diff options
Diffstat (limited to 'engines/ccgost/gost_crypt.c')
| -rw-r--r-- | engines/ccgost/gost_crypt.c | 699 |
1 files changed, 0 insertions, 699 deletions
diff --git a/engines/ccgost/gost_crypt.c b/engines/ccgost/gost_crypt.c deleted file mode 100644 index 63009a23d1..0000000000 --- a/engines/ccgost/gost_crypt.c +++ /dev/null @@ -1,699 +0,0 @@ -/********************************************************************** - * gost_crypt.c * - * Copyright (c) 2005-2006 Cryptocom LTD * - * This file is distributed under the same license as OpenSSL * - * * - * OpenSSL interface to GOST 28147-89 cipher functions * - * Requires OpenSSL 0.9.9 for compilation * - **********************************************************************/ -#include <string.h> -#include "gost89.h" -#include <openssl/err.h> -#include <openssl/rand.h> -#include "e_gost_err.h" -#include "gost_lcl.h" -#include <openssl/evp.h> - -#if !defined(CCGOST_DEBUG) && !defined(DEBUG) -# ifndef NDEBUG -# define NDEBUG -# endif -#endif -#include <assert.h> - -static int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, - const unsigned char *iv, int enc); -static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key, - const unsigned char *iv, int enc); -/* Handles block of data in CFB mode */ -static int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out, - const unsigned char *in, size_t inl); -/* Handles block of data in CNT mode */ -static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out, - const unsigned char *in, size_t inl); -/* Cleanup function */ -static int gost_cipher_cleanup(EVP_CIPHER_CTX *); -/* set/get cipher parameters */ -static int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params); -static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params); -/* Control function */ -static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr); - -static EVP_CIPHER *_hidden_Gost28147_89_cipher = NULL; -const EVP_CIPHER *cipher_gost(void) -{ - if (_hidden_Gost28147_89_cipher == NULL - && ((_hidden_Gost28147_89_cipher = - EVP_CIPHER_meth_new(NID_id_Gost28147_89, - 1 /* block_size */, - 32 /* key_size */)) == NULL - || !EVP_CIPHER_meth_set_iv_length(_hidden_Gost28147_89_cipher, 8) - || !EVP_CIPHER_meth_set_flags(_hidden_Gost28147_89_cipher, - EVP_CIPH_CFB_MODE | - EVP_CIPH_NO_PADDING | - EVP_CIPH_CUSTOM_IV | - EVP_CIPH_RAND_KEY | - EVP_CIPH_ALWAYS_CALL_INIT) - || !EVP_CIPHER_meth_set_init(_hidden_Gost28147_89_cipher, - gost_cipher_init) - || !EVP_CIPHER_meth_set_do_cipher(_hidden_Gost28147_89_cipher, - gost_cipher_do_cfb) - || !EVP_CIPHER_meth_set_cleanup(_hidden_Gost28147_89_cipher, - gost_cipher_cleanup) - || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_Gost28147_89_cipher, - sizeof(struct ossl_gost_cipher_ctx)) - || !EVP_CIPHER_meth_set_set_asn1_params(_hidden_Gost28147_89_cipher, - gost89_set_asn1_parameters) - || !EVP_CIPHER_meth_set_get_asn1_params(_hidden_Gost28147_89_cipher, - gost89_get_asn1_parameters) - || !EVP_CIPHER_meth_set_ctrl(_hidden_Gost28147_89_cipher, - gost_cipher_ctl))) { - EVP_CIPHER_meth_free(_hidden_Gost28147_89_cipher); - _hidden_Gost28147_89_cipher = NULL; - } - return _hidden_Gost28147_89_cipher; -} - -static EVP_CIPHER *_hidden_gost89_cnt = NULL; -const EVP_CIPHER *cipher_gost_cpacnt(void) -{ - if (_hidden_gost89_cnt == NULL - && ((_hidden_gost89_cnt = - EVP_CIPHER_meth_new(NID_gost89_cnt, - 1 /* block_size */, - 32 /* key_size */)) == NULL - || !EVP_CIPHER_meth_set_iv_length(_hidden_gost89_cnt, 8) - || !EVP_CIPHER_meth_set_flags(_hidden_gost89_cnt, - EVP_CIPH_OFB_MODE | - EVP_CIPH_NO_PADDING | - EVP_CIPH_CUSTOM_IV | - EVP_CIPH_RAND_KEY | - EVP_CIPH_ALWAYS_CALL_INIT) - || !EVP_CIPHER_meth_set_init(_hidden_gost89_cnt, - gost_cipher_init_cpa) - || !EVP_CIPHER_meth_set_do_cipher(_hidden_gost89_cnt, - gost_cipher_do_cnt) - || !EVP_CIPHER_meth_set_cleanup(_hidden_gost89_cnt, - gost_cipher_cleanup) - || !EVP_CIPHER_meth_set_impl_ctx_size(_hidden_gost89_cnt, - sizeof(struct ossl_gost_cipher_ctx)) - || !EVP_CIPHER_meth_set_set_asn1_params(_hidden_gost89_cnt, - gost89_set_asn1_parameters) - || !EVP_CIPHER_meth_set_get_asn1_params(_hidden_gost89_cnt, - gost89_get_asn1_parameters) - || !EVP_CIPHER_meth_set_ctrl(_hidden_gost89_cnt, - gost_cipher_ctl))) { - EVP_CIPHER_meth_free(_hidden_gost89_cnt); - _hidden_gost89_cnt = NULL; - } - return _hidden_gost89_cnt; -} - -void cipher_gost_destroy(void) -{ - EVP_CIPHER_meth_free(_hidden_Gost28147_89_cipher); - _hidden_Gost28147_89_cipher = NULL; - EVP_CIPHER_meth_free(_hidden_gost89_cnt); - _hidden_gost89_cnt = NULL; -} - -/* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */ -/* Init functions which set specific parameters */ -static int gost_imit_init_cpa(EVP_MD_CTX *ctx); -/* process block of data */ -static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count); -/* Return computed value */ -static int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md); -/* Copies context */ -static int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from); -static int gost_imit_cleanup(EVP_MD_CTX *ctx); -/* Control function, knows how to set MAC key.*/ -static int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr); - -static EVP_MD *_hidden_Gost28147_89_MAC_md = NULL; -const EVP_MD *imit_gost_cpa(void) -{ - - if (_hidden_Gost28147_89_MAC_md == NULL) { - EVP_MD *md; - - if ((md = EVP_MD_meth_new(NID_id_Gost28147_89_MAC, NID_undef)) == NULL - || !EVP_MD_meth_set_result_size(md, 4) - || !EVP_MD_meth_set_input_blocksize(md, 8) - || !EVP_MD_meth_set_app_datasize(md, - sizeof(struct ossl_gost_imit_ctx)) - || !EVP_MD_meth_set_flags(md, 0) - || !EVP_MD_meth_set_init(md, gost_imit_init_cpa) - || !EVP_MD_meth_set_update(md, gost_imit_update) - || !EVP_MD_meth_set_final(md, gost_imit_final) - || !EVP_MD_meth_set_copy(md, gost_imit_copy) - || !EVP_MD_meth_set_cleanup(md, gost_imit_cleanup) - || !EVP_MD_meth_set_ctrl(md, gost_imit_ctrl)) { - EVP_MD_meth_free(md); - md = NULL; - } - _hidden_Gost28147_89_MAC_md = md; - } - return _hidden_Gost28147_89_MAC_md; -} -void imit_gost_cpa_destroy(void) -{ - EVP_MD_meth_free(_hidden_Gost28147_89_MAC_md); - _hidden_Gost28147_89_MAC_md = NULL; -} - -/* - * Correspondence between gost parameter OIDs and substitution blocks - * NID field is filed by register_gost_NID function in engine.c - * upon engine initialization - */ - -struct gost_cipher_info gost_cipher_list[] = { - /*- NID *//* - * Subst block - *//* - * Key meshing - */ - /* - * {NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0}, - */ - {NID_id_Gost28147_89_CryptoPro_A_ParamSet, &Gost28147_CryptoProParamSetA, - 1}, - {NID_id_Gost28147_89_CryptoPro_B_ParamSet, &Gost28147_CryptoProParamSetB, - 1}, - {NID_id_Gost28147_89_CryptoPro_C_ParamSet, &Gost28147_CryptoProParamSetC, - 1}, - {NID_id_Gost28147_89_CryptoPro_D_ParamSet, &Gost28147_CryptoProParamSetD, - 1}, - {NID_id_Gost28147_89_TestParamSet, &Gost28147_TestParamSet, 1}, - {NID_undef, NULL, 0} -}; - -/* - * get encryption parameters from crypto network settings FIXME For now we - * use environment var CRYPT_PARAMS as place to store these settings. - * Actually, it is better to use engine control command, read from - * configuration file to set them - */ -const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj) -{ - int nid; - struct gost_cipher_info *param; - if (!obj) { - const char *params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS); - if (!params || !strlen(params)) - return &gost_cipher_list[1]; - - nid = OBJ_txt2nid(params); - if (nid == NID_undef) { - GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, - GOST_R_INVALID_CIPHER_PARAM_OID); - return NULL; - } - } else { - nid = OBJ_obj2nid(obj); - } - for (param = gost_cipher_list; param->sblock != NULL && param->nid != nid; - param++) ; - if (!param->sblock) { - GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, GOST_R_INVALID_CIPHER_PARAMS); - return NULL; - } - return param; -} - -/* Sets cipher param from paramset NID. */ -static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c, int nid) -{ - const struct gost_cipher_info *param; - param = - get_encryption_params((nid == NID_undef ? NULL : OBJ_nid2obj(nid))); - if (!param) - return 0; - - c->paramNID = param->nid; - c->key_meshing = param->key_meshing; - c->count = 0; - gost_init(&(c->cctx), param->sblock); - return 1; -} - -/* Initializes EVP_CIPHER_CTX by paramset NID */ -static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx, - const unsigned char *key, - const unsigned char *iv, int enc, - int paramNID, int mode) -{ - struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_cipher_data(ctx); - if (EVP_CIPHER_CTX_get_app_data(ctx) == NULL) { - if (!gost_cipher_set_param(c, paramNID)) - return 0; - EVP_CIPHER_CTX_set_app_data(ctx, EVP_CIPHER_CTX_cipher_data(ctx)); - } - if (key) - gost_key(&(c->cctx), key); - if (iv) - memcpy((unsigned char *)EVP_CIPHER_CTX_original_iv(ctx), iv, - EVP_CIPHER_CTX_iv_length(ctx)); - memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), - EVP_CIPHER_CTX_original_iv(ctx), - EVP_CIPHER_CTX_iv_length(ctx)); - return 1; -} - -static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key, - const unsigned char *iv, int enc) -{ - struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_cipher_data(ctx); - gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA); - c->key_meshing = 1; - c->count = 0; - if (key) - gost_key(&(c->cctx), key); - if (iv) - memcpy((unsigned char *)EVP_CIPHER_CTX_original_iv(ctx), iv, - EVP_CIPHER_CTX_iv_length(ctx)); - memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), - EVP_CIPHER_CTX_original_iv(ctx), - EVP_CIPHER_CTX_iv_length(ctx)); - return 1; -} - -/* Initializes EVP_CIPHER_CTX with default values */ -int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key, - const unsigned char *iv, int enc) -{ - return gost_cipher_init_param(ctx, key, iv, enc, NID_undef, - EVP_CIPH_CFB_MODE); -} - -/* - * Wrapper around gostcrypt function from gost89.c which perform key meshing - * when nesseccary - */ -static void gost_crypt_mesh(void *ctx, unsigned char *iv, unsigned char *buf) -{ - struct ossl_gost_cipher_ctx *c = ctx; - assert(c->count % 8 == 0 && c->count <= 1024); - if (c->key_meshing && c->count == 1024) { - cryptopro_key_meshing(&(c->cctx), iv); - } - gostcrypt(&(c->cctx), iv, buf); - c->count = c->count % 1024 + 8; -} - -static void gost_cnt_next(void *ctx, unsigned char *iv, unsigned char *buf) -{ - struct ossl_gost_cipher_ctx *c = ctx; - word32 g, go; - unsigned char buf1[8]; - assert(c->count % 8 == 0 && c->count <= 1024); - if (c->key_meshing && c->count == 1024) { - cryptopro_key_meshing(&(c->cctx), iv); - } - if (c->count == 0) { - gostcrypt(&(c->cctx), iv, buf1); - } else { - memcpy(buf1, iv, 8); - } - g = buf1[0] | (buf1[1] << 8) | (buf1[2] << 16) | ((word32) buf1[3] << 24); - g += 0x01010101; - buf1[0] = (unsigned char)(g & 0xff); - buf1[1] = (unsigned char)((g >> 8) & 0xff); - buf1[2] = (unsigned char)((g >> 16) & 0xff); - buf1[3] = (unsigned char)((g >> 24) & 0xff); - g = buf1[4] | (buf1[5] << 8) | (buf1[6] << 16) | ((word32) buf1[7] << 24); - go = g; - g += 0x01010104; - if (go > g) /* overflow */ - g++; - buf1[4] = (unsigned char)(g & 0xff); - buf1[5] = (unsigned char)((g >> 8) & 0xff); - buf1[6] = (unsigned char)((g >> 16) & 0xff); - buf1[7] = (unsigned char)((g >> 24) & 0xff); - memcpy(iv, buf1, 8); - gostcrypt(&(c->cctx), buf1, buf); - c->count = c->count % 1024 + 8; -} - -/* GOST encryption in CFB mode */ -int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out, - const unsigned char *in, size_t inl) -{ - const unsigned char *in_ptr = in; - unsigned char *out_ptr = out; - unsigned char *buf = EVP_CIPHER_CTX_buf_noconst(ctx); - size_t i = 0; - size_t j = 0; -/* process partial block if any */ - if (EVP_CIPHER_CTX_num(ctx)) { - for (j = EVP_CIPHER_CTX_num(ctx), i = 0; j < 8 && i < inl; - j++, i++, in_ptr++, out_ptr++) { - if (!EVP_CIPHER_CTX_encrypting(ctx)) - buf[j + 8] = *in_ptr; - *out_ptr = buf[j] ^ (*in_ptr); - if (EVP_CIPHER_CTX_encrypting(ctx)) - buf[j + 8] = *out_ptr; - } - if (j == 8) { - memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), buf + 8, 8); - EVP_CIPHER_CTX_set_num(ctx, 0); - } else { - EVP_CIPHER_CTX_set_num(ctx, j); - return 1; - } - } - - for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) { - /* - * block cipher current iv - */ - gost_crypt_mesh(EVP_CIPHER_CTX_cipher_data(ctx), - EVP_CIPHER_CTX_iv_noconst(ctx), buf); - /* - * xor next block of input text with it and output it - */ - /* - * output this block - */ - if (!EVP_CIPHER_CTX_encrypting(ctx)) - memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), in_ptr, 8); - for (j = 0; j < 8; j++) { - out_ptr[j] = buf[j] ^ in_ptr[j]; - } - /* Encrypt */ - /* Next iv is next block of cipher text */ - if (EVP_CIPHER_CTX_encrypting(ctx)) - memcpy(EVP_CIPHER_CTX_iv_noconst(ctx), out_ptr, 8); - } -/* Process rest of buffer */ - if (i < inl) { - gost_crypt_mesh(EVP_CIPHER_CTX_cipher_data(ctx), - EVP_CIPHER_CTX_iv_noconst(ctx), buf); - if (!EVP_CIPHER_CTX_encrypting(ctx)) - memcpy(buf + 8, in_ptr, inl - i); - for (j = 0; i < inl; j++, i++) { - out_ptr[j] = buf[j] ^ in_ptr[j]; - } - EVP_CIPHER_CTX_set_num(ctx, j); - if (EVP_CIPHER_CTX_encrypting(ctx)) - memcpy(buf + 8, out_ptr, j); - } else { - EVP_CIPHER_CTX_set_num(ctx, 0); - } - return 1; -} - -static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out, - const unsigned char *in, size_t inl) -{ - const unsigned char *in_ptr = in; - unsigned char *out_ptr = out; - unsigned char *buf = EVP_CIPHER_CTX_buf_noconst(ctx); - size_t i = 0; - size_t j; -/* process partial block if any */ - if (EVP_CIPHER_CTX_num(ctx)) { - for (j = EVP_CIPHER_CTX_num(ctx), i = 0; j < 8 && i < inl; - j++, i++, in_ptr++, out_ptr++) { - *out_ptr = buf[j] ^ (*in_ptr); - } - if (j == 8) { - EVP_CIPHER_CTX_set_num(ctx, 0); - } else { - EVP_CIPHER_CTX_set_num(ctx, j); - return 1; - } - } - - for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) { - /* - * block cipher current iv - */ - /* Encrypt */ - gost_cnt_next(EVP_CIPHER_CTX_cipher_data(ctx), - EVP_CIPHER_CTX_iv_noconst(ctx), buf); - /* - * xor next block of input text with it and output it - */ - /* - * output this block - */ - for (j = 0; j < 8; j++) { - out_ptr[j] = buf[j] ^ in_ptr[j]; - } - } -/* Process rest of buffer */ - if (i < inl) { - gost_cnt_next(EVP_CIPHER_CTX_cipher_data(ctx), - EVP_CIPHER_CTX_iv_noconst(ctx), buf); - for (j = 0; i < inl; j++, i++) { - out_ptr[j] = buf[j] ^ in_ptr[j]; - } - EVP_CIPHER_CTX_set_num(ctx, j); - } else { - EVP_CIPHER_CTX_set_num(ctx, 0); - } - return 1; -} - -/* Cleaning up of EVP_CIPHER_CTX */ -int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx) -{ - gost_destroy(&((struct ossl_gost_cipher_ctx *) - EVP_CIPHER_CTX_cipher_data(ctx))->cctx); - EVP_CIPHER_CTX_set_app_data(ctx, NULL); - return 1; -} - -/* Control function for gost cipher */ -int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) -{ - switch (type) { - case EVP_CTRL_RAND_KEY: - { - if (RAND_bytes((unsigned char *)ptr, - EVP_CIPHER_CTX_key_length(ctx)) <= 0) { - GOSTerr(GOST_F_GOST_CIPHER_CTL, - GOST_R_RANDOM_GENERATOR_ERROR); - return -1; - } - break; - } - case EVP_CTRL_PBE_PRF_NID: - if (ptr) { - *((int *)ptr) = NID_id_HMACGostR3411_94; - return 1; - } else { - return 0; - } - - default: - GOSTerr(GOST_F_GOST_CIPHER_CTL, - GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND); - return -1; - } - return 1; -} - -/* Set cipher parameters from ASN1 structure */ -int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params) -{ - int len = 0; - unsigned char *buf = NULL; - unsigned char *p = NULL; - struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_cipher_data(ctx); - GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new(); - ASN1_OCTET_STRING *os = NULL; - if (!gcp) { - GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE); - return 0; - } - if (!ASN1_OCTET_STRING_set(gcp->iv, EVP_CIPHER_CTX_iv(ctx), - EVP_CIPHER_CTX_iv_length(ctx))) { - GOST_CIPHER_PARAMS_free(gcp); - GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE); - return 0; - } - ASN1_OBJECT_free(gcp->enc_param_set); - gcp->enc_param_set = OBJ_nid2obj(c->paramNID); - - len = i2d_GOST_CIPHER_PARAMS(gcp, NULL); - p = buf = OPENSSL_malloc(len); - if (!buf) { - GOST_CIPHER_PARAMS_free(gcp); - GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE); - return 0; - } - i2d_GOST_CIPHER_PARAMS(gcp, &p); - GOST_CIPHER_PARAMS_free(gcp); - - os = ASN1_OCTET_STRING_new(); - - if (!os || !ASN1_OCTET_STRING_set(os, buf, len)) { - OPENSSL_free(buf); - GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, ERR_R_MALLOC_FAILURE); - return 0; - } - OPENSSL_free(buf); - - ASN1_TYPE_set(params, V_ASN1_SEQUENCE, os); - return 1; -} - -/* Store parameters into ASN1 structure */ -int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params) -{ - int ret = -1; - int len; - GOST_CIPHER_PARAMS *gcp = NULL; - unsigned char *p; - struct ossl_gost_cipher_ctx *c = EVP_CIPHER_CTX_cipher_data(ctx); - if (ASN1_TYPE_get(params) != V_ASN1_SEQUENCE) { - return ret; - } - - p = params->value.sequence->data; - - gcp = d2i_GOST_CIPHER_PARAMS(NULL, (const unsigned char **)&p, - params->value.sequence->length); - - len = gcp->iv->length; - if (len != EVP_CIPHER_CTX_iv_length(ctx)) { - GOST_CIPHER_PARAMS_free(gcp); - GOSTerr(GOST_F_GOST89_GET_ASN1_PARAMETERS, GOST_R_INVALID_IV_LENGTH); - return -1; - } - if (!gost_cipher_set_param(c, OBJ_obj2nid(gcp->enc_param_set))) { - GOST_CIPHER_PARAMS_free(gcp); - return -1; - } - memcpy((unsigned char *)EVP_CIPHER_CTX_original_iv(ctx), gcp->iv->data, - EVP_CIPHER_CTX_iv_length(ctx)); - - GOST_CIPHER_PARAMS_free(gcp); - - return 1; -} - -int gost_imit_init_cpa(EVP_MD_CTX *ctx) -{ - struct ossl_gost_imit_ctx *c = EVP_MD_CTX_md_data(ctx); - memset(c->buffer, 0, sizeof(c->buffer)); - memset(c->partial_block, 0, sizeof(c->partial_block)); - c->count = 0; - c->bytes_left = 0; - c->key_meshing = 1; - gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA); - return 1; -} - -static void mac_block_mesh(struct ossl_gost_imit_ctx *c, - const unsigned char *data) -{ - unsigned char buffer[8]; - /* - * We are using local buffer for iv because CryptoPro doesn't interpret - * internal state of MAC algorithm as iv during keymeshing (but does - * initialize internal state from iv in key transport - */ - assert(c->count % 8 == 0 && c->count <= 1024); - if (c->key_meshing && c->count == 1024) { - cryptopro_key_meshing(&(c->cctx), buffer); - } - mac_block(&(c->cctx), c->buffer, data); - c->count = c->count % 1024 + 8; -} - -int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count) -{ - struct ossl_gost_imit_ctx *c = EVP_MD_CTX_md_data(ctx); - const unsigned char *p = data; - size_t bytes = count, i; - if (!(c->key_set)) { - GOSTerr(GOST_F_GOST_IMIT_UPDATE, GOST_R_MAC_KEY_NOT_SET); - return 0; - } - if (c->bytes_left) { - for (i = c->bytes_left; i < 8 && bytes > 0; bytes--, i++, p++) { - c->partial_block[i] = *p; - } - if (i == 8) { - mac_block_mesh(c, c->partial_block); - } else { - c->bytes_left = i; - return 1; - } - } - while (bytes > 8) { - mac_block_mesh(c, p); - p += 8; - bytes -= 8; - } - if (bytes > 0) { - memcpy(c->partial_block, p, bytes); - } - c->bytes_left = bytes; - return 1; -} - -int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md) -{ - struct ossl_gost_imit_ctx *c = EVP_MD_CTX_md_data(ctx); - if (!c->key_set) { - GOSTerr(GOST_F_GOST_IMIT_FINAL, GOST_R_MAC_KEY_NOT_SET); - return 0; - } - if (c->count == 0 && c->bytes_left) { - unsigned char buffer[8]; - memset(buffer, 0, 8); - gost_imit_update(ctx, buffer, 8); - } - if (c->bytes_left) { - int i; - for (i = c->bytes_left; i < 8; i++) { - c->partial_block[i] = 0; - } - mac_block_mesh(c, c->partial_block); - } - get_mac(c->buffer, 32, md); - return 1; -} - -int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr) -{ - switch (type) { - case EVP_MD_CTRL_KEY_LEN: - *((unsigned int *)(ptr)) = 32; - return 1; - case EVP_MD_CTRL_SET_KEY: - { - if (arg != 32) { - GOSTerr(GOST_F_GOST_IMIT_CTRL, GOST_R_INVALID_MAC_KEY_LENGTH); - return 0; - } - - gost_key(&(((struct ossl_gost_imit_ctx *)(EVP_MD_CTX_md_data(ctx)))->cctx), - ptr); - ((struct ossl_gost_imit_ctx *)(EVP_MD_CTX_md_data(ctx)))->key_set = 1; - return 1; - - } - default: - return 0; - } -} - -int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from) -{ - memcpy(EVP_MD_CTX_md_data(to), EVP_MD_CTX_md_data(from), - sizeof(struct ossl_gost_imit_ctx)); - return 1; -} - -/* Clean up imit ctx */ -int gost_imit_cleanup(EVP_MD_CTX *ctx) -{ - memset(EVP_MD_CTX_md_data(ctx), 0, sizeof(struct ossl_gost_imit_ctx)); - return 1; -} |