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openssl/engines/ccgost/gost89.c
Matt Caswell 0f113f3ee4 Run util/openssl-format-source -v -c . 
Reviewed-by: Tim Hudson <tjh@openssl.org>
2015-01-22 09:20:09 +00:00

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/**********************************************************************
* gost89.c *
* Copyright (c) 2005-2006 Cryptocom LTD *
* This file is distributed under the same license as OpenSSL *
* *
* Implementation of GOST 28147-89 encryption algorithm *
* No OpenSSL libraries required to compile and use *
* this code *
**********************************************************************/
#include <string.h>
#include "gost89.h"
/*-
Substitution blocks from RFC 4357
Note: our implementation of gost 28147-89 algorithm
uses S-box matrix rotated 90 degrees counterclockwise, relative to
examples given in RFC.
*/
/* Substitution blocks from test examples for GOST R 34.11-94*/
gost_subst_block GostR3411_94_TestParamSet = {
{0X1, 0XF, 0XD, 0X0, 0X5, 0X7, 0XA, 0X4, 0X9, 0X2, 0X3, 0XE, 0X6, 0XB,
0X8, 0XC}
,
{0XD, 0XB, 0X4, 0X1, 0X3, 0XF, 0X5, 0X9, 0X0, 0XA, 0XE, 0X7, 0X6, 0X8,
0X2, 0XC}
,
{0X4, 0XB, 0XA, 0X0, 0X7, 0X2, 0X1, 0XD, 0X3, 0X6, 0X8, 0X5, 0X9, 0XC,
0XF, 0XE}
,
{0X6, 0XC, 0X7, 0X1, 0X5, 0XF, 0XD, 0X8, 0X4, 0XA, 0X9, 0XE, 0X0, 0X3,
0XB, 0X2}
,
{0X7, 0XD, 0XA, 0X1, 0X0, 0X8, 0X9, 0XF, 0XE, 0X4, 0X6, 0XC, 0XB, 0X2,
0X5, 0X3}
,
{0X5, 0X8, 0X1, 0XD, 0XA, 0X3, 0X4, 0X2, 0XE, 0XF, 0XC, 0X7, 0X6, 0X0,
0X9, 0XB}
,
{0XE, 0XB, 0X4, 0XC, 0X6, 0XD, 0XF, 0XA, 0X2, 0X3, 0X8, 0X1, 0X0, 0X7,
0X5, 0X9}
,
{0X4, 0XA, 0X9, 0X2, 0XD, 0X8, 0X0, 0XE, 0X6, 0XB, 0X1, 0XC, 0X7, 0XF,
0X5, 0X3}
};
/* Substitution blocks for hash function 1.2.643.2.9.1.6.1 */
gost_subst_block GostR3411_94_CryptoProParamSet = {
{0x1, 0x3, 0xA, 0x9, 0x5, 0xB, 0x4, 0xF, 0x8, 0x6, 0x7, 0xE, 0xD, 0x0,
0x2, 0xC}
,
{0xD, 0xE, 0x4, 0x1, 0x7, 0x0, 0x5, 0xA, 0x3, 0xC, 0x8, 0xF, 0x6, 0x2,
0x9, 0xB}
,
{0x7, 0x6, 0x2, 0x4, 0xD, 0x9, 0xF, 0x0, 0xA, 0x1, 0x5, 0xB, 0x8, 0xE,
0xC, 0x3}
,
{0x7, 0x6, 0x4, 0xB, 0x9, 0xC, 0x2, 0xA, 0x1, 0x8, 0x0, 0xE, 0xF, 0xD,
0x3, 0x5}
,
{0x4, 0xA, 0x7, 0xC, 0x0, 0xF, 0x2, 0x8, 0xE, 0x1, 0x6, 0x5, 0xD, 0xB,
0x9, 0x3}
,
{0x7, 0xF, 0xC, 0xE, 0x9, 0x4, 0x1, 0x0, 0x3, 0xB, 0x5, 0x2, 0x6, 0xA,
0x8, 0xD}
,
{0x5, 0xF, 0x4, 0x0, 0x2, 0xD, 0xB, 0x9, 0x1, 0x7, 0x6, 0x3, 0xC, 0xE,
0xA, 0x8}
,
{0xA, 0x4, 0x5, 0x6, 0x8, 0x1, 0x3, 0x7, 0xD, 0xC, 0xE, 0x0, 0x9, 0x2,
0xB, 0xF}
};
/* Test paramset from GOST 28147 */
gost_subst_block Gost28147_TestParamSet = {
{0xC, 0x6, 0x5, 0x2, 0xB, 0x0, 0x9, 0xD, 0x3, 0xE, 0x7, 0xA, 0xF, 0x4,
0x1, 0x8}
,
{0x9, 0xB, 0xC, 0x0, 0x3, 0x6, 0x7, 0x5, 0x4, 0x8, 0xE, 0xF, 0x1, 0xA,
0x2, 0xD}
,
{0x8, 0xF, 0x6, 0xB, 0x1, 0x9, 0xC, 0x5, 0xD, 0x3, 0x7, 0xA, 0x0, 0xE,
0x2, 0x4}
,
{0x3, 0xE, 0x5, 0x9, 0x6, 0x8, 0x0, 0xD, 0xA, 0xB, 0x7, 0xC, 0x2, 0x1,
0xF, 0x4}
,
{0xE, 0x9, 0xB, 0x2, 0x5, 0xF, 0x7, 0x1, 0x0, 0xD, 0xC, 0x6, 0xA, 0x4,
0x3, 0x8}
,
{0xD, 0x8, 0xE, 0xC, 0x7, 0x3, 0x9, 0xA, 0x1, 0x5, 0x2, 0x4, 0x6, 0xF,
0x0, 0xB}
,
{0xC, 0x9, 0xF, 0xE, 0x8, 0x1, 0x3, 0xA, 0x2, 0x7, 0x4, 0xD, 0x6, 0x0,
0xB, 0x5}
,
{0x4, 0x2, 0xF, 0x5, 0x9, 0x1, 0x0, 0x8, 0xE, 0x3, 0xB, 0xC, 0xD, 0x7,
0xA, 0x6}
};
/* 1.2.643.2.2.31.1 */
gost_subst_block Gost28147_CryptoProParamSetA = {
{0xB, 0xA, 0xF, 0x5, 0x0, 0xC, 0xE, 0x8, 0x6, 0x2, 0x3, 0x9, 0x1, 0x7,
0xD, 0x4}
,
{0x1, 0xD, 0x2, 0x9, 0x7, 0xA, 0x6, 0x0, 0x8, 0xC, 0x4, 0x5, 0xF, 0x3,
0xB, 0xE}
,
{0x3, 0xA, 0xD, 0xC, 0x1, 0x2, 0x0, 0xB, 0x7, 0x5, 0x9, 0x4, 0x8, 0xF,
0xE, 0x6}
,
{0xB, 0x5, 0x1, 0x9, 0x8, 0xD, 0xF, 0x0, 0xE, 0x4, 0x2, 0x3, 0xC, 0x7,
0xA, 0x6}
,
{0xE, 0x7, 0xA, 0xC, 0xD, 0x1, 0x3, 0x9, 0x0, 0x2, 0xB, 0x4, 0xF, 0x8,
0x5, 0x6}
,
{0xE, 0x4, 0x6, 0x2, 0xB, 0x3, 0xD, 0x8, 0xC, 0xF, 0x5, 0xA, 0x0, 0x7,
0x1, 0x9}
,
{0x3, 0x7, 0xE, 0x9, 0x8, 0xA, 0xF, 0x0, 0x5, 0x2, 0x6, 0xC, 0xB, 0x4,
0xD, 0x1}
,
{0x9, 0x6, 0x3, 0x2, 0x8, 0xB, 0x1, 0x7, 0xA, 0x4, 0xE, 0xF, 0xC, 0x0,
0xD, 0x5}
};
/* 1.2.643.2.2.31.2 */
gost_subst_block Gost28147_CryptoProParamSetB = {
{0x0, 0x4, 0xB, 0xE, 0x8, 0x3, 0x7, 0x1, 0xA, 0x2, 0x9, 0x6, 0xF, 0xD,
0x5, 0xC}
,
{0x5, 0x2, 0xA, 0xB, 0x9, 0x1, 0xC, 0x3, 0x7, 0x4, 0xD, 0x0, 0x6, 0xF,
0x8, 0xE}
,
{0x8, 0x3, 0x2, 0x6, 0x4, 0xD, 0xE, 0xB, 0xC, 0x1, 0x7, 0xF, 0xA, 0x0,
0x9, 0x5}
,
{0x2, 0x7, 0xC, 0xF, 0x9, 0x5, 0xA, 0xB, 0x1, 0x4, 0x0, 0xD, 0x6, 0x8,
0xE, 0x3}
,
{0x7, 0x5, 0x0, 0xD, 0xB, 0x6, 0x1, 0x2, 0x3, 0xA, 0xC, 0xF, 0x4, 0xE,
0x9, 0x8}
,
{0xE, 0xC, 0x0, 0xA, 0x9, 0x2, 0xD, 0xB, 0x7, 0x5, 0x8, 0xF, 0x3, 0x6,
0x1, 0x4}
,
{0x0, 0x1, 0x2, 0xA, 0x4, 0xD, 0x5, 0xC, 0x9, 0x7, 0x3, 0xF, 0xB, 0x8,
0x6, 0xE}
,
{0x8, 0x4, 0xB, 0x1, 0x3, 0x5, 0x0, 0x9, 0x2, 0xE, 0xA, 0xC, 0xD, 0x6,
0x7, 0xF}
};
/* 1.2.643.2.2.31.3 */
gost_subst_block Gost28147_CryptoProParamSetC = {
{0x7, 0x4, 0x0, 0x5, 0xA, 0x2, 0xF, 0xE, 0xC, 0x6, 0x1, 0xB, 0xD, 0x9,
0x3, 0x8}
,
{0xA, 0x9, 0x6, 0x8, 0xD, 0xE, 0x2, 0x0, 0xF, 0x3, 0x5, 0xB, 0x4, 0x1,
0xC, 0x7}
,
{0xC, 0x9, 0xB, 0x1, 0x8, 0xE, 0x2, 0x4, 0x7, 0x3, 0x6, 0x5, 0xA, 0x0,
0xF, 0xD}
,
{0x8, 0xD, 0xB, 0x0, 0x4, 0x5, 0x1, 0x2, 0x9, 0x3, 0xC, 0xE, 0x6, 0xF,
0xA, 0x7}
,
{0x3, 0x6, 0x0, 0x1, 0x5, 0xD, 0xA, 0x8, 0xB, 0x2, 0x9, 0x7, 0xE, 0xF,
0xC, 0x4}
,
{0x8, 0x2, 0x5, 0x0, 0x4, 0x9, 0xF, 0xA, 0x3, 0x7, 0xC, 0xD, 0x6, 0xE,
0x1, 0xB}
,
{0x0, 0x1, 0x7, 0xD, 0xB, 0x4, 0x5, 0x2, 0x8, 0xE, 0xF, 0xC, 0x9, 0xA,
0x6, 0x3}
,
{0x1, 0xB, 0xC, 0x2, 0x9, 0xD, 0x0, 0xF, 0x4, 0x5, 0x8, 0xE, 0xA, 0x7,
0x6, 0x3}
};
/* 1.2.643.2.2.31.4 */
gost_subst_block Gost28147_CryptoProParamSetD = {
{0x1, 0xA, 0x6, 0x8, 0xF, 0xB, 0x0, 0x4, 0xC, 0x3, 0x5, 0x9, 0x7, 0xD,
0x2, 0xE}
,
{0x3, 0x0, 0x6, 0xF, 0x1, 0xE, 0x9, 0x2, 0xD, 0x8, 0xC, 0x4, 0xB, 0xA,
0x5, 0x7}
,
{0x8, 0x0, 0xF, 0x3, 0x2, 0x5, 0xE, 0xB, 0x1, 0xA, 0x4, 0x7, 0xC, 0x9,
0xD, 0x6}
,
{0x0, 0xC, 0x8, 0x9, 0xD, 0x2, 0xA, 0xB, 0x7, 0x3, 0x6, 0x5, 0x4, 0xE,
0xF, 0x1}
,
{0x1, 0x5, 0xE, 0xC, 0xA, 0x7, 0x0, 0xD, 0x6, 0x2, 0xB, 0x4, 0x9, 0x3,
0xF, 0x8}
,
{0x1, 0xC, 0xB, 0x0, 0xF, 0xE, 0x6, 0x5, 0xA, 0xD, 0x4, 0x8, 0x9, 0x3,
0x7, 0x2}
,
{0xB, 0x6, 0x3, 0x4, 0xC, 0xF, 0xE, 0x2, 0x7, 0xD, 0x8, 0x0, 0x5, 0xA,
0x9, 0x1}
,
{0xF, 0xC, 0x2, 0xA, 0x6, 0x4, 0x5, 0x0, 0x7, 0x9, 0xE, 0xD, 0x1, 0xB,
0x8, 0x3}
};
const byte CryptoProKeyMeshingKey[] = {
0x69, 0x00, 0x72, 0x22, 0x64, 0xC9, 0x04, 0x23,
0x8D, 0x3A, 0xDB, 0x96, 0x46, 0xE9, 0x2A, 0xC4,
0x18, 0xFE, 0xAC, 0x94, 0x00, 0xED, 0x07, 0x12,
0xC0, 0x86, 0xDC, 0xC2, 0xEF, 0x4C, 0xA9, 0x2B
};
/* Initialization of gost_ctx subst blocks*/
static void kboxinit(gost_ctx * c, const gost_subst_block * b)
{
int i;
for (i = 0; i < 256; i++) {
c->k87[i] = (word32) (b->k8[i >> 4] << 4 | b->k7[i & 15]) << 24;
c->k65[i] = (b->k6[i >> 4] << 4 | b->k5[i & 15]) << 16;
c->k43[i] = (b->k4[i >> 4] << 4 | b->k3[i & 15]) << 8;
c->k21[i] = b->k2[i >> 4] << 4 | b->k1[i & 15];
}
}
/* Part of GOST 28147 algorithm moved into separate function */
static word32 f(gost_ctx * c, word32 x)
{
x = c->k87[x >> 24 & 255] | c->k65[x >> 16 & 255] |
c->k43[x >> 8 & 255] | c->k21[x & 255];
/* Rotate left 11 bits */
return x << 11 | x >> (32 - 11);
}
/* Low-level encryption routine - encrypts one 64 bit block*/
void gostcrypt(gost_ctx * c, const byte * in, byte * out)
{
register word32 n1, n2; /* As named in the GOST */
n1 = in[0] | (in[1] << 8) | (in[2] << 16) | ((word32) in[3] << 24);
n2 = in[4] | (in[5] << 8) | (in[6] << 16) | ((word32) in[7] << 24);
/* Instead of swapping halves, swap names each round */
n2 ^= f(c, n1 + c->k[0]);
n1 ^= f(c, n2 + c->k[1]);
n2 ^= f(c, n1 + c->k[2]);
n1 ^= f(c, n2 + c->k[3]);
n2 ^= f(c, n1 + c->k[4]);
n1 ^= f(c, n2 + c->k[5]);
n2 ^= f(c, n1 + c->k[6]);
n1 ^= f(c, n2 + c->k[7]);
n2 ^= f(c, n1 + c->k[0]);
n1 ^= f(c, n2 + c->k[1]);
n2 ^= f(c, n1 + c->k[2]);
n1 ^= f(c, n2 + c->k[3]);
n2 ^= f(c, n1 + c->k[4]);
n1 ^= f(c, n2 + c->k[5]);
n2 ^= f(c, n1 + c->k[6]);
n1 ^= f(c, n2 + c->k[7]);
n2 ^= f(c, n1 + c->k[0]);
n1 ^= f(c, n2 + c->k[1]);
n2 ^= f(c, n1 + c->k[2]);
n1 ^= f(c, n2 + c->k[3]);
n2 ^= f(c, n1 + c->k[4]);
n1 ^= f(c, n2 + c->k[5]);
n2 ^= f(c, n1 + c->k[6]);
n1 ^= f(c, n2 + c->k[7]);
n2 ^= f(c, n1 + c->k[7]);
n1 ^= f(c, n2 + c->k[6]);
n2 ^= f(c, n1 + c->k[5]);
n1 ^= f(c, n2 + c->k[4]);
n2 ^= f(c, n1 + c->k[3]);
n1 ^= f(c, n2 + c->k[2]);
n2 ^= f(c, n1 + c->k[1]);
n1 ^= f(c, n2 + c->k[0]);
out[0] = (byte) (n2 & 0xff);
out[1] = (byte) ((n2 >> 8) & 0xff);
out[2] = (byte) ((n2 >> 16) & 0xff);
out[3] = (byte) (n2 >> 24);
out[4] = (byte) (n1 & 0xff);
out[5] = (byte) ((n1 >> 8) & 0xff);
out[6] = (byte) ((n1 >> 16) & 0xff);
out[7] = (byte) (n1 >> 24);
}
/* Low-level decryption routine. Decrypts one 64-bit block */
void gostdecrypt(gost_ctx * c, const byte * in, byte * out)
{
register word32 n1, n2; /* As named in the GOST */
n1 = in[0] | (in[1] << 8) | (in[2] << 16) | ((word32) in[3] << 24);
n2 = in[4] | (in[5] << 8) | (in[6] << 16) | ((word32) in[7] << 24);
n2 ^= f(c, n1 + c->k[0]);
n1 ^= f(c, n2 + c->k[1]);
n2 ^= f(c, n1 + c->k[2]);
n1 ^= f(c, n2 + c->k[3]);
n2 ^= f(c, n1 + c->k[4]);
n1 ^= f(c, n2 + c->k[5]);
n2 ^= f(c, n1 + c->k[6]);
n1 ^= f(c, n2 + c->k[7]);
n2 ^= f(c, n1 + c->k[7]);
n1 ^= f(c, n2 + c->k[6]);
n2 ^= f(c, n1 + c->k[5]);
n1 ^= f(c, n2 + c->k[4]);
n2 ^= f(c, n1 + c->k[3]);
n1 ^= f(c, n2 + c->k[2]);
n2 ^= f(c, n1 + c->k[1]);
n1 ^= f(c, n2 + c->k[0]);
n2 ^= f(c, n1 + c->k[7]);
n1 ^= f(c, n2 + c->k[6]);
n2 ^= f(c, n1 + c->k[5]);
n1 ^= f(c, n2 + c->k[4]);
n2 ^= f(c, n1 + c->k[3]);
n1 ^= f(c, n2 + c->k[2]);
n2 ^= f(c, n1 + c->k[1]);
n1 ^= f(c, n2 + c->k[0]);
n2 ^= f(c, n1 + c->k[7]);
n1 ^= f(c, n2 + c->k[6]);
n2 ^= f(c, n1 + c->k[5]);
n1 ^= f(c, n2 + c->k[4]);
n2 ^= f(c, n1 + c->k[3]);
n1 ^= f(c, n2 + c->k[2]);
n2 ^= f(c, n1 + c->k[1]);
n1 ^= f(c, n2 + c->k[0]);
out[0] = (byte) (n2 & 0xff);
out[1] = (byte) ((n2 >> 8) & 0xff);
out[2] = (byte) ((n2 >> 16) & 0xff);
out[3] = (byte) (n2 >> 24);
out[4] = (byte) (n1 & 0xff);
out[5] = (byte) ((n1 >> 8) & 0xff);
out[6] = (byte) ((n1 >> 16) & 0xff);
out[7] = (byte) (n1 >> 24);
}
/* Encrypts several blocks in ECB mode */
void gost_enc(gost_ctx * c, const byte * clear, byte * cipher, int blocks)
{
int i;
for (i = 0; i < blocks; i++) {
gostcrypt(c, clear, cipher);
clear += 8;
cipher += 8;
}
}
/* Decrypts several blocks in ECB mode */
void gost_dec(gost_ctx * c, const byte * cipher, byte * clear, int blocks)
{
int i;
for (i = 0; i < blocks; i++) {
gostdecrypt(c, cipher, clear);
clear += 8;
cipher += 8;
}
}
/* Encrypts several full blocks in CFB mode using 8byte IV */
void gost_enc_cfb(gost_ctx * ctx, const byte * iv, const byte * clear,
byte * cipher, int blocks)
{
byte cur_iv[8];
byte gamma[8];
int i, j;
const byte *in;
byte *out;
memcpy(cur_iv, iv, 8);
for (i = 0, in = clear, out = cipher; i < blocks; i++, in += 8, out += 8) {
gostcrypt(ctx, cur_iv, gamma);
for (j = 0; j < 8; j++) {
cur_iv[j] = out[j] = in[j] ^ gamma[j];
}
}
}
/* Decrypts several full blocks in CFB mode using 8byte IV */
void gost_dec_cfb(gost_ctx * ctx, const byte * iv, const byte * cipher,
byte * clear, int blocks)
{
byte cur_iv[8];
byte gamma[8];
int i, j;
const byte *in;
byte *out;
memcpy(cur_iv, iv, 8);
for (i = 0, in = cipher, out = clear; i < blocks; i++, in += 8, out += 8) {
gostcrypt(ctx, cur_iv, gamma);
for (j = 0; j < 8; j++) {
out[j] = (cur_iv[j] = in[j]) ^ gamma[j];
}
}
}
/* Encrypts one block using specified key */
void gost_enc_with_key(gost_ctx * c, byte * key, byte * inblock,
byte * outblock)
{
gost_key(c, key);
gostcrypt(c, inblock, outblock);
}
/* Set 256 bit key into context */
void gost_key(gost_ctx * c, const byte * k)
{
int i, j;
for (i = 0, j = 0; i < 8; i++, j += 4) {
c->k[i] =
k[j] | (k[j + 1] << 8) | (k[j + 2] << 16) | ((word32) k[j + 3] <<
24);
}
}
/* Retrieve 256-bit key from context */
void gost_get_key(gost_ctx * c, byte * k)
{
int i, j;
for (i = 0, j = 0; i < 8; i++, j += 4) {
k[j] = (byte) (c->k[i] & 0xFF);
k[j + 1] = (byte) ((c->k[i] >> 8) & 0xFF);
k[j + 2] = (byte) ((c->k[i] >> 16) & 0xFF);
k[j + 3] = (byte) ((c->k[i] >> 24) & 0xFF);
}
}
/* Initalize context. Provides default value for subst_block */
void gost_init(gost_ctx * c, const gost_subst_block * b)
{
if (!b) {
b = &GostR3411_94_TestParamSet;
}
kboxinit(c, b);
}
/* Cleans up key from context */
void gost_destroy(gost_ctx * c)
{
int i;
for (i = 0; i < 8; i++)
c->k[i] = 0;
}
/*
* Compute GOST 28147 mac block Parameters gost_ctx *c - context initalized
* with substitution blocks and key buffer - 8-byte mac state buffer block
* 8-byte block to process.
*/
void mac_block(gost_ctx * c, byte * buffer, const byte * block)
{
register word32 n1, n2; /* As named in the GOST */
int i;
for (i = 0; i < 8; i++) {
buffer[i] ^= block[i];
}
n1 = buffer[0] | (buffer[1] << 8) | (buffer[2] << 16) | ((word32)
buffer[3] << 24);
n2 = buffer[4] | (buffer[5] << 8) | (buffer[6] << 16) | ((word32)
buffer[7] << 24);
/* Instead of swapping halves, swap names each round */
n2 ^= f(c, n1 + c->k[0]);
n1 ^= f(c, n2 + c->k[1]);
n2 ^= f(c, n1 + c->k[2]);
n1 ^= f(c, n2 + c->k[3]);
n2 ^= f(c, n1 + c->k[4]);
n1 ^= f(c, n2 + c->k[5]);
n2 ^= f(c, n1 + c->k[6]);
n1 ^= f(c, n2 + c->k[7]);
n2 ^= f(c, n1 + c->k[0]);
n1 ^= f(c, n2 + c->k[1]);
n2 ^= f(c, n1 + c->k[2]);
n1 ^= f(c, n2 + c->k[3]);
n2 ^= f(c, n1 + c->k[4]);
n1 ^= f(c, n2 + c->k[5]);
n2 ^= f(c, n1 + c->k[6]);
n1 ^= f(c, n2 + c->k[7]);
buffer[0] = (byte) (n1 & 0xff);
buffer[1] = (byte) ((n1 >> 8) & 0xff);
buffer[2] = (byte) ((n1 >> 16) & 0xff);
buffer[3] = (byte) (n1 >> 24);
buffer[4] = (byte) (n2 & 0xff);
buffer[5] = (byte) ((n2 >> 8) & 0xff);
buffer[6] = (byte) ((n2 >> 16) & 0xff);
buffer[7] = (byte) (n2 >> 24);
}
/* Get mac with specified number of bits from MAC state buffer */
void get_mac(byte * buffer, int nbits, byte * out)
{
int nbytes = nbits >> 3;
int rembits = nbits & 7;
int mask = rembits ? ((1 < rembits) - 1) : 0;
int i;
for (i = 0; i < nbytes; i++)
out[i] = buffer[i];
if (rembits)
out[i] = buffer[i] & mask;
}
/*
* Compute mac of specified length (in bits) from data. Context should be
* initialized with key and subst blocks
*/
int gost_mac(gost_ctx * ctx, int mac_len, const unsigned char *data,
unsigned int data_len, unsigned char *mac)
{
byte buffer[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
byte buf2[8];
unsigned int i;
for (i = 0; i + 8 <= data_len; i += 8)
mac_block(ctx, buffer, data + i);
if (i < data_len) {
memset(buf2, 0, 8);
memcpy(buf2, data + i, data_len - i);
mac_block(ctx, buffer, buf2);
i += 8;
}
if (i == 8) {
memset(buf2, 0, 8);
mac_block(ctx, buffer, buf2);
}
get_mac(buffer, mac_len, mac);
return 1;
}
/* Compute MAC with non-zero IV. Used in some RFC 4357 algorithms */
int gost_mac_iv(gost_ctx * ctx, int mac_len, const unsigned char *iv,
const unsigned char *data, unsigned int data_len,
unsigned char *mac)
{
byte buffer[8];
byte buf2[8];
unsigned int i;
memcpy(buffer, iv, 8);
for (i = 0; i + 8 <= data_len; i += 8)
mac_block(ctx, buffer, data + i);
if (i < data_len) {
memset(buf2, 0, 8);
memcpy(buf2, data + i, data_len - i);
mac_block(ctx, buffer, buf2);
i += 8;
}
if (i == 8) {
memset(buf2, 0, 8);
mac_block(ctx, buffer, buf2);
}
get_mac(buffer, mac_len, mac);
return 1;
}
/* Implements key meshing algorithm by modifing ctx and IV in place */
void cryptopro_key_meshing(gost_ctx * ctx, unsigned char *iv)
{
unsigned char newkey[32], newiv[8];
/* Set static keymeshing key */
/* "Decrypt" key with keymeshing key */
gost_dec(ctx, CryptoProKeyMeshingKey, newkey, 4);
/* set new key */
gost_key(ctx, newkey);
/* Encrypt iv with new key */
gostcrypt(ctx, iv, newiv);
memcpy(iv, newiv, 8);
}
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