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/rand.h>
12 #include "e_gost_err.h"
15 #if !defined(CCGOST_DEBUG) && !defined(DEBUG)
22 static int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
23 const unsigned char *iv, int enc);
24 static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
25 const unsigned char *iv, int enc);
26 /* Handles block of data in CFB mode */
27 static int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
28 const unsigned char *in, size_t inl);
29 /* Handles block of data in CNT mode */
30 static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
31 const unsigned char *in, size_t inl);
32 /* Cleanup function */
33 static int gost_cipher_cleanup(EVP_CIPHER_CTX *);
34 /* set/get cipher parameters */
35 static int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
36 static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
37 /* Control function */
38 static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr);
40 EVP_CIPHER cipher_gost = {
45 EVP_CIPH_CFB_MODE | EVP_CIPH_NO_PADDING |
46 EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
50 sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
51 gost89_set_asn1_parameters,
52 gost89_get_asn1_parameters,
57 EVP_CIPHER cipher_gost_cpacnt = {
62 EVP_CIPH_OFB_MODE | EVP_CIPH_NO_PADDING |
63 EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
67 sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
68 gost89_set_asn1_parameters,
69 gost89_get_asn1_parameters,
74 /* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */
75 /* Init functions which set specific parameters */
76 static int gost_imit_init_cpa(EVP_MD_CTX *ctx);
77 /* process block of data */
78 static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count);
79 /* Return computed value */
80 static int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md);
82 static int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from);
83 static int gost_imit_cleanup(EVP_MD_CTX *ctx);
84 /* Control function, knows how to set MAC key.*/
85 static int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr);
87 EVP_MD imit_gost_cpa = {
88 NID_id_Gost28147_89_MAC,
101 sizeof(struct ossl_gost_imit_ctx),
106 * Correspondence between gost parameter OIDs and substitution blocks
107 * NID field is filed by register_gost_NID function in engine.c
108 * upon engine initialization
111 struct gost_cipher_info gost_cipher_list[] = {
118 * {NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},
120 {NID_id_Gost28147_89_cc, &GostR3411_94_CryptoProParamSet, 0},
121 {NID_id_Gost28147_89_CryptoPro_A_ParamSet, &Gost28147_CryptoProParamSetA,
123 {NID_id_Gost28147_89_CryptoPro_B_ParamSet, &Gost28147_CryptoProParamSetB,
125 {NID_id_Gost28147_89_CryptoPro_C_ParamSet, &Gost28147_CryptoProParamSetC,
127 {NID_id_Gost28147_89_CryptoPro_D_ParamSet, &Gost28147_CryptoProParamSetD,
129 {NID_id_Gost28147_89_TestParamSet, &Gost28147_TestParamSet, 1},
134 * get encryption parameters from crypto network settings FIXME For now we
135 * use environment var CRYPT_PARAMS as place to store these settings.
136 * Actually, it is better to use engine control command, read from
137 * configuration file to set them
139 const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj)
142 struct gost_cipher_info *param;
144 const char *params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS);
145 if (!params || !strlen(params))
146 return &gost_cipher_list[1];
148 nid = OBJ_txt2nid(params);
149 if (nid == NID_undef) {
150 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,
151 GOST_R_INVALID_CIPHER_PARAM_OID);
155 nid = OBJ_obj2nid(obj);
157 for (param = gost_cipher_list; param->sblock != NULL && param->nid != nid;
159 if (!param->sblock) {
160 GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, GOST_R_INVALID_CIPHER_PARAMS);
166 /* Sets cipher param from paramset NID. */
167 static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c, int nid)
169 const struct gost_cipher_info *param;
171 get_encryption_params((nid == NID_undef ? NULL : OBJ_nid2obj(nid)));
175 c->paramNID = param->nid;
176 c->key_meshing = param->key_meshing;
178 gost_init(&(c->cctx), param->sblock);
182 /* Initializes EVP_CIPHER_CTX by paramset NID */
183 static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx,
184 const unsigned char *key,
185 const unsigned char *iv, int enc,
186 int paramNID, int mode)
188 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
189 if (ctx->app_data == NULL) {
190 if (!gost_cipher_set_param(c, paramNID))
192 ctx->app_data = ctx->cipher_data;
195 gost_key(&(c->cctx), key);
197 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
198 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
202 static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
203 const unsigned char *iv, int enc)
205 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
206 gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA);
210 gost_key(&(c->cctx), key);
212 memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
213 memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
217 /* Initializes EVP_CIPHER_CTX with default values */
218 int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
219 const unsigned char *iv, int enc)
221 return gost_cipher_init_param(ctx, key, iv, enc, NID_undef,
226 * Wrapper around gostcrypt function from gost89.c which perform key meshing
229 static void gost_crypt_mesh(void *ctx, unsigned char *iv, unsigned char *buf)
231 struct ossl_gost_cipher_ctx *c = ctx;
232 assert(c->count % 8 == 0 && c->count <= 1024);
233 if (c->key_meshing && c->count == 1024) {
234 cryptopro_key_meshing(&(c->cctx), iv);
236 gostcrypt(&(c->cctx), iv, buf);
237 c->count = c->count % 1024 + 8;
240 static void gost_cnt_next(void *ctx, unsigned char *iv, unsigned char *buf)
242 struct ossl_gost_cipher_ctx *c = ctx;
244 unsigned char buf1[8];
245 assert(c->count % 8 == 0 && c->count <= 1024);
246 if (c->key_meshing && c->count == 1024) {
247 cryptopro_key_meshing(&(c->cctx), iv);
250 gostcrypt(&(c->cctx), iv, buf1);
254 g = buf1[0] | (buf1[1] << 8) | (buf1[2] << 16) | (buf1[3] << 24);
256 buf1[0] = (unsigned char)(g & 0xff);
257 buf1[1] = (unsigned char)((g >> 8) & 0xff);
258 buf1[2] = (unsigned char)((g >> 16) & 0xff);
259 buf1[3] = (unsigned char)((g >> 24) & 0xff);
260 g = buf1[4] | (buf1[5] << 8) | (buf1[6] << 16) | (buf1[7] << 24);
263 if (go > g) /* overflow */
265 buf1[4] = (unsigned char)(g & 0xff);
266 buf1[5] = (unsigned char)((g >> 8) & 0xff);
267 buf1[6] = (unsigned char)((g >> 16) & 0xff);
268 buf1[7] = (unsigned char)((g >> 24) & 0xff);
270 gostcrypt(&(c->cctx), buf1, buf);
271 c->count = c->count % 1024 + 8;
274 /* GOST encryption in CFB mode */
275 int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
276 const unsigned char *in, size_t inl)
278 const unsigned char *in_ptr = in;
279 unsigned char *out_ptr = out;
282 /* process partial block if any */
284 for (j = ctx->num, i = 0; j < 8 && i < inl;
285 j++, i++, in_ptr++, out_ptr++) {
287 ctx->buf[j + 8] = *in_ptr;
288 *out_ptr = ctx->buf[j] ^ (*in_ptr);
290 ctx->buf[j + 8] = *out_ptr;
293 memcpy(ctx->iv, ctx->buf + 8, 8);
301 for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
303 * block cipher current iv
305 gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
307 * xor next block of input text with it and output it
313 memcpy(ctx->iv, in_ptr, 8);
314 for (j = 0; j < 8; j++) {
315 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
318 /* Next iv is next block of cipher text */
320 memcpy(ctx->iv, out_ptr, 8);
322 /* Process rest of buffer */
324 gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
326 memcpy(ctx->buf + 8, in_ptr, inl - i);
327 for (j = 0; i < inl; j++, i++) {
328 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
332 memcpy(ctx->buf + 8, out_ptr, j);
339 static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
340 const unsigned char *in, size_t inl)
342 const unsigned char *in_ptr = in;
343 unsigned char *out_ptr = out;
346 /* process partial block if any */
348 for (j = ctx->num, i = 0; j < 8 && i < inl;
349 j++, i++, in_ptr++, out_ptr++) {
350 *out_ptr = ctx->buf[j] ^ (*in_ptr);
360 for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
362 * block cipher current iv
365 gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
367 * xor next block of input text with it and output it
372 for (j = 0; j < 8; j++) {
373 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
376 /* Process rest of buffer */
378 gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
379 for (j = 0; i < inl; j++, i++) {
380 out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
389 /* Cleaning up of EVP_CIPHER_CTX */
390 int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
392 gost_destroy(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx);
393 ctx->app_data = NULL;
397 /* Control function for gost cipher */
398 int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
401 case EVP_CTRL_RAND_KEY:
403 if (RAND_bytes((unsigned char *)ptr, ctx->key_len) <= 0) {
404 GOSTerr(GOST_F_GOST_CIPHER_CTL,
405 GOST_R_RANDOM_GENERATOR_ERROR);
410 case EVP_CTRL_PBE_PRF_NID:
412 *((int *)ptr) = NID_id_HMACGostR3411_94;
419 GOSTerr(GOST_F_GOST_CIPHER_CTL,
420 GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
426 /* Set cipher parameters from ASN1 structure */
427 int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
430 unsigned char *buf = NULL;
431 unsigned char *p = NULL;
432 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
433 GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();
434 ASN1_OCTET_STRING *os = NULL;
436 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
439 if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len)) {
440 GOST_CIPHER_PARAMS_free(gcp);
441 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
444 ASN1_OBJECT_free(gcp->enc_param_set);
445 gcp->enc_param_set = OBJ_nid2obj(c->paramNID);
447 len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);
448 p = buf = (unsigned char *)OPENSSL_malloc(len);
450 GOST_CIPHER_PARAMS_free(gcp);
451 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
454 i2d_GOST_CIPHER_PARAMS(gcp, &p);
455 GOST_CIPHER_PARAMS_free(gcp);
457 os = ASN1_OCTET_STRING_new();
459 if (!os || !ASN1_OCTET_STRING_set(os, buf, len)) {
461 GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
466 ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os);
470 /* Store parameters into ASN1 structure */
471 int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
475 GOST_CIPHER_PARAMS *gcp = NULL;
477 struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
478 if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) {
482 p = params->value.sequence->data;
484 gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p,
485 params->value.sequence->length);
487 len = gcp->iv->length;
488 if (len != ctx->cipher->iv_len) {
489 GOST_CIPHER_PARAMS_free(gcp);
490 GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS, GOST_R_INVALID_IV_LENGTH);
493 if (!gost_cipher_set_param(c, OBJ_obj2nid(gcp->enc_param_set))) {
494 GOST_CIPHER_PARAMS_free(gcp);
497 memcpy(ctx->oiv, gcp->iv->data, len);
499 GOST_CIPHER_PARAMS_free(gcp);
504 int gost_imit_init_cpa(EVP_MD_CTX *ctx)
506 struct ossl_gost_imit_ctx *c = ctx->md_data;
507 memset(c->buffer, 0, sizeof(c->buffer));
508 memset(c->partial_block, 0, sizeof(c->partial_block));
512 gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA);
516 static void mac_block_mesh(struct ossl_gost_imit_ctx *c,
517 const unsigned char *data)
519 unsigned char buffer[8];
521 * We are using local buffer for iv because CryptoPro doesn't interpret
522 * internal state of MAC algorithm as iv during keymeshing (but does
523 * initialize internal state from iv in key transport
525 assert(c->count % 8 == 0 && c->count <= 1024);
526 if (c->key_meshing && c->count == 1024) {
527 cryptopro_key_meshing(&(c->cctx), buffer);
529 mac_block(&(c->cctx), c->buffer, data);
530 c->count = c->count % 1024 + 8;
533 int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count)
535 struct ossl_gost_imit_ctx *c = ctx->md_data;
536 const unsigned char *p = data;
537 size_t bytes = count, i;
539 GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET);
543 for (i = c->bytes_left; i < 8 && bytes > 0; bytes--, i++, p++) {
544 c->partial_block[i] = *p;
547 mac_block_mesh(c, c->partial_block);
554 mac_block_mesh(c, p);
559 memcpy(c->partial_block, p, bytes);
561 c->bytes_left = bytes;
565 int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md)
567 struct ossl_gost_imit_ctx *c = ctx->md_data;
569 GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET);
572 if (c->count == 0 && c->bytes_left) {
573 unsigned char buffer[8];
574 memset(buffer, 0, 8);
575 gost_imit_update(ctx, buffer, 8);
579 for (i = c->bytes_left; i < 8; i++) {
580 c->partial_block[i] = 0;
582 mac_block_mesh(c, c->partial_block);
584 get_mac(c->buffer, 32, md);
588 int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr)
591 case EVP_MD_CTRL_KEY_LEN:
592 *((unsigned int *)(ptr)) = 32;
594 case EVP_MD_CTRL_SET_KEY:
597 GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_LENGTH);
601 gost_key(&(((struct ossl_gost_imit_ctx *)(ctx->md_data))->cctx),
603 ((struct ossl_gost_imit_ctx *)(ctx->md_data))->key_set = 1;
612 int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
614 memcpy(to->md_data, from->md_data, sizeof(struct ossl_gost_imit_ctx));
618 /* Clean up imit ctx */
619 int gost_imit_cleanup(EVP_MD_CTX *ctx)
621 memset(ctx->md_data, 0, sizeof(struct ossl_gost_imit_ctx));