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280 lines
8.9 KiB
280 lines
8.9 KiB
/********************************************************************** |
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* gost94_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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* Implements generation and parsing of GOST_KEY_TRANSPORT for * |
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* GOST R 34.10-94 algorithms * |
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* * |
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* Requires OpenSSL 0.9.9 for compilation * |
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**********************************************************************/ |
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#include <string.h> |
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#include <openssl/dh.h> |
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#include <openssl/rand.h> |
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#include <openssl/evp.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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/* Common functions for both 94 and 2001 key exchange schemes */ |
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/* |
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* Implementation of the Diffi-Hellman key agreement scheme based on GOST-94 |
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* keys |
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*/ |
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|
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/* |
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* Computes Diffie-Hellman key and stores it into buffer in little-endian |
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* byte order as expected by both versions of GOST 94 algorithm |
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*/ |
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static int compute_pair_key_le(unsigned char *pair_key, BIGNUM *pub_key, |
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DH *dh) |
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{ |
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unsigned char be_key[128]; |
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int i, key_size; |
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key_size = DH_compute_key(be_key, pub_key, dh); |
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if (!key_size) |
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return 0; |
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memset(pair_key, 0, 128); |
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for (i = 0; i < key_size; i++) { |
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pair_key[i] = be_key[key_size - 1 - i]; |
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} |
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return key_size; |
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} |
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|
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/* |
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* Computes 256 bit Key exchange key as specified in RFC 4357 |
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*/ |
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static int make_cp_exchange_key(BIGNUM *priv_key, EVP_PKEY *pubk, |
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unsigned char *shared_key) |
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{ |
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unsigned char dh_key[128]; |
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int ret; |
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gost_hash_ctx hash_ctx; |
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DH *dh = DH_new(); |
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if (!dh) |
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return 0; |
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memset(dh_key, 0, 128); |
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dh->g = BN_dup(pubk->pkey.dsa->g); |
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dh->p = BN_dup(pubk->pkey.dsa->p); |
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dh->priv_key = BN_dup(priv_key); |
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ret = |
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compute_pair_key_le(dh_key, ((DSA *)(EVP_PKEY_get0(pubk)))->pub_key, |
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dh); |
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DH_free(dh); |
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if (!ret) |
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return 0; |
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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, dh_key, 128); |
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finish_hash(&hash_ctx, shared_key); |
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done_gost_hash_ctx(&hash_ctx); |
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return 1; |
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} |
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/* EVP_PKEY_METHOD callback derive. Implements VKO R 34.10-94 */ |
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int pkey_gost94_derive(EVP_PKEY_CTX *ctx, unsigned char *key, size_t *keylen) |
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{ |
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EVP_PKEY *pubk = EVP_PKEY_CTX_get0_peerkey(ctx); |
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EVP_PKEY *mykey = EVP_PKEY_CTX_get0_pkey(ctx); |
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*keylen = 32; |
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if (key == NULL) |
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return 1; |
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return make_cp_exchange_key(gost_get0_priv_key(mykey), pubk, key); |
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} |
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/* |
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* EVP_PKEY_METHOD callback encrypt for GOST R 34.10-94 cryptopro |
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* modification |
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*/ |
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int pkey_GOST94cp_encrypt(EVP_PKEY_CTX *ctx, unsigned char *out, |
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size_t *outlen, const unsigned char *key, |
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size_t key_len) |
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{ |
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GOST_KEY_TRANSPORT *gkt = NULL; |
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unsigned char shared_key[32], ukm[8], crypted_key[44]; |
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const struct gost_cipher_info *param = get_encryption_params(NULL); |
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EVP_PKEY *pubk = EVP_PKEY_CTX_get0_pkey(ctx); |
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struct gost_pmeth_data *data = EVP_PKEY_CTX_get_data(ctx); |
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gost_ctx cctx; |
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int key_is_ephemeral = 1; |
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int tmp_outlen; |
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EVP_PKEY *mykey = EVP_PKEY_CTX_get0_peerkey(ctx); |
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/* Do not use vizir cipher parameters with cryptopro */ |
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if (!get_gost_engine_param(GOST_PARAM_CRYPT_PARAMS) |
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&& param == gost_cipher_list) { |
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param = gost_cipher_list + 1; |
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} |
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if (mykey) { |
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/* If key already set, it is not ephemeral */ |
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key_is_ephemeral = 0; |
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if (!gost_get0_priv_key(mykey)) { |
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GOSTerr(GOST_F_PKEY_GOST94CP_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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} else { |
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/* Otherwise generate ephemeral key */ |
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key_is_ephemeral = 1; |
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if (out) { |
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mykey = EVP_PKEY_new(); |
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EVP_PKEY_assign(mykey, EVP_PKEY_base_id(pubk), DSA_new()); |
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EVP_PKEY_copy_parameters(mykey, pubk); |
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if (!gost_sign_keygen(EVP_PKEY_get0(mykey))) { |
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goto err; |
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} |
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} |
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} |
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if (out) |
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make_cp_exchange_key(gost_get0_priv_key(mykey), pubk, shared_key); |
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if (data->shared_ukm) { |
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memcpy(ukm, data->shared_ukm, 8); |
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} else if (out) { |
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if (RAND_bytes(ukm, 8) <= 0) { |
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GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT, |
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GOST_R_RANDOM_GENERATOR_FAILURE); |
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goto err; |
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} |
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} |
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if (out) { |
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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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goto memerr; |
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} |
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if (!ASN1_OCTET_STRING_set(gkt->key_agreement_info->eph_iv, ukm, 8)) { |
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goto memerr; |
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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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goto memerr; |
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} |
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if (!ASN1_OCTET_STRING_set |
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(gkt->key_info->encrypted_key, crypted_key + 8, 32)) { |
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goto memerr; |
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} |
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if (key_is_ephemeral) { |
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if (!X509_PUBKEY_set |
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(&gkt->key_agreement_info->ephem_key, out ? mykey : pubk)) { |
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GOSTerr(GOST_F_PKEY_GOST94CP_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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if (out) |
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EVP_PKEY_free(mykey); |
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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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tmp_outlen = i2d_GOST_KEY_TRANSPORT(gkt, out ? &out : NULL); |
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if (tmp_outlen <= 0) { |
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GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT, |
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GOST_R_ERROR_PACKING_KEY_TRANSPORT_INFO); |
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goto err; |
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} |
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*outlen = tmp_outlen; |
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if (!key_is_ephemeral) { |
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/* Set control "public key from client certificate used" */ |
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if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <= |
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0) { |
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GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT, GOST_R_CTRL_CALL_FAILED); |
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goto err; |
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} |
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} |
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GOST_KEY_TRANSPORT_free(gkt); |
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return 1; |
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memerr: |
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if (key_is_ephemeral) { |
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EVP_PKEY_free(mykey); |
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} |
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GOSTerr(GOST_F_PKEY_GOST94CP_ENCRYPT, GOST_R_MALLOC_FAILURE); |
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err: |
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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_PLEY_METHOD callback decrypt for GOST R 34.10-94 cryptopro |
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* modification |
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*/ |
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int pkey_GOST94cp_decrypt(EVP_PKEY_CTX *ctx, unsigned char *key, |
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size_t *key_len, const unsigned char *in, |
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size_t in_len) |
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{ |
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const unsigned char *p = in; |
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GOST_KEY_TRANSPORT *gkt = NULL; |
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unsigned char wrappedKey[44]; |
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unsigned char sharedKey[32]; |
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gost_ctx cctx; |
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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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EVP_PKEY *priv = EVP_PKEY_CTX_get0_pkey(ctx); |
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if (!key) { |
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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, in_len); |
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if (!gkt) { |
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GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT, |
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GOST_R_ERROR_PARSING_KEY_TRANSPORT_INFO); |
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return 0; |
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} |
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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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if (EVP_PKEY_derive_set_peer(ctx, eph_key) <= 0) { |
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GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT, |
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GOST_R_INCOMPATIBLE_PEER_KEY); |
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goto err; |
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} |
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} else { |
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/* Set control "public key from client certificate used" */ |
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if (EVP_PKEY_CTX_ctrl(ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 3, NULL) <= |
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0) { |
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GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT, 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(ctx); |
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if (!peerkey) { |
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GOSTerr(GOST_F_PKEY_GOST94CP_DECRYPT, 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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if (!param) { |
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goto err; |
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} |
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gost_init(&cctx, 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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make_cp_exchange_key(gost_get0_priv_key(priv), peerkey, sharedKey); |
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if (!keyUnwrapCryptoPro(&cctx, sharedKey, wrappedKey, key)) { |
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GOSTerr(GOST_F_PKEY_GOST94CP_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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EVP_PKEY_free(eph_key); |
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GOST_KEY_TRANSPORT_free(gkt); |
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return 1; |
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err: |
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EVP_PKEY_free(eph_key); |
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GOST_KEY_TRANSPORT_free(gkt); |
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return -1; |
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}
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