diff options
Diffstat (limited to 'linux/net/ipsec/alg/ipsec_alg_twofish.c')
| -rw-r--r-- | linux/net/ipsec/alg/ipsec_alg_twofish.c | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/linux/net/ipsec/alg/ipsec_alg_twofish.c b/linux/net/ipsec/alg/ipsec_alg_twofish.c new file mode 100644 index 000000000..dfeba1f1b --- /dev/null +++ b/linux/net/ipsec/alg/ipsec_alg_twofish.c @@ -0,0 +1,138 @@ +/* + * ipsec_alg TWOFISH cipher stubs + * + * Author: JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar> + * + * $Id: ipsec_alg_twofish.c,v 1.2 2004/03/22 21:53:19 as Exp $ + * + * 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. + * + */ +#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_TWOFISH +#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 "libtwofish/twofish.h" +#include "libtwofish/twofish_cbc.h" + +#define ESP_TWOFISH 253 /* from ipsec drafts */ + +/* 128, 192 or 256 */ +#define ESP_TWOFISH_KEY_SZ_MIN 16 /* 128 bit secret key */ +#define ESP_TWOFISH_KEY_SZ_MAX 32 /* 256 bit secret key */ +#define ESP_TWOFISH_CBC_BLK_LEN 16 /* TWOFISH-CBC 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 _twofish_set_key(struct ipsec_alg_enc *alg, __u8 * key_e, const __u8 * key, size_t keysize) { + twofish_context *ctx=(twofish_context *)key_e; + if (debug > 0) + printk(KERN_DEBUG "klips_debug:_twofish_set_key:" + "key_e=%p key=%p keysize=%d\n", + key_e, key, keysize); + twofish_set_key(ctx, key, keysize); + return 0; +} +static int _twofish_cbc_encrypt(struct ipsec_alg_enc *alg, __u8 * key_e, __u8 * in, int ilen, const __u8 * iv, int encrypt) { + twofish_context *ctx=(twofish_context *)key_e; + if (debug > 0) + printk(KERN_DEBUG "klips_debug:_twofish_cbc_encrypt:" + "key_e=%p in=%p ilen=%d iv=%p encrypt=%d\n", + key_e, in, ilen, iv, encrypt); + twofish_cbc_encrypt(ctx, in, in, ilen, iv, encrypt); + return ilen; +} +static struct ipsec_alg_enc ipsec_alg_TWOFISH = { + 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_TWOFISH, + ixt_name: "twofish", + ixt_blocksize: ESP_TWOFISH_CBC_BLK_LEN, + ixt_keyminbits: ESP_TWOFISH_KEY_SZ_MIN * 8, + ixt_keymaxbits: ESP_TWOFISH_KEY_SZ_MAX * 8, + ixt_e_keylen: ESP_TWOFISH_KEY_SZ_MAX, + ixt_e_ctx_size: sizeof(twofish_context), + ixt_e_set_key: _twofish_set_key, + ixt_e_cbc_encrypt:_twofish_cbc_encrypt, +}; + +IPSEC_ALG_MODULE_INIT( ipsec_twofish_init ) +{ + int ret, test_ret; + if (keyminbits) + ipsec_alg_TWOFISH.ixt_keyminbits=keyminbits; + if (keymaxbits) { + ipsec_alg_TWOFISH.ixt_keymaxbits=keymaxbits; + if (keymaxbits*8>ipsec_alg_TWOFISH.ixt_keymaxbits) + ipsec_alg_TWOFISH.ixt_e_keylen=keymaxbits*8; + } + if (excl) ipsec_alg_TWOFISH.ixt_state |= IPSEC_ALG_ST_EXCL; + ret=register_ipsec_alg_enc(&ipsec_alg_TWOFISH); + printk("ipsec_twofish_init(alg_type=%d alg_id=%d name=%s): ret=%d\n", + ipsec_alg_TWOFISH.ixt_alg_type, + ipsec_alg_TWOFISH.ixt_alg_id, + ipsec_alg_TWOFISH.ixt_name, ret); + if (ret==0 && test) { + test_ret=ipsec_alg_test( + ipsec_alg_TWOFISH.ixt_alg_type, + ipsec_alg_TWOFISH.ixt_alg_id, + test); + printk("ipsec_twofish_init(alg_type=%d alg_id=%d): test_ret=%d\n", + ipsec_alg_TWOFISH.ixt_alg_type, + ipsec_alg_TWOFISH.ixt_alg_id, + ret); + } + return ret; +} +IPSEC_ALG_MODULE_EXIT( ipsec_twofish_fini ) +{ + unregister_ipsec_alg_enc(&ipsec_alg_TWOFISH); + return; +} +#ifdef MODULE_LICENSE +MODULE_LICENSE("GPL"); + +EXPORT_NO_SYMBOLS; +#endif |