3 * This file is distributed under the same license as OpenSSL
6 #if defined(__cplusplus)
10 #include "gost_grasshopper_cipher.h"
11 #include "gost_grasshopper_defines.h"
12 #include "gost_grasshopper_math.h"
13 #include "gost_grasshopper_core.h"
15 #include <openssl/evp.h>
16 #include <openssl/rand.h>
17 #include <openssl/err.h>
20 #include "e_gost_err.h"
22 enum GRASSHOPPER_CIPHER_TYPE {
23 GRASSHOPPER_CIPHER_ECB = 0,
24 GRASSHOPPER_CIPHER_CBC,
25 GRASSHOPPER_CIPHER_OFB,
26 GRASSHOPPER_CIPHER_CFB,
27 GRASSHOPPER_CIPHER_CTR
30 static EVP_CIPHER* gost_grasshopper_ciphers[5] = {
31 [GRASSHOPPER_CIPHER_ECB] = NULL,
32 [GRASSHOPPER_CIPHER_CBC] = NULL,
33 [GRASSHOPPER_CIPHER_OFB] = NULL,
34 [GRASSHOPPER_CIPHER_CFB] = NULL,
35 [GRASSHOPPER_CIPHER_CTR] = NULL
38 static GRASSHOPPER_INLINE void gost_grasshopper_cipher_destroy_ofb(gost_grasshopper_cipher_ctx* c);
39 static GRASSHOPPER_INLINE void gost_grasshopper_cipher_destroy_ctr(gost_grasshopper_cipher_ctx* c);
41 struct GRASSHOPPER_CIPHER_PARAMS {
43 grasshopper_init_cipher_func init_cipher;
44 grasshopper_do_cipher_func do_cipher;
45 grasshopper_destroy_cipher_func destroy_cipher;
52 static struct GRASSHOPPER_CIPHER_PARAMS gost_cipher_params[5] = {
53 [GRASSHOPPER_CIPHER_ECB] = {
55 gost_grasshopper_cipher_init_ecb,
56 gost_grasshopper_cipher_do_ecb,
59 sizeof(gost_grasshopper_cipher_ctx),
63 [GRASSHOPPER_CIPHER_CBC] = {
65 gost_grasshopper_cipher_init_cbc,
66 gost_grasshopper_cipher_do_cbc,
69 sizeof(gost_grasshopper_cipher_ctx),
73 [GRASSHOPPER_CIPHER_OFB] = {
75 gost_grasshopper_cipher_init_ofb,
76 gost_grasshopper_cipher_do_ofb,
77 gost_grasshopper_cipher_destroy_ofb,
79 sizeof(gost_grasshopper_cipher_ctx_ofb),
83 [GRASSHOPPER_CIPHER_CFB] = {
85 gost_grasshopper_cipher_init_cfb,
86 gost_grasshopper_cipher_do_cfb,
89 sizeof(gost_grasshopper_cipher_ctx),
93 [GRASSHOPPER_CIPHER_CTR] = {
95 gost_grasshopper_cipher_init_ctr,
96 gost_grasshopper_cipher_do_ctr,
97 gost_grasshopper_cipher_destroy_ctr,
99 sizeof(gost_grasshopper_cipher_ctx),
105 /* Set 256 bit key into context */
106 static GRASSHOPPER_INLINE void gost_grasshopper_cipher_key(gost_grasshopper_cipher_ctx* c, const uint8_t* k) {
108 for (i = 0; i < 2; i++) {
109 grasshopper_copy128(&c->key.k.k[i], (const grasshopper_w128_t*) (k + i * 16));
111 grasshopper_set_encrypt_key(&c->encrypt_round_keys, &c->key);
112 grasshopper_set_decrypt_key(&c->decrypt_round_keys, &c->key);
115 /* Cleans up key from context */
116 static GRASSHOPPER_INLINE void gost_grasshopper_cipher_destroy(gost_grasshopper_cipher_ctx* c) {
118 for (i = 0; i < 2; i++) {
119 grasshopper_zero128(&c->key.k.k[i]);
121 for (i = 0; i < GRASSHOPPER_ROUND_KEYS_COUNT; i++) {
122 grasshopper_zero128(&c->encrypt_round_keys.k[i]);
124 for (i = 0; i < GRASSHOPPER_ROUND_KEYS_COUNT; i++) {
125 grasshopper_zero128(&c->decrypt_round_keys.k[i]);
127 grasshopper_zero128(&c->buffer);
130 static GRASSHOPPER_INLINE void gost_grasshopper_cipher_destroy_ofb(gost_grasshopper_cipher_ctx* c) {
131 gost_grasshopper_cipher_ctx_ofb* ctx = (gost_grasshopper_cipher_ctx_ofb*) c;
133 grasshopper_zero128(&ctx->buffer1);
136 static GRASSHOPPER_INLINE void gost_grasshopper_cipher_destroy_ctr(gost_grasshopper_cipher_ctx* c) {
137 gost_grasshopper_cipher_ctx_ctr* ctx = (gost_grasshopper_cipher_ctx_ctr*) c;
139 grasshopper_zero128(&ctx->iv_buffer);
140 grasshopper_zero128(&ctx->partial_buffer);
145 static int gost_grasshopper_cipher_init(EVP_CIPHER_CTX* ctx, const unsigned char* key,
146 const unsigned char* iv, int enc) {
147 gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
149 if (EVP_CIPHER_CTX_get_app_data(ctx) == NULL) {
150 EVP_CIPHER_CTX_set_app_data(ctx, EVP_CIPHER_CTX_get_cipher_data(ctx));
154 gost_grasshopper_cipher_key(c, key);
158 memcpy((unsigned char*) EVP_CIPHER_CTX_original_iv(ctx), iv,
159 EVP_CIPHER_CTX_iv_length(ctx));
162 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx),
163 EVP_CIPHER_CTX_original_iv(ctx),
164 EVP_CIPHER_CTX_iv_length(ctx));
166 grasshopper_zero128(&c->buffer);
171 static GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ecb(EVP_CIPHER_CTX* ctx, const unsigned char* key,
172 const unsigned char* iv,
174 gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
175 c->type = GRASSHOPPER_CIPHER_ECB;
176 return gost_grasshopper_cipher_init(ctx, key, iv, enc);
179 static GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_cbc(EVP_CIPHER_CTX* ctx, const unsigned char* key,
180 const unsigned char* iv,
182 gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
183 c->type = GRASSHOPPER_CIPHER_CBC;
184 return gost_grasshopper_cipher_init(ctx, key, iv, enc);
187 static GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ofb(EVP_CIPHER_CTX* ctx, const unsigned char* key,
188 const unsigned char* iv,
190 gost_grasshopper_cipher_ctx_ofb* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
192 c->c.type = GRASSHOPPER_CIPHER_OFB;
194 grasshopper_zero128(&c->buffer1);
196 return gost_grasshopper_cipher_init(ctx, key, iv, enc);
199 static GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_cfb(EVP_CIPHER_CTX* ctx, const unsigned char* key,
200 const unsigned char* iv,
202 gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
203 c->type = GRASSHOPPER_CIPHER_CFB;
204 return gost_grasshopper_cipher_init(ctx, key, iv, enc);
207 static GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ctr(EVP_CIPHER_CTX* ctx, const unsigned char* key,
208 const unsigned char* iv,
210 gost_grasshopper_cipher_ctx_ctr* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
212 c->c.type = GRASSHOPPER_CIPHER_CTR;
214 grasshopper_zero128(&c->iv_buffer);
215 grasshopper_zero128(&c->partial_buffer);
219 return gost_grasshopper_cipher_init(ctx, key, iv, enc);
222 static GRASSHOPPER_INLINE int gost_grasshopper_cipher_do(EVP_CIPHER_CTX* ctx, unsigned char* out,
223 const unsigned char* in, size_t inl) {
224 gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_get_cipher_data(ctx);
225 struct GRASSHOPPER_CIPHER_PARAMS* params = &gost_cipher_params[c->type];
227 return params->do_cipher(ctx, out, in, inl);
230 static int gost_grasshopper_cipher_do_ecb(EVP_CIPHER_CTX* ctx, unsigned char* out,
231 const unsigned char* in, size_t inl) {
232 gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_get_cipher_data(ctx);
233 bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
234 const unsigned char* current_in = in;
235 unsigned char* current_out = out;
236 size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
239 for (i = 0; i < blocks; i++, current_in += GRASSHOPPER_BLOCK_SIZE, current_out += GRASSHOPPER_BLOCK_SIZE) {
241 grasshopper_encrypt_block(&c->encrypt_round_keys, (grasshopper_w128_t*) current_in,
242 (grasshopper_w128_t*) current_out,
245 grasshopper_decrypt_block(&c->decrypt_round_keys, (grasshopper_w128_t*) current_in,
246 (grasshopper_w128_t*) current_out,
254 static int gost_grasshopper_cipher_do_cbc(EVP_CIPHER_CTX* ctx, unsigned char* out,
255 const unsigned char* in, size_t inl) {
256 gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_get_cipher_data(ctx);
257 unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
258 bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
259 const unsigned char* current_in = in;
260 unsigned char* current_out = out;
261 grasshopper_w128_t* currentInputBlock;
262 grasshopper_w128_t* currentOutputBlock;
263 size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
265 grasshopper_w128_t* currentBlock;
267 currentBlock = (grasshopper_w128_t*) iv;
269 for (i = 0; i < blocks; i++, current_in += GRASSHOPPER_BLOCK_SIZE, current_out += GRASSHOPPER_BLOCK_SIZE) {
270 currentInputBlock = (grasshopper_w128_t*) current_in;
271 currentOutputBlock = (grasshopper_w128_t*) current_out;
273 grasshopper_append128(currentBlock, currentInputBlock);
274 grasshopper_encrypt_block(&c->encrypt_round_keys, currentBlock, currentOutputBlock, &c->buffer);
275 grasshopper_copy128(currentBlock, currentOutputBlock);
277 grasshopper_decrypt_block(&c->decrypt_round_keys, currentInputBlock, currentOutputBlock, &c->buffer);
278 grasshopper_append128(currentOutputBlock, currentBlock);
279 grasshopper_copy128(currentBlock, currentInputBlock);
286 static int gost_grasshopper_cipher_do_ctr(EVP_CIPHER_CTX* ctx, unsigned char* out,
287 const unsigned char* in, size_t inl) {
288 gost_grasshopper_cipher_ctx_ctr* c = (gost_grasshopper_cipher_ctx_ctr*) EVP_CIPHER_CTX_get_cipher_data(ctx);
289 unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
290 const unsigned char* current_in = in;
291 unsigned char* current_out = out;
292 size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
293 grasshopper_w128_t* currentInputBlock;
294 grasshopper_w128_t* currentOutputBlock;
298 memcpy(&c->iv_buffer, iv, 8);
301 for (i = 0; i < blocks; i++, current_in += GRASSHOPPER_BLOCK_SIZE, current_out += GRASSHOPPER_BLOCK_SIZE) {
302 currentInputBlock = (grasshopper_w128_t*) current_in;
303 currentOutputBlock = (grasshopper_w128_t*) current_out;
304 memcpy(c->iv_buffer.b + 8, &c->counter, 8);
305 grasshopper_encrypt_block(&c->c.encrypt_round_keys, &c->iv_buffer, currentOutputBlock, &c->c.buffer);
306 grasshopper_append128(currentOutputBlock, currentInputBlock);
311 lasted = inl - blocks * GRASSHOPPER_BLOCK_SIZE;
313 currentInputBlock = (grasshopper_w128_t*) current_in;
314 currentOutputBlock = (grasshopper_w128_t*) current_out;
315 memcpy(c->iv_buffer.b + 8, &c->counter, 8);
316 grasshopper_encrypt_block(&c->c.encrypt_round_keys, &c->iv_buffer, &c->partial_buffer, &c->c.buffer);
317 for (i = 0; i < lasted; i++) {
318 currentOutputBlock->b[i] = c->partial_buffer.b[i] ^ currentInputBlock->b[i];
326 static void gost_grasshopper_cnt_next(gost_grasshopper_cipher_ctx_ofb* ctx, grasshopper_w128_t* iv,
327 grasshopper_w128_t* buf) {
328 memcpy(&ctx->buffer1, iv, 16);
329 ctx->g = ctx->buffer1.b[0] | (ctx->buffer1.b[1] << 8) | (ctx->buffer1.b[2] << 16) |
330 ((uint32_t) ctx->buffer1.b[3] << 24);
331 ctx->g += 0x01010101;
332 ctx->buffer1.b[0] = (unsigned char) (ctx->g & 0xff);
333 ctx->buffer1.b[1] = (unsigned char) ((ctx->g >> 8) & 0xff);
334 ctx->buffer1.b[2] = (unsigned char) ((ctx->g >> 16) & 0xff);
335 ctx->buffer1.b[3] = (unsigned char) ((ctx->g >> 24) & 0xff);
336 ctx->g = ctx->buffer1.b[4] | (ctx->buffer1.b[5] << 8) | (ctx->buffer1.b[6] << 16) |
337 ((uint32_t) ctx->buffer1.b[7] << 24);
339 ctx->g += 0x01010104;
340 if (ctx->go > ctx->g) { /* overflow */
343 ctx->buffer1.b[4] = (unsigned char) (ctx->g & 0xff);
344 ctx->buffer1.b[5] = (unsigned char) ((ctx->g >> 8) & 0xff);
345 ctx->buffer1.b[6] = (unsigned char) ((ctx->g >> 16) & 0xff);
346 ctx->buffer1.b[7] = (unsigned char) ((ctx->g >> 24) & 0xff);
347 ctx->g = ctx->buffer1.b[8] | (ctx->buffer1.b[9] << 8) | (ctx->buffer1.b[10] << 16) |
348 ((uint32_t) ctx->buffer1.b[11] << 24);
350 ctx->g += 0x01010107;
351 if (ctx->go > ctx->g) { /* overflow */
354 ctx->buffer1.b[8] = (unsigned char) (ctx->g & 0xff);
355 ctx->buffer1.b[9] = (unsigned char) ((ctx->g >> 8) & 0xff);
356 ctx->buffer1.b[10] = (unsigned char) ((ctx->g >> 16) & 0xff);
357 ctx->buffer1.b[11] = (unsigned char) ((ctx->g >> 24) & 0xff);
358 ctx->g = ctx->buffer1.b[12] | (ctx->buffer1.b[13] << 8) | (ctx->buffer1.b[14] << 16) |
359 ((uint32_t) ctx->buffer1.b[15] << 24);
361 ctx->g += 0x01010110;
362 if (ctx->go > ctx->g) { /* overflow */
365 ctx->buffer1.b[12] = (unsigned char) (ctx->g & 0xff);
366 ctx->buffer1.b[13] = (unsigned char) ((ctx->g >> 8) & 0xff);
367 ctx->buffer1.b[14] = (unsigned char) ((ctx->g >> 16) & 0xff);
368 ctx->buffer1.b[15] = (unsigned char) ((ctx->g >> 24) & 0xff);
369 memcpy(iv, &ctx->buffer1, 16);
370 grasshopper_encrypt_block(&ctx->c.encrypt_round_keys, &ctx->buffer1, buf, &ctx->c.buffer);
373 static int gost_grasshopper_cipher_do_ofb(EVP_CIPHER_CTX* ctx, unsigned char* out,
374 const unsigned char* in, size_t inl) {
375 gost_grasshopper_cipher_ctx_ofb* c = (gost_grasshopper_cipher_ctx_ofb*) EVP_CIPHER_CTX_get_cipher_data(ctx);
376 const unsigned char* in_ptr = in;
377 unsigned char* out_ptr = out;
378 unsigned char* buf = EVP_CIPHER_CTX_buf_noconst(ctx);
379 unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
380 int num = EVP_CIPHER_CTX_num(ctx);
384 /* process partial block if any */
386 for (j = (size_t) num, i = 0; j < GRASSHOPPER_BLOCK_SIZE && i < inl;
387 j++, i++, in_ptr++, out_ptr++) {
388 *out_ptr = buf[j] ^ (*in_ptr);
390 if (j == GRASSHOPPER_BLOCK_SIZE) {
391 EVP_CIPHER_CTX_set_num(ctx, 0);
393 EVP_CIPHER_CTX_set_num(ctx, (int) j);
398 for (; i + GRASSHOPPER_BLOCK_SIZE <
399 inl; i += GRASSHOPPER_BLOCK_SIZE, in_ptr += GRASSHOPPER_BLOCK_SIZE, out_ptr += GRASSHOPPER_BLOCK_SIZE) {
401 * block cipher current iv
404 gost_grasshopper_cnt_next(c, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf);
407 * xor next block of input text with it and output it
412 for (j = 0; j < GRASSHOPPER_BLOCK_SIZE; j++) {
413 out_ptr[j] = buf[j] ^ in_ptr[j];
417 /* Process rest of buffer */
419 gost_grasshopper_cnt_next(c, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf);
420 for (j = 0; i < inl; j++, i++) {
421 out_ptr[j] = buf[j] ^ in_ptr[j];
423 EVP_CIPHER_CTX_set_num(ctx, (int) j);
425 EVP_CIPHER_CTX_set_num(ctx, 0);
431 static int gost_grasshopper_cipher_do_cfb(EVP_CIPHER_CTX* ctx, unsigned char* out,
432 const unsigned char* in, size_t inl) {
433 gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_get_cipher_data(ctx);
434 const unsigned char* in_ptr = in;
435 unsigned char* out_ptr = out;
436 unsigned char* buf = EVP_CIPHER_CTX_buf_noconst(ctx);
437 unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
438 bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
439 int num = EVP_CIPHER_CTX_num(ctx);
443 /* process partial block if any */
445 for (j = (size_t) num, i = 0; j < GRASSHOPPER_BLOCK_SIZE && i < inl; j++, i++, in_ptr++, out_ptr++) {
447 buf[j + GRASSHOPPER_BLOCK_SIZE] = *in_ptr;
449 *out_ptr = buf[j] ^ (*in_ptr);
451 buf[j + GRASSHOPPER_BLOCK_SIZE] = *out_ptr;
454 if (j == GRASSHOPPER_BLOCK_SIZE) {
455 memcpy(iv, buf + GRASSHOPPER_BLOCK_SIZE, GRASSHOPPER_BLOCK_SIZE);
456 EVP_CIPHER_CTX_set_num(ctx, 0);
458 EVP_CIPHER_CTX_set_num(ctx, (int) j);
463 for (; i + GRASSHOPPER_BLOCK_SIZE <
464 inl; i += GRASSHOPPER_BLOCK_SIZE, in_ptr += GRASSHOPPER_BLOCK_SIZE, out_ptr += GRASSHOPPER_BLOCK_SIZE) {
466 * block cipher current iv
468 grasshopper_encrypt_block(&c->encrypt_round_keys, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf,
471 * xor next block of input text with it and output it
477 memcpy(iv, in_ptr, GRASSHOPPER_BLOCK_SIZE);
479 for (j = 0; j < GRASSHOPPER_BLOCK_SIZE; j++) {
480 out_ptr[j] = buf[j] ^ in_ptr[j];
483 /* Next iv is next block of cipher text */
485 memcpy(iv, out_ptr, GRASSHOPPER_BLOCK_SIZE);
489 /* Process rest of buffer */
491 grasshopper_encrypt_block(&c->encrypt_round_keys, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf,
494 memcpy(buf + GRASSHOPPER_BLOCK_SIZE, in_ptr, inl - i);
496 for (j = 0; i < inl; j++, i++) {
497 out_ptr[j] = buf[j] ^ in_ptr[j];
499 EVP_CIPHER_CTX_set_num(ctx, (int) j);
501 memcpy(buf + GRASSHOPPER_BLOCK_SIZE, out_ptr, j);
504 EVP_CIPHER_CTX_set_num(ctx, 0);
510 static int gost_grasshopper_cipher_cleanup(EVP_CIPHER_CTX* ctx) {
511 gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_get_cipher_data(ctx);
512 struct GRASSHOPPER_CIPHER_PARAMS* params = &gost_cipher_params[c->type];
514 gost_grasshopper_cipher_destroy(c);
515 if (params->destroy_cipher != NULL) {
516 params->destroy_cipher(c);
519 EVP_CIPHER_CTX_set_app_data(ctx, NULL);
524 static int gost_grasshopper_set_asn1_parameters(EVP_CIPHER_CTX* ctx, ASN1_TYPE* params) {
526 unsigned char* buf = NULL;
527 unsigned char* p = NULL;
528 ASN1_OCTET_STRING* os = NULL;
530 os = ASN1_OCTET_STRING_new();
532 if (!os || !ASN1_OCTET_STRING_set(os, buf, len)) {
534 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
539 ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
543 static GRASSHOPPER_INLINE int gost_grasshopper_get_asn1_parameters(EVP_CIPHER_CTX* ctx, ASN1_TYPE* params) {
546 if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) {
553 static int gost_grasshopper_cipher_ctl(EVP_CIPHER_CTX* ctx, int type, int arg, void* ptr) {
555 case EVP_CTRL_RAND_KEY: {
556 if (RAND_bytes((unsigned char*) ptr, EVP_CIPHER_CTX_key_length(ctx)) <= 0) {
557 GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_RNG_ERROR);
563 GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
569 static GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_create(int cipher_type, int block_size) {
570 return EVP_CIPHER_meth_new(cipher_type,
571 block_size /* block_size */,
572 GRASSHOPPER_KEY_SIZE /* key_size */);
575 const int cipher_gost_grasshopper_setup(EVP_CIPHER* cipher, uint8_t mode, int iv_size, bool padding) {
576 return EVP_CIPHER_meth_set_iv_length(cipher, iv_size) &&
577 EVP_CIPHER_meth_set_flags(cipher, (unsigned long) (
579 ((!padding) ? EVP_CIPH_NO_PADDING : 0) |
580 ((iv_size > 0) ? EVP_CIPH_CUSTOM_IV : 0) |
582 EVP_CIPH_ALWAYS_CALL_INIT)
584 EVP_CIPHER_meth_set_cleanup(cipher, gost_grasshopper_cipher_cleanup) &&
585 EVP_CIPHER_meth_set_set_asn1_params(cipher, gost_grasshopper_set_asn1_parameters) &&
586 EVP_CIPHER_meth_set_get_asn1_params(cipher, gost_grasshopper_get_asn1_parameters) &&
587 EVP_CIPHER_meth_set_ctrl(cipher, gost_grasshopper_cipher_ctl) &&
588 EVP_CIPHER_meth_set_do_cipher(cipher, gost_grasshopper_cipher_do);
591 static const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper(uint8_t mode, uint8_t num) {
593 struct GRASSHOPPER_CIPHER_PARAMS* params;
595 cipher = &gost_grasshopper_ciphers[num];
597 if (*cipher == NULL) {
598 params = &gost_cipher_params[num];
600 int nid = params->nid;
601 grasshopper_init_cipher_func init_cipher = params->init_cipher;
602 int block_size = params->block_size;
603 int ctx_size = params->ctx_size;
604 int iv_size = params->iv_size;
605 bool padding = params->padding;
607 *cipher = cipher_gost_grasshopper_create(nid, block_size);
608 if (*cipher == NULL) {
612 if (!cipher_gost_grasshopper_setup(*cipher, mode, iv_size, padding) ||
613 !EVP_CIPHER_meth_set_init(*cipher, init_cipher) ||
614 !EVP_CIPHER_meth_set_impl_ctx_size(*cipher, ctx_size)) {
615 EVP_CIPHER_meth_free(*cipher);
623 const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_ecb() {
624 return cipher_gost_grasshopper(EVP_CIPH_ECB_MODE, GRASSHOPPER_CIPHER_ECB);
627 const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_cbc() {
628 return cipher_gost_grasshopper(EVP_CIPH_CBC_MODE, GRASSHOPPER_CIPHER_CBC);
631 const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_ofb() {
632 return cipher_gost_grasshopper(EVP_CIPH_OFB_MODE, GRASSHOPPER_CIPHER_OFB);
635 const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_cfb() {
636 return cipher_gost_grasshopper(EVP_CIPH_CFB_MODE, GRASSHOPPER_CIPHER_CFB);
639 const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_ctr() {
640 return cipher_gost_grasshopper(EVP_CIPH_CTR_MODE, GRASSHOPPER_CIPHER_CTR);
643 #if defined(__cplusplus)