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openssl/engines/ccgost/gost94_keyx.c

Index: openssl/engines/ccgost/gost94_keyx.c
===================================================================
--- openssl/engines/ccgost/gost94_keyx.c	(revision 0)
+++ openssl/engines/ccgost/gost94_keyx.c	(revision 0)
@@ -0,0 +1,291 @@
+/**********************************************************************
+ *                             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;
+	}	
+