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_ctr),
105 /* Set 256 bit key into context */
106 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 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);
143 int gost_grasshopper_cipher_init(EVP_CIPHER_CTX* ctx, const unsigned char* key,
144 const unsigned char* iv, int enc) {
145 gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
147 if (EVP_CIPHER_CTX_get_app_data(ctx) == NULL) {
148 EVP_CIPHER_CTX_set_app_data(ctx, EVP_CIPHER_CTX_get_cipher_data(ctx));
152 gost_grasshopper_cipher_key(c, key);
156 memcpy((unsigned char*) EVP_CIPHER_CTX_original_iv(ctx), iv,
157 EVP_CIPHER_CTX_iv_length(ctx));
160 memcpy(EVP_CIPHER_CTX_iv_noconst(ctx),
161 EVP_CIPHER_CTX_original_iv(ctx),
162 EVP_CIPHER_CTX_iv_length(ctx));
164 grasshopper_zero128(&c->buffer);
169 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ecb(EVP_CIPHER_CTX* ctx, const unsigned char* key,
170 const unsigned char* iv,
172 gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
173 c->type = GRASSHOPPER_CIPHER_ECB;
174 return gost_grasshopper_cipher_init(ctx, key, iv, enc);
177 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_cbc(EVP_CIPHER_CTX* ctx, const unsigned char* key,
178 const unsigned char* iv,
180 gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
181 c->type = GRASSHOPPER_CIPHER_CBC;
182 return gost_grasshopper_cipher_init(ctx, key, iv, enc);
185 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ofb(EVP_CIPHER_CTX* ctx, const unsigned char* key,
186 const unsigned char* iv,
188 gost_grasshopper_cipher_ctx_ofb* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
190 c->c.type = GRASSHOPPER_CIPHER_OFB;
192 grasshopper_zero128(&c->buffer1);
194 return gost_grasshopper_cipher_init(ctx, key, iv, enc);
197 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_cfb(EVP_CIPHER_CTX* ctx, const unsigned char* key,
198 const unsigned char* iv,
200 gost_grasshopper_cipher_ctx* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
201 c->type = GRASSHOPPER_CIPHER_CFB;
202 return gost_grasshopper_cipher_init(ctx, key, iv, enc);
205 GRASSHOPPER_INLINE int gost_grasshopper_cipher_init_ctr(EVP_CIPHER_CTX* ctx, const unsigned char* key,
206 const unsigned char* iv,
208 gost_grasshopper_cipher_ctx_ctr* c = EVP_CIPHER_CTX_get_cipher_data(ctx);
210 c->c.type = GRASSHOPPER_CIPHER_CTR;
211 EVP_CIPHER_CTX_set_num(ctx, 0);
213 grasshopper_zero128(&c->iv_buffer);
214 grasshopper_zero128(&c->partial_buffer);
216 return gost_grasshopper_cipher_init(ctx, key, iv, enc);
219 GRASSHOPPER_INLINE int gost_grasshopper_cipher_do(EVP_CIPHER_CTX* ctx, unsigned char* out,
220 const unsigned char* in, size_t inl) {
221 gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_get_cipher_data(ctx);
222 struct GRASSHOPPER_CIPHER_PARAMS* params = &gost_cipher_params[c->type];
224 return params->do_cipher(ctx, out, in, inl);
227 int gost_grasshopper_cipher_do_ecb(EVP_CIPHER_CTX* ctx, unsigned char* out,
228 const unsigned char* in, size_t inl) {
229 gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_get_cipher_data(ctx);
230 bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
231 const unsigned char* current_in = in;
232 unsigned char* current_out = out;
233 size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
236 for (i = 0; i < blocks; i++, current_in += GRASSHOPPER_BLOCK_SIZE, current_out += GRASSHOPPER_BLOCK_SIZE) {
238 grasshopper_encrypt_block(&c->encrypt_round_keys, (grasshopper_w128_t*) current_in,
239 (grasshopper_w128_t*) current_out,
242 grasshopper_decrypt_block(&c->decrypt_round_keys, (grasshopper_w128_t*) current_in,
243 (grasshopper_w128_t*) current_out,
251 int gost_grasshopper_cipher_do_cbc(EVP_CIPHER_CTX* ctx, unsigned char* out,
252 const unsigned char* in, size_t inl) {
253 gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_get_cipher_data(ctx);
254 unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
255 bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
256 const unsigned char* current_in = in;
257 unsigned char* current_out = out;
258 grasshopper_w128_t* currentInputBlock;
259 grasshopper_w128_t* currentOutputBlock;
260 size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
262 grasshopper_w128_t* currentBlock;
264 currentBlock = (grasshopper_w128_t*) iv;
266 for (i = 0; i < blocks; i++, current_in += GRASSHOPPER_BLOCK_SIZE, current_out += GRASSHOPPER_BLOCK_SIZE) {
267 currentInputBlock = (grasshopper_w128_t*) current_in;
268 currentOutputBlock = (grasshopper_w128_t*) current_out;
270 grasshopper_append128(currentBlock, currentInputBlock);
271 grasshopper_encrypt_block(&c->encrypt_round_keys, currentBlock, currentOutputBlock, &c->buffer);
272 grasshopper_copy128(currentBlock, currentOutputBlock);
274 grasshopper_decrypt_block(&c->decrypt_round_keys, currentInputBlock, currentOutputBlock, &c->buffer);
275 grasshopper_append128(currentOutputBlock, currentBlock);
276 grasshopper_copy128(currentBlock, currentInputBlock);
283 /* increment counter (128-bit int) by 1 */
284 static void ctr128_inc(unsigned char *counter)
298 int gost_grasshopper_cipher_do_ctr(EVP_CIPHER_CTX* ctx, unsigned char* out,
299 const unsigned char* in, size_t inl) {
300 gost_grasshopper_cipher_ctx_ctr* c = (gost_grasshopper_cipher_ctx_ctr*) EVP_CIPHER_CTX_get_cipher_data(ctx);
301 unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
302 const unsigned char* current_in = in;
303 unsigned char* current_out = out;
304 grasshopper_w128_t* currentInputBlock;
305 grasshopper_w128_t* currentOutputBlock;
306 unsigned int n = EVP_CIPHER_CTX_num(ctx);
311 *(current_out++) = *(current_in++) ^ c->partial_buffer.b[n];
313 n = (n + 1) % GRASSHOPPER_BLOCK_SIZE;
315 EVP_CIPHER_CTX_set_num(ctx, n);
316 size_t blocks = inl / GRASSHOPPER_BLOCK_SIZE;
318 memcpy(&c->iv_buffer, iv, 8);
321 for (i = 0; i < blocks; i++) {
322 currentInputBlock = (grasshopper_w128_t*) current_in;
323 currentOutputBlock = (grasshopper_w128_t*) current_out;
324 grasshopper_encrypt_block(&c->c.encrypt_round_keys, &c->iv_buffer, currentOutputBlock, &c->c.buffer);
325 grasshopper_append128(currentOutputBlock, currentInputBlock);
326 ctr128_inc(c->iv_buffer.b);
327 current_in += GRASSHOPPER_BLOCK_SIZE;
328 current_out += GRASSHOPPER_BLOCK_SIZE;
332 lasted = inl - blocks * GRASSHOPPER_BLOCK_SIZE;
334 currentInputBlock = (grasshopper_w128_t*) current_in;
335 currentOutputBlock = (grasshopper_w128_t*) current_out;
336 grasshopper_encrypt_block(&c->c.encrypt_round_keys, &c->iv_buffer, &c->partial_buffer, &c->c.buffer);
337 for (i = 0; i < lasted; i++) {
338 currentOutputBlock->b[i] = c->partial_buffer.b[i] ^ currentInputBlock->b[i];
340 EVP_CIPHER_CTX_set_num(ctx, i);
341 ctr128_inc(c->iv_buffer.b);
347 static void gost_grasshopper_cnt_next(gost_grasshopper_cipher_ctx_ofb* ctx, grasshopper_w128_t* iv,
348 grasshopper_w128_t* buf) {
349 memcpy(&ctx->buffer1, iv, 16);
350 ctx->g = ctx->buffer1.b[0] | (ctx->buffer1.b[1] << 8) | (ctx->buffer1.b[2] << 16) |
351 ((uint32_t) ctx->buffer1.b[3] << 24);
352 ctx->g += 0x01010101;
353 ctx->buffer1.b[0] = (unsigned char) (ctx->g & 0xff);
354 ctx->buffer1.b[1] = (unsigned char) ((ctx->g >> 8) & 0xff);
355 ctx->buffer1.b[2] = (unsigned char) ((ctx->g >> 16) & 0xff);
356 ctx->buffer1.b[3] = (unsigned char) ((ctx->g >> 24) & 0xff);
357 ctx->g = ctx->buffer1.b[4] | (ctx->buffer1.b[5] << 8) | (ctx->buffer1.b[6] << 16) |
358 ((uint32_t) ctx->buffer1.b[7] << 24);
360 ctx->g += 0x01010104;
361 if (ctx->go > ctx->g) { /* overflow */
364 ctx->buffer1.b[4] = (unsigned char) (ctx->g & 0xff);
365 ctx->buffer1.b[5] = (unsigned char) ((ctx->g >> 8) & 0xff);
366 ctx->buffer1.b[6] = (unsigned char) ((ctx->g >> 16) & 0xff);
367 ctx->buffer1.b[7] = (unsigned char) ((ctx->g >> 24) & 0xff);
368 ctx->g = ctx->buffer1.b[8] | (ctx->buffer1.b[9] << 8) | (ctx->buffer1.b[10] << 16) |
369 ((uint32_t) ctx->buffer1.b[11] << 24);
371 ctx->g += 0x01010107;
372 if (ctx->go > ctx->g) { /* overflow */
375 ctx->buffer1.b[8] = (unsigned char) (ctx->g & 0xff);
376 ctx->buffer1.b[9] = (unsigned char) ((ctx->g >> 8) & 0xff);
377 ctx->buffer1.b[10] = (unsigned char) ((ctx->g >> 16) & 0xff);
378 ctx->buffer1.b[11] = (unsigned char) ((ctx->g >> 24) & 0xff);
379 ctx->g = ctx->buffer1.b[12] | (ctx->buffer1.b[13] << 8) | (ctx->buffer1.b[14] << 16) |
380 ((uint32_t) ctx->buffer1.b[15] << 24);
382 ctx->g += 0x01010110;
383 if (ctx->go > ctx->g) { /* overflow */
386 ctx->buffer1.b[12] = (unsigned char) (ctx->g & 0xff);
387 ctx->buffer1.b[13] = (unsigned char) ((ctx->g >> 8) & 0xff);
388 ctx->buffer1.b[14] = (unsigned char) ((ctx->g >> 16) & 0xff);
389 ctx->buffer1.b[15] = (unsigned char) ((ctx->g >> 24) & 0xff);
390 memcpy(iv, &ctx->buffer1, 16);
391 grasshopper_encrypt_block(&ctx->c.encrypt_round_keys, &ctx->buffer1, buf, &ctx->c.buffer);
394 int gost_grasshopper_cipher_do_ofb(EVP_CIPHER_CTX* ctx, unsigned char* out,
395 const unsigned char* in, size_t inl) {
396 gost_grasshopper_cipher_ctx_ofb* c = (gost_grasshopper_cipher_ctx_ofb*) EVP_CIPHER_CTX_get_cipher_data(ctx);
397 const unsigned char* in_ptr = in;
398 unsigned char* out_ptr = out;
399 unsigned char* buf = EVP_CIPHER_CTX_buf_noconst(ctx);
400 unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
401 int num = EVP_CIPHER_CTX_num(ctx);
405 /* process partial block if any */
407 for (j = (size_t) num, i = 0; j < GRASSHOPPER_BLOCK_SIZE && i < inl;
408 j++, i++, in_ptr++, out_ptr++) {
409 *out_ptr = buf[j] ^ (*in_ptr);
411 if (j == GRASSHOPPER_BLOCK_SIZE) {
412 EVP_CIPHER_CTX_set_num(ctx, 0);
414 EVP_CIPHER_CTX_set_num(ctx, (int) j);
419 for (; i + GRASSHOPPER_BLOCK_SIZE <
420 inl; i += GRASSHOPPER_BLOCK_SIZE, in_ptr += GRASSHOPPER_BLOCK_SIZE, out_ptr += GRASSHOPPER_BLOCK_SIZE) {
422 * block cipher current iv
425 gost_grasshopper_cnt_next(c, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf);
428 * xor next block of input text with it and output it
433 for (j = 0; j < GRASSHOPPER_BLOCK_SIZE; j++) {
434 out_ptr[j] = buf[j] ^ in_ptr[j];
438 /* Process rest of buffer */
440 gost_grasshopper_cnt_next(c, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf);
441 for (j = 0; i < inl; j++, i++) {
442 out_ptr[j] = buf[j] ^ in_ptr[j];
444 EVP_CIPHER_CTX_set_num(ctx, (int) j);
446 EVP_CIPHER_CTX_set_num(ctx, 0);
452 int gost_grasshopper_cipher_do_cfb(EVP_CIPHER_CTX* ctx, unsigned char* out,
453 const unsigned char* in, size_t inl) {
454 gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_get_cipher_data(ctx);
455 const unsigned char* in_ptr = in;
456 unsigned char* out_ptr = out;
457 unsigned char* buf = EVP_CIPHER_CTX_buf_noconst(ctx);
458 unsigned char* iv = EVP_CIPHER_CTX_iv_noconst(ctx);
459 bool encrypting = (bool) EVP_CIPHER_CTX_encrypting(ctx);
460 int num = EVP_CIPHER_CTX_num(ctx);
464 /* process partial block if any */
466 for (j = (size_t) num, i = 0; j < GRASSHOPPER_BLOCK_SIZE && i < inl; j++, i++, in_ptr++, out_ptr++) {
468 buf[j + GRASSHOPPER_BLOCK_SIZE] = *in_ptr;
470 *out_ptr = buf[j] ^ (*in_ptr);
472 buf[j + GRASSHOPPER_BLOCK_SIZE] = *out_ptr;
475 if (j == GRASSHOPPER_BLOCK_SIZE) {
476 memcpy(iv, buf + GRASSHOPPER_BLOCK_SIZE, GRASSHOPPER_BLOCK_SIZE);
477 EVP_CIPHER_CTX_set_num(ctx, 0);
479 EVP_CIPHER_CTX_set_num(ctx, (int) j);
484 for (; i + GRASSHOPPER_BLOCK_SIZE <
485 inl; i += GRASSHOPPER_BLOCK_SIZE, in_ptr += GRASSHOPPER_BLOCK_SIZE, out_ptr += GRASSHOPPER_BLOCK_SIZE) {
487 * block cipher current iv
489 grasshopper_encrypt_block(&c->encrypt_round_keys, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf,
492 * xor next block of input text with it and output it
498 memcpy(iv, in_ptr, GRASSHOPPER_BLOCK_SIZE);
500 for (j = 0; j < GRASSHOPPER_BLOCK_SIZE; j++) {
501 out_ptr[j] = buf[j] ^ in_ptr[j];
504 /* Next iv is next block of cipher text */
506 memcpy(iv, out_ptr, GRASSHOPPER_BLOCK_SIZE);
510 /* Process rest of buffer */
512 grasshopper_encrypt_block(&c->encrypt_round_keys, (grasshopper_w128_t*) iv, (grasshopper_w128_t*) buf,
515 memcpy(buf + GRASSHOPPER_BLOCK_SIZE, in_ptr, inl - i);
517 for (j = 0; i < inl; j++, i++) {
518 out_ptr[j] = buf[j] ^ in_ptr[j];
520 EVP_CIPHER_CTX_set_num(ctx, (int) j);
522 memcpy(buf + GRASSHOPPER_BLOCK_SIZE, out_ptr, j);
525 EVP_CIPHER_CTX_set_num(ctx, 0);
531 int gost_grasshopper_cipher_cleanup(EVP_CIPHER_CTX* ctx) {
532 gost_grasshopper_cipher_ctx* c = (gost_grasshopper_cipher_ctx*) EVP_CIPHER_CTX_get_cipher_data(ctx);
533 struct GRASSHOPPER_CIPHER_PARAMS* params = &gost_cipher_params[c->type];
535 gost_grasshopper_cipher_destroy(c);
536 if (params->destroy_cipher != NULL) {
537 params->destroy_cipher(c);
540 EVP_CIPHER_CTX_set_app_data(ctx, NULL);
545 int gost_grasshopper_set_asn1_parameters(EVP_CIPHER_CTX* ctx, ASN1_TYPE* params) {
547 unsigned char* buf = NULL;
548 ASN1_OCTET_STRING* os = NULL;
550 os = ASN1_OCTET_STRING_new();
552 if (!os || !ASN1_OCTET_STRING_set(os, buf, len)) {
554 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
559 ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
563 GRASSHOPPER_INLINE int gost_grasshopper_get_asn1_parameters(EVP_CIPHER_CTX* ctx, ASN1_TYPE* params) {
566 if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) {
573 int gost_grasshopper_cipher_ctl(EVP_CIPHER_CTX* ctx, int type, int arg, void* ptr) {
575 case EVP_CTRL_RAND_KEY: {
576 if (RAND_bytes((unsigned char*) ptr, EVP_CIPHER_CTX_key_length(ctx)) <= 0) {
577 GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_RNG_ERROR);
583 GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
589 GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_create(int cipher_type, int block_size) {
590 return EVP_CIPHER_meth_new(cipher_type,
591 block_size /* block_size */,
592 GRASSHOPPER_KEY_SIZE /* key_size */);
595 const int cipher_gost_grasshopper_setup(EVP_CIPHER* cipher, uint8_t mode, int iv_size, bool padding) {
596 return EVP_CIPHER_meth_set_iv_length(cipher, iv_size) &&
597 EVP_CIPHER_meth_set_flags(cipher, (unsigned long) (
599 ((!padding) ? EVP_CIPH_NO_PADDING : 0) |
600 ((iv_size > 0) ? EVP_CIPH_CUSTOM_IV : 0) |
602 EVP_CIPH_ALWAYS_CALL_INIT)
604 EVP_CIPHER_meth_set_cleanup(cipher, gost_grasshopper_cipher_cleanup) &&
605 EVP_CIPHER_meth_set_set_asn1_params(cipher, gost_grasshopper_set_asn1_parameters) &&
606 EVP_CIPHER_meth_set_get_asn1_params(cipher, gost_grasshopper_get_asn1_parameters) &&
607 EVP_CIPHER_meth_set_ctrl(cipher, gost_grasshopper_cipher_ctl) &&
608 EVP_CIPHER_meth_set_do_cipher(cipher, gost_grasshopper_cipher_do);
611 const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper(uint8_t mode, uint8_t num) {
613 struct GRASSHOPPER_CIPHER_PARAMS* params;
615 cipher = &gost_grasshopper_ciphers[num];
617 if (*cipher == NULL) {
618 params = &gost_cipher_params[num];
620 int nid = params->nid;
621 grasshopper_init_cipher_func init_cipher = params->init_cipher;
622 int block_size = params->block_size;
623 int ctx_size = params->ctx_size;
624 int iv_size = params->iv_size;
625 bool padding = params->padding;
627 *cipher = cipher_gost_grasshopper_create(nid, block_size);
628 if (*cipher == NULL) {
632 if (!cipher_gost_grasshopper_setup(*cipher, mode, iv_size, padding) ||
633 !EVP_CIPHER_meth_set_init(*cipher, init_cipher) ||
634 !EVP_CIPHER_meth_set_impl_ctx_size(*cipher, ctx_size)) {
635 EVP_CIPHER_meth_free(*cipher);
643 const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_ecb() {
644 return cipher_gost_grasshopper(EVP_CIPH_ECB_MODE, GRASSHOPPER_CIPHER_ECB);
647 const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_cbc() {
648 return cipher_gost_grasshopper(EVP_CIPH_CBC_MODE, GRASSHOPPER_CIPHER_CBC);
651 const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_ofb() {
652 return cipher_gost_grasshopper(EVP_CIPH_OFB_MODE, GRASSHOPPER_CIPHER_OFB);
655 const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_cfb() {
656 return cipher_gost_grasshopper(EVP_CIPH_CFB_MODE, GRASSHOPPER_CIPHER_CFB);
659 const GRASSHOPPER_INLINE EVP_CIPHER* cipher_gost_grasshopper_ctr() {
660 return cipher_gost_grasshopper(EVP_CIPH_CTR_MODE, GRASSHOPPER_CIPHER_CTR);
663 #if defined(__cplusplus)