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/* $OpenBSD: gost89_keywrap.c,v 1.4 2022/11/26 16:08:53 tb Exp $ */
/*
* Copyright (c) 2014 Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
* Copyright (c) 2005-2006 Cryptocom LTD
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* openssl-core@openssl.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*/
#include <string.h>
#include <openssl/opensslconf.h>
#ifndef OPENSSL_NO_GOST
#include <openssl/gost.h>
#include "gost_local.h"
static void
key_diversify_crypto_pro(GOST2814789_KEY *ctx, const unsigned char *inputKey,
const unsigned char *ukm, unsigned char *outputKey)
{
unsigned long k, s1, s2;
int i, mask;
unsigned char S[8];
unsigned char *p;
memcpy(outputKey, inputKey, 32);
for (i = 0; i < 8; i++) {
/* Make array of integers from key */
/* Compute IV S */
s1 = 0, s2 = 0;
p = outputKey;
for (mask = 1; mask < 256; mask <<= 1) {
c2l(p, k);
if (mask & ukm[i]) {
s1 += k;
} else {
s2 += k;
}
}
p = S;
l2c (s1, p);
l2c (s2, p);
Gost2814789_set_key(ctx, outputKey, 256);
mask = 0;
Gost2814789_cfb64_encrypt(outputKey, outputKey, 32, ctx, S,
&mask, 1);
}
}
int
gost_key_wrap_crypto_pro(int nid, const unsigned char *keyExchangeKey,
const unsigned char *ukm, const unsigned char *sessionKey,
unsigned char *wrappedKey)
{
GOST2814789_KEY ctx;
unsigned char kek_ukm[32];
Gost2814789_set_sbox(&ctx, nid);
key_diversify_crypto_pro(&ctx, keyExchangeKey, ukm, kek_ukm);
Gost2814789_set_key(&ctx, kek_ukm, 256);
memcpy(wrappedKey, ukm, 8);
Gost2814789_encrypt(sessionKey + 0, wrappedKey + 8 + 0, &ctx);
Gost2814789_encrypt(sessionKey + 8, wrappedKey + 8 + 8, &ctx);
Gost2814789_encrypt(sessionKey + 16, wrappedKey + 8 + 16, &ctx);
Gost2814789_encrypt(sessionKey + 24, wrappedKey + 8 + 24, &ctx);
GOST2814789IMIT(sessionKey, 32, wrappedKey + 40, nid, kek_ukm, ukm);
return 1;
}
int
gost_key_unwrap_crypto_pro(int nid, const unsigned char *keyExchangeKey,
const unsigned char *wrappedKey, unsigned char *sessionKey)
{
unsigned char kek_ukm[32], cek_mac[4];
GOST2814789_KEY ctx;
Gost2814789_set_sbox(&ctx, nid);
/* First 8 bytes of wrapped Key is ukm */
key_diversify_crypto_pro(&ctx, keyExchangeKey, wrappedKey, kek_ukm);
Gost2814789_set_key(&ctx, kek_ukm, 256);
Gost2814789_decrypt(wrappedKey + 8 + 0, sessionKey + 0, &ctx);
Gost2814789_decrypt(wrappedKey + 8 + 8, sessionKey + 8, &ctx);
Gost2814789_decrypt(wrappedKey + 8 + 16, sessionKey + 16, &ctx);
Gost2814789_decrypt(wrappedKey + 8 + 24, sessionKey + 24, &ctx);
GOST2814789IMIT(sessionKey, 32, cek_mac, nid, kek_ukm, wrappedKey);
if (memcmp(cek_mac, wrappedKey + 40, 4))
return 0;
return 1;
}
#endif
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