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 static EVP_MD *_hidden_Gost28147_89_MAC_md = NULL;
132 static EVP_MD *_hidden_Gost28147_89_12_MAC_md = NULL;
134 EVP_MD *imit_gost_cpa(void)
136 if (_hidden_Gost28147_89_MAC_md == NULL) {
139 if ((md = EVP_MD_meth_new(NID_id_Gost28147_89_MAC, NID_undef)) == NULL
140 || !EVP_MD_meth_set_result_size(md, 4)
141 || !EVP_MD_meth_set_input_blocksize(md, 8)
142 || !EVP_MD_meth_set_app_datasize(md,
143 sizeof(struct ossl_gost_imit_ctx))
144 || !EVP_MD_meth_set_flags(md, 0)
145 || !EVP_MD_meth_set_init(md, gost_imit_init_cpa)
146 || !EVP_MD_meth_set_update(md, gost_imit_update)
147 || !EVP_MD_meth_set_final(md, gost_imit_final)
148 || !EVP_MD_meth_set_copy(md, gost_imit_copy)
149 || !EVP_MD_meth_set_cleanup(md, gost_imit_cleanup)
150 || !EVP_MD_meth_set_ctrl(md, gost_imit_ctrl)) {
151 EVP_MD_meth_free(md);
154 _hidden_Gost28147_89_MAC_md = md;
156 return _hidden_Gost28147_89_MAC_md;
159 void imit_gost_cpa_destroy(void)
161 EVP_MD_meth_free(_hidden_Gost28147_89_MAC_md);
162 _hidden_Gost28147_89_MAC_md = NULL;
165 EVP_MD *imit_gost_cp_12(void)
167 if (_hidden_Gost28147_89_12_MAC_md == NULL) {
170 if ((md = EVP_MD_meth_new(NID_gost_mac_12, NID_undef)) == NULL
171 || !EVP_MD_meth_set_result_size(md, 4)
172 || !EVP_MD_meth_set_input_blocksize(md, 8)
173 || !EVP_MD_meth_set_app_datasize(md,
174 sizeof(struct ossl_gost_imit_ctx))
175 || !EVP_MD_meth_set_flags(md, 0)
176 || !EVP_MD_meth_set_init(md, gost_imit_init_cp_12)
177 || !EVP_MD_meth_set_update(md, gost_imit_update)
178 || !EVP_MD_meth_set_final(md, gost_imit_final)
179 || !EVP_MD_meth_set_copy(md, gost_imit_copy)
180 || !EVP_MD_meth_set_cleanup(md, gost_imit_cleanup)
181 || !EVP_MD_meth_set_ctrl(md, gost_imit_ctrl)) {
182 EVP_MD_meth_free(md);
185 _hidden_Gost28147_89_12_MAC_md = md;
187 return _hidden_Gost28147_89_12_MAC_md;
190 void imit_gost_cp_12_destroy(void)
192 EVP_MD_meth_free(_hidden_Gost28147_89_12_MAC_md);
193 _hidden_Gost28147_89_12_MAC_md = NULL;
197 * Correspondence between gost parameter OIDs and substitution blocks
198 * NID field is filed by register_gost_NID function in engine.c
199 * upon engine initialization
202 struct gost_cipher_info gost_cipher_list[] = {
209 * {NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},
211 {NID_id_Gost28147_89_CryptoPro_A_ParamSet, &Gost28147_CryptoProParamSetA,
213 {NID_id_Gost28147_89_CryptoPro_B_ParamSet, &Gost28147_CryptoProParamSetB,
215 {NID_id_Gost28147_89_CryptoPro_C_ParamSet, &Gost28147_CryptoProParamSetC,
217 {NID_id_Gost28147_89_CryptoPro_D_ParamSet, &Gost28147_CryptoProParamSetD,
219 {NID_id_tc26_gost_28147_param_Z, &Gost28147_TC26ParamSetZ, 1},
220 {NID_id_Gost28147_89_TestParamSet, &Gost28147_TestParamSet, 1},
225 * get encryption parameters from crypto network settings FIXME For now we
226 * use environment var CRYPT_PARAMS as place to store these settings.
227 * Actually, it is better to use engine control command, read from
228 * configuration file to set them
230 const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj)
233 struct gost_cipher_info *param;
235 const char *params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS);
236 if (!params || !strlen(params)) {
238 for (i = 0; gost_cipher_list[i].nid != NID_undef; i++)
239 if (gost_cipher_list[i].nid == NID_id_tc26_gost_28147_param_Z)
240 return &gost_cipher_list[i];
241 return &gost_cipher_list[0];
244 nid = OBJ_txt2nid(params);
245 if (nid == NID_undef) {
246 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,
247 GOST_R_INVALID_CIPHER_PARAM_OID);
251 nid = OBJ_obj2nid(obj);
253 for (param = gost_cipher_list; param->sblock != NULL && param->nid != nid;
255 if (!param->sblock) {
256 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, GOST_R_INVALID_CIPHER_PARAMS);
262 /* Sets cipher param from paramset NID. */
263 static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c, int nid)
265 const struct gost_cipher_info *param;
267 get_encryption_params((nid == NID_undef ? NULL : OBJ_nid2obj(nid)));
271 c->paramNID = param->nid;
272 c->key_meshing = param->key_meshing;
274 gost_init(&(c->cctx), param->sblock);
278 /* Initializes EVP_CIPHER_CTX by paramset NID */
279 static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx,
280 const unsigned char *key,
281 const unsigned char *iv, int enc,
282 int paramNID, int mode)
284 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
285 if (ctx->app_data == NULL) {
286 if (!gost_cipher_set_param(c, paramNID))
288 ctx->app_data = ctx->cipher_data;
291 gost_key(&(c->cctx), key);
293 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
294 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
298 static int gost_cipher_init_cnt(EVP_CIPHER_CTX *ctx,
299 const unsigned char *key,
300 const unsigned char *iv,
301 gost_subst_block * block)
303 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
304 gost_init(&(c->cctx), block);
308 gost_key(&(c->cctx), key);
310 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
311 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
315 static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
316 const unsigned char *iv, int enc)
318 return gost_cipher_init_cnt(ctx, key, iv, &Gost28147_CryptoProParamSetA);
321 static int gost_cipher_init_cp_12(EVP_CIPHER_CTX *ctx,
322 const unsigned char *key,
323 const unsigned char *iv, int enc)
325 return gost_cipher_init_cnt(ctx, key, iv, &Gost28147_TC26ParamSetZ);
328 /* Initializes EVP_CIPHER_CTX with default values */
329 int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
330 const unsigned char *iv, int enc)
332 return gost_cipher_init_param(ctx, key, iv, enc, NID_undef,
336 /* Initializes EVP_CIPHER_CTX with default values */
337 int gost_cipher_init_cbc(EVP_CIPHER_CTX *ctx, const unsigned char *key,
338 const unsigned char *iv, int enc)
340 return gost_cipher_init_param(ctx, key, iv, enc, NID_undef,
345 * Wrapper around gostcrypt function from gost89.c which perform key meshing
348 static void gost_crypt_mesh(void *ctx, unsigned char *iv, unsigned char *buf)
350 struct ossl_gost_cipher_ctx *c = ctx;
351 assert(c->count % 8 == 0 && c->count <= 1024);
352 if (c->key_meshing && c->count == 1024) {
353 cryptopro_key_meshing(&(c->cctx), iv);
355 gostcrypt(&(c->cctx), iv, buf);
356 c->count = c->count % 1024 + 8;
359 static void gost_cnt_next(void *ctx, unsigned char *iv, unsigned char *buf)
361 struct ossl_gost_cipher_ctx *c = ctx;
363 unsigned char buf1[8];
364 assert(c->count % 8 == 0 && c->count <= 1024);
365 if (c->key_meshing && c->count == 1024) {
366 cryptopro_key_meshing(&(c->cctx), iv);
369 gostcrypt(&(c->cctx), iv, buf1);
373 g = buf1[0] | (buf1[1] << 8) | (buf1[2] << 16) | ((word32) buf1[3] << 24);
375 buf1[0] = (unsigned char)(g & 0xff);
376 buf1[1] = (unsigned char)((g >> 8) & 0xff);
377 buf1[2] = (unsigned char)((g >> 16) & 0xff);
378 buf1[3] = (unsigned char)((g >> 24) & 0xff);
379 g = buf1[4] | (buf1[5] << 8) | (buf1[6] << 16) | ((word32) buf1[7] << 24);
382 if (go > g) /* overflow */
384 buf1[4] = (unsigned char)(g & 0xff);
385 buf1[5] = (unsigned char)((g >> 8) & 0xff);
386 buf1[6] = (unsigned char)((g >> 16) & 0xff);
387 buf1[7] = (unsigned char)((g >> 24) & 0xff);
389 gostcrypt(&(c->cctx), buf1, buf);
390 c->count = c->count % 1024 + 8;
393 /* GOST encryptoon in CBC mode */
394 int gost_cipher_do_cbc(EVP_CIPHER_CTX *ctx, unsigned char *out,
395 const unsigned char *in, size_t inl)
397 OPENSSL_assert(inl % 8 == 0);
399 const unsigned char *in_ptr = in;
400 unsigned char *out_ptr = out;
402 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
405 for (i = 0; i < 8; i++) {
406 b[i] = ctx->iv[i] ^ in_ptr[i];
408 gostcrypt(&(c->cctx), b, out_ptr);
409 memcpy(ctx->iv, out_ptr, 8);
416 gostdecrypt(&(c->cctx), in_ptr, b);
417 for (i = 0; i < 8; i++) {
418 out_ptr[i] = ctx->iv[i] ^ b[i];
420 memcpy(ctx->iv, in_ptr, 8);
429 /* GOST encryption in CFB mode */
430 int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
431 const unsigned char *in, size_t inl)
433 const unsigned char *in_ptr = in;
434 unsigned char *out_ptr = out;
437 /* process partial block if any */
439 for (j = ctx->num, i = 0; j < 8 && i < inl;
440 j++, i++, in_ptr++, out_ptr++) {
442 ctx->buf[j + 8] = *in_ptr;
443 *out_ptr = ctx->buf[j] ^ (*in_ptr);
445 ctx->buf[j + 8] = *out_ptr;
448 memcpy(ctx->iv, ctx->buf + 8, 8);
456 for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
458 * block cipher current iv
460 gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
462 * xor next block of input text with it and output it
468 memcpy(ctx->iv, in_ptr, 8);
469 for (j = 0; j < 8; j++) {
470 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
473 /* Next iv is next block of cipher text */
475 memcpy(ctx->iv, out_ptr, 8);
477 /* Process rest of buffer */
479 gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
481 memcpy(ctx->buf + 8, in_ptr, inl - i);
482 for (j = 0; i < inl; j++, i++) {
483 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
487 memcpy(ctx->buf + 8, out_ptr, j);
494 static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
495 const unsigned char *in, size_t inl)
497 const unsigned char *in_ptr = in;
498 unsigned char *out_ptr = out;
501 /* process partial block if any */
503 for (j = ctx->num, i = 0; j < 8 && i < inl;
504 j++, i++, in_ptr++, out_ptr++) {
505 *out_ptr = ctx->buf[j] ^ (*in_ptr);
515 for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
517 * block cipher current iv
520 gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
522 * xor next block of input text with it and output it
527 for (j = 0; j < 8; j++) {
528 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
531 /* Process rest of buffer */
533 gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
534 for (j = 0; i < inl; j++, i++) {
535 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
544 /* Cleaning up of EVP_CIPHER_CTX */
545 int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
547 gost_destroy(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx);
548 ctx->app_data = NULL;
552 /* Control function for gost cipher */
553 int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
558 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
562 return gost_cipher_set_param(c, arg);
564 case EVP_CTRL_RAND_KEY:
566 if (RAND_bytes((unsigned char *)ptr, ctx->key_len) <= 0) {
567 GOSTerr(GOST_F_GOST_CIPHER_CTL, GOST_R_RNG_ERROR);
572 case EVP_CTRL_PBE_PRF_NID:
574 const char *params = get_gost_engine_param(GOST_PARAM_PBE_PARAMS);
575 int nid = NID_id_tc26_hmac_gost_3411_2012_512;
578 if (!strcmp("md_gost12_256", params))
579 nid = NID_id_tc26_hmac_gost_3411_2012_256;
580 else if (!strcmp("md_gost12_512", params))
581 nid = NID_id_tc26_hmac_gost_3411_2012_512;
582 else if (!strcmp("md_gost94", params))
583 nid = NID_id_HMACGostR3411_94;
592 GOSTerr(GOST_F_GOST_CIPHER_CTL,
593 GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
599 /* Set cipher parameters from ASN1 structure */
600 int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
603 unsigned char *buf = NULL;
604 unsigned char *p = NULL;
605 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
606 GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();
607 ASN1_OCTET_STRING *os = NULL;
609 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
612 if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len)) {
613 GOST_CIPHER_PARAMS_free(gcp);
614 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
617 ASN1_OBJECT_free(gcp->enc_param_set);
618 gcp->enc_param_set = OBJ_nid2obj(c->paramNID);
620 len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);
621 p = buf = OPENSSL_malloc(len);
623 GOST_CIPHER_PARAMS_free(gcp);
624 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
627 i2d_GOST_CIPHER_PARAMS(gcp, &p);
628 GOST_CIPHER_PARAMS_free(gcp);
630 os = ASN1_OCTET_STRING_new();
632 if (!os || !ASN1_OCTET_STRING_set(os, buf, len)) {
634 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE);
639 ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
643 /* Store parameters into ASN1 structure */
644 int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
648 GOST_CIPHER_PARAMS *gcp = NULL;
650 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
653 if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) {
657 p = params->value.sequence->data;
659 gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p,
660 params->value.sequence->length);
662 len = gcp->iv->length;
663 if (len != ctx->cipher->iv_len) {
664 GOST_CIPHER_PARAMS_free(gcp);
665 GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS, GOST_R_INVALID_IV_LENGTH);
669 nid = OBJ_obj2nid(gcp->enc_param_set);
670 if (nid == NID_undef) {
671 GOST_CIPHER_PARAMS_free(gcp);
672 GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS,
673 GOST_R_INVALID_CIPHER_PARAM_OID);
677 if (!gost_cipher_set_param(c, nid)) {
678 GOST_CIPHER_PARAMS_free(gcp);
681 memcpy(ctx->oiv, gcp->iv->data, len);
683 GOST_CIPHER_PARAMS_free(gcp);
688 static int gost_imit_init(EVP_MD_CTX *ctx, gost_subst_block * block)
690 struct ossl_gost_imit_ctx *c = EVP_MD_CTX_md_data(ctx);
691 memset(c->buffer, 0, sizeof(c->buffer));
692 memset(c->partial_block, 0, sizeof(c->partial_block));
697 gost_init(&(c->cctx), block);
701 static int gost_imit_init_cpa(EVP_MD_CTX *ctx)
703 return gost_imit_init(ctx, &Gost28147_CryptoProParamSetA);
706 static int gost_imit_init_cp_12(EVP_MD_CTX *ctx)
708 return gost_imit_init(ctx, &Gost28147_TC26ParamSetZ);
711 static void mac_block_mesh(struct ossl_gost_imit_ctx *c,
712 const unsigned char *data)
714 unsigned char buffer[8];
716 * We are using local buffer for iv because CryptoPro doesn't interpret
717 * internal state of MAC algorithm as iv during keymeshing (but does
718 * initialize internal state from iv in key transport
720 assert(c->count % 8 == 0 && c->count <= 1024);
721 if (c->key_meshing && c->count == 1024) {
722 cryptopro_key_meshing(&(c->cctx), buffer);
724 mac_block(&(c->cctx), c->buffer, data);
725 c->count = c->count % 1024 + 8;
728 int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count)
730 struct ossl_gost_imit_ctx *c = EVP_MD_CTX_md_data(ctx);
731 const unsigned char *p = data;
732 size_t bytes = count, i;
734 GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET);
738 for (i = c->bytes_left; i < 8 && bytes > 0; bytes--, i++, p++) {
739 c->partial_block[i] = *p;
742 mac_block_mesh(c, c->partial_block);
749 mac_block_mesh(c, p);
754 memcpy(c->partial_block, p, bytes);
756 c->bytes_left = bytes;
760 int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md)
762 struct ossl_gost_imit_ctx *c = EVP_MD_CTX_md_data(ctx);
764 GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET);
767 if (c->count == 0 && c->bytes_left) {
768 unsigned char buffer[8];
769 memset(buffer, 0, 8);
770 gost_imit_update(ctx, buffer, 8);
774 for (i = c->bytes_left; i < 8; i++) {
775 c->partial_block[i] = 0;
777 mac_block_mesh(c, c->partial_block);
779 get_mac(c->buffer, 8 * c->dgst_size, md);
783 int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr)
786 case EVP_MD_CTRL_KEY_LEN:
787 *((unsigned int *)(ptr)) = 32;
789 case EVP_MD_CTRL_SET_KEY:
791 struct ossl_gost_imit_ctx *gost_imit_ctx = EVP_MD_CTX_md_data(ctx);
793 if (EVP_MD_meth_get_init(EVP_MD_CTX_md(ctx))(ctx) <= 0) {
794 GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_MAC_KEY_NOT_SET);
797 EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_NO_INIT);
800 struct gost_mac_key *key = (struct gost_mac_key *)ptr;
801 if (key->mac_param_nid != NID_undef) {
802 const struct gost_cipher_info *param =
803 get_encryption_params(OBJ_nid2obj
804 (key->mac_param_nid));
806 GOSTerr(GOST_F_GOST_IMIT_CTRL,
807 GOST_R_INVALID_MAC_PARAMS);
810 gost_init(&(gost_imit_ctx->cctx), param->sblock);
812 gost_key(&(gost_imit_ctx->cctx), key->key);
813 gost_imit_ctx->key_set = 1;
816 } else if (arg == 32) {
817 gost_key(&(gost_imit_ctx->cctx), ptr);
818 gost_imit_ctx->key_set = 1;
821 GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_SIZE);
824 case EVP_MD_CTRL_MAC_LEN:
826 struct ossl_gost_imit_ctx *c = EVP_MD_CTX_md_data(ctx);
827 if (arg < 1 || arg > 8) {
828 GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_SIZE);
840 int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
842 if (EVP_MD_CTX_md_data(to) && EVP_MD_CTX_md_data(from)) {
843 memcpy(EVP_MD_CTX_md_data(to), EVP_MD_CTX_md_data(from),
844 sizeof(struct ossl_gost_imit_ctx));
849 /* Clean up imit ctx */
850 int gost_imit_cleanup(EVP_MD_CTX *ctx)
852 memset(EVP_MD_CTX_md_data(ctx), 0, sizeof(struct ossl_gost_imit_ctx));