1 /**********************************************************************
3 * Copyright (c) 2005-2006 Cryptocom LTD *
4 * This file is distributed under the same license as OpenSSL *
6 * OpenSSL interface to GOST 28147-89 cipher functions *
7 * Requires OpenSSL 0.9.9 for compilation *
8 **********************************************************************/
11 #include <openssl/err.h>
12 #include <openssl/rand.h>
13 #include "e_gost_err.h"
16 #if !defined(CCGOST_DEBUG) && !defined(DEBUG)
23 static int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
24 const unsigned char *iv, int enc);
25 static int gost_cipher_init_cbc(EVP_CIPHER_CTX *ctx, const unsigned char *key,
26 const unsigned char *iv, int enc);
27 static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
28 const unsigned char *iv, int enc);
29 static int gost_cipher_init_cp_12(EVP_CIPHER_CTX *ctx,
30 const unsigned char *key,
31 const unsigned char *iv, int enc);
32 /* Handles block of data in CFB mode */
33 static int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
34 const unsigned char *in, size_t inl);
35 /* Handles block of data in CBC mode */
36 static int gost_cipher_do_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
37 const unsigned char *in, size_t inl);
38 /* Handles block of data in CNT mode */
39 static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
40 const unsigned char *in, size_t inl);
41 /* Cleanup function */
42 static int gost_cipher_cleanup(EVP_CIPHER_CTX *);
43 /* set/get cipher parameters */
44 static int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
45 static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
46 /* Control function */
47 static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr);
49 EVP_CIPHER cipher_gost = {
54 EVP_CIPH_CFB_MODE | EVP_CIPH_NO_PADDING |
55 EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
59 sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
60 gost89_set_asn1_parameters,
61 gost89_get_asn1_parameters,
66 EVP_CIPHER cipher_gost_cbc = {
72 EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
76 sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
77 gost89_set_asn1_parameters,
78 gost89_get_asn1_parameters,
83 EVP_CIPHER cipher_gost_cpacnt = {
88 EVP_CIPH_OFB_MODE | EVP_CIPH_NO_PADDING |
89 EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
93 sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
94 gost89_set_asn1_parameters,
95 gost89_get_asn1_parameters,
100 EVP_CIPHER cipher_gost_cpcnt_12 = {
105 EVP_CIPH_OFB_MODE | EVP_CIPH_NO_PADDING |
106 EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
107 gost_cipher_init_cp_12,
110 sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
111 gost89_set_asn1_parameters,
112 gost89_get_asn1_parameters,
117 /* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */
118 /* Init functions which set specific parameters */
119 static int gost_imit_init_cpa(EVP_MD_CTX *ctx);
120 static int gost_imit_init_cp_12(EVP_MD_CTX *ctx);
121 /* process block of data */
122 static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count);
123 /* Return computed value */
124 static int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md);
126 static int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from);
127 static int gost_imit_cleanup(EVP_MD_CTX *ctx);
128 /* Control function, knows how to set MAC key.*/
129 static int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr);
131 EVP_MD imit_gost_cpa = {
132 NID_id_Gost28147_89_MAC,
145 sizeof(struct ossl_gost_imit_ctx),
149 EVP_MD imit_gost_cp_12 = {
154 gost_imit_init_cp_12,
163 sizeof(struct ossl_gost_imit_ctx),
168 * Correspondence between gost parameter OIDs and substitution blocks
169 * NID field is filed by register_gost_NID function in engine.c
170 * upon engine initialization
173 struct gost_cipher_info gost_cipher_list[] = {
180 * {NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},
182 {NID_id_Gost28147_89_CryptoPro_A_ParamSet, &Gost28147_CryptoProParamSetA,
184 {NID_id_Gost28147_89_CryptoPro_B_ParamSet, &Gost28147_CryptoProParamSetB,
186 {NID_id_Gost28147_89_CryptoPro_C_ParamSet, &Gost28147_CryptoProParamSetC,
188 {NID_id_Gost28147_89_CryptoPro_D_ParamSet, &Gost28147_CryptoProParamSetD,
190 {NID_id_tc26_gost_28147_param_Z, &Gost28147_TC26ParamSetZ, 1},
191 {NID_id_Gost28147_89_TestParamSet, &Gost28147_TestParamSet, 1},
196 * get encryption parameters from crypto network settings FIXME For now we
197 * use environment var CRYPT_PARAMS as place to store these settings.
198 * Actually, it is better to use engine control command, read from
199 * configuration file to set them
201 const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj)
204 struct gost_cipher_info *param;
206 const char *params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS);
207 if (!params || !strlen(params)) {
209 for (i = 0; gost_cipher_list[i].nid != NID_undef; i++)
210 if (gost_cipher_list[i].nid == NID_id_tc26_gost_28147_param_Z)
211 return &gost_cipher_list[i];
212 return &gost_cipher_list[0];
215 nid = OBJ_txt2nid(params);
216 if (nid == NID_undef) {
217 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,
218 GOST_R_INVALID_CIPHER_PARAM_OID);
222 nid = OBJ_obj2nid(obj);
224 for (param = gost_cipher_list; param->sblock != NULL && param->nid != nid;
226 if (!param->sblock) {
227 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, GOST_R_INVALID_CIPHER_PARAMS);
233 /* Sets cipher param from paramset NID. */
234 static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c, int nid)
236 const struct gost_cipher_info *param;
238 get_encryption_params((nid == NID_undef ? NULL : OBJ_nid2obj(nid)));
242 c->paramNID = param->nid;
243 c->key_meshing = param->key_meshing;
245 gost_init(&(c->cctx), param->sblock);
249 /* Initializes EVP_CIPHER_CTX by paramset NID */
250 static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx,
251 const unsigned char *key,
252 const unsigned char *iv, int enc,
253 int paramNID, int mode)
255 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
256 if (ctx->app_data == NULL) {
257 if (!gost_cipher_set_param(c, paramNID))
259 ctx->app_data = ctx->cipher_data;
262 gost_key(&(c->cctx), key);
264 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
265 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
269 static int gost_cipher_init_cnt(EVP_CIPHER_CTX *ctx,
270 const unsigned char *key,
271 const unsigned char *iv,
272 gost_subst_block * block)
274 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
275 gost_init(&(c->cctx), block);
279 gost_key(&(c->cctx), key);
281 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
282 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
286 static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
287 const unsigned char *iv, int enc)
289 return gost_cipher_init_cnt(ctx, key, iv, &Gost28147_CryptoProParamSetA);
292 static int gost_cipher_init_cp_12(EVP_CIPHER_CTX *ctx,
293 const unsigned char *key,
294 const unsigned char *iv, int enc)
296 return gost_cipher_init_cnt(ctx, key, iv, &Gost28147_TC26ParamSetZ);
299 /* Initializes EVP_CIPHER_CTX with default values */
300 int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
301 const unsigned char *iv, int enc)
303 return gost_cipher_init_param(ctx, key, iv, enc, NID_undef,
307 /* Initializes EVP_CIPHER_CTX with default values */
308 int gost_cipher_init_cbc(EVP_CIPHER_CTX *ctx, const unsigned char *key,
309 const unsigned char *iv, int enc)
311 return gost_cipher_init_param(ctx, key, iv, enc, NID_undef,
316 * Wrapper around gostcrypt function from gost89.c which perform key meshing
319 static void gost_crypt_mesh(void *ctx, unsigned char *iv, unsigned char *buf)
321 struct ossl_gost_cipher_ctx *c = ctx;
322 assert(c->count % 8 == 0 && c->count <= 1024);
323 if (c->key_meshing && c->count == 1024) {
324 cryptopro_key_meshing(&(c->cctx), iv);
326 gostcrypt(&(c->cctx), iv, buf);
327 c->count = c->count % 1024 + 8;
330 static void gost_cnt_next(void *ctx, unsigned char *iv, unsigned char *buf)
332 struct ossl_gost_cipher_ctx *c = ctx;
334 unsigned char buf1[8];
335 assert(c->count % 8 == 0 && c->count <= 1024);
336 if (c->key_meshing && c->count == 1024) {
337 cryptopro_key_meshing(&(c->cctx), iv);
340 gostcrypt(&(c->cctx), iv, buf1);
344 g = buf1[0] | (buf1[1] << 8) | (buf1[2] << 16) | ((word32) buf1[3] << 24);
346 buf1[0] = (unsigned char)(g & 0xff);
347 buf1[1] = (unsigned char)((g >> 8) & 0xff);
348 buf1[2] = (unsigned char)((g >> 16) & 0xff);
349 buf1[3] = (unsigned char)((g >> 24) & 0xff);
350 g = buf1[4] | (buf1[5] << 8) | (buf1[6] << 16) | ((word32) buf1[7] << 24);
353 if (go > g) /* overflow */
355 buf1[4] = (unsigned char)(g & 0xff);
356 buf1[5] = (unsigned char)((g >> 8) & 0xff);
357 buf1[6] = (unsigned char)((g >> 16) & 0xff);
358 buf1[7] = (unsigned char)((g >> 24) & 0xff);
360 gostcrypt(&(c->cctx), buf1, buf);
361 c->count = c->count % 1024 + 8;
364 /* GOST encryptoon in CBC mode */
365 int gost_cipher_do_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
366 const unsigned char *in, size_t inl)
369 const unsigned char *in_ptr = in;
370 unsigned char *out_ptr = out;
372 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
373 OPENSSL_assert(inl % 8 == 0);
376 for (i = 0; i < 8; i++) {
377 b[i] = ctx->iv[i] ^ in_ptr[i];
379 gostcrypt(&(c->cctx), b, out_ptr);
380 memcpy(ctx->iv, out_ptr, 8);
387 gostdecrypt(&(c->cctx), in_ptr, b);
388 for (i = 0; i < 8; i++) {
389 out_ptr[i] = ctx->iv[i] ^ b[i];
391 memcpy(ctx->iv, in_ptr, 8);
400 /* GOST encryption in CFB mode */
401 int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
402 const unsigned char *in, size_t inl)
404 const unsigned char *in_ptr = in;
405 unsigned char *out_ptr = out;
408 /* process partial block if any */
410 for (j = ctx->num, i = 0; j < 8 && i < inl;
411 j++, i++, in_ptr++, out_ptr++) {
413 ctx->buf[j + 8] = *in_ptr;
414 *out_ptr = ctx->buf[j] ^ (*in_ptr);
416 ctx->buf[j + 8] = *out_ptr;
419 memcpy(ctx->iv, ctx->buf + 8, 8);
427 for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
429 * block cipher current iv
431 gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
433 * xor next block of input text with it and output it
439 memcpy(ctx->iv, in_ptr, 8);
440 for (j = 0; j < 8; j++) {
441 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
444 /* Next iv is next block of cipher text */
446 memcpy(ctx->iv, out_ptr, 8);
448 /* Process rest of buffer */
450 gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
452 memcpy(ctx->buf + 8, in_ptr, inl - i);
453 for (j = 0; i < inl; j++, i++) {
454 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
458 memcpy(ctx->buf + 8, out_ptr, j);
465 static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
466 const unsigned char *in, size_t inl)
468 const unsigned char *in_ptr = in;
469 unsigned char *out_ptr = out;
472 /* process partial block if any */
474 for (j = ctx->num, i = 0; j < 8 && i < inl;
475 j++, i++, in_ptr++, out_ptr++) {
476 *out_ptr = ctx->buf[j] ^ (*in_ptr);
486 for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
488 * block cipher current iv
491 gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
493 * xor next block of input text with it and output it
498 for (j = 0; j < 8; j++) {
499 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
502 /* Process rest of buffer */
504 gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
505 for (j = 0; i < inl; j++, i++) {
506 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
515 /* Cleaning up of EVP_CIPHER_CTX */
516 int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
518 gost_destroy(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx);
519 ctx->app_data = NULL;
523 /* Control function for gost cipher */
524 int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
529 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
533 return gost_cipher_set_param(c, arg);
535 case EVP_CTRL_RAND_KEY:
537 if (RAND_bytes((unsigned char *)ptr, ctx->key_len) <= 0) {
538 GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_RNG_ERROR);
543 case EVP_CTRL_PBE_PRF_NID:
545 const char *params = get_gost_engine_param(GOST_PARAM_PBE_PARAMS);
546 int nid = NID_id_tc26_hmac_gost_3411_2012_512;
549 if (!strcmp("md_gost12_256", params))
550 nid = NID_id_tc26_hmac_gost_3411_2012_256;
551 else if (!strcmp("md_gost12_512", params))
552 nid = NID_id_tc26_hmac_gost_3411_2012_512;
553 else if (!strcmp("md_gost94", params))
554 nid = NID_id_HMACGostR3411_94;
563 GOSTerr(GOST_F_GOST_CIPHER_CTL,
564 GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
570 /* Set cipher parameters from ASN1 structure */
571 int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
574 unsigned char *buf = NULL;
575 unsigned char *p = NULL;
576 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
577 GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();
578 ASN1_OCTET_STRING *os = NULL;
580 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
583 if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len)) {
584 GOST_CIPHER_PARAMS_free(gcp);
585 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
588 ASN1_OBJECT_free(gcp->enc_param_set);
589 gcp->enc_param_set = OBJ_nid2obj(c->paramNID);
591 len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);
592 p = buf = OPENSSL_malloc(len);
594 GOST_CIPHER_PARAMS_free(gcp);
595 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
598 i2d_GOST_CIPHER_PARAMS(gcp, &p);
599 GOST_CIPHER_PARAMS_free(gcp);
601 os = ASN1_OCTET_STRING_new();
603 if (!os || !ASN1_OCTET_STRING_set(os, buf, len)) {
605 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
610 ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
614 /* Store parameters into ASN1 structure */
615 int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
619 GOST_CIPHER_PARAMS *gcp = NULL;
621 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
624 if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) {
628 p = params->value.sequence->data;
630 gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p,
631 params->value.sequence->length);
633 len = gcp->iv->length;
634 if (len != ctx->cipher->iv_len) {
635 GOST_CIPHER_PARAMS_free(gcp);
636 GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS, GOST_R_INVALID_IV_LENGTH);
640 nid = OBJ_obj2nid(gcp->enc_param_set);
641 if (nid == NID_undef) {
642 GOST_CIPHER_PARAMS_free(gcp);
643 GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS,
644 GOST_R_INVALID_CIPHER_PARAM_OID);
648 if (!gost_cipher_set_param(c, nid)) {
649 GOST_CIPHER_PARAMS_free(gcp);
655 ASN1_TYPE_set(&tmp, V_ASN1_OCTET_STRING, gcp->iv);
656 EVP_CIPHER_get_asn1_iv(ctx, &tmp);
659 GOST_CIPHER_PARAMS_free(gcp);
664 static int gost_imit_init(EVP_MD_CTX *ctx, gost_subst_block * block)
666 struct ossl_gost_imit_ctx *c = ctx->md_data;
667 memset(c->buffer, 0, sizeof(c->buffer));
668 memset(c->partial_block, 0, sizeof(c->partial_block));
673 gost_init(&(c->cctx), block);
677 static int gost_imit_init_cpa(EVP_MD_CTX *ctx)
679 return gost_imit_init(ctx, &Gost28147_CryptoProParamSetA);
682 static int gost_imit_init_cp_12(EVP_MD_CTX *ctx)
684 return gost_imit_init(ctx, &Gost28147_TC26ParamSetZ);
687 static void mac_block_mesh(struct ossl_gost_imit_ctx *c,
688 const unsigned char *data)
690 unsigned char buffer[8];
692 * We are using local buffer for iv because CryptoPro doesn't interpret
693 * internal state of MAC algorithm as iv during keymeshing (but does
694 * initialize internal state from iv in key transport
696 assert(c->count % 8 == 0 && c->count <= 1024);
697 if (c->key_meshing && c->count == 1024) {
698 cryptopro_key_meshing(&(c->cctx), buffer);
700 mac_block(&(c->cctx), c->buffer, data);
701 c->count = c->count % 1024 + 8;
704 int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count)
706 struct ossl_gost_imit_ctx *c = ctx->md_data;
707 const unsigned char *p = data;
708 size_t bytes = count, i;
710 GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET);
714 for (i = c->bytes_left; i < 8 && bytes > 0; bytes--, i++, p++) {
715 c->partial_block[i] = *p;
718 mac_block_mesh(c, c->partial_block);
725 mac_block_mesh(c, p);
730 memcpy(c->partial_block, p, bytes);
732 c->bytes_left = bytes;
736 int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md)
738 struct ossl_gost_imit_ctx *c = ctx->md_data;
740 GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET);
743 if (c->count == 0 && c->bytes_left) {
744 unsigned char buffer[8];
745 memset(buffer, 0, 8);
746 gost_imit_update(ctx, buffer, 8);
750 for (i = c->bytes_left; i < 8; i++) {
751 c->partial_block[i] = 0;
753 mac_block_mesh(c, c->partial_block);
755 get_mac(c->buffer, 8 * c->dgst_size, md);
759 int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr)
762 case EVP_MD_CTRL_KEY_LEN:
763 *((unsigned int *)(ptr)) = 32;
765 case EVP_MD_CTRL_SET_KEY:
767 struct ossl_gost_imit_ctx *gost_imit_ctx = ctx->md_data;
769 if (ctx->digest->init(ctx) <= 0) {
770 GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_MAC_KEY_NOT_SET);
773 ctx->flags |= EVP_MD_CTX_FLAG_NO_INIT;
776 struct gost_mac_key *key = (struct gost_mac_key *)ptr;
777 if (key->mac_param_nid != NID_undef) {
778 const struct gost_cipher_info *param =
779 get_encryption_params(OBJ_nid2obj
780 (key->mac_param_nid));
782 GOSTerr(GOST_F_GOST_IMIT_CTRL,
783 GOST_R_INVALID_MAC_PARAMS);
786 gost_init(&(gost_imit_ctx->cctx), param->sblock);
788 gost_key(&(gost_imit_ctx->cctx), key->key);
789 gost_imit_ctx->key_set = 1;
792 } else if (arg == 32) {
793 gost_key(&(gost_imit_ctx->cctx), ptr);
794 gost_imit_ctx->key_set = 1;
797 GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_SIZE);
800 case EVP_MD_CTRL_MAC_LEN:
802 struct ossl_gost_imit_ctx *c = ctx->md_data;
803 if (arg < 1 || arg > 8) {
804 GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_SIZE);
816 int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
818 memcpy(to->md_data, from->md_data, sizeof(struct ossl_gost_imit_ctx));
822 /* Clean up imit ctx */
823 int gost_imit_cleanup(EVP_MD_CTX *ctx)
825 memset(ctx->md_data, 0, sizeof(struct ossl_gost_imit_ctx));