engines/ccgost/gost2001_keyx.c - third_party/openssl - Git at Google

 /**********************************************************************
  *                          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"


 /* 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;
 	}


 /*
  * EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-2001
  * algorithm
  */
 int pkey_gost2001_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen)
 {
 	/* Public key of peer in the ctx field peerkey
 	 * Our private key in the ctx pkey
 	 * ukm is in the algorithm specific context data
 	 */
 	EVP_PKEY *my_key = EVP_PKEY_CTX_get0_pkey(ctx);
 	EVP_PKEY *peer_key = EVP_PKEY_CTX_get0_peerkey(ctx);
 	struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);

 	if (!data->shared_ukm) {
 		GOSTerr(GOST_F_PKEY_GOST2001_DERIVE, GOST_R_UKM_NOT_SET);
 		return 0;
 	}

 	if (key == NULL) {
 		*keylen = 32;
 		return 32;
 	}

 	*keylen=VKO_compute_key(key, 32, EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
 		(EC_KEY *)EVP_PKEY_get0(my_key),data->shared_ukm);
 	return 1;
 }


 /*
  * EVP_PKEY_METHOD callback encrypt
  * Implementation of GOST2001 key transport, cryptocom variation
  */
 /* Generates ephemeral key based on pubk algorithm
  * computes shared key using VKO and returns filled up
  * GOST_KEY_TRANSPORT structure
  */

 /*
  * 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);
 	const struct gost_cipher_info *param=get_encryption_params(NULL);
 	unsigned char ukm[8], shared_key[32], crypted_key[44];
 	int ret=0;
 	int key_is_ephemeral=1;
 	gost_ctx cctx;
 	EVP_PKEY *sec_key=EVP_PKEY_CTX_get0_peerkey(pctx);
 	if (data->shared_ukm)
 		{
 		memcpy(ukm, data->shared_ukm,8);
 		}
 	else if (out)
 		{

 		if (RAND_bytes(ukm,8)<=0)
 			{
 			GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
 				GOST_R_RANDOM_GENERATOR_FAILURE);
 			return 0;
 			}
 		}
 	/* Check for private key in the peer_key of context */
 	if (sec_key)
 		{
 		key_is_ephemeral=0;
 		if (!gost_get0_priv_key(sec_key))
 			{
 			GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
 			GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
 			goto err;
 			}
 		}
 	else
 		{
 		key_is_ephemeral=1;
 		if (out)
 			{
 			sec_key = EVP_PKEY_new();
 			EVP_PKEY_assign(sec_key,EVP_PKEY_base_id(pubk),EC_KEY_new());
 			EVP_PKEY_copy_parameters(sec_key,pubk);
 			if (!gost2001_keygen(EVP_PKEY_get0(sec_key)))
 				{
 				goto err;
 				}
 			}
 		}
 	if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS) && param ==  gost_cipher_list)
 		{
 		param= gost_cipher_list+1;
 		}
     if (out)
 		{
 		VKO_compute_key(shared_key,32,EC_KEY_get0_public_key(EVP_PKEY_get0(pubk)),EVP_PKEY_get0(sec_key),ukm);
 		gost_init(&cctx,param->sblock);
 		keyWrapCryptoPro(&cctx,shared_key,ukm,key,crypted_key);
 		}
 	gkt = GOST_KEY_TRANSPORT_new();
 	if (!gkt)
 		{
 		goto err;
 		}
 	if(!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv,
 			ukm,8))
 		{
 		goto err;
 		}
 	if (!ASN1_OCTET_STRING_set(gkt->key_info->imit,crypted_key+40,4))
 		{
 		goto err;
 		}
 	if (!ASN1_OCTET_STRING_set(gkt->key_info->encrypted_key,crypted_key+8,32))
 		{
 		goto err;
 		}
 	if (key_is_ephemeral) {
 		if (!X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,out?sec_key:pubk))
 			{
 			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);
 	if (key_is_ephemeral && sec_key) EVP_PKEY_free(sec_key);
 	if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt,out?&out:NULL))>0) ret =1;
 	GOST_KEY_TRANSPORT_free(gkt);
 	return ret;
 	err:
 	if (key_is_ephemeral && sec_key) EVP_PKEY_free(sec_key);
 	GOST_KEY_TRANSPORT_free(gkt);
 	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;
 	unsigned char wrappedKey[44];
 	unsigned char sharedKey[32];
 	gost_ctx ctx;
 	const struct gost_cipher_info *param=NULL;
 	EVP_PKEY *eph_key=NULL;

 	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;
 		}

 	eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
 	if (!eph_key) {
 		eph_key = EVP_PKEY_CTX_get0_peerkey(pctx);
 		if (! eph_key) {
 			GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
 				GOST_R_NO_PEER_KEY);
 			goto err;
 		}
 		/* Increment reference count of peer key */
 		CRYPTO_add(&(eph_key->references),1 ,CRYPTO_LOCK_EVP_PKEY);
 	}

 	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))
 		{
 		GOSTerr(GOST_F_PKCS7_GOST94CP_KEY_TRANSPORT_DECRYPT,
 			GOST_R_ERROR_COMPUTING_SHARED_KEY);
 		goto err;
 		}

 	EVP_PKEY_free(eph_key);
 	GOST_KEY_TRANSPORT_free(gkt);
 	ret=1;
 err:
 	return ret;
 	}
	/**********************************************************************
	* 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"



	/* 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;
	}


	/*
	* EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-2001
	* algorithm
	*/
	int pkey_gost2001_derive(EVP_PKEY_CTX ctx, unsigned char key, size_t *keylen)
	{
	/* Public key of peer in the ctx field peerkey
	* Our private key in the ctx pkey
	* ukm is in the algorithm specific context data
	*/
	EVP_PKEY *my_key = EVP_PKEY_CTX_get0_pkey(ctx);
	EVP_PKEY *peer_key = EVP_PKEY_CTX_get0_peerkey(ctx);
	struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx);

	if (!data->shared_ukm) {
	GOSTerr(GOST_F_PKEY_GOST2001_DERIVE, GOST_R_UKM_NOT_SET);
	return 0;
	}

	if (key == NULL) {
	*keylen = 32;
	return 32;
	}

	*keylen=VKO_compute_key(key, 32, EC_KEY_get0_public_key(EVP_PKEY_get0(peer_key)),
	(EC_KEY *)EVP_PKEY_get0(my_key),data->shared_ukm);
	return 1;
	}




	/*
	* EVP_PKEY_METHOD callback encrypt
	* Implementation of GOST2001 key transport, cryptocom variation
	*/
	/* Generates ephemeral key based on pubk algorithm
	* computes shared key using VKO and returns filled up
	* GOST_KEY_TRANSPORT structure
	*/

	/*
	* 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);
	const struct gost_cipher_info *param=get_encryption_params(NULL);
	unsigned char ukm[8], shared_key[32], crypted_key[44];
	int ret=0;
	int key_is_ephemeral=1;
	gost_ctx cctx;
	EVP_PKEY *sec_key=EVP_PKEY_CTX_get0_peerkey(pctx);
	if (data->shared_ukm)
	{
	memcpy(ukm, data->shared_ukm,8);
	}
	else if (out)
	{

	if (RAND_bytes(ukm,8)<=0)
	{
	GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
	GOST_R_RANDOM_GENERATOR_FAILURE);
	return 0;
	}
	}
	/* Check for private key in the peer_key of context */
	if (sec_key)
	{
	key_is_ephemeral=0;
	if (!gost_get0_priv_key(sec_key))
	{
	GOSTerr(GOST_F_PKEY_GOST01CP_ENCRYPT,
	GOST_R_NO_PRIVATE_PART_OF_NON_EPHEMERAL_KEYPAIR);
	goto err;
	}
	}
	else
	{
	key_is_ephemeral=1;
	if (out)
	{
	sec_key = EVP_PKEY_new();
	EVP_PKEY_assign(sec_key,EVP_PKEY_base_id(pubk),EC_KEY_new());
	EVP_PKEY_copy_parameters(sec_key,pubk);
	if (!gost2001_keygen(EVP_PKEY_get0(sec_key)))
	{
	goto err;
	}
	}
	}
	if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS) && param == gost_cipher_list)
	{
	param= gost_cipher_list+1;
	}
	if (out)
	{
	VKO_compute_key(shared_key,32,EC_KEY_get0_public_key(EVP_PKEY_get0(pubk)),EVP_PKEY_get0(sec_key),ukm);
	gost_init(&cctx,param->sblock);
	keyWrapCryptoPro(&cctx,shared_key,ukm,key,crypted_key);
	}
	gkt = GOST_KEY_TRANSPORT_new();
	if (!gkt)
	{
	goto err;
	}
	if(!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv,
	ukm,8))
	{
	goto err;
	}
	if (!ASN1_OCTET_STRING_set(gkt->key_info->imit,crypted_key+40,4))
	{
	goto err;
	}
	if (!ASN1_OCTET_STRING_set(gkt->key_info->encrypted_key,crypted_key+8,32))
	{
	goto err;
	}
	if (key_is_ephemeral) {
	if (!X509_PUBKEY_set(&gkt->key_agreement_info->ephem_key,out?sec_key:pubk))
	{
	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);
	if (key_is_ephemeral && sec_key) EVP_PKEY_free(sec_key);
	if ((*out_len = i2d_GOST_KEY_TRANSPORT(gkt,out?&out:NULL))>0) ret =1;
	GOST_KEY_TRANSPORT_free(gkt);
	return ret;
	err:
	if (key_is_ephemeral && sec_key) EVP_PKEY_free(sec_key);
	GOST_KEY_TRANSPORT_free(gkt);
	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;
	unsigned char wrappedKey[44];
	unsigned char sharedKey[32];
	gost_ctx ctx;
	const struct gost_cipher_info *param=NULL;
	EVP_PKEY *eph_key=NULL;

	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;
	}

	eph_key = X509_PUBKEY_get(gkt->key_agreement_info->ephem_key);
	if (!eph_key) {
	eph_key = EVP_PKEY_CTX_get0_peerkey(pctx);
	if (! eph_key) {
	GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT,
	GOST_R_NO_PEER_KEY);
	goto err;
	}
	/* Increment reference count of peer key */
	CRYPTO_add(&(eph_key->references),1 ,CRYPTO_LOCK_EVP_PKEY);
	}

	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))
	{
	GOSTerr(GOST_F_PKCS7_GOST94CP_KEY_TRANSPORT_DECRYPT,
	GOST_R_ERROR_COMPUTING_SHARED_KEY);
	goto err;
	}

	EVP_PKEY_free(eph_key);
	GOST_KEY_TRANSPORT_free(gkt);
	ret=1;
	err:
	return ret;
	}