3 #include <openssl/evp.h>
4 #include <openssl/hmac.h>
7 #include "e_gost_err.h"
10 * Function expects that out is a preallocated buffer of length
11 * defined as sum of shared_len and mac length defined by mac_nid
13 int gost_kexp15(const unsigned char *shared_key, const int shared_len,
14 int cipher_nid, const unsigned char *cipher_key,
15 int mac_nid, unsigned char *mac_key,
16 const unsigned char *iv, const size_t ivlen,
17 unsigned char *out, int *out_len)
19 unsigned char iv_full[16], mac_buf[16];
22 EVP_CIPHER_CTX *ciph = NULL;
23 EVP_MD_CTX *mac = NULL;
28 mac_len = (cipher_nid == NID_magma_ctr) ? 8 :
29 (cipher_nid == NID_grasshopper_ctr) ? 16 : 0;
32 GOSTerr(GOST_F_GOST_KEXP15, GOST_R_INVALID_CIPHER);
36 /* we expect IV of half length */
37 memset(iv_full, 0, 16);
38 memcpy(iv_full, iv, ivlen);
40 mac = EVP_MD_CTX_new();
42 GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
46 if (EVP_DigestInit_ex(mac, EVP_get_digestbynid(mac_nid), NULL) <= 0
47 || EVP_MD_CTX_ctrl(mac, EVP_MD_CTRL_SET_KEY, 32, mac_key) <= 0
48 || EVP_MD_CTX_ctrl(mac, EVP_MD_CTRL_MAC_LEN, mac_len, NULL) <= 0
49 || EVP_DigestUpdate(mac, iv, ivlen) <= 0
50 || EVP_DigestUpdate(mac, shared_key, shared_len) <= 0
51 /* As we set MAC length directly, we should not allow overwriting it */
52 || EVP_DigestFinal_ex(mac, mac_buf, NULL) <= 0) {
53 GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
57 ciph = EVP_CIPHER_CTX_new();
59 GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
64 (ciph, EVP_get_cipherbynid(cipher_nid), NULL, NULL, NULL, 1) <= 0
65 || EVP_CipherInit_ex(ciph, NULL, NULL, cipher_key, iv_full, 1) <= 0
66 || EVP_CipherUpdate(ciph, out, &len, shared_key, shared_len) <= 0
67 || EVP_CipherUpdate(ciph, out + shared_len, &len, mac_buf, mac_len) <= 0
68 || EVP_CipherFinal_ex(ciph, out + shared_len + len, out_len) <= 0) {
69 GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
73 *out_len = shared_len + mac_len;
78 OPENSSL_cleanse(mac_buf, mac_len);
80 EVP_CIPHER_CTX_free(ciph);
86 * Function expects that shared_key is a preallocated buffer
87 * with length defined as expkeylen + mac_len defined by mac_nid
89 int gost_kimp15(const unsigned char *expkey, const size_t expkeylen,
90 int cipher_nid, const unsigned char *cipher_key,
91 int mac_nid, unsigned char *mac_key,
92 const unsigned char *iv, const size_t ivlen,
93 unsigned char *shared_key)
95 unsigned char iv_full[16], out[48], mac_buf[16];
97 const size_t shared_len = 32;
99 EVP_CIPHER_CTX *ciph = NULL;
100 EVP_MD_CTX *mac = NULL;
105 mac_len = (cipher_nid == NID_magma_ctr) ? 8 :
106 (cipher_nid == NID_grasshopper_ctr) ? 16 : 0;
109 GOSTerr(GOST_F_GOST_KIMP15, GOST_R_INVALID_CIPHER);
113 /* we expect IV of half length */
114 memset(iv_full, 0, 16);
115 memcpy(iv_full, iv, ivlen);
117 ciph = EVP_CIPHER_CTX_new();
119 GOSTerr(GOST_F_GOST_KIMP15, ERR_R_MALLOC_FAILURE);
123 if (EVP_CipherInit_ex
124 (ciph, EVP_get_cipherbynid(cipher_nid), NULL, NULL, NULL, 0) <= 0
125 || EVP_CipherInit_ex(ciph, NULL, NULL, cipher_key, iv_full, 0) <= 0
126 || EVP_CipherUpdate(ciph, out, &len, expkey, expkeylen) <= 0
127 || EVP_CipherFinal_ex(ciph, out + len, &len) <= 0) {
128 GOSTerr(GOST_F_GOST_KIMP15, ERR_R_INTERNAL_ERROR);
131 /*Now we have shared key and mac in out[] */
133 mac = EVP_MD_CTX_new();
135 GOSTerr(GOST_F_GOST_KIMP15, ERR_R_MALLOC_FAILURE);
139 if (EVP_DigestInit_ex(mac, EVP_get_digestbynid(mac_nid), NULL) <= 0
140 || EVP_MD_CTX_ctrl(mac, EVP_MD_CTRL_SET_KEY, 32, mac_key) <= 0
141 || EVP_MD_CTX_ctrl(mac, EVP_MD_CTRL_MAC_LEN, mac_len, NULL) <= 0
142 || EVP_DigestUpdate(mac, iv, ivlen) <= 0
143 || EVP_DigestUpdate(mac, out, shared_len) <= 0
144 /* As we set MAC length directly, we should not allow overwriting it */
145 || EVP_DigestFinal_ex(mac, mac_buf, NULL) <= 0) {
146 GOSTerr(GOST_F_GOST_KIMP15, ERR_R_INTERNAL_ERROR);
150 if (CRYPTO_memcmp(mac_buf, out + shared_len, mac_len) != 0) {
151 GOSTerr(GOST_F_GOST_KIMP15, GOST_R_BAD_MAC);
155 memcpy(shared_key, out, shared_len);
159 OPENSSL_cleanse(out, sizeof(out));
160 EVP_MD_CTX_free(mac);
161 EVP_CIPHER_CTX_free(ciph);
165 int gost_kdftree2012_256(unsigned char *keyout, size_t keyout_len,
166 const unsigned char *key, size_t keylen,
167 const unsigned char *label, size_t label_len,
168 const unsigned char *seed, size_t seed_len,
169 const size_t representation)
172 unsigned char zero = 0;
173 unsigned char *ptr = keyout;
174 HMAC_CTX *ctx = NULL;
175 unsigned char *len_ptr = NULL;
176 uint32_t len_repr = htonl(keyout_len * 8);
177 size_t len_repr_len = 4;
179 ctx = HMAC_CTX_new();
181 GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_MALLOC_FAILURE);
185 if ((keyout_len == 0) || (keyout_len % 32 != 0)) {
186 GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_INTERNAL_ERROR);
189 iters = keyout_len / 32;
191 len_ptr = (unsigned char *)&len_repr;
192 while (*len_ptr == 0) {
197 for (i = 1; i <= iters; i++) {
198 uint32_t iter_net = htonl(i);
199 unsigned char *rep_ptr =
200 ((unsigned char *)&iter_net) + (4 - representation);
202 if (HMAC_Init_ex(ctx, key, keylen,
203 EVP_get_digestbynid(NID_id_GostR3411_2012_256),
205 || HMAC_Update(ctx, rep_ptr, representation) <= 0
206 || HMAC_Update(ctx, label, label_len) <= 0
207 || HMAC_Update(ctx, &zero, 1) <= 0
208 || HMAC_Update(ctx, seed, seed_len) <= 0
209 || HMAC_Update(ctx, len_ptr, len_repr_len) <= 0
210 || HMAC_Final(ctx, ptr, NULL) <= 0) {
211 GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_INTERNAL_ERROR);
225 int gost_tlstree(int cipher_nid, const unsigned char *in, unsigned char *out,
226 const unsigned char *tlsseq)
229 uint64_t gh_c1 = 0xFFFFFFFF00000000, gh_c2 = 0xFFFFFFFFFFF80000,
230 gh_c3 = 0xFFFFFFFFFFFFFFC0;
231 uint64_t mg_c1 = 0xFFFFFFC000000000, mg_c2 = 0xFFFFFFFFFE000000,
232 mg_c3 = 0xFFFFFFFFFFFFF000;
234 uint64_t gh_c1 = 0x00000000FFFFFFFF, gh_c2 = 0x0000F8FFFFFFFFFF,
235 gh_c3 = 0xC0FFFFFFFFFFFFFF;
236 uint64_t mg_c1 = 0x00000000C0FFFFFF, mg_c2 = 0x000000FEFFFFFFFF,
237 mg_c3 = 0x00F0FFFFFFFFFFFF;
240 uint64_t seed1, seed2, seed3;
242 unsigned char ko1[32], ko2[32];
244 switch (cipher_nid) {
250 case NID_grasshopper_cbc:
258 memcpy(&seq, tlsseq, 8);
263 if (gost_kdftree2012_256(ko1, 32, in, 32, (const unsigned char *)"level1", 6,
264 (const unsigned char *)&seed1, 8, 1) <= 0
265 || gost_kdftree2012_256(ko2, 32, ko1, 32, (const unsigned char *)"level2", 6,
266 (const unsigned char *)&seed2, 8, 1) <= 0
267 || gost_kdftree2012_256(out, 32, ko2, 32, (const unsigned char *)"level3", 6,
268 (const unsigned char *)&seed3, 8, 1) <= 0)