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304 lines
8.4 KiB
304 lines
8.4 KiB
/**********************************************************************
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* gost_keyx.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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* VK0 34.10-2001 key exchange and GOST R 34.10-2001 *
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* based PKCS7/SMIME support *
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* Requires OpenSSL 0.9.9 for compilation *
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**********************************************************************/
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#include <openssl/evp.h>
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#include <openssl/rand.h>
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#include <string.h>
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#include <openssl/objects.h>
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#include "gost89.h"
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#include "gosthash.h"
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#include "e_gost_err.h"
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#include "gost_keywrap.h"
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#include "gost_lcl.h"
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#include "gost2001_keyx.h"
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/* Implementation of CryptoPro VKO 34.10-2001 algorithm */
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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)
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{
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unsigned char ukm_be[8],databuf[64],hashbuf[64];
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BIGNUM *UKM=NULL,*p=NULL,*order=NULL,*X=NULL,*Y=NULL;
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const BIGNUM* key=EC_KEY_get0_private_key(priv_key);
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EC_POINT *pnt=EC_POINT_new(EC_KEY_get0_group(priv_key));
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int i;
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gost_hash_ctx hash_ctx;
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BN_CTX *ctx = BN_CTX_new();
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for (i=0;i<8;i++)
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{
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ukm_be[7-i]=ukm[i];
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}
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BN_CTX_start(ctx);
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UKM=getbnfrombuf(ukm_be,8);
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p=BN_CTX_get(ctx);
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order = BN_CTX_get(ctx);
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X=BN_CTX_get(ctx);
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Y=BN_CTX_get(ctx);
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EC_GROUP_get_order(EC_KEY_get0_group(priv_key),order,ctx);
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BN_mod_mul(p,key,UKM,order,ctx);
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EC_POINT_mul(EC_KEY_get0_group(priv_key),pnt,NULL,pub_key,p,ctx);
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EC_POINT_get_affine_coordinates_GFp(EC_KEY_get0_group(priv_key),
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pnt,X,Y,ctx);
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/*Serialize elliptic curve point same way as we do it when saving
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* key */
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store_bignum(Y,databuf,32);
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store_bignum(X,databuf+32,32);
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/* And reverse byte order of whole buffer */
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for (i=0;i<64;i++)
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{
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hashbuf[63-i]=databuf[i];
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}
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init_gost_hash_ctx(&hash_ctx,&GostR3411_94_CryptoProParamSet);
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start_hash(&hash_ctx);
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hash_block(&hash_ctx,hashbuf,64);
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finish_hash(&hash_ctx,shared_key);
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done_gost_hash_ctx(&hash_ctx);
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BN_free(UKM);
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BN_CTX_end(ctx);
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BN_CTX_free(ctx);
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EC_POINT_free(pnt);
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return 32;
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}
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/*
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* EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-2001
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* algorithm
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*/
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int pkey_gost2001_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
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{
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/* Public key of peer in the ctx field peerkey
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* Our private key in the ctx pkey
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* ukm is in the algorithm specific context data
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*/
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EVP_PKEY *my_key = EVP_PKEY_CTX_get0_pkey(ctx);
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EVP_PKEY *peer_key = EVP_PKEY_CTX_get0_peerkey(ctx);
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struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);
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if (!data->shared_ukm) {
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GOSTerr(GOST_F_PKEY_GOST2001_DERIVE, GOST_R_UKM_NOT_SET);
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return 0;
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}
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if (key == NULL) {
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*keylen = 32;
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return 32;
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}
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*keylen=VKO_compute_key(key, 32, EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
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(EC_KEY *)EVP_PKEY_get0(my_key),data->shared_ukm);
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return 1;
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}
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/*
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* EVP_PKEY_METHOD callback encrypt
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* Implementation of GOST2001 key transport, cryptocom variation
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*/
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/* Generates ephemeral key based on pubk algorithm
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* computes shared key using VKO and returns filled up
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* GOST_KEY_TRANSPORT structure
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*/
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/*
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* EVP_PKEY_METHOD callback encrypt
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* Implementation of GOST2001 key transport, cryptopo variation
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*/
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int pkey_GOST01cp_encrypt(EVP_PKEY_CTX *pctx, unsigned char *out, size_t *out_len, const unsigned char *key,size_t key_len)
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{
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GOST_KEY_TRANSPORT *gkt=NULL;
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EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(pctx);
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struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(pctx);
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const struct gost_cipher_info *param=get_encryption_params(NULL);
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unsigned char ukm[8], shared_key[32], crypted_key[44];
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int ret=0;
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int key_is_ephemeral=1;
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gost_ctx cctx;
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EVP_PKEY *sec_key=EVP_PKEY_CTX_get0_peerkey(pctx);
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if (data->shared_ukm)
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{
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memcpy(ukm, data->shared_ukm,8);
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}
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else if (out)
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{
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if (RAND_bytes(ukm,8)<=0)
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{
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GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
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GOST_R_RANDOM_GENERATOR_FAILURE);
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return 0;
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}
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}
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/* Check for private key in the peer_key of context */
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if (sec_key)
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{
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key_is_ephemeral=0;
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if (!gost_get0_priv_key(sec_key))
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{
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GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
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GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
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goto err;
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}
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}
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else
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{
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key_is_ephemeral=1;
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if (out)
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{
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sec_key = EVP_PKEY_new();
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EVP_PKEY_assign(sec_key,EVP_PKEY_base_id(pubk),EC_KEY_new());
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EVP_PKEY_copy_parameters(sec_key,pubk);
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if (!gost2001_keygen(EVP_PKEY_get0(sec_key)))
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{
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goto err;
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}
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}
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}
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if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS) && param == gost_cipher_list)
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{
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param= gost_cipher_list+1;
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}
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if (out)
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{
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VKO_compute_key(shared_key,32,EC_KEY_get0_public_key(EVP_PKEY_get0(pubk)),EVP_PKEY_get0(sec_key),ukm);
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gost_init(&cctx,param->sblock);
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keyWrapCryptoPro(&cctx,shared_key,ukm,key,crypted_key);
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}
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gkt = GOST_KEY_TRANSPORT_new();
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if (!gkt)
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{
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goto err;
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}
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if(!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv,
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ukm,8))
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{
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goto err;
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}
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if (!ASN1_OCTET_STRING_set(gkt->key_info->imit,crypted_key+40,4))
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{
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goto err;
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}
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if (!ASN1_OCTET_STRING_set(gkt->key_info->encrypted_key,crypted_key+8,32))
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{
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goto err;
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}
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if (key_is_ephemeral) {
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if (!X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,out?sec_key:pubk))
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{
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GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
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GOST_R_CANNOT_PACK_EPHEMERAL_KEY);
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goto err;
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}
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}
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ASN1_OBJECT_free(gkt->key_agreement_info->cipher);
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gkt->key_agreement_info->cipher = OBJ_nid2obj(param->nid);
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if (key_is_ephemeral && sec_key) EVP_PKEY_free(sec_key);
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if (!key_is_ephemeral)
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{
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/* Set control "public key from client certificate used" */
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if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <= 0)
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{
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GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
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GOST_R_CTRL_CALL_FAILED);
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goto err;
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}
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}
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if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt,out?&out:NULL))>0) ret =1;
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GOST_KEY_TRANSPORT_free(gkt);
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return ret;
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err:
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if (key_is_ephemeral && sec_key) EVP_PKEY_free(sec_key);
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GOST_KEY_TRANSPORT_free(gkt);
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return -1;
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}
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/*
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* EVP_PKEY_METHOD callback decrypt
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* Implementation of GOST2001 key transport, cryptopo variation
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*/
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int pkey_GOST01cp_decrypt(EVP_PKEY_CTX *pctx, unsigned char *key, size_t * key_len, const unsigned char *in, size_t in_len)
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{
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const unsigned char *p = in;
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EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(pctx);
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GOST_KEY_TRANSPORT *gkt = NULL;
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int ret=0;
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unsigned char wrappedKey[44];
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unsigned char sharedKey[32];
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gost_ctx ctx;
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const struct gost_cipher_info *param=NULL;
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EVP_PKEY *eph_key=NULL, *peerkey=NULL;
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if (!key)
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{
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*key_len = 32;
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return 1;
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}
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gkt = d2i_GOST_KEY_TRANSPORT(NULL,(const unsigned char **)&p,
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in_len);
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if (!gkt)
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{
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GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO);
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return -1;
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}
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/* If key transport structure contains public key, use it */
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eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
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if (eph_key)
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{
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if (EVP_PKEY_derive_set_peer(pctx, eph_key) <= 0)
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{
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GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
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GOST_R_INCOMPATIBLE_PEER_KEY);
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goto err;
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}
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}
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else
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{
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/* Set control "public key from client certificate used" */
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if (EVP_PKEY_CTX_ctrl(pctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <= 0)
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{
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GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
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GOST_R_CTRL_CALL_FAILED);
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goto err;
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}
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}
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peerkey = EVP_PKEY_CTX_get0_peerkey(pctx);
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if (!peerkey)
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{
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GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
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GOST_R_NO_PEER_KEY);
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goto err;
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}
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param = get_encryption_params(gkt->key_agreement_info->cipher);
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gost_init(&ctx,param->sblock);
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OPENSSL_assert(gkt->key_agreement_info->eph_iv->length==8);
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memcpy(wrappedKey,gkt->key_agreement_info->eph_iv->data,8);
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OPENSSL_assert(gkt->key_info->encrypted_key->length==32);
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memcpy(wrappedKey+8,gkt->key_info->encrypted_key->data,32);
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OPENSSL_assert(gkt->key_info->imit->length==4);
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memcpy(wrappedKey+40,gkt->key_info->imit->data,4);
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VKO_compute_key(sharedKey,32,EC_KEY_get0_public_key(EVP_PKEY_get0(peerkey)),
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EVP_PKEY_get0(priv),wrappedKey);
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if (!keyUnwrapCryptoPro(&ctx,sharedKey,wrappedKey,key))
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{
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GOSTerr(GOST_F_PKEY_GOST01CP_DECRYPT,
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GOST_R_ERROR_COMPUTING_SHARED_KEY);
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goto err;
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}
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ret=1;
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err:
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if (eph_key) EVP_PKEY_free(eph_key);
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if (gkt) GOST_KEY_TRANSPORT_free(gkt);
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return ret;
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}
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