1238384Sjkim/********************************************************************** 2238384Sjkim * gost_crypt.c * 3238384Sjkim * Copyright (c) 2005-2006 Cryptocom LTD * 4238384Sjkim * This file is distributed under the same license as OpenSSL * 5238384Sjkim * * 6238384Sjkim * OpenSSL interface to GOST 28147-89 cipher functions * 7238384Sjkim * Requires OpenSSL 0.9.9 for compilation * 8238384Sjkim **********************************************************************/ 9238384Sjkim#include <string.h> 10238384Sjkim#include "gost89.h" 11238384Sjkim#include <openssl/rand.h> 12238384Sjkim#include "e_gost_err.h" 13238384Sjkim#include "gost_lcl.h" 14246772Sjkim 15246772Sjkim#if !defined(CCGOST_DEBUG) && !defined(DEBUG) 16246772Sjkim# ifndef NDEBUG 17246772Sjkim# define NDEBUG 18246772Sjkim# endif 19246772Sjkim#endif 20246772Sjkim#include <assert.h> 21246772Sjkim 22296341Sdelphijstatic int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, 23296341Sdelphij const unsigned char *iv, int enc); 24296341Sdelphijstatic int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key, 25296341Sdelphij const unsigned char *iv, int enc); 26296341Sdelphij/* Handles block of data in CFB mode */ 27296341Sdelphijstatic int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out, 28296341Sdelphij const unsigned char *in, size_t inl); 29296341Sdelphij/* Handles block of data in CNT mode */ 30296341Sdelphijstatic int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out, 31296341Sdelphij const unsigned char *in, size_t inl); 32296341Sdelphij/* Cleanup function */ 33238384Sjkimstatic int gost_cipher_cleanup(EVP_CIPHER_CTX *); 34238384Sjkim/* set/get cipher parameters */ 35296341Sdelphijstatic int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params); 36296341Sdelphijstatic int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params); 37238384Sjkim/* Control function */ 38296341Sdelphijstatic int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr); 39238384Sjkim 40296341SdelphijEVP_CIPHER cipher_gost = { 41296341Sdelphij NID_id_Gost28147_89, 42296341Sdelphij 1, /* block_size */ 43296341Sdelphij 32, /* key_size */ 44296341Sdelphij 8, /* iv_len */ 45296341Sdelphij EVP_CIPH_CFB_MODE | EVP_CIPH_NO_PADDING | 46296341Sdelphij EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT, 47296341Sdelphij gost_cipher_init, 48296341Sdelphij gost_cipher_do_cfb, 49296341Sdelphij gost_cipher_cleanup, 50296341Sdelphij sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */ 51296341Sdelphij gost89_set_asn1_parameters, 52296341Sdelphij gost89_get_asn1_parameters, 53296341Sdelphij gost_cipher_ctl, 54296341Sdelphij NULL, 55296341Sdelphij}; 56238384Sjkim 57296341SdelphijEVP_CIPHER cipher_gost_cpacnt = { 58296341Sdelphij NID_gost89_cnt, 59296341Sdelphij 1, /* block_size */ 60296341Sdelphij 32, /* key_size */ 61296341Sdelphij 8, /* iv_len */ 62296341Sdelphij EVP_CIPH_OFB_MODE | EVP_CIPH_NO_PADDING | 63296341Sdelphij EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT, 64296341Sdelphij gost_cipher_init_cpa, 65296341Sdelphij gost_cipher_do_cnt, 66296341Sdelphij gost_cipher_cleanup, 67296341Sdelphij sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */ 68296341Sdelphij gost89_set_asn1_parameters, 69296341Sdelphij gost89_get_asn1_parameters, 70296341Sdelphij gost_cipher_ctl, 71296341Sdelphij NULL, 72296341Sdelphij}; 73238384Sjkim 74238384Sjkim/* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */ 75238384Sjkim/* Init functions which set specific parameters */ 76238384Sjkimstatic int gost_imit_init_cpa(EVP_MD_CTX *ctx); 77238384Sjkim/* process block of data */ 78238384Sjkimstatic int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count); 79238384Sjkim/* Return computed value */ 80296341Sdelphijstatic int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md); 81238384Sjkim/* Copies context */ 82296341Sdelphijstatic int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from); 83238384Sjkimstatic int gost_imit_cleanup(EVP_MD_CTX *ctx); 84238384Sjkim/* Control function, knows how to set MAC key.*/ 85296341Sdelphijstatic int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr); 86238384Sjkim 87296341SdelphijEVP_MD imit_gost_cpa = { 88296341Sdelphij NID_id_Gost28147_89_MAC, 89296341Sdelphij NID_undef, 90296341Sdelphij 4, 91296341Sdelphij 0, 92296341Sdelphij gost_imit_init_cpa, 93296341Sdelphij gost_imit_update, 94296341Sdelphij gost_imit_final, 95296341Sdelphij gost_imit_copy, 96296341Sdelphij gost_imit_cleanup, 97296341Sdelphij NULL, 98296341Sdelphij NULL, 99296341Sdelphij {0, 0, 0, 0, 0}, 100296341Sdelphij 8, 101296341Sdelphij sizeof(struct ossl_gost_imit_ctx), 102296341Sdelphij gost_imit_ctrl 103296341Sdelphij}; 104238384Sjkim 105296341Sdelphij/* 106238384Sjkim * Correspondence between gost parameter OIDs and substitution blocks 107238384Sjkim * NID field is filed by register_gost_NID function in engine.c 108238384Sjkim * upon engine initialization 109238384Sjkim */ 110238384Sjkim 111296341Sdelphijstruct gost_cipher_info gost_cipher_list[] = { 112296341Sdelphij /*- NID *//* 113296341Sdelphij * Subst block 114296341Sdelphij *//* 115296341Sdelphij * Key meshing 116296341Sdelphij */ 117296341Sdelphij /* 118296341Sdelphij * {NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0}, 119296341Sdelphij */ 120296341Sdelphij {NID_id_Gost28147_89_cc, &GostR3411_94_CryptoProParamSet, 0}, 121296341Sdelphij {NID_id_Gost28147_89_CryptoPro_A_ParamSet, &Gost28147_CryptoProParamSetA, 122296341Sdelphij 1}, 123296341Sdelphij {NID_id_Gost28147_89_CryptoPro_B_ParamSet, &Gost28147_CryptoProParamSetB, 124296341Sdelphij 1}, 125296341Sdelphij {NID_id_Gost28147_89_CryptoPro_C_ParamSet, &Gost28147_CryptoProParamSetC, 126296341Sdelphij 1}, 127296341Sdelphij {NID_id_Gost28147_89_CryptoPro_D_ParamSet, &Gost28147_CryptoProParamSetD, 128296341Sdelphij 1}, 129296341Sdelphij {NID_id_Gost28147_89_TestParamSet, &Gost28147_TestParamSet, 1}, 130296341Sdelphij {NID_undef, NULL, 0} 131296341Sdelphij}; 132238384Sjkim 133296341Sdelphij/* 134296341Sdelphij * get encryption parameters from crypto network settings FIXME For now we 135296341Sdelphij * use environment var CRYPT_PARAMS as place to store these settings. 136296341Sdelphij * Actually, it is better to use engine control command, read from 137296341Sdelphij * configuration file to set them 138296341Sdelphij */ 139238384Sjkimconst struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj) 140296341Sdelphij{ 141296341Sdelphij int nid; 142296341Sdelphij struct gost_cipher_info *param; 143296341Sdelphij if (!obj) { 144296341Sdelphij const char *params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS); 145296341Sdelphij if (!params || !strlen(params)) 146296341Sdelphij return &gost_cipher_list[1]; 147238384Sjkim 148296341Sdelphij nid = OBJ_txt2nid(params); 149296341Sdelphij if (nid == NID_undef) { 150296341Sdelphij GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, 151296341Sdelphij GOST_R_INVALID_CIPHER_PARAM_OID); 152296341Sdelphij return NULL; 153296341Sdelphij } 154296341Sdelphij } else { 155296341Sdelphij nid = OBJ_obj2nid(obj); 156296341Sdelphij } 157296341Sdelphij for (param = gost_cipher_list; param->sblock != NULL && param->nid != nid; 158296341Sdelphij param++) ; 159296341Sdelphij if (!param->sblock) { 160296341Sdelphij GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, GOST_R_INVALID_CIPHER_PARAMS); 161296341Sdelphij return NULL; 162296341Sdelphij } 163296341Sdelphij return param; 164296341Sdelphij} 165238384Sjkim 166238384Sjkim/* Sets cipher param from paramset NID. */ 167296341Sdelphijstatic int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c, int nid) 168296341Sdelphij{ 169296341Sdelphij const struct gost_cipher_info *param; 170296341Sdelphij param = 171296341Sdelphij get_encryption_params((nid == NID_undef ? NULL : OBJ_nid2obj(nid))); 172296341Sdelphij if (!param) 173296341Sdelphij return 0; 174238384Sjkim 175296341Sdelphij c->paramNID = param->nid; 176296341Sdelphij c->key_meshing = param->key_meshing; 177296341Sdelphij c->count = 0; 178296341Sdelphij gost_init(&(c->cctx), param->sblock); 179296341Sdelphij return 1; 180296341Sdelphij} 181296341Sdelphij 182238384Sjkim/* Initializes EVP_CIPHER_CTX by paramset NID */ 183296341Sdelphijstatic int gost_cipher_init_param(EVP_CIPHER_CTX *ctx, 184296341Sdelphij const unsigned char *key, 185296341Sdelphij const unsigned char *iv, int enc, 186296341Sdelphij int paramNID, int mode) 187296341Sdelphij{ 188296341Sdelphij struct ossl_gost_cipher_ctx *c = ctx->cipher_data; 189296341Sdelphij if (ctx->app_data == NULL) { 190296341Sdelphij if (!gost_cipher_set_param(c, paramNID)) 191296341Sdelphij return 0; 192296341Sdelphij ctx->app_data = ctx->cipher_data; 193296341Sdelphij } 194296341Sdelphij if (key) 195296341Sdelphij gost_key(&(c->cctx), key); 196296341Sdelphij if (iv) 197296341Sdelphij memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 198296341Sdelphij memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); 199296341Sdelphij return 1; 200296341Sdelphij} 201238384Sjkim 202238384Sjkimstatic int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key, 203296341Sdelphij const unsigned char *iv, int enc) 204296341Sdelphij{ 205296341Sdelphij struct ossl_gost_cipher_ctx *c = ctx->cipher_data; 206296341Sdelphij gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA); 207296341Sdelphij c->key_meshing = 1; 208296341Sdelphij c->count = 0; 209296341Sdelphij if (key) 210296341Sdelphij gost_key(&(c->cctx), key); 211296341Sdelphij if (iv) 212296341Sdelphij memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); 213296341Sdelphij memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); 214296341Sdelphij return 1; 215296341Sdelphij} 216238384Sjkim 217238384Sjkim/* Initializes EVP_CIPHER_CTX with default values */ 218238384Sjkimint gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, 219296341Sdelphij const unsigned char *iv, int enc) 220296341Sdelphij{ 221296341Sdelphij return gost_cipher_init_param(ctx, key, iv, enc, NID_undef, 222296341Sdelphij EVP_CIPH_CFB_MODE); 223296341Sdelphij} 224296341Sdelphij 225296341Sdelphij/* 226296341Sdelphij * Wrapper around gostcrypt function from gost89.c which perform key meshing 227296341Sdelphij * when nesseccary 228238384Sjkim */ 229296341Sdelphijstatic void gost_crypt_mesh(void *ctx, unsigned char *iv, unsigned char *buf) 230296341Sdelphij{ 231296341Sdelphij struct ossl_gost_cipher_ctx *c = ctx; 232296341Sdelphij assert(c->count % 8 == 0 && c->count <= 1024); 233296341Sdelphij if (c->key_meshing && c->count == 1024) { 234296341Sdelphij cryptopro_key_meshing(&(c->cctx), iv); 235296341Sdelphij } 236296341Sdelphij gostcrypt(&(c->cctx), iv, buf); 237296341Sdelphij c->count = c->count % 1024 + 8; 238296341Sdelphij} 239238384Sjkim 240296341Sdelphijstatic void gost_cnt_next(void *ctx, unsigned char *iv, unsigned char *buf) 241296341Sdelphij{ 242296341Sdelphij struct ossl_gost_cipher_ctx *c = ctx; 243296341Sdelphij word32 g, go; 244296341Sdelphij unsigned char buf1[8]; 245296341Sdelphij assert(c->count % 8 == 0 && c->count <= 1024); 246296341Sdelphij if (c->key_meshing && c->count == 1024) { 247296341Sdelphij cryptopro_key_meshing(&(c->cctx), iv); 248296341Sdelphij } 249296341Sdelphij if (c->count == 0) { 250296341Sdelphij gostcrypt(&(c->cctx), iv, buf1); 251296341Sdelphij } else { 252296341Sdelphij memcpy(buf1, iv, 8); 253296341Sdelphij } 254296341Sdelphij g = buf1[0] | (buf1[1] << 8) | (buf1[2] << 16) | (buf1[3] << 24); 255296341Sdelphij g += 0x01010101; 256296341Sdelphij buf1[0] = (unsigned char)(g & 0xff); 257296341Sdelphij buf1[1] = (unsigned char)((g >> 8) & 0xff); 258296341Sdelphij buf1[2] = (unsigned char)((g >> 16) & 0xff); 259296341Sdelphij buf1[3] = (unsigned char)((g >> 24) & 0xff); 260296341Sdelphij g = buf1[4] | (buf1[5] << 8) | (buf1[6] << 16) | (buf1[7] << 24); 261296341Sdelphij go = g; 262296341Sdelphij g += 0x01010104; 263296341Sdelphij if (go > g) /* overflow */ 264296341Sdelphij g++; 265296341Sdelphij buf1[4] = (unsigned char)(g & 0xff); 266296341Sdelphij buf1[5] = (unsigned char)((g >> 8) & 0xff); 267296341Sdelphij buf1[6] = (unsigned char)((g >> 16) & 0xff); 268296341Sdelphij buf1[7] = (unsigned char)((g >> 24) & 0xff); 269296341Sdelphij memcpy(iv, buf1, 8); 270296341Sdelphij gostcrypt(&(c->cctx), buf1, buf); 271296341Sdelphij c->count = c->count % 1024 + 8; 272296341Sdelphij} 273238384Sjkim 274238384Sjkim/* GOST encryption in CFB mode */ 275296341Sdelphijint gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out, 276296341Sdelphij const unsigned char *in, size_t inl) 277296341Sdelphij{ 278296341Sdelphij const unsigned char *in_ptr = in; 279296341Sdelphij unsigned char *out_ptr = out; 280296341Sdelphij size_t i = 0; 281296341Sdelphij size_t j = 0; 282238384Sjkim/* process partial block if any */ 283296341Sdelphij if (ctx->num) { 284296341Sdelphij for (j = ctx->num, i = 0; j < 8 && i < inl; 285296341Sdelphij j++, i++, in_ptr++, out_ptr++) { 286296341Sdelphij if (!ctx->encrypt) 287296341Sdelphij ctx->buf[j + 8] = *in_ptr; 288296341Sdelphij *out_ptr = ctx->buf[j] ^ (*in_ptr); 289296341Sdelphij if (ctx->encrypt) 290296341Sdelphij ctx->buf[j + 8] = *out_ptr; 291296341Sdelphij } 292296341Sdelphij if (j == 8) { 293296341Sdelphij memcpy(ctx->iv, ctx->buf + 8, 8); 294296341Sdelphij ctx->num = 0; 295296341Sdelphij } else { 296296341Sdelphij ctx->num = j; 297296341Sdelphij return 1; 298296341Sdelphij } 299296341Sdelphij } 300238384Sjkim 301296341Sdelphij for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) { 302296341Sdelphij /* 303296341Sdelphij * block cipher current iv 304296341Sdelphij */ 305296341Sdelphij gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf); 306296341Sdelphij /* 307296341Sdelphij * xor next block of input text with it and output it 308296341Sdelphij */ 309296341Sdelphij /* 310296341Sdelphij * output this block 311296341Sdelphij */ 312296341Sdelphij if (!ctx->encrypt) 313296341Sdelphij memcpy(ctx->iv, in_ptr, 8); 314296341Sdelphij for (j = 0; j < 8; j++) { 315296341Sdelphij out_ptr[j] = ctx->buf[j] ^ in_ptr[j]; 316296341Sdelphij } 317296341Sdelphij /* Encrypt */ 318296341Sdelphij /* Next iv is next block of cipher text */ 319296341Sdelphij if (ctx->encrypt) 320296341Sdelphij memcpy(ctx->iv, out_ptr, 8); 321296341Sdelphij } 322238384Sjkim/* Process rest of buffer */ 323296341Sdelphij if (i < inl) { 324296341Sdelphij gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf); 325296341Sdelphij if (!ctx->encrypt) 326296341Sdelphij memcpy(ctx->buf + 8, in_ptr, inl - i); 327296341Sdelphij for (j = 0; i < inl; j++, i++) { 328296341Sdelphij out_ptr[j] = ctx->buf[j] ^ in_ptr[j]; 329296341Sdelphij } 330296341Sdelphij ctx->num = j; 331296341Sdelphij if (ctx->encrypt) 332296341Sdelphij memcpy(ctx->buf + 8, out_ptr, j); 333296341Sdelphij } else { 334296341Sdelphij ctx->num = 0; 335296341Sdelphij } 336296341Sdelphij return 1; 337296341Sdelphij} 338238384Sjkim 339238384Sjkimstatic int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out, 340296341Sdelphij const unsigned char *in, size_t inl) 341296341Sdelphij{ 342296341Sdelphij const unsigned char *in_ptr = in; 343296341Sdelphij unsigned char *out_ptr = out; 344296341Sdelphij size_t i = 0; 345296341Sdelphij size_t j; 346238384Sjkim/* process partial block if any */ 347296341Sdelphij if (ctx->num) { 348296341Sdelphij for (j = ctx->num, i = 0; j < 8 && i < inl; 349296341Sdelphij j++, i++, in_ptr++, out_ptr++) { 350296341Sdelphij *out_ptr = ctx->buf[j] ^ (*in_ptr); 351296341Sdelphij } 352296341Sdelphij if (j == 8) { 353296341Sdelphij ctx->num = 0; 354296341Sdelphij } else { 355296341Sdelphij ctx->num = j; 356296341Sdelphij return 1; 357296341Sdelphij } 358296341Sdelphij } 359238384Sjkim 360296341Sdelphij for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) { 361296341Sdelphij /* 362296341Sdelphij * block cipher current iv 363296341Sdelphij */ 364296341Sdelphij /* Encrypt */ 365296341Sdelphij gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf); 366296341Sdelphij /* 367296341Sdelphij * xor next block of input text with it and output it 368296341Sdelphij */ 369296341Sdelphij /* 370296341Sdelphij * output this block 371296341Sdelphij */ 372296341Sdelphij for (j = 0; j < 8; j++) { 373296341Sdelphij out_ptr[j] = ctx->buf[j] ^ in_ptr[j]; 374296341Sdelphij } 375296341Sdelphij } 376238384Sjkim/* Process rest of buffer */ 377296341Sdelphij if (i < inl) { 378296341Sdelphij gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf); 379296341Sdelphij for (j = 0; i < inl; j++, i++) { 380296341Sdelphij out_ptr[j] = ctx->buf[j] ^ in_ptr[j]; 381296341Sdelphij } 382296341Sdelphij ctx->num = j; 383296341Sdelphij } else { 384296341Sdelphij ctx->num = 0; 385296341Sdelphij } 386296341Sdelphij return 1; 387296341Sdelphij} 388238384Sjkim 389238384Sjkim/* Cleaning up of EVP_CIPHER_CTX */ 390296341Sdelphijint gost_cipher_cleanup(EVP_CIPHER_CTX *ctx) 391296341Sdelphij{ 392296341Sdelphij gost_destroy(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx); 393296341Sdelphij ctx->app_data = NULL; 394296341Sdelphij return 1; 395296341Sdelphij} 396238384Sjkim 397238384Sjkim/* Control function for gost cipher */ 398296341Sdelphijint gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) 399296341Sdelphij{ 400296341Sdelphij switch (type) { 401296341Sdelphij case EVP_CTRL_RAND_KEY: 402296341Sdelphij { 403296341Sdelphij if (RAND_bytes((unsigned char *)ptr, ctx->key_len) <= 0) { 404296341Sdelphij GOSTerr(GOST_F_GOST_CIPHER_CTL, 405296341Sdelphij GOST_R_RANDOM_GENERATOR_ERROR); 406296341Sdelphij return -1; 407296341Sdelphij } 408296341Sdelphij break; 409296341Sdelphij } 410296341Sdelphij case EVP_CTRL_PBE_PRF_NID: 411296341Sdelphij if (ptr) { 412296341Sdelphij *((int *)ptr) = NID_id_HMACGostR3411_94; 413296341Sdelphij return 1; 414296341Sdelphij } else { 415296341Sdelphij return 0; 416296341Sdelphij } 417238384Sjkim 418296341Sdelphij default: 419296341Sdelphij GOSTerr(GOST_F_GOST_CIPHER_CTL, 420296341Sdelphij GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND); 421296341Sdelphij return -1; 422296341Sdelphij } 423296341Sdelphij return 1; 424296341Sdelphij} 425296341Sdelphij 426238384Sjkim/* Set cipher parameters from ASN1 structure */ 427296341Sdelphijint gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params) 428296341Sdelphij{ 429296341Sdelphij int len = 0; 430296341Sdelphij unsigned char *buf = NULL; 431296341Sdelphij unsigned char *p = NULL; 432296341Sdelphij struct ossl_gost_cipher_ctx *c = ctx->cipher_data; 433296341Sdelphij GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new(); 434296341Sdelphij ASN1_OCTET_STRING *os = NULL; 435296341Sdelphij if (!gcp) { 436296341Sdelphij GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); 437296341Sdelphij return 0; 438296341Sdelphij } 439296341Sdelphij if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len)) { 440296341Sdelphij GOST_CIPHER_PARAMS_free(gcp); 441296341Sdelphij GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); 442296341Sdelphij return 0; 443296341Sdelphij } 444296341Sdelphij ASN1_OBJECT_free(gcp->enc_param_set); 445296341Sdelphij gcp->enc_param_set = OBJ_nid2obj(c->paramNID); 446238384Sjkim 447296341Sdelphij len = i2d_GOST_CIPHER_PARAMS(gcp, NULL); 448296341Sdelphij p = buf = (unsigned char *)OPENSSL_malloc(len); 449296341Sdelphij if (!buf) { 450296341Sdelphij GOST_CIPHER_PARAMS_free(gcp); 451296341Sdelphij GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); 452296341Sdelphij return 0; 453296341Sdelphij } 454296341Sdelphij i2d_GOST_CIPHER_PARAMS(gcp, &p); 455296341Sdelphij GOST_CIPHER_PARAMS_free(gcp); 456238384Sjkim 457296341Sdelphij os = ASN1_OCTET_STRING_new(); 458238384Sjkim 459296341Sdelphij if (!os || !ASN1_OCTET_STRING_set(os, buf, len)) { 460296341Sdelphij OPENSSL_free(buf); 461296341Sdelphij GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY); 462296341Sdelphij return 0; 463296341Sdelphij } 464296341Sdelphij OPENSSL_free(buf); 465238384Sjkim 466296341Sdelphij ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os); 467296341Sdelphij return 1; 468296341Sdelphij} 469238384Sjkim 470238384Sjkim/* Store parameters into ASN1 structure */ 471296341Sdelphijint gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params) 472296341Sdelphij{ 473296341Sdelphij int ret = -1; 474296341Sdelphij int len; 475296341Sdelphij GOST_CIPHER_PARAMS *gcp = NULL; 476296341Sdelphij unsigned char *p; 477296341Sdelphij struct ossl_gost_cipher_ctx *c = ctx->cipher_data; 478296341Sdelphij if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) { 479296341Sdelphij return ret; 480296341Sdelphij } 481238384Sjkim 482296341Sdelphij p = params->value.sequence->data; 483238384Sjkim 484296341Sdelphij gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p, 485296341Sdelphij params->value.sequence->length); 486238384Sjkim 487296341Sdelphij len = gcp->iv->length; 488296341Sdelphij if (len != ctx->cipher->iv_len) { 489296341Sdelphij GOST_CIPHER_PARAMS_free(gcp); 490296341Sdelphij GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS, GOST_R_INVALID_IV_LENGTH); 491296341Sdelphij return -1; 492296341Sdelphij } 493296341Sdelphij if (!gost_cipher_set_param(c, OBJ_obj2nid(gcp->enc_param_set))) { 494296341Sdelphij GOST_CIPHER_PARAMS_free(gcp); 495296341Sdelphij return -1; 496296341Sdelphij } 497296341Sdelphij memcpy(ctx->oiv, gcp->iv->data, len); 498238384Sjkim 499296341Sdelphij GOST_CIPHER_PARAMS_free(gcp); 500238384Sjkim 501296341Sdelphij return 1; 502296341Sdelphij} 503238384Sjkim 504238384Sjkimint gost_imit_init_cpa(EVP_MD_CTX *ctx) 505296341Sdelphij{ 506296341Sdelphij struct ossl_gost_imit_ctx *c = ctx->md_data; 507296341Sdelphij memset(c->buffer, 0, sizeof(c->buffer)); 508296341Sdelphij memset(c->partial_block, 0, sizeof(c->partial_block)); 509296341Sdelphij c->count = 0; 510296341Sdelphij c->bytes_left = 0; 511296341Sdelphij c->key_meshing = 1; 512296341Sdelphij gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA); 513296341Sdelphij return 1; 514296341Sdelphij} 515238384Sjkim 516296341Sdelphijstatic void mac_block_mesh(struct ossl_gost_imit_ctx *c, 517296341Sdelphij const unsigned char *data) 518296341Sdelphij{ 519296341Sdelphij unsigned char buffer[8]; 520296341Sdelphij /* 521296341Sdelphij * We are using local buffer for iv because CryptoPro doesn't interpret 522296341Sdelphij * internal state of MAC algorithm as iv during keymeshing (but does 523296341Sdelphij * initialize internal state from iv in key transport 524296341Sdelphij */ 525296341Sdelphij assert(c->count % 8 == 0 && c->count <= 1024); 526296341Sdelphij if (c->key_meshing && c->count == 1024) { 527296341Sdelphij cryptopro_key_meshing(&(c->cctx), buffer); 528296341Sdelphij } 529296341Sdelphij mac_block(&(c->cctx), c->buffer, data); 530296341Sdelphij c->count = c->count % 1024 + 8; 531296341Sdelphij} 532238384Sjkim 533238384Sjkimint gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count) 534296341Sdelphij{ 535296341Sdelphij struct ossl_gost_imit_ctx *c = ctx->md_data; 536296341Sdelphij const unsigned char *p = data; 537296341Sdelphij size_t bytes = count, i; 538296341Sdelphij if (!(c->key_set)) { 539296341Sdelphij GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET); 540296341Sdelphij return 0; 541296341Sdelphij } 542296341Sdelphij if (c->bytes_left) { 543296341Sdelphij for (i = c->bytes_left; i < 8 && bytes > 0; bytes--, i++, p++) { 544296341Sdelphij c->partial_block[i] = *p; 545296341Sdelphij } 546296341Sdelphij if (i == 8) { 547296341Sdelphij mac_block_mesh(c, c->partial_block); 548296341Sdelphij } else { 549296341Sdelphij c->bytes_left = i; 550296341Sdelphij return 1; 551296341Sdelphij } 552296341Sdelphij } 553296341Sdelphij while (bytes > 8) { 554296341Sdelphij mac_block_mesh(c, p); 555296341Sdelphij p += 8; 556296341Sdelphij bytes -= 8; 557296341Sdelphij } 558296341Sdelphij if (bytes > 0) { 559296341Sdelphij memcpy(c->partial_block, p, bytes); 560296341Sdelphij } 561296341Sdelphij c->bytes_left = bytes; 562296341Sdelphij return 1; 563296341Sdelphij} 564238384Sjkim 565296341Sdelphijint gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md) 566296341Sdelphij{ 567296341Sdelphij struct ossl_gost_imit_ctx *c = ctx->md_data; 568296341Sdelphij if (!c->key_set) { 569296341Sdelphij GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET); 570296341Sdelphij return 0; 571296341Sdelphij } 572296341Sdelphij if (c->count == 0 && c->bytes_left) { 573296341Sdelphij unsigned char buffer[8]; 574296341Sdelphij memset(buffer, 0, 8); 575296341Sdelphij gost_imit_update(ctx, buffer, 8); 576296341Sdelphij } 577296341Sdelphij if (c->bytes_left) { 578296341Sdelphij int i; 579296341Sdelphij for (i = c->bytes_left; i < 8; i++) { 580296341Sdelphij c->partial_block[i] = 0; 581296341Sdelphij } 582296341Sdelphij mac_block_mesh(c, c->partial_block); 583296341Sdelphij } 584296341Sdelphij get_mac(c->buffer, 32, md); 585296341Sdelphij return 1; 586296341Sdelphij} 587238384Sjkim 588296341Sdelphijint gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr) 589296341Sdelphij{ 590296341Sdelphij switch (type) { 591296341Sdelphij case EVP_MD_CTRL_KEY_LEN: 592296341Sdelphij *((unsigned int *)(ptr)) = 32; 593296341Sdelphij return 1; 594296341Sdelphij case EVP_MD_CTRL_SET_KEY: 595296341Sdelphij { 596296341Sdelphij if (arg != 32) { 597296341Sdelphij GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_LENGTH); 598296341Sdelphij return 0; 599296341Sdelphij } 600238384Sjkim 601296341Sdelphij gost_key(&(((struct ossl_gost_imit_ctx *)(ctx->md_data))->cctx), 602296341Sdelphij ptr); 603296341Sdelphij ((struct ossl_gost_imit_ctx *)(ctx->md_data))->key_set = 1; 604296341Sdelphij return 1; 605238384Sjkim 606296341Sdelphij } 607296341Sdelphij default: 608296341Sdelphij return 0; 609296341Sdelphij } 610296341Sdelphij} 611238384Sjkim 612296341Sdelphijint gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from) 613296341Sdelphij{ 614296341Sdelphij memcpy(to->md_data, from->md_data, sizeof(struct ossl_gost_imit_ctx)); 615296341Sdelphij return 1; 616296341Sdelphij} 617238384Sjkim 618238384Sjkim/* Clean up imit ctx */ 619238384Sjkimint gost_imit_cleanup(EVP_MD_CTX *ctx) 620296341Sdelphij{ 621296341Sdelphij memset(ctx->md_data, 0, sizeof(struct ossl_gost_imit_ctx)); 622296341Sdelphij return 1; 623296341Sdelphij} 624