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/* wsgcrypt.c
* Helper functions for libgcrypt
* By Erik de Jong <erikdejong@gmail.com>
* Copyright 2017 Erik de Jong
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
*/
#include "wsgcrypt.h"
gcry_error_t ws_hmac_buffer(int algo, void *digest, const void *buffer, size_t length, const void *key, size_t keylen)
{
gcry_md_hd_t hmac_handle;
gcry_error_t result = gcry_md_open(&hmac_handle, algo, GCRY_MD_FLAG_HMAC);
if (result) {
return result;
}
result = gcry_md_setkey(hmac_handle, key, keylen);
if (result) {
gcry_md_close(hmac_handle);
return result;
}
gcry_md_write(hmac_handle, buffer, length);
memcpy(digest, gcry_md_read(hmac_handle, 0), gcry_md_get_algo_dlen(algo));
gcry_md_close(hmac_handle);
return GPG_ERR_NO_ERROR;
}
void crypt_des_ecb(guint8 *output, const guint8 *buffer, const guint8 *key56)
{
guint8 key64[8];
gcry_cipher_hd_t handle;
memset(output, 0x00, 8);
/* Transform 56 bits key into 64 bits DES key */
key64[0] = key56[0];
key64[1] = (key56[0] << 7) | (key56[1] >> 1);
key64[2] = (key56[1] << 6) | (key56[2] >> 2);
key64[3] = (key56[2] << 5) | (key56[3] >> 3);
key64[4] = (key56[3] << 4) | (key56[4] >> 4);
key64[5] = (key56[4] << 3) | (key56[5] >> 5);
key64[6] = (key56[5] << 2) | (key56[6] >> 6);
key64[7] = (key56[6] << 1);
if (gcry_cipher_open(&handle, GCRY_CIPHER_DES, GCRY_CIPHER_MODE_ECB, 0)) {
return;
}
if (gcry_cipher_setkey(handle, key64, 8)) {
gcry_cipher_close(handle);
return;
}
gcry_cipher_encrypt(handle, output, 8, buffer, 8);
gcry_cipher_close(handle);
}
/*
* Editor modelines - http://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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