623 lines
19 KiB
C
623 lines
19 KiB
C
/**********************************************************************
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* gost_crypt.c *
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* Copyright (c) 2005-2006 Cryptocom LTD *
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* This file is distributed under the same license as OpenSSL *
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* *
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* OpenSSL interface to GOST 28147-89 cipher functions *
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* Requires OpenSSL 0.9.9 for compilation *
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**********************************************************************/
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#include <string.h>
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#include "gost89.h"
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#include <openssl/rand.h>
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#include "e_gost_err.h"
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#include "gost_lcl.h"
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#if !defined(CCGOST_DEBUG) && !defined(DEBUG)
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# ifndef NDEBUG
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# define NDEBUG
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# endif
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#endif
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#include <assert.h>
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static int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc);
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static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc);
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/* Handles block of data in CFB mode */
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static int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t inl);
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/* Handles block of data in CNT mode */
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static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t inl);
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/* Cleanup function */
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static int gost_cipher_cleanup(EVP_CIPHER_CTX *);
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/* set/get cipher parameters */
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static int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
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static int gost89_get_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params);
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/* Control function */
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static int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr);
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EVP_CIPHER cipher_gost = {
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NID_id_Gost28147_89,
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1, /* block_size */
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32, /* key_size */
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8, /* iv_len */
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EVP_CIPH_CFB_MODE | EVP_CIPH_NO_PADDING |
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EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
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gost_cipher_init,
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gost_cipher_do_cfb,
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gost_cipher_cleanup,
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sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
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gost89_set_asn1_parameters,
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gost89_get_asn1_parameters,
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gost_cipher_ctl,
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NULL,
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};
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EVP_CIPHER cipher_gost_cpacnt = {
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NID_gost89_cnt,
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1, /* block_size */
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32, /* key_size */
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8, /* iv_len */
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EVP_CIPH_OFB_MODE | EVP_CIPH_NO_PADDING |
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EVP_CIPH_CUSTOM_IV | EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
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gost_cipher_init_cpa,
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gost_cipher_do_cnt,
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gost_cipher_cleanup,
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sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
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gost89_set_asn1_parameters,
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gost89_get_asn1_parameters,
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gost_cipher_ctl,
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NULL,
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};
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/* Implementation of GOST 28147-89 in MAC (imitovstavka) mode */
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/* Init functions which set specific parameters */
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static int gost_imit_init_cpa(EVP_MD_CTX *ctx);
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/* process block of data */
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static int gost_imit_update(EVP_MD_CTX *ctx, const void *data, size_t count);
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/* Return computed value */
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static int gost_imit_final(EVP_MD_CTX *ctx, unsigned char *md);
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/* Copies context */
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static int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from);
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static int gost_imit_cleanup(EVP_MD_CTX *ctx);
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/* Control function, knows how to set MAC key.*/
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static int gost_imit_ctrl(EVP_MD_CTX *ctx, int type, int arg, void *ptr);
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EVP_MD imit_gost_cpa = {
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NID_id_Gost28147_89_MAC,
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NID_undef,
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4,
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0,
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gost_imit_init_cpa,
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gost_imit_update,
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gost_imit_final,
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gost_imit_copy,
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gost_imit_cleanup,
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NULL,
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NULL,
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{0, 0, 0, 0, 0},
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8,
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sizeof(struct ossl_gost_imit_ctx),
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gost_imit_ctrl
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};
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/*
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* Correspondence between gost parameter OIDs and substitution blocks
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* NID field is filed by register_gost_NID function in engine.c
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* upon engine initialization
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*/
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struct gost_cipher_info gost_cipher_list[] = {
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/*- NID *//*
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* Subst block
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*//*
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* Key meshing
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*/
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/*
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* {NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},
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*/
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{NID_id_Gost28147_89_cc, &GostR3411_94_CryptoProParamSet, 0},
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{NID_id_Gost28147_89_CryptoPro_A_ParamSet, &Gost28147_CryptoProParamSetA,
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1},
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{NID_id_Gost28147_89_CryptoPro_B_ParamSet, &Gost28147_CryptoProParamSetB,
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1},
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{NID_id_Gost28147_89_CryptoPro_C_ParamSet, &Gost28147_CryptoProParamSetC,
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1},
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{NID_id_Gost28147_89_CryptoPro_D_ParamSet, &Gost28147_CryptoProParamSetD,
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1},
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{NID_id_Gost28147_89_TestParamSet, &Gost28147_TestParamSet, 1},
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{NID_undef, NULL, 0}
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};
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/*
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* get encryption parameters from crypto network settings FIXME For now we
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* use environment var CRYPT_PARAMS as place to store these settings.
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* Actually, it is better to use engine control command, read from
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* configuration file to set them
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*/
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const struct gost_cipher_info *get_encryption_params(ASN1_OBJECT *obj)
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{
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int nid;
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struct gost_cipher_info *param;
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if (!obj) {
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const char *params = get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS);
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if (!params || !strlen(params))
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return &gost_cipher_list[1];
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nid = OBJ_txt2nid(params);
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if (nid == NID_undef) {
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GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS,
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GOST_R_INVALID_CIPHER_PARAM_OID);
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return NULL;
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}
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} else {
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nid = OBJ_obj2nid(obj);
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}
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for (param = gost_cipher_list; param->sblock != NULL && param->nid != nid;
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param++) ;
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if (!param->sblock) {
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GOSTerr(GOST_F_GET_ENCRYPTION_PARAMS, GOST_R_INVALID_CIPHER_PARAMS);
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return NULL;
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}
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return param;
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}
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/* Sets cipher param from paramset NID. */
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static int gost_cipher_set_param(struct ossl_gost_cipher_ctx *c, int nid)
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{
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const struct gost_cipher_info *param;
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param =
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get_encryption_params((nid == NID_undef ? NULL : OBJ_nid2obj(nid)));
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if (!param)
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return 0;
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c->paramNID = param->nid;
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c->key_meshing = param->key_meshing;
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c->count = 0;
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gost_init(&(c->cctx), param->sblock);
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return 1;
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}
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/* Initializes EVP_CIPHER_CTX by paramset NID */
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static int gost_cipher_init_param(EVP_CIPHER_CTX *ctx,
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const unsigned char *key,
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const unsigned char *iv, int enc,
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int paramNID, int mode)
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{
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struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
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if (ctx->app_data == NULL) {
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if (!gost_cipher_set_param(c, paramNID))
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return 0;
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ctx->app_data = ctx->cipher_data;
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}
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if (key)
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gost_key(&(c->cctx), key);
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if (iv)
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memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
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memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
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return 1;
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}
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static int gost_cipher_init_cpa(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc)
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{
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struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
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gost_init(&(c->cctx), &Gost28147_CryptoProParamSetA);
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c->key_meshing = 1;
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c->count = 0;
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if (key)
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gost_key(&(c->cctx), key);
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if (iv)
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memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
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memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx));
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return 1;
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}
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/* Initializes EVP_CIPHER_CTX with default values */
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int gost_cipher_init(EVP_CIPHER_CTX *ctx, const unsigned char *key,
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const unsigned char *iv, int enc)
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{
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return gost_cipher_init_param(ctx, key, iv, enc, NID_undef,
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EVP_CIPH_CFB_MODE);
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}
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/*
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* Wrapper around gostcrypt function from gost89.c which perform key meshing
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* when nesseccary
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*/
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static void gost_crypt_mesh(void *ctx, unsigned char *iv, unsigned char *buf)
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{
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struct ossl_gost_cipher_ctx *c = ctx;
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assert(c->count % 8 == 0 && c->count <= 1024);
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if (c->key_meshing && c->count == 1024) {
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cryptopro_key_meshing(&(c->cctx), iv);
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}
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gostcrypt(&(c->cctx), iv, buf);
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c->count = c->count % 1024 + 8;
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}
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static void gost_cnt_next(void *ctx, unsigned char *iv, unsigned char *buf)
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{
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struct ossl_gost_cipher_ctx *c = ctx;
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word32 g, go;
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unsigned char buf1[8];
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assert(c->count % 8 == 0 && c->count <= 1024);
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if (c->key_meshing && c->count == 1024) {
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cryptopro_key_meshing(&(c->cctx), iv);
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}
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if (c->count == 0) {
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gostcrypt(&(c->cctx), iv, buf1);
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} else {
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memcpy(buf1, iv, 8);
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}
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g = buf1[0] | (buf1[1] << 8) | (buf1[2] << 16) | (buf1[3] << 24);
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g += 0x01010101;
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buf1[0] = (unsigned char)(g & 0xff);
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buf1[1] = (unsigned char)((g >> 8) & 0xff);
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buf1[2] = (unsigned char)((g >> 16) & 0xff);
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buf1[3] = (unsigned char)((g >> 24) & 0xff);
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g = buf1[4] | (buf1[5] << 8) | (buf1[6] << 16) | (buf1[7] << 24);
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go = g;
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g += 0x01010104;
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if (go > g) /* overflow */
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g++;
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buf1[4] = (unsigned char)(g & 0xff);
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buf1[5] = (unsigned char)((g >> 8) & 0xff);
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buf1[6] = (unsigned char)((g >> 16) & 0xff);
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buf1[7] = (unsigned char)((g >> 24) & 0xff);
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memcpy(iv, buf1, 8);
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gostcrypt(&(c->cctx), buf1, buf);
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c->count = c->count % 1024 + 8;
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}
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/* GOST encryption in CFB mode */
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int gost_cipher_do_cfb(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t inl)
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{
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const unsigned char *in_ptr = in;
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unsigned char *out_ptr = out;
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size_t i = 0;
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size_t j = 0;
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/* process partial block if any */
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if (ctx->num) {
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for (j = ctx->num, i = 0; j < 8 && i < inl;
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j++, i++, in_ptr++, out_ptr++) {
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if (!ctx->encrypt)
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ctx->buf[j + 8] = *in_ptr;
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*out_ptr = ctx->buf[j] ^ (*in_ptr);
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if (ctx->encrypt)
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ctx->buf[j + 8] = *out_ptr;
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}
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if (j == 8) {
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memcpy(ctx->iv, ctx->buf + 8, 8);
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ctx->num = 0;
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} else {
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ctx->num = j;
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return 1;
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}
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}
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for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
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/*
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* block cipher current iv
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*/
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gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
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/*
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* xor next block of input text with it and output it
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*/
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/*
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* output this block
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*/
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if (!ctx->encrypt)
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memcpy(ctx->iv, in_ptr, 8);
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for (j = 0; j < 8; j++) {
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out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
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}
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/* Encrypt */
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/* Next iv is next block of cipher text */
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if (ctx->encrypt)
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memcpy(ctx->iv, out_ptr, 8);
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}
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/* Process rest of buffer */
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if (i < inl) {
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gost_crypt_mesh(ctx->cipher_data, ctx->iv, ctx->buf);
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if (!ctx->encrypt)
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memcpy(ctx->buf + 8, in_ptr, inl - i);
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for (j = 0; i < inl; j++, i++) {
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out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
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}
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ctx->num = j;
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if (ctx->encrypt)
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memcpy(ctx->buf + 8, out_ptr, j);
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} else {
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ctx->num = 0;
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}
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return 1;
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}
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static int gost_cipher_do_cnt(EVP_CIPHER_CTX *ctx, unsigned char *out,
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const unsigned char *in, size_t inl)
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{
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const unsigned char *in_ptr = in;
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unsigned char *out_ptr = out;
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size_t i = 0;
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size_t j;
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/* process partial block if any */
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if (ctx->num) {
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for (j = ctx->num, i = 0; j < 8 && i < inl;
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j++, i++, in_ptr++, out_ptr++) {
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*out_ptr = ctx->buf[j] ^ (*in_ptr);
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}
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if (j == 8) {
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ctx->num = 0;
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} else {
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ctx->num = j;
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return 1;
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}
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}
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for (; i + 8 < inl; i += 8, in_ptr += 8, out_ptr += 8) {
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/*
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* block cipher current iv
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*/
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/* Encrypt */
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gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
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/*
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* xor next block of input text with it and output it
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*/
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/*
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* output this block
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*/
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for (j = 0; j < 8; j++) {
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out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
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}
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}
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/* Process rest of buffer */
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if (i < inl) {
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gost_cnt_next(ctx->cipher_data, ctx->iv, ctx->buf);
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for (j = 0; i < inl; j++, i++) {
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out_ptr[j] = ctx->buf[j] ^ in_ptr[j];
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}
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ctx->num = j;
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} else {
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ctx->num = 0;
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}
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return 1;
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}
|
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|
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/* Cleaning up of EVP_CIPHER_CTX */
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int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
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{
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gost_destroy(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx);
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ctx->app_data = NULL;
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return 1;
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}
|
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|
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/* Control function for gost cipher */
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int gost_cipher_ctl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
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{
|
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switch (type) {
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case EVP_CTRL_RAND_KEY:
|
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{
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if (RAND_bytes((unsigned char *)ptr, ctx->key_len) <= 0) {
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GOSTerr(GOST_F_GOST_CIPHER_CTL,
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GOST_R_RANDOM_GENERATOR_ERROR);
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return -1;
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}
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break;
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}
|
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case EVP_CTRL_PBE_PRF_NID:
|
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if (ptr) {
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*((int *)ptr) = NID_id_HMACGostR3411_94;
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return 1;
|
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} else {
|
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return 0;
|
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}
|
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|
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default:
|
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GOSTerr(GOST_F_GOST_CIPHER_CTL,
|
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GOST_R_UNSUPPORTED_CIPHER_CTL_COMMAND);
|
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return -1;
|
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}
|
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return 1;
|
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}
|
|
|
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/* Set cipher parameters from ASN1 structure */
|
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int gost89_set_asn1_parameters(EVP_CIPHER_CTX *ctx, ASN1_TYPE *params)
|
|
{
|
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int len = 0;
|
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unsigned char *buf = NULL;
|
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unsigned char *p = NULL;
|
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struct ossl_gost_cipher_ctx *c = ctx->cipher_data;
|
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GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();
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ASN1_OCTET_STRING *os = NULL;
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if (!gcp) {
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GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
|
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return 0;
|
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}
|
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if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len)) {
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GOST_CIPHER_PARAMS_free(gcp);
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GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
|
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return 0;
|
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}
|
|
ASN1_OBJECT_free(gcp->enc_param_set);
|
|
gcp->enc_param_set = OBJ_nid2obj(c->paramNID);
|
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|
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len = i2d_GOST_CIPHER_PARAMS(gcp, NULL);
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p = buf = (unsigned char *)OPENSSL_malloc(len);
|
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if (!buf) {
|
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GOST_CIPHER_PARAMS_free(gcp);
|
|
GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
|
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return 0;
|
|
}
|
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i2d_GOST_CIPHER_PARAMS(gcp, &p);
|
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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, GOST_R_NO_MEMORY);
|
|
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 = ctx->cipher_data;
|
|
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 != ctx->cipher->iv_len) {
|
|
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(ctx->oiv, gcp->iv->data, len);
|
|
|
|
GOST_CIPHER_PARAMS_free(gcp);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int gost_imit_init_cpa(EVP_MD_CTX *ctx)
|
|
{
|
|
struct ossl_gost_imit_ctx *c = ctx->md_data;
|
|
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 = ctx->md_data;
|
|
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 = ctx->md_data;
|
|
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 *)(ctx->md_data))->cctx),
|
|
ptr);
|
|
((struct ossl_gost_imit_ctx *)(ctx->md_data))->key_set = 1;
|
|
return 1;
|
|
|
|
}
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
int gost_imit_copy(EVP_MD_CTX *to, const EVP_MD_CTX *from)
|
|
{
|
|
memcpy(to->md_data, from->md_data, sizeof(struct ossl_gost_imit_ctx));
|
|
return 1;
|
|
}
|
|
|
|
/* Clean up imit ctx */
|
|
int gost_imit_cleanup(EVP_MD_CTX *ctx)
|
|
{
|
|
memset(ctx->md_data, 0, sizeof(struct ossl_gost_imit_ctx));
|
|
return 1;
|
|
}
|