+++ /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/err.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;
- int tmp_outlen;
- 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);
- tmp_outlen = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL);
- if (tmp_outlen <= 0) {
- GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT,
- GOST_R_ERROR_PACKING_KEY_TRANSPORT_INFO);
- goto err;
- }
- *outlen = tmp_outlen;
- 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, ERR_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;
-}
projects / openssl.git / blobdiff