mirror of
https://github.com/openssl/openssl.git
synced 2024-12-09 05:51:54 +08:00
292 lines
7.7 KiB
C
292 lines
7.7 KiB
C
/**********************************************************************
|
|
* gost94_keyx.c *
|
|
* Copyright (c) 2005-2006 Cryptocom LTD *
|
|
* This file is distributed under the same license as OpenSSL *
|
|
* *
|
|
* Implements generation and parsing of GOST_KEY_TRANSPORT for *
|
|
* GOST R 34.10-94 algorithms *
|
|
* *
|
|
* Requires OpenSSL 0.9.9 for compilation *
|
|
**********************************************************************/
|
|
#include <string.h>
|
|
#include <openssl/dh.h>
|
|
#include <openssl/rand.h>
|
|
#include <openssl/evp.h>
|
|
#include <openssl/objects.h>
|
|
|
|
#include "gost89.h"
|
|
#include "gosthash.h"
|
|
#include "e_gost_err.h"
|
|
#include "gost_keywrap.h"
|
|
#include "gost_lcl.h"
|
|
/* Common functions for both 94 and 2001 key exchange schemes */
|
|
/* Implementation of the Diffi-Hellman key agreement scheme based on
|
|
* GOST-94 keys */
|
|
|
|
/* Computes Diffie-Hellman key and stores it into buffer in
|
|
* little-endian byte order as expected by both versions of GOST 94
|
|
* algorithm
|
|
*/
|
|
static int compute_pair_key_le(unsigned char *pair_key,BIGNUM *pub_key,DH *dh)
|
|
{
|
|
unsigned char be_key[128];
|
|
int i,key_size;
|
|
key_size=DH_compute_key(be_key,pub_key,dh);
|
|
if (!key_size) return 0;
|
|
memset(pair_key,0,128);
|
|
for (i=0;i<key_size;i++)
|
|
{
|
|
pair_key[i]=be_key[key_size-1-i];
|
|
}
|
|
return key_size;
|
|
}
|
|
|
|
/*
|
|
* Computes 256 bit Key exchange key as specified in RFC 4357
|
|
*/
|
|
static int make_cp_exchange_key(BIGNUM *priv_key,EVP_PKEY *pubk, unsigned char *shared_key)
|
|
{
|
|
unsigned char dh_key [128];
|
|
int ret;
|
|
gost_hash_ctx hash_ctx;
|
|
DH *dh = DH_new();
|
|
|
|
if (!dh)
|
|
return 0;
|
|
memset(dh_key,0,128);
|
|
dh->g = BN_dup(pubk->pkey.dsa->g);
|
|
dh->p = BN_dup(pubk->pkey.dsa->p);
|
|
dh->priv_key = BN_dup(priv_key);
|
|
ret=compute_pair_key_le(dh_key,((DSA *)(EVP_PKEY_get0(pubk)))->pub_key,dh) ;
|
|
DH_free(dh);
|
|
if (!ret) return 0;
|
|
init_gost_hash_ctx(&hash_ctx,&GostR3411_94_CryptoProParamSet);
|
|
start_hash(&hash_ctx);
|
|
hash_block(&hash_ctx,dh_key,128);
|
|
finish_hash(&hash_ctx,shared_key);
|
|
done_gost_hash_ctx(&hash_ctx);
|
|
return 1;
|
|
}
|
|
|
|
/* EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-94 */
|
|
|
|
int pkey_gost94_derive(EVP_PKEY_CTX *ctx,unsigned char *key,size_t *keylen)
|
|
{
|
|
EVP_PKEY *pubk = EVP_PKEY_CTX_get0_peerkey(ctx);
|
|
EVP_PKEY *mykey = EVP_PKEY_CTX_get0_pkey(ctx);
|
|
*keylen = 32;
|
|
if (key == NULL) return 1;
|
|
|
|
return make_cp_exchange_key(gost_get0_priv_key(mykey), pubk, key);
|
|
}
|
|
|
|
/* EVP_PKEY_METHOD callback encrypt for
|
|
* GOST R 34.10-94 cryptopro modification
|
|
*/
|
|
|
|
|
|
int pkey_GOST94cp_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, size_t *outlen, const unsigned char* key, size_t key_len )
|
|
{
|
|
GOST_KEY_TRANSPORT *gkt=NULL;
|
|
unsigned char shared_key[32], ukm[8],crypted_key[44];
|
|
const struct gost_cipher_info *param=get_encryption_params(NULL);
|
|
EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(ctx);
|
|
struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
|
|
gost_ctx cctx;
|
|
int key_is_ephemeral=1;
|
|
EVP_PKEY *mykey = EVP_PKEY_CTX_get0_peerkey(ctx);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
if (mykey)
|
|
{
|
|
/* If key already set, it is not ephemeral */
|
|
key_is_ephemeral=0;
|
|
if (!gost_get0_priv_key(mykey))
|
|
{
|
|
GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
|
|
GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
|
|
goto err;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Otherwise generate ephemeral key */
|
|
key_is_ephemeral = 1;
|
|
if (out)
|
|
{
|
|
mykey = EVP_PKEY_new();
|
|
EVP_PKEY_assign(mykey, EVP_PKEY_base_id(pubk),DSA_new());
|
|
EVP_PKEY_copy_parameters(mykey,pubk);
|
|
if (!gost_sign_keygen(EVP_PKEY_get0(mykey)))
|
|
{
|
|
goto err;
|
|
}
|
|
}
|
|
}
|
|
if (out)
|
|
make_cp_exchange_key(gost_get0_priv_key(mykey),pubk,shared_key);
|
|
if (data->shared_ukm)
|
|
{
|
|
memcpy(ukm,data->shared_ukm,8);
|
|
}
|
|
else if (out)
|
|
{
|
|
if (RAND_bytes(ukm,8)<=0)
|
|
{
|
|
GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
|
|
GOST_R_RANDOM_GENERATOR_FAILURE);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
if (out) {
|
|
gost_init(&cctx,param->sblock);
|
|
keyWrapCryptoPro(&cctx,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;
|
|
}
|
|
if (key_is_ephemeral) {
|
|
if (!X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,out?mykey:pubk))
|
|
{
|
|
GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
|
|
goto err;
|
|
}
|
|
if (out) EVP_PKEY_free(mykey);
|
|
}
|
|
ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
|
|
gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
|
|
*outlen = i2d_GOST_KEY_TRANSPORT(gkt,out?&out:NULL);
|
|
if (*outlen <= 0)
|
|
{
|
|
GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,GOST_R_ERROR_PACKING_KEY_TRANSPORT_INFO);
|
|
goto err;
|
|
}
|
|
if (!key_is_ephemeral)
|
|
{
|
|
/* Set control "public key from client certificate used" */
|
|
if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <= 0)
|
|
{
|
|
GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
|
|
GOST_R_CTRL_CALL_FAILED);
|
|
goto err;
|
|
}
|
|
}
|
|
GOST_KEY_TRANSPORT_free(gkt);
|
|
return 1;
|
|
memerr:
|
|
if (key_is_ephemeral) {
|
|
EVP_PKEY_free(mykey);
|
|
}
|
|
GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
|
|
GOST_R_MALLOC_FAILURE);
|
|
err:
|
|
GOST_KEY_TRANSPORT_free(gkt);
|
|
return -1;
|
|
}
|
|
|
|
|
|
/* EVP_PLEY_METHOD callback decrypt for
|
|
* GOST R 34.10-94 cryptopro modification
|
|
*/
|
|
int pkey_GOST94cp_decrypt(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *key_len,const unsigned char *in, size_t in_len) {
|
|
const unsigned char *p = in;
|
|
GOST_KEY_TRANSPORT *gkt = NULL;
|
|
unsigned char wrappedKey[44];
|
|
unsigned char sharedKey[32];
|
|
gost_ctx cctx;
|
|
const struct gost_cipher_info *param=NULL;
|
|
EVP_PKEY *eph_key=NULL, *peerkey=NULL;
|
|
EVP_PKEY *priv= EVP_PKEY_CTX_get0_pkey(ctx);
|
|
|
|
if (!key)
|
|
{
|
|
*key_len = 32;
|
|
return 1;
|
|
}
|
|
|
|
gkt = d2i_GOST_KEY_TRANSPORT(NULL,(const unsigned char **)&p,
|
|
in_len);
|
|
if (!gkt)
|
|
{
|
|
GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
|
|
return 0;
|
|
}
|
|
eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
|
|
if (eph_key)
|
|
{
|
|
if (EVP_PKEY_derive_set_peer(ctx, eph_key) <= 0)
|
|
{
|
|
GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
|
|
GOST_R_INCOMPATIBLE_PEER_KEY);
|
|
goto err;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* Set control "public key from client certificate used" */
|
|
if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <= 0)
|
|
{
|
|
GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
|
|
GOST_R_CTRL_CALL_FAILED);
|
|
goto err;
|
|
}
|
|
}
|
|
peerkey = EVP_PKEY_CTX_get0_peerkey(ctx);
|
|
if (!peerkey)
|
|
{
|
|
GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
|
|
GOST_R_NO_PEER_KEY);
|
|
goto err;
|
|
}
|
|
|
|
param = get_encryption_params(gkt->key_agreement_info->cipher);
|
|
if(!param){
|
|
goto err;
|
|
}
|
|
|
|
gost_init(&cctx,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);
|
|
make_cp_exchange_key(gost_get0_priv_key(priv),peerkey,sharedKey);
|
|
if (!keyUnwrapCryptoPro(&cctx,sharedKey,wrappedKey,key))
|
|
{
|
|
GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
|
|
GOST_R_ERROR_COMPUTING_SHARED_KEY);
|
|
goto err;
|
|
}
|
|
|
|
EVP_PKEY_free(eph_key);
|
|
GOST_KEY_TRANSPORT_free(gkt);
|
|
return 1;
|
|
err:
|
|
EVP_PKEY_free(eph_key);
|
|
GOST_KEY_TRANSPORT_free(gkt);
|
|
return -1;
|
|
}
|
|
|