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139 lines
4.8 KiB
C
Executable File
139 lines
4.8 KiB
C
Executable File
/* $OpenBSD: gost89_keywrap.c,v 1.3 2014/11/09 19:28:44 miod Exp $ */
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/*
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* Copyright (c) 2014 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
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* Copyright (c) 2005-2006 Cryptocom LTD
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*/
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#include <string.h>
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#include <openssl/opensslconf.h>
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#ifndef OPENSSL_NO_GOST
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#include <openssl/gost.h>
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#include "gost_locl.h"
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static void
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key_diversify_crypto_pro(GOST2814789_KEY *ctx, const unsigned char *inputKey,
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const unsigned char *ukm, unsigned char *outputKey)
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{
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unsigned long k, s1, s2;
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int i, mask;
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unsigned char S[8];
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unsigned char *p;
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memcpy(outputKey, inputKey, 32);
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for (i = 0; i < 8; i++) {
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/* Make array of integers from key */
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/* Compute IV S */
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s1 = 0, s2 = 0;
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p = outputKey;
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for (mask = 1; mask < 256; mask <<= 1) {
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c2l(p, k);
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if (mask & ukm[i]) {
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s1 += k;
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} else {
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s2 += k;
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}
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}
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p = S;
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l2c (s1, p);
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l2c (s2, p);
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Gost2814789_set_key(ctx, outputKey, 256);
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mask = 0;
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Gost2814789_cfb64_encrypt(outputKey, outputKey, 32, ctx, S,
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&mask, 1);
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}
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}
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int
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gost_key_wrap_crypto_pro(int nid, const unsigned char *keyExchangeKey,
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const unsigned char *ukm, const unsigned char *sessionKey,
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unsigned char *wrappedKey)
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{
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GOST2814789_KEY ctx;
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unsigned char kek_ukm[32];
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Gost2814789_set_sbox(&ctx, nid);
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key_diversify_crypto_pro(&ctx, keyExchangeKey, ukm, kek_ukm);
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Gost2814789_set_key(&ctx, kek_ukm, 256);
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memcpy(wrappedKey, ukm, 8);
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Gost2814789_encrypt(sessionKey + 0, wrappedKey + 8 + 0, &ctx);
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Gost2814789_encrypt(sessionKey + 8, wrappedKey + 8 + 8, &ctx);
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Gost2814789_encrypt(sessionKey + 16, wrappedKey + 8 + 16, &ctx);
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Gost2814789_encrypt(sessionKey + 24, wrappedKey + 8 + 24, &ctx);
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GOST2814789IMIT(sessionKey, 32, wrappedKey + 40, nid, kek_ukm, ukm);
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return 1;
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}
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int
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gost_key_unwrap_crypto_pro(int nid, const unsigned char *keyExchangeKey,
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const unsigned char *wrappedKey, unsigned char *sessionKey)
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{
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unsigned char kek_ukm[32], cek_mac[4];
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GOST2814789_KEY ctx;
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Gost2814789_set_sbox(&ctx, nid);
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/* First 8 bytes of wrapped Key is ukm */
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key_diversify_crypto_pro(&ctx, keyExchangeKey, wrappedKey, kek_ukm);
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Gost2814789_set_key(&ctx, kek_ukm, 256);
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Gost2814789_decrypt(wrappedKey + 8 + 0, sessionKey + 0, &ctx);
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Gost2814789_decrypt(wrappedKey + 8 + 8, sessionKey + 8, &ctx);
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Gost2814789_decrypt(wrappedKey + 8 + 16, sessionKey + 16, &ctx);
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Gost2814789_decrypt(wrappedKey + 8 + 24, sessionKey + 24, &ctx);
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GOST2814789IMIT(sessionKey, 32, cek_mac, nid, kek_ukm, wrappedKey);
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if (memcmp(cek_mac, wrappedKey + 40, 4))
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return 0;
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return 1;
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}
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#endif
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