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/**********************************************************************
* 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/rand.h>
#include "e_gost_err.h"
#include "gost_lcl.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);
EVP_CIPHER cipher_gost =
{
NID_id_Gost28147_89,
1,/*block_size*/
32,/*key_size*/
8,/*iv_len */
EVP_CIPH_CFB_MODE| EVP_CIPH_NO_PADDING |
EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
gost_cipher_init,
gost_cipher_do_cfb,
gost_cipher_cleanup,
sizeof(struct ossl_gost_cipher_ctx),/* ctx_size */
gost89_set_asn1_parameters,
gost89_get_asn1_parameters,
gost_cipher_ctl,
NULL,
};
EVP_CIPHER cipher_gost_cpacnt =
{
NID_gost89_cnt,
1,/*block_size*/
32,/*key_size*/
8,/*iv_len */
EVP_CIPH_OFB_MODE| EVP_CIPH_NO_PADDING |
EVP_CIPH_CUSTOM_IV| EVP_CIPH_RAND_KEY | EVP_CIPH_ALWAYS_CALL_INIT,
gost_cipher_init_cpa,
gost_cipher_do_cnt,
gost_cipher_cleanup,
sizeof(struct ossl_gost_cipher_ctx), /* ctx_size */
gost89_set_asn1_parameters,
gost89_get_asn1_parameters,
gost_cipher_ctl,
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);
EVP_MD imit_gost_cpa =
{
NID_id_Gost28147_89_MAC,
NID_undef,
4,
0,
gost_imit_init_cpa,
gost_imit_update,
gost_imit_final,
gost_imit_copy,
gost_imit_cleanup,
NULL,
NULL,
{0,0,0,0,0},
8,
sizeof(struct ossl_gost_imit_ctx),
gost_imit_ctrl
};
/*
* 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_cc,&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=ctx->cipher_data;
if (ctx->app_data == NULL)
{
if (!gost_cipher_set_param(c,paramNID)) return 0;
ctx->app_data = ctx->cipher_data;
}
if (key) gost_key(&(c->cctx),key);
if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
memcpy(ctx->iv, ctx->oiv, 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=ctx->cipher_data;
gost_init(&(c->cctx),&Gost28147_CryptoProParamSetA);
c->key_meshing=1;
c->count=0;
if(key) gost_key(&(c->cctx),key);
if(iv) memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx));
memcpy(ctx->iv, ctx->oiv, 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)|(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)|(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;
size_t i=0;
size_t j=0;
/* process partial block if any */
if (ctx->num)
{
for (j=ctx->num,i=0;j<8 && i<inl;j++,i++,in_ptr++,out_ptr++)
{
if (!ctx->encrypt) ctx->buf[j+8]=*in_ptr;
*out_ptr=ctx->buf[j]^(*in_ptr);
if (ctx->encrypt) ctx->buf[j+8]=*out_ptr;
}
if (j==8)
{
memcpy(ctx->iv,ctx->buf+8,8);
ctx->num=0;
}
else
{
ctx->num=j;
return 1;
}
}
for (;i+8<inl;i+=8,in_ptr+=8,out_ptr+=8)
{
/*block cipher current iv */
gost_crypt_mesh(ctx->cipher_data,ctx->iv,ctx->buf);
/*xor next block of input text with it and output it*/
/*output this block */
if (!ctx->encrypt) memcpy(ctx->iv,in_ptr,8);
for (j=0;j<8;j++)
{
out_ptr[j]=ctx->buf[j]^in_ptr[j];
}
/* Encrypt */
/* Next iv is next block of cipher text*/
if (ctx->encrypt) memcpy(ctx->iv,out_ptr,8);
}
/* Process rest of buffer */
if (i<inl)
{
gost_crypt_mesh(ctx->cipher_data,ctx->iv,ctx->buf);
if (!ctx->encrypt) memcpy(ctx->buf+8,in_ptr,inl-i);
for (j=0;i<inl;j++,i++)
{
out_ptr[j]=ctx->buf[j]^in_ptr[j];
}
ctx->num = j;
if (ctx->encrypt) memcpy(ctx->buf+8,out_ptr,j);
}
else
{
ctx->num = 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;
size_t i=0;
size_t j;
/* process partial block if any */
if (ctx->num)
{
for (j=ctx->num,i=0;j<8 && i<inl;j++,i++,in_ptr++,out_ptr++)
{
*out_ptr=ctx->buf[j]^(*in_ptr);
}
if (j==8)
{
ctx->num=0;
}
else
{
ctx->num=j;
return 1;
}
}
for (;i+8<inl;i+=8,in_ptr+=8,out_ptr+=8)
{
/*block cipher current iv */
/* Encrypt */
gost_cnt_next(ctx->cipher_data,ctx->iv,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]=ctx->buf[j]^in_ptr[j];
}
}
/* Process rest of buffer */
if (i<inl)
{
gost_cnt_next(ctx->cipher_data,ctx->iv,ctx->buf);
for (j=0;i<inl;j++,i++)
{
out_ptr[j]=ctx->buf[j]^in_ptr[j];
}
ctx->num = j;
}
else
{
ctx->num = 0;
}
return 1;
}
/* Cleaning up of EVP_CIPHER_CTX */
int gost_cipher_cleanup(EVP_CIPHER_CTX *ctx)
{
gost_destroy(&((struct ossl_gost_cipher_ctx *)ctx->cipher_data)->cctx);
ctx->app_data = 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,ctx->key_len)<=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 = ctx->cipher_data;
GOST_CIPHER_PARAMS *gcp = GOST_CIPHER_PARAMS_new();
ASN1_OCTET_STRING *os = NULL;
if (!gcp)
{
GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
return 0;
}
if (!ASN1_OCTET_STRING_set(gcp->iv, ctx->iv, ctx->cipher->iv_len))
{
GOST_CIPHER_PARAMS_free(gcp);
GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
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 = (unsigned char*)OPENSSL_malloc(len);
if (!buf)
{
GOST_CIPHER_PARAMS_free(gcp);
GOSTerr(GOST_F_GOST89_SET_ASN1_PARAMETERS, GOST_R_NO_MEMORY);
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, 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;
}
| .. | |||||
| Makefile | |||||
| Makefile.save | |||||
| README.gost | |||||
| e_gost_err.c | |||||
| e_gost_err.h | |||||
| e_gost_err.proto | |||||
| gost.ec | |||||
| gost2001.c | |||||
| gost2001_keyx.c | |||||
| gost2001_keyx.h | |||||
| gost89.c | |||||
| gost89.h | |||||
| gost94_keyx.c | |||||
| gost_ameth.c | |||||
| gost_asn1.c | |||||
| gost_crypt.c | |||||
| gost_ctl.c | |||||
| gost_eng.c | |||||
| gost_keywrap.c | |||||
| gost_keywrap.h | |||||
| gost_lcl.h | |||||
| gost_md.c | |||||
| gost_params.c | |||||
| gost_params.h | |||||
| gost_pmeth.c | |||||
| gost_sign.c | |||||
| gosthash.c | |||||
| gosthash.h | |||||
| gostsum.c |