linux-imx

/* Kernel cryptographic api.

 * cast6.c - Cast6 cipher algorithm [rfc2612].

 *

 * CAST-256 (*cast6*) is a DES like Substitution-Permutation Network (SPN)

 * cryptosystem built upon the CAST-128 (*cast5*) [rfc2144] encryption

 * algorithm.

 *

 * Copyright (C) 2003 Kartikey Mahendra Bhatt <kartik_me@hotmail.com>.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms of GNU General Public License as published by the Free

 * Software Foundation; either version 2 of the License, or (at your option)

 * any later version.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

​

​

#include <asm/byteorder.h>

#include <linux/init.h>

#include <linux/crypto.h>

#include <linux/module.h>

#include <linux/errno.h>

#include <linux/string.h>

#include <linux/types.h>

#include <crypto/cast6.h>

​

#define s1 cast_s1

#define s2 cast_s2

#define s3 cast_s3

#define s4 cast_s4

​

#define F1(D, r, m)  ((I = ((m) + (D))), (I = rol32(I, (r))),   \

    (((s1[I >> 24] ^ s2[(I>>16)&0xff]) - s3[(I>>8)&0xff]) + s4[I&0xff]))

#define F2(D, r, m)  ((I = ((m) ^ (D))), (I = rol32(I, (r))),   \

    (((s1[I >> 24] - s2[(I>>16)&0xff]) + s3[(I>>8)&0xff]) ^ s4[I&0xff]))

#define F3(D, r, m)  ((I = ((m) - (D))), (I = rol32(I, (r))),   \

    (((s1[I >> 24] + s2[(I>>16)&0xff]) ^ s3[(I>>8)&0xff]) - s4[I&0xff]))

​

static const u32 Tm[24][8] = {

    { 0x5a827999, 0xc95c653a, 0x383650db, 0xa7103c7c, 0x15ea281d,

        0x84c413be, 0xf39dff5f, 0x6277eb00 } ,

    { 0xd151d6a1, 0x402bc242, 0xaf05ade3, 0x1ddf9984, 0x8cb98525,

        0xfb9370c6, 0x6a6d5c67, 0xd9474808 } ,

    { 0x482133a9, 0xb6fb1f4a, 0x25d50aeb, 0x94aef68c, 0x0388e22d,

        0x7262cdce, 0xe13cb96f, 0x5016a510 } ,

    { 0xbef090b1, 0x2dca7c52, 0x9ca467f3, 0x0b7e5394, 0x7a583f35,

        0xe9322ad6, 0x580c1677, 0xc6e60218 } ,

    { 0x35bfedb9, 0xa499d95a, 0x1373c4fb, 0x824db09c, 0xf1279c3d,

        0x600187de, 0xcedb737f, 0x3db55f20 } ,

    { 0xac8f4ac1, 0x1b693662, 0x8a432203, 0xf91d0da4, 0x67f6f945,

        0xd6d0e4e6, 0x45aad087, 0xb484bc28 } ,

    { 0x235ea7c9, 0x9238936a, 0x01127f0b, 0x6fec6aac, 0xdec6564d,

        0x4da041ee, 0xbc7a2d8f, 0x2b541930 } ,

    { 0x9a2e04d1, 0x0907f072, 0x77e1dc13, 0xe6bbc7b4, 0x5595b355,

        0xc46f9ef6, 0x33498a97, 0xa2237638 } ,

    { 0x10fd61d9, 0x7fd74d7a, 0xeeb1391b, 0x5d8b24bc, 0xcc65105d,

        0x3b3efbfe, 0xaa18e79f, 0x18f2d340 } ,

    { 0x87ccbee1, 0xf6a6aa82, 0x65809623, 0xd45a81c4, 0x43346d65,

        0xb20e5906, 0x20e844a7, 0x8fc23048 } ,

    { 0xfe9c1be9, 0x6d76078a, 0xdc4ff32b, 0x4b29decc, 0xba03ca6d,

        0x28ddb60e, 0x97b7a1af, 0x06918d50 } ,

    { 0x756b78f1, 0xe4456492, 0x531f5033, 0xc1f93bd4, 0x30d32775,

        0x9fad1316, 0x0e86feb7, 0x7d60ea58 } ,

    { 0xec3ad5f9, 0x5b14c19a, 0xc9eead3b, 0x38c898dc, 0xa7a2847d,

        0x167c701e, 0x85565bbf, 0xf4304760 } ,

    { 0x630a3301, 0xd1e41ea2, 0x40be0a43, 0xaf97f5e4, 0x1e71e185,

        0x8d4bcd26, 0xfc25b8c7, 0x6affa468 } ,

    { 0xd9d99009, 0x48b37baa, 0xb78d674b, 0x266752ec, 0x95413e8d,

        0x041b2a2e, 0x72f515cf, 0xe1cf0170 } ,

    { 0x50a8ed11, 0xbf82d8b2, 0x2e5cc453, 0x9d36aff4, 0x0c109b95,

        0x7aea8736, 0xe9c472d7, 0x589e5e78 } ,

    { 0xc7784a19, 0x365235ba, 0xa52c215b, 0x14060cfc, 0x82dff89d,

        0xf1b9e43e, 0x6093cfdf, 0xcf6dbb80 } ,

    { 0x3e47a721, 0xad2192c2, 0x1bfb7e63, 0x8ad56a04, 0xf9af55a5,

        0x68894146, 0xd7632ce7, 0x463d1888 } ,

    { 0xb5170429, 0x23f0efca, 0x92cadb6b, 0x01a4c70c, 0x707eb2ad,

        0xdf589e4e, 0x4e3289ef, 0xbd0c7590 } ,

    { 0x2be66131, 0x9ac04cd2, 0x099a3873, 0x78742414, 0xe74e0fb5,

        0x5627fb56, 0xc501e6f7, 0x33dbd298 } ,

    { 0xa2b5be39, 0x118fa9da, 0x8069957b, 0xef43811c, 0x5e1d6cbd,

        0xccf7585e, 0x3bd143ff, 0xaaab2fa0 } ,

    { 0x19851b41, 0x885f06e2, 0xf738f283, 0x6612de24, 0xd4ecc9c5,

        0x43c6b566, 0xb2a0a107, 0x217a8ca8 } ,

    { 0x90547849, 0xff2e63ea, 0x6e084f8b, 0xdce23b2c, 0x4bbc26cd,

        0xba96126e, 0x296ffe0f, 0x9849e9b0 } ,

    { 0x0723d551, 0x75fdc0f2, 0xe4d7ac93, 0x53b19834, 0xc28b83d5,

        0x31656f76, 0xa03f5b17, 0x0f1946b8 }

};

​

static const u8 Tr[4][8] = {