2 * Copyright (c) 2019 Dmitry Belyavskiy <beldmit@gmail.com>
3 * Copyright (c) 2020 Vitaly Chikunov <vt@altlinux.org>
5 * Contents licensed under the terms of the OpenSSL license
6 * See https://www.openssl.org/source/license.html for details
11 #include <arpa/inet.h>
14 #include <openssl/evp.h>
15 #include <openssl/hmac.h>
16 #include <openssl/buffer.h>
19 #include "e_gost_err.h"
21 int omac_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr);
23 * Function expects that out is a preallocated buffer of length
24 * defined as sum of shared_len and mac length defined by mac_nid
26 int gost_kexp15(const unsigned char *shared_key, const int shared_len,
27 int cipher_nid, const unsigned char *cipher_key,
28 int mac_nid, unsigned char *mac_key,
29 const unsigned char *iv, const size_t ivlen,
30 unsigned char *out, int *out_len)
32 unsigned char iv_full[16], mac_buf[16];
35 EVP_CIPHER_CTX *ciph = NULL;
36 EVP_MD_CTX *mac = NULL;
41 mac_len = (cipher_nid == NID_magma_ctr) ? 8 :
42 (cipher_nid == NID_grasshopper_ctr) ? 16 : 0;
45 GOSTerr(GOST_F_GOST_KEXP15, GOST_R_INVALID_CIPHER);
49 /* we expect IV of half length */
50 memset(iv_full, 0, 16);
51 memcpy(iv_full, iv, ivlen);
53 mac = EVP_MD_CTX_new();
55 GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
59 if (EVP_DigestInit_ex(mac, EVP_get_digestbynid(mac_nid), NULL) <= 0
60 || omac_imit_ctrl(mac, EVP_MD_CTRL_SET_KEY, 32, mac_key) <= 0
61 || omac_imit_ctrl(mac, EVP_MD_CTRL_XOF_LEN, mac_len, NULL) <= 0
62 || EVP_DigestUpdate(mac, iv, ivlen) <= 0
63 || EVP_DigestUpdate(mac, shared_key, shared_len) <= 0
64 /* As we set MAC length directly, we should not allow overwriting it */
65 || EVP_DigestFinalXOF(mac, mac_buf, mac_len) <= 0) {
66 GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
70 ciph = EVP_CIPHER_CTX_new();
72 GOSTerr(GOST_F_GOST_KEXP15, ERR_R_MALLOC_FAILURE);
77 (ciph, EVP_get_cipherbynid(cipher_nid), NULL, NULL, NULL, 1) <= 0
78 || EVP_CipherInit_ex(ciph, NULL, NULL, cipher_key, iv_full, 1) <= 0
79 || EVP_CipherUpdate(ciph, out, &len, shared_key, shared_len) <= 0
80 || EVP_CipherUpdate(ciph, out + shared_len, &len, mac_buf, mac_len) <= 0
81 || EVP_CipherFinal_ex(ciph, out + shared_len + len, out_len) <= 0) {
82 GOSTerr(GOST_F_GOST_KEXP15, ERR_R_INTERNAL_ERROR);
86 *out_len = shared_len + mac_len;
91 OPENSSL_cleanse(mac_buf, mac_len);
93 EVP_CIPHER_CTX_free(ciph);
99 * Function expects that shared_key is a preallocated buffer
100 * with length defined as expkeylen + mac_len defined by mac_nid
102 int gost_kimp15(const unsigned char *expkey, const size_t expkeylen,
103 int cipher_nid, const unsigned char *cipher_key,
104 int mac_nid, unsigned char *mac_key,
105 const unsigned char *iv, const size_t ivlen,
106 unsigned char *shared_key)
108 unsigned char iv_full[16], out[48], mac_buf[16];
109 unsigned int mac_len;
110 const size_t shared_len = 32;
112 EVP_CIPHER_CTX *ciph = NULL;
113 EVP_MD_CTX *mac = NULL;
118 mac_len = (cipher_nid == NID_magma_ctr) ? 8 :
119 (cipher_nid == NID_grasshopper_ctr) ? 16 : 0;
122 GOSTerr(GOST_F_GOST_KIMP15, GOST_R_INVALID_CIPHER);
126 /* we expect IV of half length */
127 memset(iv_full, 0, 16);
128 memcpy(iv_full, iv, ivlen);
130 ciph = EVP_CIPHER_CTX_new();
132 GOSTerr(GOST_F_GOST_KIMP15, ERR_R_MALLOC_FAILURE);
136 if (EVP_CipherInit_ex
137 (ciph, EVP_get_cipherbynid(cipher_nid), NULL, NULL, NULL, 0) <= 0
138 || EVP_CipherInit_ex(ciph, NULL, NULL, cipher_key, iv_full, 0) <= 0
139 || EVP_CipherUpdate(ciph, out, &len, expkey, expkeylen) <= 0
140 || EVP_CipherFinal_ex(ciph, out + len, &len) <= 0) {
141 GOSTerr(GOST_F_GOST_KIMP15, ERR_R_INTERNAL_ERROR);
144 /*Now we have shared key and mac in out[] */
146 mac = EVP_MD_CTX_new();
148 GOSTerr(GOST_F_GOST_KIMP15, ERR_R_MALLOC_FAILURE);
152 if (EVP_DigestInit_ex(mac, EVP_get_digestbynid(mac_nid), NULL) <= 0
153 || omac_imit_ctrl(mac, EVP_MD_CTRL_SET_KEY, 32, mac_key) <= 0
154 || omac_imit_ctrl(mac, EVP_MD_CTRL_XOF_LEN, mac_len, NULL) <= 0
155 || EVP_DigestUpdate(mac, iv, ivlen) <= 0
156 || EVP_DigestUpdate(mac, out, shared_len) <= 0
157 /* As we set MAC length directly, we should not allow overwriting it */
158 || EVP_DigestFinalXOF(mac, mac_buf, mac_len) <= 0) {
159 GOSTerr(GOST_F_GOST_KIMP15, ERR_R_INTERNAL_ERROR);
163 if (CRYPTO_memcmp(mac_buf, out + shared_len, mac_len) != 0) {
164 GOSTerr(GOST_F_GOST_KIMP15, GOST_R_BAD_MAC);
168 memcpy(shared_key, out, shared_len);
172 OPENSSL_cleanse(out, sizeof(out));
173 EVP_MD_CTX_free(mac);
174 EVP_CIPHER_CTX_free(ciph);
178 int gost_kdftree2012_256(unsigned char *keyout, size_t keyout_len,
179 const unsigned char *key, size_t keylen,
180 const unsigned char *label, size_t label_len,
181 const unsigned char *seed, size_t seed_len,
182 const size_t representation)
185 unsigned char zero = 0;
186 unsigned char *ptr = keyout;
188 unsigned char *len_ptr = NULL;
189 uint32_t len_repr = htonl(keyout_len * 8);
190 size_t len_repr_len = 4;
192 ctx = HMAC_CTX_new();
194 GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_MALLOC_FAILURE);
198 if ((keyout_len == 0) || (keyout_len % 32 != 0)) {
199 GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_INTERNAL_ERROR);
202 iters = keyout_len / 32;
204 len_ptr = (unsigned char *)&len_repr;
205 while (*len_ptr == 0) {
210 for (i = 1; i <= iters; i++) {
211 uint32_t iter_net = htonl(i);
212 unsigned char *rep_ptr =
213 ((unsigned char *)&iter_net) + (4 - representation);
215 if (HMAC_Init_ex(ctx, key, keylen,
216 EVP_get_digestbynid(NID_id_GostR3411_2012_256),
218 || HMAC_Update(ctx, rep_ptr, representation) <= 0
219 || HMAC_Update(ctx, label, label_len) <= 0
220 || HMAC_Update(ctx, &zero, 1) <= 0
221 || HMAC_Update(ctx, seed, seed_len) <= 0
222 || HMAC_Update(ctx, len_ptr, len_repr_len) <= 0
223 || HMAC_Final(ctx, ptr, NULL) <= 0) {
224 GOSTerr(GOST_F_GOST_KDFTREE2012_256, ERR_R_INTERNAL_ERROR);
238 int gost_tlstree(int cipher_nid, const unsigned char *in, unsigned char *out,
239 const unsigned char *tlsseq)
241 uint64_t gh_c1 = 0x00000000FFFFFFFF, gh_c2 = 0x0000F8FFFFFFFFFF,
242 gh_c3 = 0xC0FFFFFFFFFFFFFF;
243 uint64_t mg_c1 = 0x00000000C0FFFFFF, mg_c2 = 0x000000FEFFFFFFFF,
244 mg_c3 = 0x00F0FFFFFFFFFFFF;
246 uint64_t seed1, seed2, seed3;
248 unsigned char ko1[32], ko2[32];
250 switch (cipher_nid) {
256 case NID_grasshopper_cbc:
265 BUF_reverse((unsigned char *)&seq, tlsseq, 8);
267 memcpy(&seq, tlsseq, 8);
273 if (gost_kdftree2012_256(ko1, 32, in, 32, (const unsigned char *)"level1", 6,
274 (const unsigned char *)&seed1, 8, 1) <= 0
275 || gost_kdftree2012_256(ko2, 32, ko1, 32, (const unsigned char *)"level2", 6,
276 (const unsigned char *)&seed2, 8, 1) <= 0
277 || gost_kdftree2012_256(out, 32, ko2, 32, (const unsigned char *)"level3", 6,
278 (const unsigned char *)&seed3, 8, 1) <= 0)
284 #define GOST_WRAP_FLAGS EVP_CIPH_CTRL_INIT | EVP_CIPH_WRAP_MODE | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER | EVP_CIPH_FLAG_DEFAULT_ASN1
286 #define MAGMA_MAC_WRAP_LEN 8
287 #define KUZNYECHIK_MAC_WRAP_LEN 16
288 #define MAX_MAC_WRAP_LEN KUZNYECHIK_MAC_WRAP_LEN
289 #define GOSTKEYLEN 32
290 #define MAGMA_WRAPPED_KEY_LEN GOSTKEYLEN + MAGMA_MAC_WRAP_LEN
291 #define KUZNYECHIK_WRAPPED_KEY_LEN GOSTKEYLEN + KUZNYECHIK_MAC_WRAP_LEN
292 #define MAX_WRAPPED_KEY_LEN KUZNYECHIK_WRAPPED_KEY_LEN
295 unsigned char iv[8]; /* Max IV size is half of base cipher block length */
296 unsigned char key[GOSTKEYLEN*2]; /* Combined cipher and mac keys */
297 unsigned char wrapped[MAX_WRAPPED_KEY_LEN]; /* Max size */
301 static int magma_wrap_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
302 const unsigned char *iv, int enc)
304 GOST_WRAP_CTX *cctx = EVP_CIPHER_CTX_get_cipher_data(ctx);
305 memset(cctx->wrapped, 0, MAX_WRAPPED_KEY_LEN);
306 cctx->wrap_count = 0;
309 memset(cctx->iv, 0, 8);
310 memcpy(cctx->iv, iv, 4);
314 memcpy(cctx->key, key, GOSTKEYLEN*2);
319 static int magma_wrap_do(EVP_CIPHER_CTX *ctx, unsigned char *out,
320 const unsigned char *in, size_t inl)
322 GOST_WRAP_CTX *cctx = EVP_CIPHER_CTX_get_cipher_data(ctx);
323 int enc = EVP_CIPHER_CTX_encrypting(ctx) ? 1 : 0;
328 if (inl <= MAGMA_WRAPPED_KEY_LEN) {
329 if (cctx->wrap_count + inl > MAGMA_WRAPPED_KEY_LEN)
332 if (cctx->wrap_count + inl <= MAGMA_WRAPPED_KEY_LEN)
334 memcpy(cctx->wrapped+cctx->wrap_count, in, inl);
335 cctx->wrap_count += inl;
339 if (cctx->wrap_count < MAGMA_WRAPPED_KEY_LEN)
344 return gost_kexp15(cctx->key, 32, NID_magma_ctr, in, NID_magma_mac,
345 cctx->key, /* FIXME mac_key, */ cctx->iv, 4, out, &outl);
349 return gost_kimp15(cctx->wrapped, cctx->wrap_count, NID_magma_ctr,
350 cctx->key+GOSTKEYLEN, NID_magma_mac, cctx->key, cctx->iv, 4, out) > 0 ? GOSTKEYLEN : 0;
355 static int kuznyechik_wrap_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
356 const unsigned char *iv, int enc)
358 GOST_WRAP_CTX *cctx = EVP_CIPHER_CTX_get_cipher_data(ctx);
359 memset(cctx->wrapped, 0, KUZNYECHIK_WRAPPED_KEY_LEN);
360 cctx->wrap_count = 0;
363 memset(cctx->iv, 0, 8);
364 memcpy(cctx->iv, iv, 8);
368 memcpy(cctx->key, key, GOSTKEYLEN*2);
373 static int kuznyechik_wrap_do(EVP_CIPHER_CTX *ctx, unsigned char *out,
374 const unsigned char *in, size_t inl)
376 GOST_WRAP_CTX *cctx = EVP_CIPHER_CTX_get_cipher_data(ctx);
377 int enc = EVP_CIPHER_CTX_encrypting(ctx) ? 1 : 0;
382 if (inl <= KUZNYECHIK_WRAPPED_KEY_LEN) {
383 if (cctx->wrap_count + inl > KUZNYECHIK_WRAPPED_KEY_LEN)
386 if (cctx->wrap_count + inl <= KUZNYECHIK_WRAPPED_KEY_LEN)
388 memcpy(cctx->wrapped+cctx->wrap_count, in, inl);
389 cctx->wrap_count += inl;
393 if (cctx->wrap_count < KUZNYECHIK_WRAPPED_KEY_LEN)
398 return gost_kexp15(cctx->key, 32, NID_magma_ctr, in, NID_magma_mac,
399 cctx->key, /* FIXME mac_key, */ cctx->iv, 4, out, &outl);
403 return gost_kimp15(cctx->wrapped, cctx->wrap_count, NID_kuznyechik_ctr,
404 cctx->key+GOSTKEYLEN, NID_kuznyechik_mac, cctx->key, cctx->iv, 8, out) > 0 ? GOSTKEYLEN : 0;
408 static int wrap_ctrl (EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
413 EVP_CIPHER_CTX_set_flags(ctx, EVP_CIPHER_CTX_FLAG_WRAP_ALLOW);
420 static GOST_cipher wrap_template_cipher = {
421 .key_len = GOSTKEYLEN * 2,
422 .flags = GOST_WRAP_FLAGS,
423 .ctx_size = sizeof(GOST_WRAP_CTX),
427 GOST_cipher magma_kexp15_cipher = {
428 .template = &wrap_template_cipher,
429 .nid = NID_magma_kexp15,
432 .init = magma_wrap_init,
433 .do_cipher = magma_wrap_do,
436 GOST_cipher kuznyechik_kexp15_cipher = {
437 .template = &wrap_template_cipher,
438 .nid = NID_kuznyechik_kexp15,
441 .init = kuznyechik_wrap_init,
442 .do_cipher = kuznyechik_wrap_do,
444 /* vim: set expandtab cinoptions=\:0,l1,t0,g0,(0 sw=4 : */