--- /dev/null
+/**********************************************************************
+ * 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;
+ }
+
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