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635 lines
16 KiB
C
635 lines
16 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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{
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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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{
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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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{
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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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{
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/* NID */ /* Subst block */ /* Key meshing*/
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/*{NID_id_GostR3411_94_CryptoProParamSet,&GostR3411_94_CryptoProParamSet,0},*/
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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,1},
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{NID_id_Gost28147_89_CryptoPro_B_ParamSet,&Gost28147_CryptoProParamSetB,1},
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{NID_id_Gost28147_89_CryptoPro_C_ParamSet,&Gost28147_CryptoProParamSetC,1},
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{NID_id_Gost28147_89_CryptoPro_D_ParamSet,&Gost28147_CryptoProParamSetD,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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/* get encryption parameters from crypto network settings
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FIXME For now we use environment var CRYPT_PARAMS as place to
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store these settings. Actually, it is better to use engine control command, read from configuration file to set them */
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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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{
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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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{
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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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}
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else
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{
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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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{
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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=get_encryption_params((nid==NID_undef?NULL:OBJ_nid2obj(nid)));
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if (!param) 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, const unsigned char *key,
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const unsigned char *iv, int enc, 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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{
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if (!gost_cipher_set_param(c,paramNID)) return 0;
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ctx->app_data = ctx->cipher_data;
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}
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if (key) gost_key(&(c->cctx),key);
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if(iv) 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) gost_key(&(c->cctx),key);
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if(iv) 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,EVP_CIPH_CFB_MODE);
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}
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/* Wrapper around gostcrypt function from gost89.c which perform
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* key meshing 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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{
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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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{
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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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{
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gostcrypt(&(c->cctx),iv,buf1);
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}
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else
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{
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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)|((word32)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)|((word32)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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{
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for (j=ctx->num,i=0;j<8 && i<inl;j++,i++,in_ptr++,out_ptr++)
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{
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if (!ctx->encrypt) ctx->buf[j+8]=*in_ptr;
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*out_ptr=ctx->buf[j]^(*in_ptr);
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if (ctx->encrypt) ctx->buf[j+8]=*out_ptr;
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}
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if (j==8)
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{
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memcpy(ctx->iv,ctx->buf+8,8);
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ctx->num=0;
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}
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else
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{
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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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gost_crypt_mesh(ctx->cipher_data,ctx->iv,ctx->buf);
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/*xor next block of input text with it and output it*/
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/*output this block */
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if (!ctx->encrypt) memcpy(ctx->iv,in_ptr,8);
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for (j=0;j<8;j++)
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{
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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) 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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{
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gost_crypt_mesh(ctx->cipher_data,ctx->iv,ctx->buf);
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if (!ctx->encrypt) memcpy(ctx->buf+8,in_ptr,inl-i);
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for (j=0;i<inl;j++,i++)
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{
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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) memcpy(ctx->buf+8,out_ptr,j);
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}
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else
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{
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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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{
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for (j=ctx->num,i=0;j<8 && i<inl;j++,i++,in_ptr++,out_ptr++)
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{
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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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{
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ctx->num=0;
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}
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else
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{
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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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/* Encrypt */
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gost_cnt_next(ctx->cipher_data,ctx->iv,ctx->buf);
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/*xor next block of input text with it and output it*/
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/*output this block */
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for (j=0;j<8;j++)
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{
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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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{
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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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{
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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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}
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else
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{
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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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/* 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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/* 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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{
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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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{
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GOSTerr(GOST_F_GOST_CIPHER_CTL,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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default:
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GOSTerr(GOST_F_GOST_CIPHER_CTL,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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{
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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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{
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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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{
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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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}
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ASN1_OBJECT_free(gcp->enc_param_set);
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gcp->enc_param_set = OBJ_nid2obj(c->paramNID);
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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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{
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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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}
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i2d_GOST_CIPHER_PARAMS(gcp, &p);
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GOST_CIPHER_PARAMS_free(gcp);
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os = ASN1_OCTET_STRING_new();
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if(!os || !ASN1_OCTET_STRING_set(os, buf, len))
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{
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OPENSSL_free(buf);
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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;
|
|
}
|
|
|