv_key),order,ctx);
45 BN_mod_mul(p,key,UKM,order,ctx);
46 EC_POINT_mul(EC_KEY_get0_group(priv_key),pnt,NULL,pub_key,p,ctx);
47 EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(priv_key),
48 pnt,X,Y,ctx);
49 /*Serialize elliptic curve point same way as we do it when saving
50 * key */
51 store_bignum(Y,databuf,32);
52 store_bignum(X,databuf+32,32);
53 /* And reverse byte order of whole buffer */
54 for (i=0;i<64;i++)
55 {
56 hashbuf[63-i]=databuf[i];
57 }
58 init_gost_hash_ctx(&hash_ctx,&GostR3411_94_CryptoProParamSet);
59 start_hash(&hash_ctx);
60 hash_block(&hash_ctx,hashbuf,64);
61 finish_hash(&hash_ctx,shared_key);
62 done_gost_hash_ctx(&hash_ctx);
63 BN_free(UKM);
64 BN_CTX_end(ctx);
65 BN_CTX_free(ctx);
66 EC_POINT_free(pnt);
67 return 32;
68 }
34 for (i = 0; i < 8; i++) {
35 ukm_be[7 - i] = ukm[i];
36 }
37 BN_CTX_start(ctx);
38 UKM = getbnfrombuf(ukm_be, 8);
39 p = BN_CTX_get(ctx);
40 order = BN_CTX_get(ctx);
41 X = BN_CTX_get(ctx);
42 Y = BN_CTX_get(ctx);
43 EC_GROUP_get_order(EC_KEY_get0_group(priv_key), order, ctx);
44 BN_mod_mul(p, key, UKM, order, ctx);
45 EC_POINT_mul(EC_KEY_get0_group(priv_key), pnt, NULL, pub_key, p, ctx);
46 EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(priv_key),
47 pnt, X, Y, ctx);
48 /*
49 * Serialize elliptic curve point same way as we do it when saving key
50 */
51 store_bignum(Y, databuf, 32);
52 store_bignum(X, databuf + 32, 32);
53 /* And reverse byte order of whole buffer */
54 for (i = 0; i < 64; i++) {
55 hashbuf[63 - i] = databuf[i];
56 }
57 init_gost_hash_ctx(&hash_ctx, &GostR3411_94_CryptoProParamSet);
58 start_hash(&hash_ctx);
59 hash_block(&hash_ctx, hashbuf, 64);
60 finish_hash(&hash_ctx, shared_key);
61 done_gost_hash_ctx(&hash_ctx);
62 BN_free(UKM);
63 BN_CTX_end(ctx);
64 BN_CTX_free(ctx);
65 EC_POINT_free(pnt);
66 return 32;
67}
69
68
70
71/*
72 * EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-2001
73 * algorithm
74 */
69/*
70 * EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-2001
71 * algorithm
72 */
75int pkey_gost2001_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
73int pkey_gost2001_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
74 size_t *keylen)
76{
75{
77 /* Public key of peer in the ctx field peerkey
78 * Our private key in the ctx pkey
79 * ukm is in the algorithm specific context data
80 */
81 EVP_PKEY *my_key = EVP_PKEY_CTX_get0_pkey(ctx);
82 EVP_PKEY *peer_key = EVP_PKEY_CTX_get0_peerkey(ctx);
83 struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
84
85 if (!data->shared_ukm) {
86 GOSTerr(GOST_F_PKEY_GOST2001_DERIVE, GOST_R_UKM_NOT_SET);
87 return 0;
88 }
76 /*
77 * Public key of peer in the ctx field peerkey Our private key in the ctx
78 * pkey ukm is in the algorithm specific context data
79 */
80 EVP_PKEY *my_key = EVP_PKEY_CTX_get0_pkey(ctx);
81 EVP_PKEY *peer_key = EVP_PKEY_CTX_get0_peerkey(ctx);
82 struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
89
83
90 if (key == NULL) {
91 *keylen = 32;
92 return 32;
93 }
94
95 *keylen=VKO_compute_key(key, 32, EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
96 (EC_KEY *)EVP_PKEY_get0(my_key),data->shared_ukm);
97 return 1;
98}
84 if (!data->shared_ukm) {
85 GOSTerr(GOST_F_PKEY_GOST2001_DERIVE, GOST_R_UKM_NOT_SET);
86 return 0;
87 }
99
88
89 if (key == NULL) {
90 *keylen = 32;
91 return 32;
92 }
100
93
94 *keylen =
95 VKO_compute_key(key, 32,
96 EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
97 (EC_KEY *)EVP_PKEY_get0(my_key), data->shared_ukm);
98 return 1;
99}
101
100
102
103/*
104 * EVP_PKEY_METHOD callback encrypt
105 * Implementation of GOST2001 key transport, cryptocom variation
101/*
102 * EVP_PKEY_METHOD callback encrypt
103 * Implementation of GOST2001 key transport, cryptocom variation
106 */
104 */
107/* Generates ephemeral key based on pubk algorithm
108 * computes shared key using VKO and returns filled up
109 * GOST_KEY_TRANSPORT structure
105/*
106 * Generates ephemeral key based on pubk algorithm computes shared key using
107 * VKO and returns filled up GOST_KEY_TRANSPORT structure
110 */
111
108 */
109
112/*
113 * EVP_PKEY_METHOD callback encrypt
114 * Implementation of GOST2001 key transport, cryptopo variation
110/*
111 * EVP_PKEY_METHOD callback encrypt
112 * Implementation of GOST2001 key transport, cryptopo variation
115 */
116
113 */
114
117int pkey_GOST01cp_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out, size_t *out_len, const unsigned char *key,size_t key_len)
118 {
119 GOST_KEY_TRANSPORT *gkt=NULL;
120 EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
121 struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
122 const struct gost_cipher_info *param=get_encryption_params(NULL);
123 unsigned char ukm[8], shared_key[32], crypted_key[44];
124 int ret=0;
125 int key_is_ephemeral=1;
126 gost_ctx cctx;
127 EVP_PKEY *sec_key=EVP_PKEY_CTX_get0_peerkey(pctx);
128 if (data->shared_ukm)
129 {
130 memcpy(ukm, data->shared_ukm,8);
131 }
132 else if (out)
133 {
134
135 if (RAND_bytes(ukm,8)<=0)
136 {
137 GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
138 GOST_R_RANDOM_GENERATOR_FAILURE);
139 return 0;
140 }
141 }
142 /* Check for private key in the peer_key of context */
143 if (sec_key)
144 {
145 key_is_ephemeral=0;
146 if (!gost_get0_priv_key(sec_key))
147 {
148 GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
149 GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
150 goto err;
151 }
152 }
153 else
154 {
155 key_is_ephemeral=1;
156 if (out)
157 {
158 sec_key = EVP_PKEY_new();
159 EVP_PKEY_assign(sec_key,EVP_PKEY_base_id(pubk),EC_KEY_new());
160 EVP_PKEY_copy_parameters(sec_key,pubk);
161 if (!gost2001_keygen(EVP_PKEY_get0(sec_key)))
162 {
163 goto err;
164 }
165 }
166 }
167 if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS) && param == gost_cipher_list)
168 {
169 param= gost_cipher_list+1;
170 }
171 if (out)
172 {
173 VKO_compute_key(shared_key,32,EC_KEY_get0_public_key(EVP_PKEY_get0(pubk)),EVP_PKEY_get0(sec_key),ukm);
174 gost_init(&cctx,param->sblock);
175 keyWrapCryptoPro(&cctx,shared_key,ukm,key,crypted_key);
176 }
177 gkt = GOST_KEY_TRANSPORT_new();
178 if (!gkt)
179 {
180 goto err;
181 }
182 if(!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv,
183 ukm,8))
184 {
185 goto err;
186 }
187 if (!ASN1_OCTET_STRING_set(gkt->key_info->imit,crypted_key+40,4))
188 {
189 goto err;
190 }
191 if (!ASN1_OCTET_STRING_set(gkt->key_info->encrypted_key,crypted_key+8,32))
192 {
193 goto err;
194 }
195 if (key_is_ephemeral) {
196 if (!X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,out?sec_key:pubk))
197 {
198 GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
199 GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
200 goto err;
201 }
202 }
203 ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
204 gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
205 if (key_is_ephemeral && sec_key) EVP_PKEY_free(sec_key);
206 if (!key_is_ephemeral)
207 {
208 /* Set control "public key from client certificate used" */
209 if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <= 0)
210 {
211 GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
212 GOST_R_CTRL_CALL_FAILED);
213 goto err;
214 }
215 }
216 if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt,out?&out:NULL))>0) ret =1;
217 GOST_KEY_TRANSPORT_free(gkt);
218 return ret;
219 err:
220 if (key_is_ephemeral && sec_key) EVP_PKEY_free(sec_key);
221 GOST_KEY_TRANSPORT_free(gkt);
222 return -1;
223 }
224/*
225 * EVP_PKEY_METHOD callback decrypt
226 * Implementation of GOST2001 key transport, cryptopo variation
115int pkey_GOST01cp_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out,
116 size_t *out_len, const unsigned char *key,
117 size_t key_len)
118{
119 GOST_KEY_TRANSPORT *gkt = NULL;
120 EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
121 struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
122 const struct gost_cipher_info *param = get_encryption_params(NULL);
123 unsigned char ukm[8], shared_key[32], crypted_key[44];
124 int ret = 0;
125 int key_is_ephemeral = 1;
126 gost_ctx cctx;
127 EVP_PKEY *sec_key = EVP_PKEY_CTX_get0_peerkey(pctx);
128 if (data->shared_ukm) {
129 memcpy(ukm, data->shared_ukm, 8);
130 } else if (out) {
131
132 if (RAND_bytes(ukm, 8) <= 0) {
133 GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
134 GOST_R_RANDOM_GENERATOR_FAILURE);
135 return 0;
136 }
137 }
138 /* Check for private key in the peer_key of context */
139 if (sec_key) {
140 key_is_ephemeral = 0;
141 if (!gost_get0_priv_key(sec_key)) {
142 GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
143 GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
144 goto err;
145 }
146 } else {
147 key_is_ephemeral = 1;
148 if (out) {
149 sec_key = EVP_PKEY_new();
150 EVP_PKEY_assign(sec_key, EVP_PKEY_base_id(pubk), EC_KEY_new());
151 EVP_PKEY_copy_parameters(sec_key, pubk);
152 if (!gost2001_keygen(EVP_PKEY_get0(sec_key))) {
153 goto err;
154 }
155 }
156 }
157 if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS)
158 && param == gost_cipher_list) {
159 param = gost_cipher_list + 1;
160 }
161 if (out) {
162 VKO_compute_key(shared_key, 32,
163 EC_KEY_get0_public_key(EVP_PKEY_get0(pubk)),
164 EVP_PKEY_get0(sec_key), ukm);
165 gost_init(&cctx, param->sblock);
166 keyWrapCryptoPro(&cctx, shared_key, ukm, key, crypted_key);
167 }
168 gkt = GOST_KEY_TRANSPORT_new();
169 if (!gkt) {
170 goto err;
171 }
172 if (!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv, ukm, 8)) {
173 goto err;
174 }
175 if (!ASN1_OCTET_STRING_set(gkt->key_info->imit, crypted_key + 40, 4)) {
176 goto err;
177 }
178 if (!ASN1_OCTET_STRING_set
179 (gkt->key_info->encrypted_key, crypted_key + 8, 32)) {
180 goto err;
181 }
182 if (key_is_ephemeral) {
183 if (!X509_PUBKEY_set
184 (&gkt->key_agreement_info->ephem_key, out ? sec_key : pubk)) {
185 GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
186 GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
187 goto err;
188 }
189 }
190 ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
191 gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
192 if (key_is_ephemeral && sec_key)
193 EVP_PKEY_free(sec_key);
194 if (!key_is_ephemeral) {
195 /* Set control "public key from client certificate used" */
196 if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL)
197 <= 0) {
198 GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT, GOST_R_CTRL_CALL_FAILED);
199 goto err;
200 }
201 }
202 if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL)) > 0)
203 ret = 1;
204 GOST_KEY_TRANSPORT_free(gkt);
205 return ret;
206 err:
207 if (key_is_ephemeral && sec_key)
208 EVP_PKEY_free(sec_key);
209 GOST_KEY_TRANSPORT_free(gkt);
210 return -1;
211}
212
213/*
214 * EVP_PKEY_METHOD callback decrypt
215 * Implementation of GOST2001 key transport, cryptopo variation
227 */
216 */
228int pkey_GOST01cp_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key, size_t * key_len, const unsigned char *in, size_t in_len)
229 {
230 const unsigned char *p = in;
231 EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(pctx);
232 GOST_KEY_TRANSPORT *gkt = NULL;
233 int ret=0;
234 unsigned char wrappedKey[44];
235 unsigned char sharedKey[32];
236 gost_ctx ctx;
237 const struct gost_cipher_info *param=NULL;
238 EVP_PKEY *eph_key=NULL, *peerkey=NULL;
217int pkey_GOST01cp_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key,
218 size_t *key_len, const unsigned char *in,
219 size_t in_len)
220{
221 const unsigned char *p = in;
222 EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(pctx);
223 GOST_KEY_TRANSPORT *gkt = NULL;
224 int ret = 0;
225 unsigned char wrappedKey[44];
226 unsigned char sharedKey[32];
227 gost_ctx ctx;
228 const struct gost_cipher_info *param = NULL;
229 EVP_PKEY *eph_key = NULL, *peerkey = NULL;
239
230
240 if (!key)
241 {
242 *key_len = 32;
243 return 1;
244 }
245 gkt = d2i_GOST_KEY_TRANSPORT(NULL,(const unsigned char **)&p,
246 in_len);
247 if (!gkt)
248 {
249 GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
250 return -1;
251 }
231 if (!key) {
232 *key_len = 32;
233 return 1;
234 }
235 gkt = d2i_GOST_KEY_TRANSPORT(NULL, (const unsigned char **)&p, in_len);
236 if (!gkt) {
237 GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
238 GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
239 return -1;
240 }
252
241
253 /* If key transport structure contains public key, use it */
254 eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
255 if (eph_key)
256 {
257 if (EVP_PKEY_derive_set_peer(pctx, eph_key) <= 0)
258 {
259 GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
260 GOST_R_INCOMPATIBLE_PEER_KEY);
261 goto err;
262 }
263 }
264 else
265 {
266 /* Set control "public key from client certificate used" */
267 if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <= 0)
268 {
269 GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
270 GOST_R_CTRL_CALL_FAILED);
271 goto err;
272 }
273 }
274 peerkey = EVP_PKEY_CTX_get0_peerkey(pctx);
275 if (!peerkey)
276 {
277 GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
278 GOST_R_NO_PEER_KEY);
279 goto err;
280 }
281
282 param = get_encryption_params(gkt->key_agreement_info->cipher);
283 if(!param){
242 /* If key transport structure contains public key, use it */
243 eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
244 if (eph_key) {
245 if (EVP_PKEY_derive_set_peer(pctx, eph_key) <= 0) {
246 GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
247 GOST_R_INCOMPATIBLE_PEER_KEY);
248 goto err;
249 }
250 } else {
251 /* Set control "public key from client certificate used" */
252 if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL)
253 <= 0) {
254 GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT, GOST_R_CTRL_CALL_FAILED);
255 goto err;
256 }
257 }
258 peerkey = EVP_PKEY_CTX_get0_peerkey(pctx);
259 if (!peerkey) {
260 GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT, GOST_R_NO_PEER_KEY);
284 goto err;
285 }
286
261 goto err;
262 }
263
287 gost_init(&ctx,param->sblock);
288 OPENSSL_assert(gkt->key_agreement_info->eph_iv->length==8);
289 memcpy(wrappedKey,gkt->key_agreement_info->eph_iv->data,8);
290 OPENSSL_assert(gkt->key_info->encrypted_key->length==32);
291 memcpy(wrappedKey+8,gkt->key_info->encrypted_key->data,32);
292 OPENSSL_assert(gkt->key_info->imit->length==4);
293 memcpy(wrappedKey+40,gkt->key_info->imit->data,4);
294 VKO_compute_key(sharedKey,32,EC_KEY_get0_public_key(EVP_PKEY_get0(peerkey)),
295 EVP_PKEY_get0(priv),wrappedKey);
296 if (!keyUnwrapCryptoPro(&ctx,sharedKey,wrappedKey,key))
297 {
298 GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
299 GOST_R_ERROR_COMPUTING_SHARED_KEY);
300 goto err;
301 }
302
303 ret=1;
304err:
305 if (eph_key) EVP_PKEY_free(eph_key);
306 if (gkt) GOST_KEY_TRANSPORT_free(gkt);
307 return ret;
308 }
264 param = get_encryption_params(gkt->key_agreement_info->cipher);
265 if (!param) {
266 goto err;
267 }
268
269 gost_init(&ctx, param->sblock);
270 OPENSSL_assert(gkt->key_agreement_info->eph_iv->length == 8);
271 memcpy(wrappedKey, gkt->key_agreement_info->eph_iv->data, 8);
272 OPENSSL_assert(gkt->key_info->encrypted_key->length == 32);
273 memcpy(wrappedKey + 8, gkt->key_info->encrypted_key->data, 32);
274 OPENSSL_assert(gkt->key_info->imit->length == 4);
275 memcpy(wrappedKey + 40, gkt->key_info->imit->data, 4);
276 VKO_compute_key(sharedKey, 32,
277 EC_KEY_get0_public_key(EVP_PKEY_get0(peerkey)),
278 EVP_PKEY_get0(priv), wrappedKey);
279 if (!keyUnwrapCryptoPro(&ctx, sharedKey, wrappedKey, key)) {
280 GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
281 GOST_R_ERROR_COMPUTING_SHARED_KEY);
282 goto err;
283 }
284
285 ret = 1;
286 err:
287 if (eph_key)
288 EVP_PKEY_free(eph_key);
289 if (gkt)
290 GOST_KEY_TRANSPORT_free(gkt);
291 return ret;
292}