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/* zenutils - Utilities for working with creative firmwares.
* Copyright 2007 (c) Rasmus Ry <rasmus.ry{at}gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "crypt.h"
#include <stdexcept>
#include <beecrypt/hmacsha1.h>
#include <beecrypt/blockmode.h>
#include <beecrypt/blowfish.h>
bool zen::hmac_sha1_calc(const byte* key, size_t keylen, const byte* data,
size_t datalen, byte* sig, size_t* siglen)
{
hmacsha1Param param;
if (hmacsha1Setup(¶m, key, keylen * 8))
return false;
if (hmacsha1Update(¶m, data, datalen))
return false;
if (hmacsha1Digest(¶m, sig))
return false;
return true;
}
bool zen::bf_cbc_encrypt(const byte* key, size_t keylen, byte* data,
size_t datalen, const byte* iv)
{
if (datalen % blowfish.blocksize)
throw std::invalid_argument(
"The length must be aligned on a 8 byte boundary.");
blowfishParam param;
if (blowfishSetup(¶m, key, keylen * 8, ENCRYPT))
return false;
if (blowfishSetIV(¶m, iv))
return false;
byte* plain = new byte[datalen];
memcpy(plain, data, datalen);
unsigned int nblocks = datalen / blowfish.blocksize;
if (blockEncryptCBC(&blowfish, ¶m, (uint32_t*)data, (uint32_t*)plain,
nblocks))
{
delete [] plain;
return false;
}
return true;
}
bool zen::bf_cbc_decrypt(const byte* key, size_t keylen, byte* data,
size_t datalen, const byte* iv)
{
if (datalen % blowfish.blocksize)
throw std::invalid_argument(
"The length must be aligned on a 8 byte boundary.");
blowfishParam param;
if (blowfishSetup(¶m, key, keylen * 8, ENCRYPT))
return false;
if (blowfishSetIV(¶m, iv))
return false;
byte* cipher = new byte[datalen];
memcpy(cipher, data, datalen);
unsigned int nblocks = datalen / blowfish.blocksize;
if (blockDecryptCBC(&blowfish, ¶m, (uint32_t*)data, (uint32_t*)cipher,
nblocks))
{
delete [] cipher;
return false;
}
return true;
}
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