yuzu/externals/libressl/crypto/gost/gostr341194.c

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/* $OpenBSD: gostr341194.c,v 1.5 2015/09/10 15:56:25 jsing 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/crypto.h>
#include <openssl/objects.h>
#include <openssl/gost.h>
#include "gost_locl.h"
/* Following functions are various bit meshing routines used in
* GOST R 34.11-94 algorithms */
static void
swap_bytes(unsigned char *w, unsigned char *k)
{
int i, j;
for (i = 0; i < 4; i++)
for (j = 0; j < 8; j++)
k[i + 4 * j] = w[8 * i + j];
}
/* was A_A */
static void
circle_xor8(const unsigned char *w, unsigned char *k)
{
unsigned char buf[8];
int i;
memcpy(buf, w, 8);
memmove(k, w + 8, 24);
for (i = 0; i < 8; i++)
k[i + 24] = buf[i] ^ k[i];
}
/* was R_R */
static void
transform_3(unsigned char *data)
{
unsigned short int acc;
acc = (data[0] ^ data[2] ^ data[4] ^ data[6] ^ data[24] ^ data[30]) |
((data[1] ^ data[3] ^ data[5] ^ data[7] ^ data[25] ^ data[31]) << 8);
memmove(data, data + 2, 30);
data[30] = acc & 0xff;
data[31] = acc >> 8;
}
/* Adds blocks of N bytes modulo 2**(8*n). Returns carry*/
static int
add_blocks(int n, unsigned char *left, const unsigned char *right)
{
int i;
int carry = 0;
int sum;
for (i = 0; i < n; i++) {
sum = (int)left[i] + (int)right[i] + carry;
left[i] = sum & 0xff;
carry = sum >> 8;
}
return carry;
}
/* Xor two sequences of bytes */
static void
xor_blocks(unsigned char *result, const unsigned char *a,
const unsigned char *b, size_t len)
{
size_t i;
for (i = 0; i < len; i++)
result[i] = a[i] ^ b[i];
}
/*
* Calculate H(i+1) = Hash(Hi,Mi)
* Where H and M are 32 bytes long
*/
static int
hash_step(GOSTR341194_CTX *c, unsigned char *H, const unsigned char *M)
{
unsigned char U[32], W[32], V[32], S[32], Key[32];
int i;
/* Compute first key */
xor_blocks(W, H, M, 32);
swap_bytes(W, Key);
/* Encrypt first 8 bytes of H with first key */
Gost2814789_set_key(&c->cipher, Key, 256);
Gost2814789_encrypt(H, S, &c->cipher);
/* Compute second key */
circle_xor8(H, U);
circle_xor8(M, V);
circle_xor8(V, V);
xor_blocks(W, U, V, 32);
swap_bytes(W, Key);
/* encrypt second 8 bytes of H with second key */
Gost2814789_set_key(&c->cipher, Key, 256);
Gost2814789_encrypt(H+8, S+8, &c->cipher);
/* compute third key */
circle_xor8(U, U);
U[31] = ~U[31];
U[29] = ~U[29];
U[28] = ~U[28];
U[24] = ~U[24];
U[23] = ~U[23];
U[20] = ~U[20];
U[18] = ~U[18];
U[17] = ~U[17];
U[14] = ~U[14];
U[12] = ~U[12];
U[10] = ~U[10];
U[8] = ~U[8];
U[7] = ~U[7];
U[5] = ~U[5];
U[3] = ~U[3];
U[1] = ~U[1];
circle_xor8(V, V);
circle_xor8(V, V);
xor_blocks(W, U, V, 32);
swap_bytes(W, Key);
/* encrypt third 8 bytes of H with third key */
Gost2814789_set_key(&c->cipher, Key, 256);
Gost2814789_encrypt(H+16, S+16, &c->cipher);
/* Compute fourth key */
circle_xor8(U, U);
circle_xor8(V, V);
circle_xor8(V, V);
xor_blocks(W, U, V, 32);
swap_bytes(W, Key);
/* Encrypt last 8 bytes with fourth key */
Gost2814789_set_key(&c->cipher, Key, 256);
Gost2814789_encrypt(H+24, S+24, &c->cipher);
for (i = 0; i < 12; i++)
transform_3(S);
xor_blocks(S, S, M, 32);
transform_3(S);
xor_blocks(S, S, H, 32);
for (i = 0; i < 61; i++)
transform_3(S);
memcpy(H, S, 32);
return 1;
}
int
GOSTR341194_Init(GOSTR341194_CTX *c, int nid)
{
memset(c, 0, sizeof(*c));
return Gost2814789_set_sbox(&c->cipher, nid);
}
static void
GOSTR341194_block_data_order(GOSTR341194_CTX *ctx, const unsigned char *p,
size_t num)
{
int i;
for (i = 0; i < num; i++) {
hash_step(ctx, ctx->H, p);
add_blocks(32, ctx->S, p);
p += 32;
}
}
#define DATA_ORDER_IS_LITTLE_ENDIAN
#define HASH_CBLOCK GOSTR341194_CBLOCK
#define HASH_LONG GOSTR341194_LONG
#define HASH_CTX GOSTR341194_CTX
#define HASH_UPDATE GOSTR341194_Update
#define HASH_TRANSFORM GOSTR341194_Transform
#define HASH_NO_FINAL 1
#define HASH_BLOCK_DATA_ORDER GOSTR341194_block_data_order
#include "md32_common.h"
int
GOSTR341194_Final(unsigned char *md, GOSTR341194_CTX * c)
{
unsigned char *p = (unsigned char *)c->data;
unsigned char T[32];
if (c->num > 0) {
memset(p + c->num, 0, 32 - c->num);
hash_step(c, c->H, p);
add_blocks(32, c->S, p);
}
p = T;
HOST_l2c(c->Nl, p);
HOST_l2c(c->Nh, p);
memset(p, 0, 32 - 8);
hash_step(c, c->H, T);
hash_step(c, c->H, c->S);
memcpy(md, c->H, 32);
return 1;
}
unsigned char *
GOSTR341194(const unsigned char *d, size_t n, unsigned char *md, int nid)
{
GOSTR341194_CTX c;
static unsigned char m[GOSTR341194_LENGTH];
if (md == NULL)
md = m;
if (!GOSTR341194_Init(&c, nid))
return 0;
GOSTR341194_Update(&c, d, n);
GOSTR341194_Final(md, &c);
explicit_bzero(&c, sizeof(c));
return (md);
}
#endif