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84948b39df
openssl/engines/ccgost/gost2001_keyx.c
Ben Laurie 84948b39df Fix various warnings.
2006-11-08 09:45:12 +00:00

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/**********************************************************************
* gost_keyx.c *
* Copyright (c) 2005-2006 Cryptocom LTD *
* This file is distributed under the same license as OpenSSL *
* *
* VK0 34.10-2001 key exchange and GOST R 34.10-2001 *
* based PKCS7/SMIME support *
* Requires OpenSSL 0.9.9 for compilation *
**********************************************************************/
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <string.h>
#include <openssl/objects.h>
#include "gost89.h"
#include "gosthash.h"
#include "e_gost_err.h"
#include "gost_keywrap.h"
#include "gost_lcl.h"
#include "gost2001_keyx.h"
/* Transform ECDH shared key into little endian as required by Cryptocom
* key exchange */
static void *make_key_le(const void *in, size_t inlen, void *out, size_t *outlen)
{
const char* inbuf= in;
char* outbuf= out;
int i;
if (*outlen < inlen)
{
return NULL;
}
for (i=0;i<inlen;i++)
{
outbuf[inlen-1-i]=inbuf[i];
}
*outlen = inlen;
return out;
}
/* Create gost 2001 ephemeral key with same parameters as peer key */
static EC_KEY *make_ec_ephemeral_key(EC_KEY *peer_key,BIGNUM *seckey)
{
EC_KEY *out = EC_KEY_new();
EC_KEY_copy(out,peer_key);
EC_KEY_set_private_key(out,seckey);
gost2001_compute_public(out);
return out;
}
/* Packs GOST elliptic curve key into EVP_PKEY setting same parameters
* as in passed pubkey
*/
static EVP_PKEY *ec_ephemeral_key_to_EVP(EVP_PKEY *pubk,int type,EC_KEY *ephemeral)
{
EVP_PKEY *newkey;
newkey = EVP_PKEY_new();
EVP_PKEY_assign(newkey,type,ephemeral);
return newkey;
}
/*
* EVP_PKEY_METHOD callback encrypt
* Implementation of GOST2001 key transport, cryptocom variation
*/
int pkey_GOST01cc_encrypt (EVP_PKEY_CTX *pctx,unsigned char *out,
size_t *out_len, const unsigned char *key,size_t key_len)
{
EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
GOST_KEY_TRANSPORT *gkt = NULL;
int ret=0;
gost_ctx ctx;
EC_KEY *ephemeral=NULL;
const EC_POINT *pub_key_point=NULL;
unsigned char shared_key[32],encrypted_key[32],hmac[4],
iv[8]={0,0,0,0,0,0,0,0};
ephemeral = make_ec_ephemeral_key(EVP_PKEY_get0(pubk), gost_get_priv_key(data->eph_seckey));
if (!ephemeral) goto err;
/* compute shared key */
pub_key_point=EC_KEY_get0_public_key(EVP_PKEY_get0(pubk));
if (!ECDH_compute_key(shared_key,32,pub_key_point,ephemeral,make_key_le))
{
GOSTerr(GOST_F_PKEY_GOST01CC_ENCRYPT,GOST_R_ERROR_COMPUTING_SHARED_KEY);
goto err;
}
/* encrypt session key */
gost_init(&ctx, &GostR3411_94_CryptoProParamSet);
gost_key(&ctx,shared_key);
encrypt_cryptocom_key(key,key_len,encrypted_key,&ctx);
/* compute hmac of session key */
if (!gost_mac(&ctx,32,key,32,hmac))
{
GOSTerr(GOST_F_PKEY_GOST01CC_ENCRYPT,GOST_R_ERROR_COMPUTING_MAC);
return -1;
}
gkt = GOST_KEY_TRANSPORT_new();
if (!gkt)
{
GOSTerr(GOST_F_PKEY_GOST01CC_ENCRYPT,GOST_R_NO_MEMORY);
return -1;
}
/* Store IV which is always zero in our case */
if (!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv,iv,8))
{
GOSTerr(GOST_F_PKEY_GOST01CC_ENCRYPT,GOST_R_ERROR_STORING_IV);
goto err;
}
if (!ASN1_OCTET_STRING_set(gkt->key_info->imit,hmac,4))
{
GOSTerr(GOST_F_PKEY_GOST01CC_ENCRYPT,GOST_R_ERROR_STORING_MAC);
goto err;
}
if (!ASN1_OCTET_STRING_set(gkt->key_info->encrypted_key,encrypted_key,32))
{
GOSTerr(GOST_F_PKEY_GOST01CC_ENCRYPT,GOST_R_ERROR_STORING_ENCRYPTED_KEY);
goto err;
}
if (!X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,data->eph_seckey))
{
GOSTerr(GOST_F_PKEY_GOST01CC_ENCRYPT,GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
goto err;
}
ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
gkt->key_agreement_info->cipher = OBJ_nid2obj(NID_id_Gost28147_89_cc);
if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt,&out))>0) ret = 1;
;
err:
if (gkt) GOST_KEY_TRANSPORT_free(gkt);
return ret;
}
/*
* EVP_PKEY_METHOD callback decrypt
* Implementation of GOST2001 key transport, cryptocom variation
*/
int pkey_GOST01cc_decrypt (EVP_PKEY_CTX *pctx, unsigned char *key, size_t *key_len, const unsigned char *in, size_t in_len)
{
/* Form DH params from compute shared key */
EVP_PKEY *priv=EVP_PKEY_CTX_get0_pkey(pctx);
GOST_KEY_TRANSPORT *gkt = NULL;
const unsigned char *p=in;
unsigned char shared_key[32];
unsigned char hmac[4],hmac_comp[4];
unsigned char iv[8];
int i;
gost_ctx ctx;
const EC_POINT *pub_key_point;
EVP_PKEY *eph_key;
if (!key)
{
*key_len = 32;
return 1;
}
/* Parse passed octet string and find out public key, iv and HMAC*/
gkt = d2i_GOST_KEY_TRANSPORT(NULL,(const unsigned char **)&p,
in_len);
if (!gkt)
{
GOSTerr(GOST_F_PKEY_GOST01CC_DECRYPT,GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
return 0;
}
eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
/* Initialization vector is really ignored here */
OPENSSL_assert(gkt->key_agreement_info->eph_iv->length==8);
memcpy(iv,gkt->key_agreement_info->eph_iv->data,8);
/* HMAC should be computed and checked */
OPENSSL_assert(gkt->key_info->imit->length==4);
memcpy(hmac,gkt->key_info->imit->data,4);
/* Compute shared key */
pub_key_point=EC_KEY_get0_public_key(EVP_PKEY_get0(eph_key));
i=ECDH_compute_key(shared_key,32,pub_key_point,EVP_PKEY_get0(priv),make_key_le);
EVP_PKEY_free(eph_key);
if (!i)
{
GOSTerr(GOST_F_PKEY_GOST01CC_DECRYPT,GOST_R_ERROR_COMPUTING_SHARED_KEY);
GOST_KEY_TRANSPORT_free(gkt);
return 0;
}
/* Decrypt session key */
gost_init(&ctx, &GostR3411_94_CryptoProParamSet);
gost_key(&ctx,shared_key);
if (!decrypt_cryptocom_key(key,*key_len,gkt->key_info->encrypted_key->data,
gkt->key_info->encrypted_key->length, &ctx))
{
GOST_KEY_TRANSPORT_free(gkt);
return 0;
}
GOST_KEY_TRANSPORT_free(gkt);
/* check HMAC of session key*/
if (!gost_mac(&ctx,32,key,32,hmac_comp))
{
GOSTerr(GOST_F_PKEY_GOST01CC_DECRYPT,GOST_R_ERROR_COMPUTING_MAC);
return 0;
}
/* HMAC of session key is not correct */
if (memcmp(hmac,hmac_comp,4)!=0)
{
GOSTerr(GOST_F_PKEY_GOST01CC_DECRYPT,GOST_R_SESSION_KEY_MAC_DOES_NOT_MATCH);
return 0;
}
return 1;
}
/* Implementation of CryptoPro VKO 34.10-2001 algorithm */
static int VKO_compute_key(unsigned char *shared_key,size_t shared_key_size,const EC_POINT *pub_key,EC_KEY *priv_key,const unsigned char *ukm)
{
unsigned char ukm_be[8],databuf[64],hashbuf[64];
BIGNUM *UKM=NULL,*p=NULL,*order=NULL,*X=NULL,*Y=NULL;
const BIGNUM* key=EC_KEY_get0_private_key(priv_key);
EC_POINT *pnt=EC_POINT_new(EC_KEY_get0_group(priv_key));
int i;
gost_hash_ctx hash_ctx;
BN_CTX *ctx = BN_CTX_new();
for (i=0;i<8;i++)
{
ukm_be[7-i]=ukm[i];
}
BN_CTX_start(ctx);
UKM=getbnfrombuf(ukm_be,8);
p=BN_CTX_get(ctx);
order = BN_CTX_get(ctx);
X=BN_CTX_get(ctx);
Y=BN_CTX_get(ctx);
EC_GROUP_get_order(EC_KEY_get0_group(priv_key),order,ctx);
BN_mod_mul(p,key,UKM,order,ctx);
EC_POINT_mul(EC_KEY_get0_group(priv_key),pnt,NULL,pub_key,p,ctx);
EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(priv_key),
pnt,X,Y,ctx);
/*Serialize elliptic curve point same way as we do it when saving
* key */
store_bignum(Y,databuf,32);
store_bignum(X,databuf+32,32);
/* And reverse byte order of whole buffer */
for (i=0;i<64;i++)
{
hashbuf[63-i]=databuf[i];
}
init_gost_hash_ctx(&hash_ctx,&GostR3411_94_CryptoProParamSet);
start_hash(&hash_ctx);
hash_block(&hash_ctx,hashbuf,64);
finish_hash(&hash_ctx,shared_key);
done_gost_hash_ctx(&hash_ctx);
BN_free(UKM);
BN_CTX_end(ctx);
BN_CTX_free(ctx);
EC_POINT_free(pnt);
return 32;
}
/* Generates ephemeral key based on pubk algorithm
* computes shared key using VKO and returns filled up
* GOST_KEY_TRANSPORT structure
*/
/* Public, because it would be needed in SSL implementation */
GOST_KEY_TRANSPORT *make_rfc4490_keytransport_2001(EVP_PKEY *pubk,BIGNUM *eph_key,
const unsigned char *key,size_t keylen, unsigned char *ukm,
size_t ukm_len)
{
const struct gost_cipher_info *param=get_encryption_params(NULL);
EC_KEY *ephemeral = NULL;
GOST_KEY_TRANSPORT *gkt=NULL;
const EC_POINT *pub_key_point = EC_KEY_get0_public_key(EVP_PKEY_get0(pubk));
unsigned char shared_key[32],crypted_key[44];
gost_ctx ctx;
EVP_PKEY *newkey=NULL;
/* Do not use vizir cipher parameters with cryptopro */
if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS) && param == gost_cipher_list)
{
param= gost_cipher_list+1;
}
ephemeral = make_ec_ephemeral_key(EVP_PKEY_get0(pubk),eph_key);
VKO_compute_key(shared_key,32,pub_key_point,ephemeral,ukm);
gost_init(&ctx,param->sblock);
keyWrapCryptoPro(&ctx,shared_key,ukm,key,crypted_key);
gkt = GOST_KEY_TRANSPORT_new();
if (!gkt)
{
goto memerr;
}
if(!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv,
ukm,8))
{
goto memerr;
}
if (!ASN1_OCTET_STRING_set(gkt->key_info->imit,crypted_key+40,4))
{
goto memerr;
}
if (!ASN1_OCTET_STRING_set(gkt->key_info->encrypted_key,crypted_key+8,32))
{
goto memerr;
}
newkey = ec_ephemeral_key_to_EVP(pubk,NID_id_GostR3410_2001,ephemeral);
if (!X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,newkey))
{
GOSTerr(GOST_F_MAKE_RFC4490_KEYTRANSPORT_2001,GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
goto err;
}
ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
EVP_PKEY_free(newkey);
return gkt;
memerr:
GOSTerr(GOST_F_MAKE_RFC4490_KEYTRANSPORT_2001,
GOST_R_MALLOC_FAILURE);
err:
GOST_KEY_TRANSPORT_free(gkt);
return NULL;
}
/*
* EVP_PKEY_METHOD callback encrypt
* Implementation of GOST2001 key transport, cryptopo variation
*/
int pkey_GOST01cp_encrypt (EVP_PKEY_CTX *pctx, unsigned char *out, size_t *out_len, const unsigned char *key,size_t key_len)
{
GOST_KEY_TRANSPORT *gkt=NULL;
EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
unsigned char ukm[8];
int ret=0;
if (RAND_bytes(ukm,8)<=0)
{
GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
GOST_R_RANDOM_GENERATOR_FAILURE);
return 0;
}
if (!(gkt=make_rfc4490_keytransport_2001(pubk,gost_get_priv_key(data->eph_seckey),key, key_len,ukm,8)))
{
goto err;
}
if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt,&out))>0) ret =1;
GOST_KEY_TRANSPORT_free(gkt);
return ret;
err:
GOST_KEY_TRANSPORT_free(gkt);
return -1;
}
/* Public, because it would be needed in SSL implementation */
int decrypt_rfc4490_shared_key_2001(EVP_PKEY *priv,GOST_KEY_TRANSPORT *gkt,
unsigned char *key_buf,int key_buf_len)
{
unsigned char wrappedKey[44];
unsigned char sharedKey[32];
gost_ctx ctx;
const struct gost_cipher_info *param=NULL;
EVP_PKEY *eph_key=NULL;
eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
param = get_encryption_params(gkt->key_agreement_info->cipher);
gost_init(&ctx,param->sblock);
OPENSSL_assert(gkt->key_agreement_info->eph_iv->length==8);
memcpy(wrappedKey,gkt->key_agreement_info->eph_iv->data,8);
OPENSSL_assert(gkt->key_info->encrypted_key->length==32);
memcpy(wrappedKey+8,gkt->key_info->encrypted_key->data,32);
OPENSSL_assert(gkt->key_info->imit->length==4);
memcpy(wrappedKey+40,gkt->key_info->imit->data,4);
VKO_compute_key(sharedKey,32,EC_KEY_get0_public_key(EVP_PKEY_get0(eph_key)),
EVP_PKEY_get0(priv),wrappedKey);
if (!keyUnwrapCryptoPro(&ctx,sharedKey,wrappedKey,key_buf))
{
GOSTerr(GOST_F_PKCS7_GOST94CP_KEY_TRANSPORT_DECRYPT,
GOST_R_ERROR_COMPUTING_SHARED_KEY);
goto err;
}
EVP_PKEY_free(eph_key);
return 32;
err:
EVP_PKEY_free(eph_key);
return -1;
}
/*
* EVP_PKEY_METHOD callback decrypt
* Implementation of GOST2001 key transport, cryptopo variation
*/
int pkey_GOST01cp_decrypt (EVP_PKEY_CTX *pctx, unsigned char *key, size_t * key_len, const unsigned char *in, size_t in_len)
{
const unsigned char *p = in;
EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(pctx);
GOST_KEY_TRANSPORT *gkt = NULL;
int ret=0;
if (!key)
{
*key_len = 32;
return 1;
}
gkt = d2i_GOST_KEY_TRANSPORT(NULL,(const unsigned char **)&p,
in_len);
if (!gkt)
{
GOSTerr(GOST_F_PKCS7_GOST94CP_KEY_TRANSPORT_DECRYPT,GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
return -1;
}
ret = decrypt_rfc4490_shared_key_2001(priv,gkt,key,*key_len);
GOST_KEY_TRANSPORT_free(gkt);
return ret;
}
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