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/* ipsec_alg BLOWFISH cipher stubs
*
* Author: JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar>
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*
* RCS ID $Id: ipsec_alg_blowfish.c,v 1.3 2004/09/17 18:57:30 as Exp $
*/
#include <linux/config.h>
#include <linux/version.h>
/*
* special case: ipsec core modular with this static algo inside:
* must avoid MODULE magic for this file
*/
#if CONFIG_IPSEC_MODULE && CONFIG_IPSEC_ALG_BLOWFISH
#undef MODULE
#endif
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h> /* printk() */
#include <linux/errno.h> /* error codes */
#include <linux/types.h> /* size_t */
#include <linux/string.h>
/* Check if __exit is defined, if not null it */
#ifndef __exit
#define __exit
#endif
/* Low freeswan header coupling */
#include "freeswan/ipsec_alg.h"
#include "libblowfish/blowfish.h"
#define blowfish_context BF_KEY
#define ESP_BLOWFISH 7 /* truly _constant_ :) */
#define ESP_BLOWFISH_KEY_SZ_MIN 16 /* 128 bit secret key min */
#define ESP_BLOWFISH_KEY_SZ 16 /* 128 bit secret key */
#define ESP_BLOWFISH_KEY_SZ_MAX 56 /* 448 bit secret key max */
#define ESP_BLOWFISH_CBC_BLK_LEN 8 /* block size */
MODULE_AUTHOR("JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar>");
static int debug=0;
MODULE_PARM(debug, "i");
static int test=0;
MODULE_PARM(test, "i");
static int excl=0;
MODULE_PARM(excl, "i");
static int keyminbits=0;
MODULE_PARM(keyminbits, "i");
static int keymaxbits=0;
MODULE_PARM(keymaxbits, "i");
static int _blowfish_set_key(struct ipsec_alg_enc *alg, __u8 * key_e, const __u8 * key, size_t keysize) {
blowfish_context *ctx=(blowfish_context*)key_e;
if (debug > 0)
printk(KERN_DEBUG "klips_debug:_blowfish_set_key:"
"key_e=%p key=%p keysize=%d\n",
key_e, key, keysize);
BF_set_key(ctx, keysize, (unsigned char *)key);
return 0;
}
static int _blowfish_cbc_encrypt(struct ipsec_alg_enc *alg, __u8 * key_e, __u8 * in, int ilen, const __u8 *iv, int encrypt) {
/* blowfish toasts passed IV */
__u8 iv_buf[ESP_BLOWFISH_CBC_BLK_LEN];
blowfish_context *ctx=(blowfish_context*)key_e;
*((__u32*)&(iv_buf)) = ((__u32*)(iv))[0];
*((__u32*)&(iv_buf)+1) = ((__u32*)(iv))[1];
if (debug > 0)
printk(KERN_DEBUG "klips_debug:_blowfish_cbc_encrypt:"
"key_e=%p in=%p ilen=%d iv=%p encrypt=%d\n",
key_e, in, ilen, iv_buf, encrypt);
BF_cbc_encrypt(in, in, ilen, ctx, iv_buf, encrypt);
return ilen;
}
static struct ipsec_alg_enc ipsec_alg_BLOWFISH = {
ixt_version: IPSEC_ALG_VERSION,
ixt_module: THIS_MODULE,
ixt_refcnt: ATOMIC_INIT(0),
ixt_alg_type: IPSEC_ALG_TYPE_ENCRYPT,
ixt_alg_id: ESP_BLOWFISH,
ixt_name: "blowfish",
ixt_blocksize: ESP_BLOWFISH_CBC_BLK_LEN,
ixt_keyminbits: ESP_BLOWFISH_KEY_SZ_MIN*8,
ixt_keymaxbits: ESP_BLOWFISH_KEY_SZ_MAX*8,
ixt_e_keylen: ESP_BLOWFISH_KEY_SZ,
ixt_e_ctx_size: sizeof(blowfish_context),
ixt_e_set_key: _blowfish_set_key,
ixt_e_cbc_encrypt:_blowfish_cbc_encrypt,
};
IPSEC_ALG_MODULE_INIT(ipsec_blowfish_init)
{
int ret, test_ret;
if (keyminbits)
ipsec_alg_BLOWFISH.ixt_keyminbits=keyminbits;
if (keymaxbits) {
ipsec_alg_BLOWFISH.ixt_keymaxbits=keymaxbits;
if (keymaxbits*8>ipsec_alg_BLOWFISH.ixt_keymaxbits)
ipsec_alg_BLOWFISH.ixt_e_keylen=keymaxbits*8;
}
if (excl) ipsec_alg_BLOWFISH.ixt_state |= IPSEC_ALG_ST_EXCL;
ret=register_ipsec_alg_enc(&ipsec_alg_BLOWFISH);
printk("ipsec_blowfish_init(alg_type=%d alg_id=%d name=%s): ret=%d\n",
ipsec_alg_BLOWFISH.ixt_alg_type,
ipsec_alg_BLOWFISH.ixt_alg_id,
ipsec_alg_BLOWFISH.ixt_name,
ret);
if (ret==0 && test) {
test_ret=ipsec_alg_test(
ipsec_alg_BLOWFISH.ixt_alg_type,
ipsec_alg_BLOWFISH.ixt_alg_id,
test);
printk("ipsec_blowfish_init(alg_type=%d alg_id=%d): test_ret=%d\n",
ipsec_alg_BLOWFISH.ixt_alg_type,
ipsec_alg_BLOWFISH.ixt_alg_id,
test_ret);
}
return ret;
}
IPSEC_ALG_MODULE_EXIT(ipsec_blowfish_fini)
{
unregister_ipsec_alg_enc(&ipsec_alg_BLOWFISH);
return;
}
#ifdef MODULE_LICENSE
MODULE_LICENSE("GPL");
#endif
EXPORT_NO_SYMBOLS;
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