Import OpenSSL-1.0.0f.
[dragonfly.git] / crypto / openssl / engines / ccgost / gost94_keyx.c
CommitLineData
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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 * *
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 */
25
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
29 */
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 }
43
44/*
45 * Computes 256 bit Key exchange key as specified in RFC 4357
46 */
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 }
70
71/* EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-94 */
72
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;
79
80 return make_cp_exchange_key(gost_get0_priv_key(mykey), pubk, key);
81 }
82
83/* EVP_PKEY_METHOD callback encrypt for
84 * GOST R 34.10-94 cryptopro modification
85 */
86
87
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);
98
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 }
104
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 }
207
208
209/* EVP_PLEY_METHOD callback decrypt for
210 * GOST R 34.10-94 cryptopro modification
211 */
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 }
262
263 param = get_encryption_params(gkt->key_agreement_info->cipher);
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264 if(!param){
265 goto err;
266 }
267
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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