254 lines
7.3 KiB
C
254 lines
7.3 KiB
C
/*
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* ipsec_alg AES cipher stubs
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*
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* Author: JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar>
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*
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* $Id: ipsec_alg_aes.c,v 1.2 2004/03/22 21:53:19 as Exp $
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* Fixes by:
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* PK: Pawel Krawczyk <kravietz@aba.krakow.pl>
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* Fixes list:
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* PK: make XCBC comply with latest draft (keylength)
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*
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*/
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#include <linux/config.h>
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#include <linux/version.h>
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/*
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* special case: ipsec core modular with this static algo inside:
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* must avoid MODULE magic for this file
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*/
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#if CONFIG_IPSEC_MODULE && CONFIG_IPSEC_ALG_AES
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#undef MODULE
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#endif
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h> /* printk() */
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#include <linux/errno.h> /* error codes */
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#include <linux/types.h> /* size_t */
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#include <linux/string.h>
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/* Check if __exit is defined, if not null it */
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#ifndef __exit
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#define __exit
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#endif
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/* Low freeswan header coupling */
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#include "freeswan/ipsec_alg.h"
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#include "libaes/aes_cbc.h"
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#define CONFIG_IPSEC_ALG_AES_MAC 1
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#define AES_CONTEXT_T aes_context
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MODULE_AUTHOR("JuanJo Ciarlante <jjo-ipsec@mendoza.gov.ar>");
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static int debug=0;
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MODULE_PARM(debug, "i");
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static int test=0;
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MODULE_PARM(test, "i");
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static int excl=0;
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MODULE_PARM(excl, "i");
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static int keyminbits=0;
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MODULE_PARM(keyminbits, "i");
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static int keymaxbits=0;
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MODULE_PARM(keymaxbits, "i");
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#if CONFIG_IPSEC_ALG_AES_MAC
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#include "libaes/aes_xcbc_mac.h"
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/*
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* Not IANA number yet (draft-ietf-ipsec-ciph-aes-xcbc-mac-00.txt).
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* We use 9 for non-modular algorithm and none for modular, thus
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* forcing user to specify one on module load. -kravietz
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*/
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#ifdef MODULE
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static int auth_id=0;
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#else
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static int auth_id=9;
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#endif
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MODULE_PARM(auth_id, "i");
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#endif
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#define ESP_AES 12 /* truely _constant_ :) */
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/* 128, 192 or 256 */
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#define ESP_AES_KEY_SZ_MIN 16 /* 128 bit secret key */
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#define ESP_AES_KEY_SZ_MAX 32 /* 256 bit secret key */
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#define ESP_AES_CBC_BLK_LEN 16 /* AES-CBC block size */
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/* Values according to draft-ietf-ipsec-ciph-aes-xcbc-mac-02.txt
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* -kravietz
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*/
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#define ESP_AES_MAC_KEY_SZ 16 /* 128 bit MAC key */
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#define ESP_AES_MAC_BLK_LEN 16 /* 128 bit block */
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static int _aes_set_key(struct ipsec_alg_enc *alg, __u8 * key_e, const __u8 * key, size_t keysize) {
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int ret;
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AES_CONTEXT_T *ctx=(AES_CONTEXT_T*)key_e;
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ret=AES_set_key(ctx, key, keysize)!=0? 0: -EINVAL;
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if (debug > 0)
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printk(KERN_DEBUG "klips_debug:_aes_set_key:"
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"ret=%d key_e=%p key=%p keysize=%d\n",
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ret, key_e, key, keysize);
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return ret;
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}
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static int _aes_cbc_encrypt(struct ipsec_alg_enc *alg, __u8 * key_e, __u8 * in, int ilen, const __u8 * iv, int encrypt) {
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AES_CONTEXT_T *ctx=(AES_CONTEXT_T*)key_e;
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if (debug > 0)
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printk(KERN_DEBUG "klips_debug:_aes_cbc_encrypt:"
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"key_e=%p in=%p ilen=%d iv=%p encrypt=%d\n",
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key_e, in, ilen, iv, encrypt);
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return AES_cbc_encrypt(ctx, in, in, ilen, iv, encrypt);
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}
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#if CONFIG_IPSEC_ALG_AES_MAC
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static int _aes_mac_set_key(struct ipsec_alg_auth *alg, __u8 * key_a, const __u8 * key, int keylen) {
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aes_context_mac *ctxm=(aes_context_mac *)key_a;
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return AES_xcbc_mac_set_key(ctxm, key, keylen)? 0 : -EINVAL;
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}
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static int _aes_mac_hash(struct ipsec_alg_auth *alg, __u8 * key_a, const __u8 * dat, int len, __u8 * hash, int hashlen) {
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int ret;
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char hash_buf[16];
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aes_context_mac *ctxm=(aes_context_mac *)key_a;
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ret=AES_xcbc_mac_hash(ctxm, dat, len, hash_buf);
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memcpy(hash, hash_buf, hashlen);
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return ret;
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}
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static struct ipsec_alg_auth ipsec_alg_AES_MAC = {
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ixt_version: IPSEC_ALG_VERSION,
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ixt_module: THIS_MODULE,
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ixt_refcnt: ATOMIC_INIT(0),
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ixt_alg_type: IPSEC_ALG_TYPE_AUTH,
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ixt_alg_id: 0,
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ixt_name: "aes_mac",
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ixt_blocksize: ESP_AES_MAC_BLK_LEN,
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ixt_keyminbits: ESP_AES_MAC_KEY_SZ*8,
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ixt_keymaxbits: ESP_AES_MAC_KEY_SZ*8,
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ixt_a_keylen: ESP_AES_MAC_KEY_SZ,
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ixt_a_ctx_size: sizeof(aes_context_mac),
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ixt_a_hmac_set_key: _aes_mac_set_key,
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ixt_a_hmac_hash:_aes_mac_hash,
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};
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#endif /* CONFIG_IPSEC_ALG_AES_MAC */
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static struct ipsec_alg_enc ipsec_alg_AES = {
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ixt_version: IPSEC_ALG_VERSION,
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ixt_module: THIS_MODULE,
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ixt_refcnt: ATOMIC_INIT(0),
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ixt_alg_type: IPSEC_ALG_TYPE_ENCRYPT,
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ixt_alg_id: ESP_AES,
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ixt_name: "aes",
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ixt_blocksize: ESP_AES_CBC_BLK_LEN,
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ixt_keyminbits: ESP_AES_KEY_SZ_MIN*8,
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ixt_keymaxbits: ESP_AES_KEY_SZ_MAX*8,
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ixt_e_keylen: ESP_AES_KEY_SZ_MAX,
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ixt_e_ctx_size: sizeof(AES_CONTEXT_T),
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ixt_e_set_key: _aes_set_key,
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ixt_e_cbc_encrypt:_aes_cbc_encrypt,
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};
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IPSEC_ALG_MODULE_INIT( ipsec_aes_init )
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{
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int ret, test_ret;
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if (keyminbits)
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ipsec_alg_AES.ixt_keyminbits=keyminbits;
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if (keymaxbits) {
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ipsec_alg_AES.ixt_keymaxbits=keymaxbits;
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if (keymaxbits*8>ipsec_alg_AES.ixt_keymaxbits)
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ipsec_alg_AES.ixt_e_keylen=keymaxbits*8;
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}
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if (excl) ipsec_alg_AES.ixt_state |= IPSEC_ALG_ST_EXCL;
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ret=register_ipsec_alg_enc(&ipsec_alg_AES);
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printk("ipsec_aes_init(alg_type=%d alg_id=%d name=%s): ret=%d\n",
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ipsec_alg_AES.ixt_alg_type,
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ipsec_alg_AES.ixt_alg_id,
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ipsec_alg_AES.ixt_name,
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ret);
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if (ret==0 && test) {
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test_ret=ipsec_alg_test(
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ipsec_alg_AES.ixt_alg_type,
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ipsec_alg_AES.ixt_alg_id,
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test);
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printk("ipsec_aes_init(alg_type=%d alg_id=%d): test_ret=%d\n",
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ipsec_alg_AES.ixt_alg_type,
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ipsec_alg_AES.ixt_alg_id,
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test_ret);
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}
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#if CONFIG_IPSEC_ALG_AES_MAC
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if (auth_id!=0){
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int ret;
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ipsec_alg_AES_MAC.ixt_alg_id=auth_id;
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ret=register_ipsec_alg_auth(&ipsec_alg_AES_MAC);
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printk("ipsec_aes_init(alg_type=%d alg_id=%d name=%s): ret=%d\n",
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ipsec_alg_AES_MAC.ixt_alg_type,
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ipsec_alg_AES_MAC.ixt_alg_id,
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ipsec_alg_AES_MAC.ixt_name,
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ret);
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if (ret==0 && test) {
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test_ret=ipsec_alg_test(
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ipsec_alg_AES_MAC.ixt_alg_type,
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ipsec_alg_AES_MAC.ixt_alg_id,
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test);
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printk("ipsec_aes_init(alg_type=%d alg_id=%d): test_ret=%d\n",
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ipsec_alg_AES_MAC.ixt_alg_type,
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ipsec_alg_AES_MAC.ixt_alg_id,
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test_ret);
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}
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} else {
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printk(KERN_DEBUG "klips_debug: experimental ipsec_alg_AES_MAC not registered [Ok] (auth_id=%d)\n", auth_id);
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}
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#endif /* CONFIG_IPSEC_ALG_AES_MAC */
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return ret;
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}
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IPSEC_ALG_MODULE_EXIT( ipsec_aes_fini )
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{
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#if CONFIG_IPSEC_ALG_AES_MAC
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if (auth_id) unregister_ipsec_alg_auth(&ipsec_alg_AES_MAC);
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#endif /* CONFIG_IPSEC_ALG_AES_MAC */
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unregister_ipsec_alg_enc(&ipsec_alg_AES);
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return;
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}
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#ifdef MODULE_LICENSE
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MODULE_LICENSE("GPL");
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#endif
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#if 0+NOT_YET
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#ifndef MODULE
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/*
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* This is intended for static module setups, currently
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* doesn't work for modular ipsec.o with static algos inside
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*/
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static int setup_keybits(const char *str)
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{
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unsigned aux;
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char *end;
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aux = simple_strtoul(str,&end,0);
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if (aux != 128 && aux != 192 && aux != 256)
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return 0;
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keyminbits = aux;
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if (*end == 0 || *end != ',')
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return 1;
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str=end+1;
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aux = simple_strtoul(str, NULL, 0);
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if (aux != 128 && aux != 192 && aux != 256)
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return 0;
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if (aux >= keyminbits)
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keymaxbits = aux;
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return 1;
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}
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__setup("ipsec_aes_keybits=", setup_keybits);
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#endif
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#endif
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EXPORT_NO_SYMBOLS;
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