gost_grasshopper_cipher.c

   1 /*
   2  * Maxim Tishkov 2016
   3  * This file is distributed under the same license as OpenSSL
   4  */
   5
   6 #include "gost_grasshopper_cipher.h"
   7 #include "gost_grasshopper_defines.h"
   8 #include "gost_grasshopper_math.h"
   9 #include "gost_grasshopper_core.h"
  10 #include "gost_gost2015.h"
  11
  12 #include <openssl/evp.h>
  13 #include <openssl/rand.h>
  14 #include <openssl/err.h>
  15 #include <string.h>
  16
  17 #include "gost_lcl.h"
  18 #include "e_gost_err.h"
  19
  20 enum GRASSHOPPER_CIPHER_TYPE {
  21     GRASSHOPPER_CIPHER_ECB = 0,
  22     GRASSHOPPER_CIPHER_CBC,
  23     GRASSHOPPER_CIPHER_OFB,
  24     GRASSHOPPER_CIPHER_CFB,
  25     GRASSHOPPER_CIPHER_CTR,
  26     GRASSHOPPER_CIPHER_CTRACPKM,
  27     GRASSHOPPER_CIPHER_CTRACPKMOMAC,
  28 };
  29
  30 static EVP_CIPHER *gost_grasshopper_ciphers[7] = {
  31     NULL, NULL, NULL, NULL, NULL, NULL, NULL
  32 };
  33
  34 static GRASSHOPPER_INLINE void
  35 gost_grasshopper_cipher_destroy_ctr(gost_grasshopper_cipher_ctx * c);
  36
  37 struct GRASSHOPPER_CIPHER_PARAMS {
  38     int nid;
  39     grasshopper_init_cipher_func init_cipher;
  40     grasshopper_do_cipher_func do_cipher;
  41     grasshopper_destroy_cipher_func destroy_cipher;
  42     int block_size;
  43     int ctx_size;
  44     int iv_size;
  45     bool padding;
  46     int extra_flags;
  47 };
  48
  49 static struct GRASSHOPPER_CIPHER_PARAMS gost_cipher_params[7] = {
  50         {
  51                 NID_grasshopper_ecb,
  52                 gost_grasshopper_cipher_init_ecb,
  53                 gost_grasshopper_cipher_do_ecb,
  54                 NULL,
  55                 16,
  56                 sizeof(gost_grasshopper_cipher_ctx),
  57                 0,
  58                 true,
  59                 0
  60         },
  61         {
  62                 NID_grasshopper_cbc,
  63                 gost_grasshopper_cipher_init_cbc,
  64                 gost_grasshopper_cipher_do_cbc,
  65                 NULL,
  66                 16,
  67                 sizeof(gost_grasshopper_cipher_ctx),
  68                 16,
  69                 true,
  70                 0
  71         },
  72         {
  73                 NID_grasshopper_ofb,
  74                 gost_grasshopper_cipher_init_ofb,
  75                 gost_grasshopper_cipher_do_ofb,
  76                 NULL,
  77                 1,
  78                 sizeof(gost_grasshopper_cipher_ctx),
  79                 16,
  80                 false,
  81                 0
  82         },
  83         {
  84                 NID_grasshopper_cfb,
  85                 gost_grasshopper_cipher_init_cfb,
  86                 gost_grasshopper_cipher_do_cfb,
  87                 NULL,
  88                 1,
  89                 sizeof(gost_grasshopper_cipher_ctx),
  90                 16,
  91                 false,
  92                 0
  93         },
  94         {
  95                 NID_grasshopper_ctr,
  96                 gost_grasshopper_cipher_init_ctr,
  97                 gost_grasshopper_cipher_do_ctr,
  98                 gost_grasshopper_cipher_destroy_ctr,
  99                 1,
 100                 sizeof(gost_grasshopper_cipher_ctx_ctr),
 101                 8,
 102                 false,
 103                 0
 104         },
 105         {
 106                 NID_kuznyechik_ctr_acpkm,
 107                 gost_grasshopper_cipher_init_ctracpkm,
 108                 gost_grasshopper_cipher_do_ctracpkm,
 109                 gost_grasshopper_cipher_destroy_ctr,
 110                 1,
 111                 sizeof(gost_grasshopper_cipher_ctx_ctr),
 112                 8,
 113                 false,
 114                 0
 115         },
 116         {
 117                 NID_kuznyechik_ctr_acpkm_omac,
 118                 gost_grasshopper_cipher_init_ctracpkm_omac,
 119                 gost_grasshopper_cipher_do_ctracpkm_omac,
 120                 gost_grasshopper_cipher_destroy_ctr,
 121                 1,
 122                 sizeof(gost_grasshopper_cipher_ctx_ctr),
 123                 8,
 124                 false,
 125                 EVP_CIPH_FLAG_CUSTOM_CIPHER|EVP_CIPH_FLAG_CIPHER_WITH_MAC|EVP_CIPH_CUSTOM_COPY
 126         },
 127 };
 128
 129 /* first 256 bit of D from draft-irtf-cfrg-re-keying-12 */
 130 static const unsigned char ACPKM_D_2018[] = {
 131     0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /*  64 bit */
 132     0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 128 bit */
 133     0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
 134     0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 256 bit */
 135 };
 136
 137 static void acpkm_next(gost_grasshopper_cipher_ctx * c)
 138 {
 139     unsigned char newkey[GRASSHOPPER_KEY_SIZE];
 140     const int J = GRASSHOPPER_KEY_SIZE / GRASSHOPPER_BLOCK_SIZE;
 141     int n;
 142
 143     for (n = 0; n < J; n++) {
 144         const unsigned char *D_n = &ACPKM_D_2018[n * GRASSHOPPER_BLOCK_SIZE];
 145
 146         grasshopper_encrypt_block(&c->encrypt_round_keys,
 147                                   (grasshopper_w128_t *) D_n,
 148                                   (grasshopper_w128_t *) & newkey[n *
 149                                                                   GRASSHOPPER_BLOCK_SIZE],
 150                                   &c->buffer);
 151     }
 152     gost_grasshopper_cipher_key(c, newkey);
 153 }
 154
 155 /* Set 256 bit  key into context */
 156 GRASSHOPPER_INLINE void
 157 gost_grasshopper_cipher_key(gost_grasshopper_cipher_ctx * c, const uint8_t *k)
 158 {
 159     int i;
 160     for (i = 0; i < 2; i++) {
 161         grasshopper_copy128(&c->key.k.k[i],
 162                             (const grasshopper_w128_t *)(k + i * 16));
 163     }
 164
 165     grasshopper_set_encrypt_key(&c->encrypt_round_keys, &c->key);
 166     grasshopper_set_decrypt_key(&c->decrypt_round_keys, &c->key);
 167 }
 168
 169 /* Set master 256-bit key to be used in TLSTREE calculation into context */
 170 GRASSHOPPER_INLINE void
 171 gost_grasshopper_master_key(gost_grasshopper_cipher_ctx * c, const uint8_t *k)
 172 {
 173     int i;
 174     for (i = 0; i < 2; i++) {
 175         grasshopper_copy128(&c->master_key.k.k[i],
 176                             (const grasshopper_w128_t *)(k + i * 16));
 177     }
 178 }
 179
 180 /* Cleans up key from context */
 181 GRASSHOPPER_INLINE void
 182 gost_grasshopper_cipher_destroy(gost_grasshopper_cipher_ctx * c)
 183 {
 184     int i;
 185     for (i = 0; i < 2; i++) {
 186         grasshopper_zero128(&c->key.k.k[i]);
 187         grasshopper_zero128(&c->master_key.k.k[i]);
 188     }
 189     for (i = 0; i < GRASSHOPPER_ROUND_KEYS_COUNT; i++) {
 190         grasshopper_zero128(&c->encrypt_round_keys.k[i]);
 191     }
 192     for (i = 0; i < GRASSHOPPER_ROUND_KEYS_COUNT; i++) {
 193         grasshopper_zero128(&c->decrypt_round_keys.k[i]);
 194     }
 195     grasshopper_zero128(&c->buffer);
 196 }
 197
 198 static GRASSHOPPER_INLINE void
 199 gost_grasshopper_cipher_destroy_ctr(gost_grasshopper_cipher_ctx * c)
 200 {
 201     gost_grasshopper_cipher_ctx_ctr *ctx =
 202         (gost_grasshopper_cipher_ctx_ctr *) c;
 203
 204     if (ctx->omac_ctx)
 205         EVP_MD_CTX_free(ctx->omac_ctx);
 206
 207     grasshopper_zero128(&ctx->partial_buffer);
 208 }
 209
 210 int gost_grasshopper_cipher_init(EVP_CIPHER_CTX *ctx,
 211                                  const unsigned char *key,
 212                                  const unsigned char *iv, int enc)
 213 {
 214     gost_grasshopper_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 215
 216     if (EVP_CIPHER_CTX_get_app_data(ctx) == NULL) {
 217         EVP_CIPHER_CTX_set_app_data(ctx, EVP_CIPHER_CTX_get_cipher_data(ctx));
 218     }
 219
 220     if (key != NULL) {
 221         gost_grasshopper_cipher_key(c, key);
 222         gost_grasshopper_master_key(c, key);
 223     }
 224
 225     if (iv != NULL) {
 226         memcpy((unsigned char *)EVP_CIPHER_CTX_original_iv(ctx), iv,
 227                EVP_CIPHER_CTX_iv_length(ctx));
 228     }
 229
 230     memcpy(EVP_CIPHER_CTX_iv_noconst(ctx),
 231            EVP_CIPHER_CTX_original_iv(ctx), EVP_CIPHER_CTX_iv_length(ctx));
 232
 233     grasshopper_zero128(&c->buffer);
 234
 235     return 1;
 236 }
 237
 238 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ecb(EVP_CIPHER_CTX *ctx, const unsigned char
 239                                                         *key, const unsigned char
 240                                                         *iv, int enc)
 241 {
 242     gost_grasshopper_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 243     c->type = GRASSHOPPER_CIPHER_ECB;
 244     return gost_grasshopper_cipher_init(ctx, key, iv, enc);
 245 }
 246
 247 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_cbc(EVP_CIPHER_CTX *ctx, const unsigned char
 248                                                         *key, const unsigned char
 249                                                         *iv, int enc)
 250 {
 251     gost_grasshopper_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 252     c->type = GRASSHOPPER_CIPHER_CBC;
 253     return gost_grasshopper_cipher_init(ctx, key, iv, enc);
 254 }
 255
 256 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ofb(EVP_CIPHER_CTX *ctx, const unsigned char
 257                                                         *key, const unsigned char
 258                                                         *iv, int enc)
 259 {
 260     gost_grasshopper_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 261     c->type = GRASSHOPPER_CIPHER_OFB;
 262     return gost_grasshopper_cipher_init(ctx, key, iv, enc);
 263 }
 264
 265 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_cfb(EVP_CIPHER_CTX *ctx, const unsigned char
 266                                                         *key, const unsigned char
 267                                                         *iv, int enc)
 268 {
 269     gost_grasshopper_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 270     c->type = GRASSHOPPER_CIPHER_CFB;
 271     return gost_grasshopper_cipher_init(ctx, key, iv, enc);
 272 }
 273
 274 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ctr(EVP_CIPHER_CTX *ctx, const unsigned char
 275                                                         *key, const unsigned char
 276                                                         *iv, int enc)
 277 {
 278     gost_grasshopper_cipher_ctx_ctr *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 279
 280     c->c.type = GRASSHOPPER_CIPHER_CTR;
 281     EVP_CIPHER_CTX_set_num(ctx, 0);
 282
 283     grasshopper_zero128(&c->partial_buffer);
 284
 285     return gost_grasshopper_cipher_init(ctx, key, iv, enc);
 286 }
 287
 288 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ctracpkm(EVP_CIPHER_CTX
 289                                                              *ctx, const unsigned
 290                                                              char *key, const unsigned
 291                                                              char *iv, int enc)
 292 {
 293     gost_grasshopper_cipher_ctx_ctr *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 294
 295     /* NB: setting type makes EVP do_cipher callback useless */
 296     c->c.type = GRASSHOPPER_CIPHER_CTRACPKM;
 297     EVP_CIPHER_CTX_set_num(ctx, 0);
 298     c->section_size = 4096;
 299
 300     return gost_grasshopper_cipher_init(ctx, key, iv, enc);
 301 }
 302
 303 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ctracpkm_omac(EVP_CIPHER_CTX
 304                                                              *ctx, const unsigned
 305                                                              char *key, const unsigned
 306                                                              char *iv, int enc)
 307 {
 308         gost_grasshopper_cipher_ctx_ctr *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 309
 310         /* NB: setting type makes EVP do_cipher callback useless */
 311         c->c.type = GRASSHOPPER_CIPHER_CTRACPKMOMAC;
 312         EVP_CIPHER_CTX_set_num(ctx, 0);
 313         c->section_size = 4096;
 314
 315         if (key) {
 316                 unsigned char keys[64];
 317                 const EVP_MD *md = EVP_get_digestbynid(NID_kuznyechik_mac);
 318                 EVP_PKEY *mac_key;
 319
 320                 if (md == NULL)
 321                         return 0;
 322
 323                 if (enc) {
 324                         if (RAND_bytes(c->kdf_seed, 8) != 1)
 325                                 return 0;
 326                 }
 327
 328                 if (gost_kdftree2012_256(keys, 64, key, 32, (const unsigned char *)"kdf tree", 8, c->kdf_seed, 8, 1) <= 0)
 329                         return 0;
 330
 331                 c->omac_ctx = EVP_MD_CTX_new();
 332                 mac_key = EVP_PKEY_new_mac_key(NID_kuznyechik_mac, NULL, keys+32, 32);
 333
 334                 if (mac_key == NULL || c->omac_ctx == NULL) {
 335                         EVP_PKEY_free(mac_key);
 336                         return 0;
 337                 }
 338
 339                 if (EVP_DigestInit_ex(c->omac_ctx, md, NULL) <= 0 ||
 340                                 EVP_DigestSignInit(c->omac_ctx, NULL, md, NULL, mac_key) <= 0) {
 341                         EVP_PKEY_free(mac_key);
 342                         return 0;
 343                 }
 344                 EVP_PKEY_free(mac_key);
 345
 346                 return gost_grasshopper_cipher_init(ctx, keys, iv, enc);
 347         }
 348         return gost_grasshopper_cipher_init(ctx, key, iv, enc);
 349 }
 350
 351 GRASSHOPPER_INLINE int gost_grasshopper_cipher_do(EVP_CIPHER_CTX *ctx,
 352                                                   unsigned char *out,
 353                                                   const unsigned char *in,
 354                                                   size_t inl)
 355 {
 356     gost_grasshopper_cipher_ctx *c =
 357         (gost_grasshopper_cipher_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 358     struct GRASSHOPPER_CIPHER_PARAMS *params = &gost_cipher_params[c->type];
 359
 360     return params->do_cipher(ctx, out, in, inl);
 361 }
 362
 363 int gost_grasshopper_cipher_do_ecb(EVP_CIPHER_CTX *ctx, unsigned char *out,
 364                                    const unsigned char *in, size_t inl)
 365 {
 366     gost_grasshopper_cipher_ctx *c =
 367         (gost_grasshopper_cipher_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 368     bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
 369     const unsigned char *current_in = in;
 370     unsigned char *current_out = out;
 371     size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
 372     size_t i;
 373
 374     for (i = 0; i < blocks;
 375          i++, current_in += GRASSHOPPER_BLOCK_SIZE, current_out +=
 376          GRASSHOPPER_BLOCK_SIZE) {
 377         if (encrypting) {
 378             grasshopper_encrypt_block(&c->encrypt_round_keys,
 379                                       (grasshopper_w128_t *) current_in,
 380                                       (grasshopper_w128_t *) current_out,
 381                                       &c->buffer);
 382         } else {
 383             grasshopper_decrypt_block(&c->decrypt_round_keys,
 384                                       (grasshopper_w128_t *) current_in,
 385                                       (grasshopper_w128_t *) current_out,
 386                                       &c->buffer);
 387         }
 388     }
 389
 390     return 1;
 391 }
 392
 393 int gost_grasshopper_cipher_do_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
 394                                    const unsigned char *in, size_t inl)
 395 {
 396     gost_grasshopper_cipher_ctx *c =
 397         (gost_grasshopper_cipher_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 398     unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
 399     bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
 400     const unsigned char *current_in = in;
 401     unsigned char *current_out = out;
 402     size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
 403     size_t i;
 404     grasshopper_w128_t *currentBlock;
 405
 406     currentBlock = (grasshopper_w128_t *) iv;
 407
 408     for (i = 0; i < blocks;
 409          i++, current_in += GRASSHOPPER_BLOCK_SIZE, current_out +=
 410          GRASSHOPPER_BLOCK_SIZE) {
 411         grasshopper_w128_t *currentInputBlock = (grasshopper_w128_t *) current_in;
 412         grasshopper_w128_t *currentOutputBlock = (grasshopper_w128_t *) current_out;
 413         if (encrypting) {
 414             grasshopper_append128(currentBlock, currentInputBlock);
 415             grasshopper_encrypt_block(&c->encrypt_round_keys, currentBlock,
 416                                       currentOutputBlock, &c->buffer);
 417             grasshopper_copy128(currentBlock, currentOutputBlock);
 418         } else {
 419             grasshopper_w128_t tmp;
 420
 421             grasshopper_copy128(&tmp, currentInputBlock);
 422             grasshopper_decrypt_block(&c->decrypt_round_keys,
 423                                       currentInputBlock, currentOutputBlock,
 424                                       &c->buffer);
 425             grasshopper_append128(currentOutputBlock, currentBlock);
 426             grasshopper_copy128(currentBlock, &tmp);
 427         }
 428     }
 429
 430     return 1;
 431 }
 432
 433 void inc_counter(unsigned char *counter, size_t counter_bytes)
 434 {
 435     unsigned int n = counter_bytes;
 436
 437     do {
 438         unsigned char c;
 439         --n;
 440         c = counter[n];
 441         ++c;
 442         counter[n] = c;
 443         if (c)
 444             return;
 445     } while (n);
 446 }
 447
 448 /* increment counter (128-bit int) by 1 */
 449 static void ctr128_inc(unsigned char *counter)
 450 {
 451     inc_counter(counter, 16);
 452 }
 453
 454 int gost_grasshopper_cipher_do_ctr(EVP_CIPHER_CTX *ctx, unsigned char *out,
 455                                    const unsigned char *in, size_t inl)
 456 {
 457     gost_grasshopper_cipher_ctx_ctr *c = (gost_grasshopper_cipher_ctx_ctr *)
 458         EVP_CIPHER_CTX_get_cipher_data(ctx);
 459     unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
 460     const unsigned char *current_in = in;
 461     unsigned char *current_out = out;
 462     grasshopper_w128_t *currentInputBlock;
 463     grasshopper_w128_t *currentOutputBlock;
 464     unsigned int n = EVP_CIPHER_CTX_num(ctx);
 465     size_t lasted = inl;
 466     size_t i;
 467     size_t blocks;
 468     grasshopper_w128_t *iv_buffer;
 469     grasshopper_w128_t tmp;
 470
 471     while (n && lasted) {
 472         *(current_out++) = *(current_in++) ^ c->partial_buffer.b[n];
 473         --lasted;
 474         n = (n + 1) % GRASSHOPPER_BLOCK_SIZE;
 475     }
 476     EVP_CIPHER_CTX_set_num(ctx, n);
 477     blocks = lasted / GRASSHOPPER_BLOCK_SIZE;
 478
 479     iv_buffer = (grasshopper_w128_t *) iv;
 480
 481     // full parts
 482     for (i = 0; i < blocks; i++) {
 483         currentInputBlock = (grasshopper_w128_t *) current_in;
 484         currentOutputBlock = (grasshopper_w128_t *) current_out;
 485         grasshopper_encrypt_block(&c->c.encrypt_round_keys, iv_buffer,
 486                                   &c->partial_buffer, &c->c.buffer);
 487         grasshopper_plus128(&tmp, &c->partial_buffer, currentInputBlock);
 488         grasshopper_copy128(currentOutputBlock, &tmp);
 489         ctr128_inc(iv_buffer->b);
 490         current_in += GRASSHOPPER_BLOCK_SIZE;
 491         current_out += GRASSHOPPER_BLOCK_SIZE;
 492                                 lasted -= GRASSHOPPER_BLOCK_SIZE;
 493     }
 494
 495     if (lasted > 0) {
 496         currentInputBlock = (grasshopper_w128_t *) current_in;
 497         currentOutputBlock = (grasshopper_w128_t *) current_out;
 498         grasshopper_encrypt_block(&c->c.encrypt_round_keys, iv_buffer,
 499                                   &c->partial_buffer, &c->c.buffer);
 500         for (i = 0; i < lasted; i++) {
 501             currentOutputBlock->b[i] =
 502                 c->partial_buffer.b[i] ^ currentInputBlock->b[i];
 503         }
 504         EVP_CIPHER_CTX_set_num(ctx, i);
 505         ctr128_inc(iv_buffer->b);
 506     }
 507
 508     return inl;
 509 }
 510
 511 #define GRASSHOPPER_BLOCK_MASK (GRASSHOPPER_BLOCK_SIZE - 1)
 512 static inline void apply_acpkm_grasshopper(gost_grasshopper_cipher_ctx_ctr *
 513                                            ctx, unsigned int *num)
 514 {
 515     if (!ctx->section_size || (*num < ctx->section_size))
 516         return;
 517     acpkm_next(&ctx->c);
 518     *num &= GRASSHOPPER_BLOCK_MASK;
 519 }
 520
 521 /* If meshing is not configured via ctrl (setting section_size)
 522  * this function works exactly like plain ctr */
 523 int gost_grasshopper_cipher_do_ctracpkm(EVP_CIPHER_CTX *ctx,
 524                                         unsigned char *out,
 525                                         const unsigned char *in, size_t inl)
 526 {
 527     gost_grasshopper_cipher_ctx_ctr *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 528     unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
 529     unsigned int num = EVP_CIPHER_CTX_num(ctx);
 530     size_t blocks, i, lasted = inl;
 531     grasshopper_w128_t tmp;
 532
 533     while ((num & GRASSHOPPER_BLOCK_MASK) && lasted) {
 534         *out++ = *in++ ^ c->partial_buffer.b[num & GRASSHOPPER_BLOCK_MASK];
 535         --lasted;
 536         num++;
 537     }
 538     blocks = lasted / GRASSHOPPER_BLOCK_SIZE;
 539
 540     // full parts
 541     for (i = 0; i < blocks; i++) {
 542         apply_acpkm_grasshopper(c, &num);
 543         grasshopper_encrypt_block(&c->c.encrypt_round_keys,
 544                                   (grasshopper_w128_t *) iv,
 545                                   (grasshopper_w128_t *) & c->partial_buffer,
 546                                   &c->c.buffer);
 547         grasshopper_plus128(&tmp, &c->partial_buffer,
 548                             (grasshopper_w128_t *) in);
 549         grasshopper_copy128((grasshopper_w128_t *) out, &tmp);
 550         ctr128_inc(iv);
 551         in += GRASSHOPPER_BLOCK_SIZE;
 552         out += GRASSHOPPER_BLOCK_SIZE;
 553         num += GRASSHOPPER_BLOCK_SIZE;
 554                                 lasted -= GRASSHOPPER_BLOCK_SIZE;
 555     }
 556
 557     // last part
 558     if (lasted > 0) {
 559         apply_acpkm_grasshopper(c, &num);
 560         grasshopper_encrypt_block(&c->c.encrypt_round_keys,
 561                                   (grasshopper_w128_t *) iv,
 562                                   &c->partial_buffer, &c->c.buffer);
 563         for (i = 0; i < lasted; i++)
 564             out[i] = c->partial_buffer.b[i] ^ in[i];
 565         ctr128_inc(iv);
 566         num += lasted;
 567     }
 568     EVP_CIPHER_CTX_set_num(ctx, num);
 569
 570     return inl;
 571 }
 572
 573 int gost_grasshopper_cipher_do_ctracpkm_omac(EVP_CIPHER_CTX *ctx,
 574                                         unsigned char *out,
 575                                         const unsigned char *in, size_t inl)
 576 {
 577         int result;
 578   gost_grasshopper_cipher_ctx_ctr *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 579         /* As in and out can be the same pointer, process unencrypted here */
 580         if (EVP_CIPHER_CTX_encrypting(ctx))
 581                 EVP_DigestSignUpdate(c->omac_ctx, in, inl);
 582
 583         if (in == NULL && inl == 0) { /* Final call */
 584                 return gost2015_final_call(ctx, c->omac_ctx, KUZNYECHIK_MAC_MAX_SIZE, c->tag, gost_grasshopper_cipher_do_ctracpkm);
 585         }
 586
 587         result = gost_grasshopper_cipher_do_ctracpkm(ctx, out, in, inl);
 588
 589         /* As in and out can be the same pointer, process decrypted here */
 590         if (!EVP_CIPHER_CTX_encrypting(ctx))
 591                 EVP_DigestSignUpdate(c->omac_ctx, out, inl);
 592
 593         return result;
 594 }
 595 /*
 596  * Fixed 128-bit IV implementation make shift regiser redundant.
 597  */
 598 static void gost_grasshopper_cnt_next(gost_grasshopper_cipher_ctx * ctx,
 599                                       grasshopper_w128_t * iv,
 600                                       grasshopper_w128_t * buf)
 601 {
 602     grasshopper_w128_t tmp;
 603     memcpy(&tmp, iv, 16);
 604     grasshopper_encrypt_block(&ctx->encrypt_round_keys, &tmp,
 605                               buf, &ctx->buffer);
 606     memcpy(iv, buf, 16);
 607 }
 608
 609 int gost_grasshopper_cipher_do_ofb(EVP_CIPHER_CTX *ctx, unsigned char *out,
 610                                    const unsigned char *in, size_t inl)
 611 {
 612     gost_grasshopper_cipher_ctx *c = (gost_grasshopper_cipher_ctx *)
 613         EVP_CIPHER_CTX_get_cipher_data(ctx);
 614     const unsigned char *in_ptr = in;
 615     unsigned char *out_ptr = out;
 616     unsigned char *buf = EVP_CIPHER_CTX_buf_noconst(ctx);
 617     unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
 618     int num = EVP_CIPHER_CTX_num(ctx);
 619     size_t i = 0;
 620     size_t j;
 621
 622     /* process partial block if any */
 623     if (num > 0) {
 624         for (j = (size_t)num, i = 0; j < GRASSHOPPER_BLOCK_SIZE && i < inl;
 625              j++, i++, in_ptr++, out_ptr++) {
 626             *out_ptr = buf[j] ^ (*in_ptr);
 627         }
 628         if (j == GRASSHOPPER_BLOCK_SIZE) {
 629             EVP_CIPHER_CTX_set_num(ctx, 0);
 630         } else {
 631             EVP_CIPHER_CTX_set_num(ctx, (int)j);
 632             return 1;
 633         }
 634     }
 635
 636     for (; i + GRASSHOPPER_BLOCK_SIZE <
 637          inl;
 638          i += GRASSHOPPER_BLOCK_SIZE, in_ptr +=
 639          GRASSHOPPER_BLOCK_SIZE, out_ptr += GRASSHOPPER_BLOCK_SIZE) {
 640         /*
 641          * block cipher current iv
 642          */
 643         /* Encrypt */
 644         gost_grasshopper_cnt_next(c, (grasshopper_w128_t *) iv,
 645                                   (grasshopper_w128_t *) buf);
 646
 647         /*
 648          * xor next block of input text with it and output it
 649          */
 650         /*
 651          * output this block
 652          */
 653         for (j = 0; j < GRASSHOPPER_BLOCK_SIZE; j++) {
 654             out_ptr[j] = buf[j] ^ in_ptr[j];
 655         }
 656     }
 657
 658     /* Process rest of buffer */
 659     if (i < inl) {
 660         gost_grasshopper_cnt_next(c, (grasshopper_w128_t *) iv,
 661                                   (grasshopper_w128_t *) buf);
 662         for (j = 0; i < inl; j++, i++) {
 663             out_ptr[j] = buf[j] ^ in_ptr[j];
 664         }
 665         EVP_CIPHER_CTX_set_num(ctx, (int)j);
 666     } else {
 667         EVP_CIPHER_CTX_set_num(ctx, 0);
 668     }
 669
 670     return 1;
 671 }
 672
 673 int gost_grasshopper_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
 674                                    const unsigned char *in, size_t inl)
 675 {
 676     gost_grasshopper_cipher_ctx *c =
 677         (gost_grasshopper_cipher_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 678     const unsigned char *in_ptr = in;
 679     unsigned char *out_ptr = out;
 680     unsigned char *buf = EVP_CIPHER_CTX_buf_noconst(ctx);
 681     unsigned char *iv = EVP_CIPHER_CTX_iv_noconst(ctx);
 682     bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
 683     int num = EVP_CIPHER_CTX_num(ctx);
 684     size_t i = 0;
 685     size_t j = 0;
 686
 687     /* process partial block if any */
 688     if (num > 0) {
 689         for (j = (size_t)num, i = 0; j < GRASSHOPPER_BLOCK_SIZE && i < inl;
 690              j++, i++, in_ptr++, out_ptr++) {
 691             if (!encrypting) {
 692                 buf[j + GRASSHOPPER_BLOCK_SIZE] = *in_ptr;
 693             }
 694             *out_ptr = buf[j] ^ (*in_ptr);
 695             if (encrypting) {
 696                 buf[j + GRASSHOPPER_BLOCK_SIZE] = *out_ptr;
 697             }
 698         }
 699         if (j == GRASSHOPPER_BLOCK_SIZE) {
 700             memcpy(iv, buf + GRASSHOPPER_BLOCK_SIZE, GRASSHOPPER_BLOCK_SIZE);
 701             EVP_CIPHER_CTX_set_num(ctx, 0);
 702         } else {
 703             EVP_CIPHER_CTX_set_num(ctx, (int)j);
 704             return 1;
 705         }
 706     }
 707
 708     for (; i + GRASSHOPPER_BLOCK_SIZE <
 709          inl;
 710          i += GRASSHOPPER_BLOCK_SIZE, in_ptr +=
 711          GRASSHOPPER_BLOCK_SIZE, out_ptr += GRASSHOPPER_BLOCK_SIZE) {
 712         /*
 713          * block cipher current iv
 714          */
 715         grasshopper_encrypt_block(&c->encrypt_round_keys,
 716                                   (grasshopper_w128_t *) iv,
 717                                   (grasshopper_w128_t *) buf, &c->buffer);
 718         /*
 719          * xor next block of input text with it and output it
 720          */
 721         /*
 722          * output this block
 723          */
 724         if (!encrypting) {
 725             memcpy(iv, in_ptr, GRASSHOPPER_BLOCK_SIZE);
 726         }
 727         for (j = 0; j < GRASSHOPPER_BLOCK_SIZE; j++) {
 728             out_ptr[j] = buf[j] ^ in_ptr[j];
 729         }
 730         /* Encrypt */
 731         /* Next iv is next block of cipher text */
 732         if (encrypting) {
 733             memcpy(iv, out_ptr, GRASSHOPPER_BLOCK_SIZE);
 734         }
 735     }
 736
 737     /* Process rest of buffer */
 738     if (i < inl) {
 739         grasshopper_encrypt_block(&c->encrypt_round_keys,
 740                                   (grasshopper_w128_t *) iv,
 741                                   (grasshopper_w128_t *) buf, &c->buffer);
 742         if (!encrypting) {
 743             memcpy(buf + GRASSHOPPER_BLOCK_SIZE, in_ptr, inl - i);
 744         }
 745         for (j = 0; i < inl; j++, i++) {
 746             out_ptr[j] = buf[j] ^ in_ptr[j];
 747         }
 748         EVP_CIPHER_CTX_set_num(ctx, (int)j);
 749         if (encrypting) {
 750             memcpy(buf + GRASSHOPPER_BLOCK_SIZE, out_ptr, j);
 751         }
 752     } else {
 753         EVP_CIPHER_CTX_set_num(ctx, 0);
 754     }
 755
 756     return 1;
 757 }
 758
 759 int gost_grasshopper_cipher_cleanup(EVP_CIPHER_CTX *ctx)
 760 {
 761     struct GRASSHOPPER_CIPHER_PARAMS *params;
 762     gost_grasshopper_cipher_ctx *c =
 763         (gost_grasshopper_cipher_ctx *) EVP_CIPHER_CTX_get_cipher_data(ctx);
 764
 765     if (!c)
 766         return 1;
 767
 768     params = &gost_cipher_params[c->type];
 769
 770     gost_grasshopper_cipher_destroy(c);
 771     if (params->destroy_cipher != NULL) {
 772         params->destroy_cipher(c);
 773     }
 774
 775     EVP_CIPHER_CTX_set_app_data(ctx, NULL);
 776
 777     return 1;
 778 }
 779
 780 int gost_grasshopper_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
 781 {
 782         if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_CTR_MODE) {
 783                 gost_grasshopper_cipher_ctx_ctr *ctr = EVP_CIPHER_CTX_get_cipher_data(ctx);
 784
 785                 /* CMS implies 256kb section_size */
 786                 ctr->section_size = 256*1024;
 787
 788                 return gost2015_set_asn1_params(params, EVP_CIPHER_CTX_original_iv(ctx), 8,
 789                                 ctr->kdf_seed);
 790         }
 791         return 0;
 792 }
 793
 794 GRASSHOPPER_INLINE int gost_grasshopper_get_asn1_parameters(EVP_CIPHER_CTX
 795                                                             *ctx, ASN1_TYPE
 796                                                             *params)
 797 {
 798         if (EVP_CIPHER_CTX_mode(ctx) == EVP_CIPH_CTR_MODE) {
 799                 gost_grasshopper_cipher_ctx_ctr *ctr = EVP_CIPHER_CTX_get_cipher_data(ctx);
 800
 801                 int iv_len = 16;
 802                 unsigned char iv[16];
 803
 804                 if (gost2015_get_asn1_params(params, 16, iv, 8, ctr->kdf_seed) == 0) {
 805                         return 0;
 806                 }
 807
 808                 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), iv, iv_len);
 809                 memcpy((unsigned char *)EVP_CIPHER_CTX_original_iv(ctx), iv, iv_len);
 810
 811                 /* CMS implies 256kb section_size */
 812                 ctr->section_size = 256*1024;
 813                 return 1;
 814         }
 815         return 0;
 816 }
 817
 818 int gost_grasshopper_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg,
 819                                 void *ptr)
 820 {
 821     switch (type) {
 822     case EVP_CTRL_RAND_KEY:{
 823             if (RAND_priv_bytes
 824                 ((unsigned char *)ptr, EVP_CIPHER_CTX_key_length(ctx)) <= 0) {
 825                 GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_CTL, GOST_R_RNG_ERROR);
 826                 return -1;
 827             }
 828             break;
 829         }
 830     case EVP_CTRL_KEY_MESH:{
 831             gost_grasshopper_cipher_ctx_ctr *c =
 832                 EVP_CIPHER_CTX_get_cipher_data(ctx);
 833             if ((c->c.type != GRASSHOPPER_CIPHER_CTRACPKM &&
 834                                                     c->c.type != GRASSHOPPER_CIPHER_CTRACPKMOMAC)
 835                                                     || (arg == 0)
 836                 || (arg % GRASSHOPPER_BLOCK_SIZE))
 837                 return -1;
 838             c->section_size = arg;
 839             break;
 840         }
 841 #ifdef EVP_CTRL_TLS1_2_TLSTREE
 842     case EVP_CTRL_TLS1_2_TLSTREE:
 843         {
 844           unsigned char newkey[32];
 845           int mode = EVP_CIPHER_CTX_mode(ctx);
 846           static const unsigned char zeroseq[8];
 847           gost_grasshopper_cipher_ctx_ctr *ctr_ctx = NULL;
 848           gost_grasshopper_cipher_ctx *c = NULL;
 849
 850           unsigned char adjusted_iv[16];
 851           unsigned char seq[8];
 852           int j, carry;
 853           if (mode != EVP_CIPH_CTR_MODE)
 854             return -1;
 855
 856           ctr_ctx = (gost_grasshopper_cipher_ctx_ctr *)
 857             EVP_CIPHER_CTX_get_cipher_data(ctx);
 858           c = &(ctr_ctx->c);
 859
 860           memcpy(seq, ptr, 8);
 861           if (EVP_CIPHER_CTX_encrypting(ctx)) {
 862             /*
 863              * OpenSSL increments seq after mac calculation.
 864              * As we have Mac-Then-Encrypt, we need decrement it here on encryption
 865              * to derive the key correctly.
 866              * */
 867             if (memcmp(seq, zeroseq, 8) != 0)
 868             {
 869               for(j=7; j>=0; j--)
 870               {
 871                 if (seq[j] != 0) {seq[j]--; break;}
 872                 else seq[j]  = 0xFF;
 873               }
 874             }
 875           }
 876           if (gost_tlstree(NID_grasshopper_cbc, c->master_key.k.b, newkey,
 877                 (const unsigned char *)seq) > 0) {
 878             memset(adjusted_iv, 0, 16);
 879             memcpy(adjusted_iv, EVP_CIPHER_CTX_original_iv(ctx), 8);
 880             for(j=7,carry=0; j>=0; j--)
 881             {
 882               int adj_byte = adjusted_iv[j]+seq[j]+carry;
 883               carry = (adj_byte > 255) ? 1 : 0;
 884               adjusted_iv[j] = adj_byte & 0xFF;
 885             }
 886             EVP_CIPHER_CTX_set_num(ctx, 0);
 887             memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), adjusted_iv, 16);
 888
 889             gost_grasshopper_cipher_key(c, newkey);
 890             return 1;
 891           }
 892         }
 893         return -1;
 894 #endif
 895 #if 0
 896     case EVP_CTRL_AEAD_GET_TAG:
 897     case EVP_CTRL_AEAD_SET_TAG:
 898         {
 899             int taglen = arg;
 900             unsigned char *tag = ptr;
 901
 902             gost_grasshopper_cipher_ctx *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 903             if (c->c.type != GRASSHOPPER_CIPHER_MGM)
 904                 return -1;
 905
 906             if (taglen > KUZNYECHIK_MAC_MAX_SIZE) {
 907                 CRYPTOCOMerr(CRYPTOCOM_F_GOST_GRASSHOPPER_CIPHER_CTL,
 908                         CRYPTOCOM_R_INVALID_TAG_LENGTH);
 909                 return -1;
 910             }
 911
 912             if (type == EVP_CTRL_AEAD_GET_TAG)
 913                 memcpy(tag, c->final_tag, taglen);
 914             else
 915                 memcpy(c->final_tag, tag, taglen);
 916
 917             return 1;
 918         }
 919 #endif
 920                 case EVP_CTRL_PROCESS_UNPROTECTED:
 921                                 {
 922                                         gost_grasshopper_cipher_ctx_ctr *c = EVP_CIPHER_CTX_get_cipher_data(ctx);
 923                                         ASN1_OBJECT *cmsmacobj = NULL;
 924                                         if (c->c.type != GRASSHOPPER_CIPHER_CTRACPKMOMAC)
 925                                                 return -1;
 926           cmsmacobj = OBJ_txt2obj(OID_GOST_CMS_MAC, 1);
 927                                         if (cmsmacobj == NULL) {
 928                                                 GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_CTL, ERR_R_MALLOC_FAILURE);
 929                                                 return -1;
 930                                         }
 931                                         if (arg == 0) /*Decrypting*/ {
 932                                                 STACK_OF(X509_ATTRIBUTE) *x = ptr;
 933                                                 ASN1_OCTET_STRING *osExpectedMac = X509at_get0_data_by_OBJ(x,
 934                                                                 cmsmacobj, -3, V_ASN1_OCTET_STRING);
 935                                                 ASN1_OBJECT_free(cmsmacobj);
 936
 937                                                 if (ptr == NULL || osExpectedMac ==NULL || osExpectedMac->length != KUZNYECHIK_MAC_MAX_SIZE)
 938                                                         return -1;
 939
 940                                                 memcpy(c->tag, osExpectedMac->data, osExpectedMac->length);
 941                                                 return 1;
 942                                         } else {
 943                                                 STACK_OF(X509_ATTRIBUTE) *x = ptr;
 944                                                 return (X509at_add1_attr_by_OBJ(&x, cmsmacobj,
 945                                                                         V_ASN1_OCTET_STRING, c->tag, KUZNYECHIK_MAC_MAX_SIZE) == NULL) ? -1 : 1;
 946                                         }
 947                                 }
 948                         return 1;
 949     case EVP_CTRL_COPY: {
 950                         EVP_CIPHER_CTX *out = ptr;
 951
 952       gost_grasshopper_cipher_ctx_ctr *out_cctx = EVP_CIPHER_CTX_get_cipher_data(out);
 953       gost_grasshopper_cipher_ctx_ctr *in_cctx  = EVP_CIPHER_CTX_get_cipher_data(ctx);
 954
 955       if (in_cctx->c.type != GRASSHOPPER_CIPHER_CTRACPKMOMAC)
 956           return -1;
 957
 958                         if (in_cctx->omac_ctx == out_cctx->omac_ctx) {
 959                                 out_cctx->omac_ctx = EVP_MD_CTX_new();
 960                                 if (out_cctx->omac_ctx == NULL) {
 961                                         GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_CTL, ERR_R_MALLOC_FAILURE);
 962                                         return -1;
 963                                 }
 964                         }
 965                         return EVP_MD_CTX_copy(out_cctx->omac_ctx, in_cctx->omac_ctx);
 966                 }
 967     default:
 968         GOSTerr(GOST_F_GOST_GRASSHOPPER_CIPHER_CTL,
 969                 GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
 970         return -1;
 971     }
 972     return 1;
 973 }
 974
 975 GRASSHOPPER_INLINE EVP_CIPHER *cipher_gost_grasshopper_create(int
 976                                                               cipher_type, int
 977                                                               block_size)
 978 {
 979     return EVP_CIPHER_meth_new(cipher_type, block_size /* block_size */ ,
 980                                GRASSHOPPER_KEY_SIZE /* key_size */ );
 981 }
 982
 983 const int cipher_gost_grasshopper_setup(EVP_CIPHER *cipher, uint8_t mode,
 984                                         int iv_size, bool padding, int extra_flags)
 985 {
 986         unsigned long flags = (unsigned long)(mode
 987                  | ((!padding) ?  EVP_CIPH_NO_PADDING : 0)
 988                                          | ((iv_size >  0) ?  EVP_CIPH_CUSTOM_IV : 0)
 989                                          | EVP_CIPH_RAND_KEY |  EVP_CIPH_ALWAYS_CALL_INIT
 990                                          | extra_flags);
 991
 992     return EVP_CIPHER_meth_set_iv_length(cipher, iv_size)
 993         && EVP_CIPHER_meth_set_flags(cipher, flags)
 994         && EVP_CIPHER_meth_set_cleanup(cipher, gost_grasshopper_cipher_cleanup)
 995         && EVP_CIPHER_meth_set_set_asn1_params(cipher,
 996                                                gost_grasshopper_set_asn1_parameters)
 997         && EVP_CIPHER_meth_set_get_asn1_params(cipher,
 998                                                gost_grasshopper_get_asn1_parameters)
 999         && EVP_CIPHER_meth_set_ctrl(cipher, gost_grasshopper_cipher_ctl)
1000         && EVP_CIPHER_meth_set_do_cipher(cipher, gost_grasshopper_cipher_do);
1001 }
1002
1003 const GRASSHOPPER_INLINE EVP_CIPHER *cipher_gost_grasshopper(uint8_t mode,
1004                                                              uint8_t num)
1005 {
1006     EVP_CIPHER **cipher;
1007     struct GRASSHOPPER_CIPHER_PARAMS *params;
1008
1009     cipher = &gost_grasshopper_ciphers[num];
1010
1011     if (*cipher == NULL) {
1012         grasshopper_init_cipher_func init_cipher;
1013         int nid, block_size, ctx_size, iv_size, extra_flags;
1014         bool padding;
1015
1016         params = &gost_cipher_params[num];
1017
1018         nid = params->nid;
1019         init_cipher = params->init_cipher;
1020         block_size = params->block_size;
1021         ctx_size = params->ctx_size;
1022         iv_size = params->iv_size;
1023         padding = params->padding;
1024                                 extra_flags = params->extra_flags;
1025
1026         *cipher = cipher_gost_grasshopper_create(nid, block_size);
1027         if (*cipher == NULL) {
1028             return NULL;
1029         }
1030
1031         if (!cipher_gost_grasshopper_setup(*cipher, mode, iv_size, padding, extra_flags)
1032             || !EVP_CIPHER_meth_set_init(*cipher, init_cipher)
1033             || !EVP_CIPHER_meth_set_impl_ctx_size(*cipher, ctx_size)) {
1034             EVP_CIPHER_meth_free(*cipher);
1035             *cipher = NULL;
1036         }
1037     }
1038
1039     return *cipher;
1040 }
1041
1042 const GRASSHOPPER_INLINE EVP_CIPHER *cipher_gost_grasshopper_ecb()
1043 {
1044     return cipher_gost_grasshopper(EVP_CIPH_ECB_MODE, GRASSHOPPER_CIPHER_ECB);
1045 }
1046
1047 const GRASSHOPPER_INLINE EVP_CIPHER *cipher_gost_grasshopper_cbc()
1048 {
1049     return cipher_gost_grasshopper(EVP_CIPH_CBC_MODE, GRASSHOPPER_CIPHER_CBC);
1050 }
1051
1052 const GRASSHOPPER_INLINE EVP_CIPHER *cipher_gost_grasshopper_ofb()
1053 {
1054     return cipher_gost_grasshopper(EVP_CIPH_OFB_MODE, GRASSHOPPER_CIPHER_OFB);
1055 }
1056
1057 const GRASSHOPPER_INLINE EVP_CIPHER *cipher_gost_grasshopper_cfb()
1058 {
1059     return cipher_gost_grasshopper(EVP_CIPH_CFB_MODE, GRASSHOPPER_CIPHER_CFB);
1060 }
1061
1062 const GRASSHOPPER_INLINE EVP_CIPHER *cipher_gost_grasshopper_ctr()
1063 {
1064     return cipher_gost_grasshopper(EVP_CIPH_CTR_MODE, GRASSHOPPER_CIPHER_CTR);
1065 }
1066
1067 const GRASSHOPPER_INLINE EVP_CIPHER *cipher_gost_grasshopper_ctracpkm()
1068 {
1069     return cipher_gost_grasshopper(EVP_CIPH_CTR_MODE,
1070                                    GRASSHOPPER_CIPHER_CTRACPKM);
1071 }
1072
1073 const GRASSHOPPER_INLINE EVP_CIPHER *cipher_gost_grasshopper_ctracpkm_omac()
1074 {
1075     return cipher_gost_grasshopper(EVP_CIPH_CTR_MODE,
1076                                    GRASSHOPPER_CIPHER_CTRACPKMOMAC);
1077 }
1078
1079 void cipher_gost_grasshopper_destroy(void)
1080 {
1081     EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_ECB]);
1082     gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_ECB] = NULL;
1083     EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CBC]);
1084     gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CBC] = NULL;
1085     EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_OFB]);
1086     gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_OFB] = NULL;
1087     EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CFB]);
1088     gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CFB] = NULL;
1089     EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CTR]);
1090     gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CTR] = NULL;
1091     EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CTRACPKM]);
1092     gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CTRACPKM] = NULL;
1093     EVP_CIPHER_meth_free(gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CTRACPKMOMAC]);
1094     gost_grasshopper_ciphers[GRASSHOPPER_CIPHER_CTRACPKMOMAC] = NULL;
1095 }