1/**********************************************************************
2 * gost94_keyx.c *
3 * Copyright (c) 2005-2006 Cryptocom LTD *
4 * This file is distributed under the same license as OpenSSL *
5 * *
6 * Implements generation and parsing of GOST_KEY_TRANSPORT for *
| 1/**********************************************************************
2 * gost94_keyx.c *
3 * Copyright (c) 2005-2006 Cryptocom LTD *
4 * This file is distributed under the same license as OpenSSL *
5 * *
6 * Implements generation and parsing of GOST_KEY_TRANSPORT for *
|
7 * GOST R 34.10-94 algorithms *
8 * *
| 7 * GOST R 34.10-94 algorithms *
8 * *
|
9 * Requires OpenSSL 0.9.9 for compilation *
10 **********************************************************************/
11#include <string.h>
12#include <openssl/dh.h>
13#include <openssl/rand.h>
14#include <openssl/evp.h>
15#include <openssl/objects.h>
16
17#include "gost89.h"
18#include "gosthash.h"
19#include "e_gost_err.h"
20#include "gost_keywrap.h"
21#include "gost_lcl.h"
22/* Common functions for both 94 and 2001 key exchange schemes */
| 9 * Requires OpenSSL 0.9.9 for compilation *
10 **********************************************************************/
11#include <string.h>
12#include <openssl/dh.h>
13#include <openssl/rand.h>
14#include <openssl/evp.h>
15#include <openssl/objects.h>
16
17#include "gost89.h"
18#include "gosthash.h"
19#include "e_gost_err.h"
20#include "gost_keywrap.h"
21#include "gost_lcl.h"
22/* Common functions for both 94 and 2001 key exchange schemes */
|
23/* Implementation of the Diffi-Hellman key agreement scheme based on
24 * GOST-94 keys */
| 23/*
24 * Implementation of the Diffi-Hellman key agreement scheme based on GOST-94
25 * keys
26 */
|
25
| 27
|
26/* Computes Diffie-Hellman key and stores it into buffer in
27 * little-endian byte order as expected by both versions of GOST 94
28 * algorithm
| 28/*
29 * Computes Diffie-Hellman key and stores it into buffer in little-endian
30 * byte order as expected by both versions of GOST 94 algorithm
|
29 */
| 31 */
|
30static int compute_pair_key_le(unsigned char *pair_key,BIGNUM *pub_key,DH *dh)
31 {
32 unsigned char be_key[128];
33 int i,key_size;
34 key_size=DH_compute_key(be_key,pub_key,dh);
35 if (!key_size) return 0;
36 memset(pair_key,0,128);
37 for (i=0;i<key_size;i++)
38 {
39 pair_key[i]=be_key[key_size-1-i];
40 }
41 return key_size;
42 }
| 32static int compute_pair_key_le(unsigned char *pair_key, BIGNUM *pub_key,
33 DH *dh)
34{
35 unsigned char be_key[128];
36 int i, key_size;
37 key_size = DH_compute_key(be_key, pub_key, dh);
38 if (!key_size)
39 return 0;
40 memset(pair_key, 0, 128);
41 for (i = 0; i < key_size; i++) {
42 pair_key[i] = be_key[key_size - 1 - i];
43 }
44 return key_size;
45}
|
43
44/*
| 46
47/*
|
45 * Computes 256 bit Key exchange key as specified in RFC 4357
| 48 * Computes 256 bit Key exchange key as specified in RFC 4357
|
46 */
| 49 */
|
47static int make_cp_exchange_key(BIGNUM *priv_key,EVP_PKEY *pubk, unsigned char *shared_key)
48 {
49 unsigned char dh_key [128];
50 int ret;
51 gost_hash_ctx hash_ctx;
52 DH *dh = DH_new();
53
54 if (!dh)
55 return 0;
56 memset(dh_key,0,128);
57 dh->g = BN_dup(pubk->pkey.dsa->g);
58 dh->p = BN_dup(pubk->pkey.dsa->p);
59 dh->priv_key = BN_dup(priv_key);
60 ret=compute_pair_key_le(dh_key,((DSA *)(EVP_PKEY_get0(pubk)))->pub_key,dh) ;
61 DH_free(dh);
62 if (!ret) return 0;
63 init_gost_hash_ctx(&hash_ctx,&GostR3411_94_CryptoProParamSet);
64 start_hash(&hash_ctx);
65 hash_block(&hash_ctx,dh_key,128);
66 finish_hash(&hash_ctx,shared_key);
67 done_gost_hash_ctx(&hash_ctx);
68 return 1;
69 }
| 50static int make_cp_exchange_key(BIGNUM *priv_key, EVP_PKEY *pubk,
51 unsigned char *shared_key)
52{
53 unsigned char dh_key[128];
54 int ret;
55 gost_hash_ctx hash_ctx;
56 DH *dh = DH_new();
|
70
| 57
|
| 58 if (!dh)
59 return 0;
60 memset(dh_key, 0, 128);
61 dh->g = BN_dup(pubk->pkey.dsa->g);
62 dh->p = BN_dup(pubk->pkey.dsa->p);
63 dh->priv_key = BN_dup(priv_key);
64 ret =
65 compute_pair_key_le(dh_key, ((DSA *)(EVP_PKEY_get0(pubk)))->pub_key,
66 dh);
67 DH_free(dh);
68 if (!ret)
69 return 0;
70 init_gost_hash_ctx(&hash_ctx, &GostR3411_94_CryptoProParamSet);
71 start_hash(&hash_ctx);
72 hash_block(&hash_ctx, dh_key, 128);
73 finish_hash(&hash_ctx, shared_key);
74 done_gost_hash_ctx(&hash_ctx);
75 return 1;
76}
77
|
71/* EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-94 */
72
| 78/* EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-94 */
79
|
73int pkey_gost94_derive(EVP_PKEY_CTX *ctx,unsigned char *key,size_t *keylen)
74 {
75 EVP_PKEY *pubk = EVP_PKEY_CTX_get0_peerkey(ctx);
76 EVP_PKEY *mykey = EVP_PKEY_CTX_get0_pkey(ctx);
77 *keylen = 32;
78 if (key == NULL) return 1;
| 80int pkey_gost94_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
81{
82 EVP_PKEY *pubk = EVP_PKEY_CTX_get0_peerkey(ctx);
83 EVP_PKEY *mykey = EVP_PKEY_CTX_get0_pkey(ctx);
84 *keylen = 32;
85 if (key == NULL)
86 return 1;
|
79
| 87
|
80 return make_cp_exchange_key(gost_get0_priv_key(mykey), pubk, key);
81 }
| 88 return make_cp_exchange_key(gost_get0_priv_key(mykey), pubk, key);
89}
|
82
| 90
|
83/* EVP_PKEY_METHOD callback encrypt for
84 * GOST R 34.10-94 cryptopro modification
| 91/*
92 * EVP_PKEY_METHOD callback encrypt for GOST R 34.10-94 cryptopro
93 * modification
|
85 */
86
| 94 */
95
|
| 96int pkey_GOST94cp_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out,
97 size_t *outlen, const unsigned char *key,
98 size_t key_len)
99{
100 GOST_KEY_TRANSPORT *gkt = NULL;
101 unsigned char shared_key[32], ukm[8], crypted_key[44];
102 const struct gost_cipher_info *param = get_encryption_params(NULL);
103 EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(ctx);
104 struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
105 gost_ctx cctx;
106 int key_is_ephemeral = 1;
107 EVP_PKEY *mykey = EVP_PKEY_CTX_get0_peerkey(ctx);
|
87
| 108
|
88int pkey_GOST94cp_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen, const unsigned char* key, size_t key_len )
89 {
90 GOST_KEY_TRANSPORT *gkt=NULL;
91 unsigned char shared_key[32], ukm[8],crypted_key[44];
92 const struct gost_cipher_info *param=get_encryption_params(NULL);
93 EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(ctx);
94 struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
95 gost_ctx cctx;
96 int key_is_ephemeral=1;
97 EVP_PKEY *mykey = EVP_PKEY_CTX_get0_peerkey(ctx);
| 109 /* Do not use vizir cipher parameters with cryptopro */
110 if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS)
111 && param == gost_cipher_list) {
112 param = gost_cipher_list + 1;
113 }
|
98
| 114
|
99 /* Do not use vizir cipher parameters with cryptopro */
100 if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS) && param == gost_cipher_list)
101 {
102 param= gost_cipher_list+1;
103 }
| 115 if (mykey) {
116 /* If key already set, it is not ephemeral */
117 key_is_ephemeral = 0;
118 if (!gost_get0_priv_key(mykey)) {
119 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
120 GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
121 goto err;
122 }
123 } else {
124 /* Otherwise generate ephemeral key */
125 key_is_ephemeral = 1;
126 if (out) {
127 mykey = EVP_PKEY_new();
128 EVP_PKEY_assign(mykey, EVP_PKEY_base_id(pubk), DSA_new());
129 EVP_PKEY_copy_parameters(mykey, pubk);
130 if (!gost_sign_keygen(EVP_PKEY_get0(mykey))) {
131 goto err;
132 }
133 }
134 }
135 if (out)
136 make_cp_exchange_key(gost_get0_priv_key(mykey), pubk, shared_key);
137 if (data->shared_ukm) {
138 memcpy(ukm, data->shared_ukm, 8);
139 } else if (out) {
140 if (RAND_bytes(ukm, 8) <= 0) {
141 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
142 GOST_R_RANDOM_GENERATOR_FAILURE);
143 goto err;
144 }
145 }
|
104
| 146
|
105 if (mykey)
106 {
107 /* If key already set, it is not ephemeral */
108 key_is_ephemeral=0;
109 if (!gost_get0_priv_key(mykey))
110 {
111 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
112 GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
113 goto err;
114 }
115 }
116 else
117 {
118 /* Otherwise generate ephemeral key */
119 key_is_ephemeral = 1;
120 if (out)
121 {
122 mykey = EVP_PKEY_new();
123 EVP_PKEY_assign(mykey, EVP_PKEY_base_id(pubk),DSA_new());
124 EVP_PKEY_copy_parameters(mykey,pubk);
125 if (!gost_sign_keygen(EVP_PKEY_get0(mykey)))
126 {
127 goto err;
128 }
129 }
130 }
131 if (out)
132 make_cp_exchange_key(gost_get0_priv_key(mykey),pubk,shared_key);
133 if (data->shared_ukm)
134 {
135 memcpy(ukm,data->shared_ukm,8);
136 }
137 else if (out)
138 {
139 if (RAND_bytes(ukm,8)<=0)
140 {
141 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
142 GOST_R_RANDOM_GENERATOR_FAILURE);
143 goto err;
144 }
145 }
146
147 if (out) {
148 gost_init(&cctx,param->sblock);
149 keyWrapCryptoPro(&cctx,shared_key,ukm,key,crypted_key);
150 }
151 gkt = GOST_KEY_TRANSPORT_new();
152 if (!gkt)
153 {
154 goto memerr;
155 }
156 if(!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv,
157 ukm,8))
158 {
159 goto memerr;
160 }
161 if (!ASN1_OCTET_STRING_set(gkt->key_info->imit,crypted_key+40,4))
162 {
163 goto memerr;
164 }
165 if (!ASN1_OCTET_STRING_set(gkt->key_info->encrypted_key,crypted_key+8,32))
166 {
167 goto memerr;
168 }
169 if (key_is_ephemeral) {
170 if (!X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,out?mykey:pubk))
171 {
172 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
173 goto err;
174 }
175 if (out) EVP_PKEY_free(mykey);
176 }
177 ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
178 gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
179 *outlen = i2d_GOST_KEY_TRANSPORT(gkt,out?&out:NULL);
180 if (*outlen <= 0)
181 {
182 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,GOST_R_ERROR_PACKING_KEY_TRANSPORT_INFO);
183 goto err;
184 }
185 if (!key_is_ephemeral)
186 {
187 /* Set control "public key from client certificate used" */
188 if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <= 0)
189 {
190 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
191 GOST_R_CTRL_CALL_FAILED);
192 goto err;
193 }
194 }
195 GOST_KEY_TRANSPORT_free(gkt);
196 return 1;
197 memerr:
198 if (key_is_ephemeral) {
199 EVP_PKEY_free(mykey);
200 }
201 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
202 GOST_R_MALLOC_FAILURE);
203 err:
204 GOST_KEY_TRANSPORT_free(gkt);
205 return -1;
206 }
| 147 if (out) {
148 gost_init(&cctx, param->sblock);
149 keyWrapCryptoPro(&cctx, shared_key, ukm, key, crypted_key);
150 }
151 gkt = GOST_KEY_TRANSPORT_new();
152 if (!gkt) {
153 goto memerr;
154 }
155 if (!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv, ukm, 8)) {
156 goto memerr;
157 }
158 if (!ASN1_OCTET_STRING_set(gkt->key_info->imit, crypted_key + 40, 4)) {
159 goto memerr;
160 }
161 if (!ASN1_OCTET_STRING_set
162 (gkt->key_info->encrypted_key, crypted_key + 8, 32)) {
163 goto memerr;
164 }
165 if (key_is_ephemeral) {
166 if (!X509_PUBKEY_set
167 (&gkt->key_agreement_info->ephem_key, out ? mykey : pubk)) {
168 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
169 GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
170 goto err;
171 }
172 if (out)
173 EVP_PKEY_free(mykey);
174 }
175 ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
176 gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
177 *outlen = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL);
178 if (*outlen <= 0) {
179 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
180 GOST_R_ERROR_PACKING_KEY_TRANSPORT_INFO);
181 goto err;
182 }
183 if (!key_is_ephemeral) {
184 /* Set control "public key from client certificate used" */
185 if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <=
186 0) {
187 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT, GOST_R_CTRL_CALL_FAILED);
188 goto err;
189 }
190 }
191 GOST_KEY_TRANSPORT_free(gkt);
192 return 1;
193 memerr:
194 if (key_is_ephemeral) {
195 EVP_PKEY_free(mykey);
196 }
197 GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT, GOST_R_MALLOC_FAILURE);
198 err:
199 GOST_KEY_TRANSPORT_free(gkt);
200 return -1;
201}
|
207
| 202
|
208
209/* EVP_PLEY_METHOD callback decrypt for
210 * GOST R 34.10-94 cryptopro modification
| 203/*
204 * EVP_PLEY_METHOD callback decrypt for GOST R 34.10-94 cryptopro
205 * modification
|
211 */
| 206 */
|
212int pkey_GOST94cp_decrypt(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *key_len,const unsigned char *in, size_t in_len) {
213 const unsigned char *p = in;
214 GOST_KEY_TRANSPORT *gkt = NULL;
215 unsigned char wrappedKey[44];
216 unsigned char sharedKey[32];
217 gost_ctx cctx;
218 const struct gost_cipher_info *param=NULL;
219 EVP_PKEY *eph_key=NULL, *peerkey=NULL;
220 EVP_PKEY *priv= EVP_PKEY_CTX_get0_pkey(ctx);
221
222 if (!key)
223 {
224 *key_len = 32;
225 return 1;
226 }
227
228 gkt = d2i_GOST_KEY_TRANSPORT(NULL,(const unsigned char **)&p,
229 in_len);
230 if (!gkt)
231 {
232 GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
233 return 0;
234 }
235 eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
236 if (eph_key)
237 {
238 if (EVP_PKEY_derive_set_peer(ctx, eph_key) <= 0)
239 {
240 GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
241 GOST_R_INCOMPATIBLE_PEER_KEY);
242 goto err;
243 }
244 }
245 else
246 {
247 /* Set control "public key from client certificate used" */
248 if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <= 0)
249 {
250 GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
251 GOST_R_CTRL_CALL_FAILED);
252 goto err;
253 }
254 }
255 peerkey = EVP_PKEY_CTX_get0_peerkey(ctx);
256 if (!peerkey)
257 {
258 GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
259 GOST_R_NO_PEER_KEY);
260 goto err;
261 }
| 207int pkey_GOST94cp_decrypt(EVP_PKEY_CTX *ctx, unsigned char *key,
208 size_t *key_len, const unsigned char *in,
209 size_t in_len)
210{
211 const unsigned char *p = in;
212 GOST_KEY_TRANSPORT *gkt = NULL;
213 unsigned char wrappedKey[44];
214 unsigned char sharedKey[32];
215 gost_ctx cctx;
216 const struct gost_cipher_info *param = NULL;
217 EVP_PKEY *eph_key = NULL, *peerkey = NULL;
218 EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(ctx);
|
262
| 219
|
263 param = get_encryption_params(gkt->key_agreement_info->cipher);
264 if(!param){
| 220 if (!key) {
221 *key_len = 32;
222 return 1;
223 }
224
225 gkt = d2i_GOST_KEY_TRANSPORT(NULL, (const unsigned char **)&p, in_len);
226 if (!gkt) {
227 GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
228 GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
229 return 0;
230 }
231 eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
232 if (eph_key) {
233 if (EVP_PKEY_derive_set_peer(ctx, eph_key) <= 0) {
234 GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
235 GOST_R_INCOMPATIBLE_PEER_KEY);
236 goto err;
237 }
238 } else {
239 /* Set control "public key from client certificate used" */
240 if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <=
241 0) {
242 GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT, GOST_R_CTRL_CALL_FAILED);
243 goto err;
244 }
245 }
246 peerkey = EVP_PKEY_CTX_get0_peerkey(ctx);
247 if (!peerkey) {
248 GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT, GOST_R_NO_PEER_KEY);
|
265 goto err;
266 }
| 249 goto err;
250 }
|
267
268 gost_init(&cctx,param->sblock);
269 OPENSSL_assert(gkt->key_agreement_info->eph_iv->length==8);
270 memcpy(wrappedKey,gkt->key_agreement_info->eph_iv->data,8);
271 OPENSSL_assert(gkt->key_info->encrypted_key->length==32);
272 memcpy(wrappedKey+8,gkt->key_info->encrypted_key->data,32);
273 OPENSSL_assert(gkt->key_info->imit->length==4);
274 memcpy(wrappedKey+40,gkt->key_info->imit->data,4);
275 make_cp_exchange_key(gost_get0_priv_key(priv),peerkey,sharedKey);
276 if (!keyUnwrapCryptoPro(&cctx,sharedKey,wrappedKey,key))
277 {
278 GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
279 GOST_R_ERROR_COMPUTING_SHARED_KEY);
280 goto err;
281 }
282
283 EVP_PKEY_free(eph_key);
284 GOST_KEY_TRANSPORT_free(gkt);
285 return 1;
286err:
287 EVP_PKEY_free(eph_key);
288 GOST_KEY_TRANSPORT_free(gkt);
289 return -1;
290 }
| |
291
| 251
|
| 252 param = get_encryption_params(gkt->key_agreement_info->cipher);
253 if (!param) {
254 goto err;
255 }
256
257 gost_init(&cctx, param->sblock);
258 OPENSSL_assert(gkt->key_agreement_info->eph_iv->length == 8);
259 memcpy(wrappedKey, gkt->key_agreement_info->eph_iv->data, 8);
260 OPENSSL_assert(gkt->key_info->encrypted_key->length == 32);
261 memcpy(wrappedKey + 8, gkt->key_info->encrypted_key->data, 32);
262 OPENSSL_assert(gkt->key_info->imit->length == 4);
263 memcpy(wrappedKey + 40, gkt->key_info->imit->data, 4);
264 make_cp_exchange_key(gost_get0_priv_key(priv), peerkey, sharedKey);
265 if (!keyUnwrapCryptoPro(&cctx, sharedKey, wrappedKey, key)) {
266 GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
267 GOST_R_ERROR_COMPUTING_SHARED_KEY);
268 goto err;
269 }
270
271 EVP_PKEY_free(eph_key);
272 GOST_KEY_TRANSPORT_free(gkt);
273 return 1;
274 err:
275 EVP_PKEY_free(eph_key);
276 GOST_KEY_TRANSPORT_free(gkt);
277 return -1;
278}
|
| |