fcrypt.c 18 KB
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/* FCrypt encryption algorithm
 *
 * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * 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.
 *
 * Based on code:
 *
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 * Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
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 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <asm/byteorder.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/crypto.h>

#define ROUNDS 16

struct fcrypt_ctx {
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	__be32 sched[ROUNDS];
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};

/* Rotate right two 32 bit numbers as a 56 bit number */
#define ror56(hi, lo, n)					\
do {								\
	u32 t = lo & ((1 << n) - 1);				\
	lo = (lo >> n) | ((hi & ((1 << n) - 1)) << (32 - n));	\
	hi = (hi >> n) | (t << (24-n));				\
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} while (0)
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/* Rotate right one 64 bit number as a 56 bit number */
#define ror56_64(k, n)						\
do {								\
	k = (k >> n) | ((k & ((1 << n) - 1)) << (56 - n));	\
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} while (0)
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/*
 * Sboxes for Feistel network derived from
 * /afs/transarc.com/public/afsps/afs.rel31b.export-src/rxkad/sboxes.h
 */
#undef Z
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#define Z(x) cpu_to_be32(x << 3)
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static const __be32 sbox0[256] = {
78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112
	Z(0xea), Z(0x7f), Z(0xb2), Z(0x64), Z(0x9d), Z(0xb0), Z(0xd9), Z(0x11),
	Z(0xcd), Z(0x86), Z(0x86), Z(0x91), Z(0x0a), Z(0xb2), Z(0x93), Z(0x06),
	Z(0x0e), Z(0x06), Z(0xd2), Z(0x65), Z(0x73), Z(0xc5), Z(0x28), Z(0x60),
	Z(0xf2), Z(0x20), Z(0xb5), Z(0x38), Z(0x7e), Z(0xda), Z(0x9f), Z(0xe3),
	Z(0xd2), Z(0xcf), Z(0xc4), Z(0x3c), Z(0x61), Z(0xff), Z(0x4a), Z(0x4a),
	Z(0x35), Z(0xac), Z(0xaa), Z(0x5f), Z(0x2b), Z(0xbb), Z(0xbc), Z(0x53),
	Z(0x4e), Z(0x9d), Z(0x78), Z(0xa3), Z(0xdc), Z(0x09), Z(0x32), Z(0x10),
	Z(0xc6), Z(0x6f), Z(0x66), Z(0xd6), Z(0xab), Z(0xa9), Z(0xaf), Z(0xfd),
	Z(0x3b), Z(0x95), Z(0xe8), Z(0x34), Z(0x9a), Z(0x81), Z(0x72), Z(0x80),
	Z(0x9c), Z(0xf3), Z(0xec), Z(0xda), Z(0x9f), Z(0x26), Z(0x76), Z(0x15),
	Z(0x3e), Z(0x55), Z(0x4d), Z(0xde), Z(0x84), Z(0xee), Z(0xad), Z(0xc7),
	Z(0xf1), Z(0x6b), Z(0x3d), Z(0xd3), Z(0x04), Z(0x49), Z(0xaa), Z(0x24),
	Z(0x0b), Z(0x8a), Z(0x83), Z(0xba), Z(0xfa), Z(0x85), Z(0xa0), Z(0xa8),
	Z(0xb1), Z(0xd4), Z(0x01), Z(0xd8), Z(0x70), Z(0x64), Z(0xf0), Z(0x51),
	Z(0xd2), Z(0xc3), Z(0xa7), Z(0x75), Z(0x8c), Z(0xa5), Z(0x64), Z(0xef),
	Z(0x10), Z(0x4e), Z(0xb7), Z(0xc6), Z(0x61), Z(0x03), Z(0xeb), Z(0x44),
	Z(0x3d), Z(0xe5), Z(0xb3), Z(0x5b), Z(0xae), Z(0xd5), Z(0xad), Z(0x1d),
	Z(0xfa), Z(0x5a), Z(0x1e), Z(0x33), Z(0xab), Z(0x93), Z(0xa2), Z(0xb7),
	Z(0xe7), Z(0xa8), Z(0x45), Z(0xa4), Z(0xcd), Z(0x29), Z(0x63), Z(0x44),
	Z(0xb6), Z(0x69), Z(0x7e), Z(0x2e), Z(0x62), Z(0x03), Z(0xc8), Z(0xe0),
	Z(0x17), Z(0xbb), Z(0xc7), Z(0xf3), Z(0x3f), Z(0x36), Z(0xba), Z(0x71),
	Z(0x8e), Z(0x97), Z(0x65), Z(0x60), Z(0x69), Z(0xb6), Z(0xf6), Z(0xe6),
	Z(0x6e), Z(0xe0), Z(0x81), Z(0x59), Z(0xe8), Z(0xaf), Z(0xdd), Z(0x95),
	Z(0x22), Z(0x99), Z(0xfd), Z(0x63), Z(0x19), Z(0x74), Z(0x61), Z(0xb1),
	Z(0xb6), Z(0x5b), Z(0xae), Z(0x54), Z(0xb3), Z(0x70), Z(0xff), Z(0xc6),
	Z(0x3b), Z(0x3e), Z(0xc1), Z(0xd7), Z(0xe1), Z(0x0e), Z(0x76), Z(0xe5),
	Z(0x36), Z(0x4f), Z(0x59), Z(0xc7), Z(0x08), Z(0x6e), Z(0x82), Z(0xa6),
	Z(0x93), Z(0xc4), Z(0xaa), Z(0x26), Z(0x49), Z(0xe0), Z(0x21), Z(0x64),
	Z(0x07), Z(0x9f), Z(0x64), Z(0x81), Z(0x9c), Z(0xbf), Z(0xf9), Z(0xd1),
	Z(0x43), Z(0xf8), Z(0xb6), Z(0xb9), Z(0xf1), Z(0x24), Z(0x75), Z(0x03),
	Z(0xe4), Z(0xb0), Z(0x99), Z(0x46), Z(0x3d), Z(0xf5), Z(0xd1), Z(0x39),
	Z(0x72), Z(0x12), Z(0xf6), Z(0xba), Z(0x0c), Z(0x0d), Z(0x42), Z(0x2e)
};

#undef Z
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#define Z(x) cpu_to_be32(((x & 0x1f) << 27) | (x >> 5))
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static const __be32 sbox1[256] = {
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	Z(0x77), Z(0x14), Z(0xa6), Z(0xfe), Z(0xb2), Z(0x5e), Z(0x8c), Z(0x3e),
	Z(0x67), Z(0x6c), Z(0xa1), Z(0x0d), Z(0xc2), Z(0xa2), Z(0xc1), Z(0x85),
	Z(0x6c), Z(0x7b), Z(0x67), Z(0xc6), Z(0x23), Z(0xe3), Z(0xf2), Z(0x89),
	Z(0x50), Z(0x9c), Z(0x03), Z(0xb7), Z(0x73), Z(0xe6), Z(0xe1), Z(0x39),
	Z(0x31), Z(0x2c), Z(0x27), Z(0x9f), Z(0xa5), Z(0x69), Z(0x44), Z(0xd6),
	Z(0x23), Z(0x83), Z(0x98), Z(0x7d), Z(0x3c), Z(0xb4), Z(0x2d), Z(0x99),
	Z(0x1c), Z(0x1f), Z(0x8c), Z(0x20), Z(0x03), Z(0x7c), Z(0x5f), Z(0xad),
	Z(0xf4), Z(0xfa), Z(0x95), Z(0xca), Z(0x76), Z(0x44), Z(0xcd), Z(0xb6),
	Z(0xb8), Z(0xa1), Z(0xa1), Z(0xbe), Z(0x9e), Z(0x54), Z(0x8f), Z(0x0b),
	Z(0x16), Z(0x74), Z(0x31), Z(0x8a), Z(0x23), Z(0x17), Z(0x04), Z(0xfa),
	Z(0x79), Z(0x84), Z(0xb1), Z(0xf5), Z(0x13), Z(0xab), Z(0xb5), Z(0x2e),
	Z(0xaa), Z(0x0c), Z(0x60), Z(0x6b), Z(0x5b), Z(0xc4), Z(0x4b), Z(0xbc),
	Z(0xe2), Z(0xaf), Z(0x45), Z(0x73), Z(0xfa), Z(0xc9), Z(0x49), Z(0xcd),
	Z(0x00), Z(0x92), Z(0x7d), Z(0x97), Z(0x7a), Z(0x18), Z(0x60), Z(0x3d),
	Z(0xcf), Z(0x5b), Z(0xde), Z(0xc6), Z(0xe2), Z(0xe6), Z(0xbb), Z(0x8b),
	Z(0x06), Z(0xda), Z(0x08), Z(0x15), Z(0x1b), Z(0x88), Z(0x6a), Z(0x17),
	Z(0x89), Z(0xd0), Z(0xa9), Z(0xc1), Z(0xc9), Z(0x70), Z(0x6b), Z(0xe5),
	Z(0x43), Z(0xf4), Z(0x68), Z(0xc8), Z(0xd3), Z(0x84), Z(0x28), Z(0x0a),
	Z(0x52), Z(0x66), Z(0xa3), Z(0xca), Z(0xf2), Z(0xe3), Z(0x7f), Z(0x7a),
	Z(0x31), Z(0xf7), Z(0x88), Z(0x94), Z(0x5e), Z(0x9c), Z(0x63), Z(0xd5),
	Z(0x24), Z(0x66), Z(0xfc), Z(0xb3), Z(0x57), Z(0x25), Z(0xbe), Z(0x89),
	Z(0x44), Z(0xc4), Z(0xe0), Z(0x8f), Z(0x23), Z(0x3c), Z(0x12), Z(0x52),
	Z(0xf5), Z(0x1e), Z(0xf4), Z(0xcb), Z(0x18), Z(0x33), Z(0x1f), Z(0xf8),
	Z(0x69), Z(0x10), Z(0x9d), Z(0xd3), Z(0xf7), Z(0x28), Z(0xf8), Z(0x30),
	Z(0x05), Z(0x5e), Z(0x32), Z(0xc0), Z(0xd5), Z(0x19), Z(0xbd), Z(0x45),
	Z(0x8b), Z(0x5b), Z(0xfd), Z(0xbc), Z(0xe2), Z(0x5c), Z(0xa9), Z(0x96),
	Z(0xef), Z(0x70), Z(0xcf), Z(0xc2), Z(0x2a), Z(0xb3), Z(0x61), Z(0xad),
	Z(0x80), Z(0x48), Z(0x81), Z(0xb7), Z(0x1d), Z(0x43), Z(0xd9), Z(0xd7),
	Z(0x45), Z(0xf0), Z(0xd8), Z(0x8a), Z(0x59), Z(0x7c), Z(0x57), Z(0xc1),
	Z(0x79), Z(0xc7), Z(0x34), Z(0xd6), Z(0x43), Z(0xdf), Z(0xe4), Z(0x78),
	Z(0x16), Z(0x06), Z(0xda), Z(0x92), Z(0x76), Z(0x51), Z(0xe1), Z(0xd4),
	Z(0x70), Z(0x03), Z(0xe0), Z(0x2f), Z(0x96), Z(0x91), Z(0x82), Z(0x80)
};

#undef Z
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#define Z(x) cpu_to_be32(x << 11)
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static const __be32 sbox2[256] = {
152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186
	Z(0xf0), Z(0x37), Z(0x24), Z(0x53), Z(0x2a), Z(0x03), Z(0x83), Z(0x86),
	Z(0xd1), Z(0xec), Z(0x50), Z(0xf0), Z(0x42), Z(0x78), Z(0x2f), Z(0x6d),
	Z(0xbf), Z(0x80), Z(0x87), Z(0x27), Z(0x95), Z(0xe2), Z(0xc5), Z(0x5d),
	Z(0xf9), Z(0x6f), Z(0xdb), Z(0xb4), Z(0x65), Z(0x6e), Z(0xe7), Z(0x24),
	Z(0xc8), Z(0x1a), Z(0xbb), Z(0x49), Z(0xb5), Z(0x0a), Z(0x7d), Z(0xb9),
	Z(0xe8), Z(0xdc), Z(0xb7), Z(0xd9), Z(0x45), Z(0x20), Z(0x1b), Z(0xce),
	Z(0x59), Z(0x9d), Z(0x6b), Z(0xbd), Z(0x0e), Z(0x8f), Z(0xa3), Z(0xa9),
	Z(0xbc), Z(0x74), Z(0xa6), Z(0xf6), Z(0x7f), Z(0x5f), Z(0xb1), Z(0x68),
	Z(0x84), Z(0xbc), Z(0xa9), Z(0xfd), Z(0x55), Z(0x50), Z(0xe9), Z(0xb6),
	Z(0x13), Z(0x5e), Z(0x07), Z(0xb8), Z(0x95), Z(0x02), Z(0xc0), Z(0xd0),
	Z(0x6a), Z(0x1a), Z(0x85), Z(0xbd), Z(0xb6), Z(0xfd), Z(0xfe), Z(0x17),
	Z(0x3f), Z(0x09), Z(0xa3), Z(0x8d), Z(0xfb), Z(0xed), Z(0xda), Z(0x1d),
	Z(0x6d), Z(0x1c), Z(0x6c), Z(0x01), Z(0x5a), Z(0xe5), Z(0x71), Z(0x3e),
	Z(0x8b), Z(0x6b), Z(0xbe), Z(0x29), Z(0xeb), Z(0x12), Z(0x19), Z(0x34),
	Z(0xcd), Z(0xb3), Z(0xbd), Z(0x35), Z(0xea), Z(0x4b), Z(0xd5), Z(0xae),
	Z(0x2a), Z(0x79), Z(0x5a), Z(0xa5), Z(0x32), Z(0x12), Z(0x7b), Z(0xdc),
	Z(0x2c), Z(0xd0), Z(0x22), Z(0x4b), Z(0xb1), Z(0x85), Z(0x59), Z(0x80),
	Z(0xc0), Z(0x30), Z(0x9f), Z(0x73), Z(0xd3), Z(0x14), Z(0x48), Z(0x40),
	Z(0x07), Z(0x2d), Z(0x8f), Z(0x80), Z(0x0f), Z(0xce), Z(0x0b), Z(0x5e),
	Z(0xb7), Z(0x5e), Z(0xac), Z(0x24), Z(0x94), Z(0x4a), Z(0x18), Z(0x15),
	Z(0x05), Z(0xe8), Z(0x02), Z(0x77), Z(0xa9), Z(0xc7), Z(0x40), Z(0x45),
	Z(0x89), Z(0xd1), Z(0xea), Z(0xde), Z(0x0c), Z(0x79), Z(0x2a), Z(0x99),
	Z(0x6c), Z(0x3e), Z(0x95), Z(0xdd), Z(0x8c), Z(0x7d), Z(0xad), Z(0x6f),
	Z(0xdc), Z(0xff), Z(0xfd), Z(0x62), Z(0x47), Z(0xb3), Z(0x21), Z(0x8a),
	Z(0xec), Z(0x8e), Z(0x19), Z(0x18), Z(0xb4), Z(0x6e), Z(0x3d), Z(0xfd),
	Z(0x74), Z(0x54), Z(0x1e), Z(0x04), Z(0x85), Z(0xd8), Z(0xbc), Z(0x1f),
	Z(0x56), Z(0xe7), Z(0x3a), Z(0x56), Z(0x67), Z(0xd6), Z(0xc8), Z(0xa5),
	Z(0xf3), Z(0x8e), Z(0xde), Z(0xae), Z(0x37), Z(0x49), Z(0xb7), Z(0xfa),
	Z(0xc8), Z(0xf4), Z(0x1f), Z(0xe0), Z(0x2a), Z(0x9b), Z(0x15), Z(0xd1),
	Z(0x34), Z(0x0e), Z(0xb5), Z(0xe0), Z(0x44), Z(0x78), Z(0x84), Z(0x59),
	Z(0x56), Z(0x68), Z(0x77), Z(0xa5), Z(0x14), Z(0x06), Z(0xf5), Z(0x2f),
	Z(0x8c), Z(0x8a), Z(0x73), Z(0x80), Z(0x76), Z(0xb4), Z(0x10), Z(0x86)
};

#undef Z
187
#define Z(x) cpu_to_be32(x << 19)
188
static const __be32 sbox3[256] = {
189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227
	Z(0xa9), Z(0x2a), Z(0x48), Z(0x51), Z(0x84), Z(0x7e), Z(0x49), Z(0xe2),
	Z(0xb5), Z(0xb7), Z(0x42), Z(0x33), Z(0x7d), Z(0x5d), Z(0xa6), Z(0x12),
	Z(0x44), Z(0x48), Z(0x6d), Z(0x28), Z(0xaa), Z(0x20), Z(0x6d), Z(0x57),
	Z(0xd6), Z(0x6b), Z(0x5d), Z(0x72), Z(0xf0), Z(0x92), Z(0x5a), Z(0x1b),
	Z(0x53), Z(0x80), Z(0x24), Z(0x70), Z(0x9a), Z(0xcc), Z(0xa7), Z(0x66),
	Z(0xa1), Z(0x01), Z(0xa5), Z(0x41), Z(0x97), Z(0x41), Z(0x31), Z(0x82),
	Z(0xf1), Z(0x14), Z(0xcf), Z(0x53), Z(0x0d), Z(0xa0), Z(0x10), Z(0xcc),
	Z(0x2a), Z(0x7d), Z(0xd2), Z(0xbf), Z(0x4b), Z(0x1a), Z(0xdb), Z(0x16),
	Z(0x47), Z(0xf6), Z(0x51), Z(0x36), Z(0xed), Z(0xf3), Z(0xb9), Z(0x1a),
	Z(0xa7), Z(0xdf), Z(0x29), Z(0x43), Z(0x01), Z(0x54), Z(0x70), Z(0xa4),
	Z(0xbf), Z(0xd4), Z(0x0b), Z(0x53), Z(0x44), Z(0x60), Z(0x9e), Z(0x23),
	Z(0xa1), Z(0x18), Z(0x68), Z(0x4f), Z(0xf0), Z(0x2f), Z(0x82), Z(0xc2),
	Z(0x2a), Z(0x41), Z(0xb2), Z(0x42), Z(0x0c), Z(0xed), Z(0x0c), Z(0x1d),
	Z(0x13), Z(0x3a), Z(0x3c), Z(0x6e), Z(0x35), Z(0xdc), Z(0x60), Z(0x65),
	Z(0x85), Z(0xe9), Z(0x64), Z(0x02), Z(0x9a), Z(0x3f), Z(0x9f), Z(0x87),
	Z(0x96), Z(0xdf), Z(0xbe), Z(0xf2), Z(0xcb), Z(0xe5), Z(0x6c), Z(0xd4),
	Z(0x5a), Z(0x83), Z(0xbf), Z(0x92), Z(0x1b), Z(0x94), Z(0x00), Z(0x42),
	Z(0xcf), Z(0x4b), Z(0x00), Z(0x75), Z(0xba), Z(0x8f), Z(0x76), Z(0x5f),
	Z(0x5d), Z(0x3a), Z(0x4d), Z(0x09), Z(0x12), Z(0x08), Z(0x38), Z(0x95),
	Z(0x17), Z(0xe4), Z(0x01), Z(0x1d), Z(0x4c), Z(0xa9), Z(0xcc), Z(0x85),
	Z(0x82), Z(0x4c), Z(0x9d), Z(0x2f), Z(0x3b), Z(0x66), Z(0xa1), Z(0x34),
	Z(0x10), Z(0xcd), Z(0x59), Z(0x89), Z(0xa5), Z(0x31), Z(0xcf), Z(0x05),
	Z(0xc8), Z(0x84), Z(0xfa), Z(0xc7), Z(0xba), Z(0x4e), Z(0x8b), Z(0x1a),
	Z(0x19), Z(0xf1), Z(0xa1), Z(0x3b), Z(0x18), Z(0x12), Z(0x17), Z(0xb0),
	Z(0x98), Z(0x8d), Z(0x0b), Z(0x23), Z(0xc3), Z(0x3a), Z(0x2d), Z(0x20),
	Z(0xdf), Z(0x13), Z(0xa0), Z(0xa8), Z(0x4c), Z(0x0d), Z(0x6c), Z(0x2f),
	Z(0x47), Z(0x13), Z(0x13), Z(0x52), Z(0x1f), Z(0x2d), Z(0xf5), Z(0x79),
	Z(0x3d), Z(0xa2), Z(0x54), Z(0xbd), Z(0x69), Z(0xc8), Z(0x6b), Z(0xf3),
	Z(0x05), Z(0x28), Z(0xf1), Z(0x16), Z(0x46), Z(0x40), Z(0xb0), Z(0x11),
	Z(0xd3), Z(0xb7), Z(0x95), Z(0x49), Z(0xcf), Z(0xc3), Z(0x1d), Z(0x8f),
	Z(0xd8), Z(0xe1), Z(0x73), Z(0xdb), Z(0xad), Z(0xc8), Z(0xc9), Z(0xa9),
	Z(0xa1), Z(0xc2), Z(0xc5), Z(0xe3), Z(0xba), Z(0xfc), Z(0x0e), Z(0x25)
};

/*
 * This is a 16 round Feistel network with permutation F_ENCRYPT
 */
#define F_ENCRYPT(R, L, sched)						\
do {									\
228
	union lc4 { __be32 l; u8 c[4]; } u;				\
229 230
	u.l = sched ^ R;						\
	L ^= sbox0[u.c[0]] ^ sbox1[u.c[1]] ^ sbox2[u.c[2]] ^ sbox3[u.c[3]]; \
231
} while (0)
232 233 234 235 236 237 238 239

/*
 * encryptor
 */
static void fcrypt_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	const struct fcrypt_ctx *ctx = crypto_tfm_ctx(tfm);
	struct {
240
		__be32 l, r;
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	} X;

	memcpy(&X, src, sizeof(X));

	F_ENCRYPT(X.r, X.l, ctx->sched[0x0]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0x1]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0x2]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0x3]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0x4]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0x5]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0x6]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0x7]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0x8]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0x9]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0xa]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0xb]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0xc]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0xd]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0xe]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0xf]);

	memcpy(dst, &X, sizeof(X));
}

/*
 * decryptor
 */
static void fcrypt_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
	const struct fcrypt_ctx *ctx = crypto_tfm_ctx(tfm);
	struct {
272
		__be32 l, r;
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	} X;

	memcpy(&X, src, sizeof(X));

	F_ENCRYPT(X.l, X.r, ctx->sched[0xf]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0xe]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0xd]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0xc]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0xb]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0xa]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0x9]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0x8]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0x7]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0x6]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0x5]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0x4]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0x3]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0x2]);
	F_ENCRYPT(X.l, X.r, ctx->sched[0x1]);
	F_ENCRYPT(X.r, X.l, ctx->sched[0x0]);

	memcpy(dst, &X, sizeof(X));
}

/*
 * Generate a key schedule from key, the least significant bit in each key byte
 * is parity and shall be ignored. This leaves 56 significant bits in the key
 * to scatter over the 16 key schedules. For each schedule extract the low
 * order 32 bits and use as schedule, then rotate right by 11 bits.
 */
static int fcrypt_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
{
	struct fcrypt_ctx *ctx = crypto_tfm_ctx(tfm);

#if BITS_PER_LONG == 64  /* the 64-bit version can also be used for 32-bit
			  * kernels - it seems to be faster but the code is
			  * larger */

	u64 k;	/* k holds all 56 non-parity bits */

	/* discard the parity bits */
	k = (*key++) >> 1;
	k <<= 7;
	k |= (*key++) >> 1;
	k <<= 7;
	k |= (*key++) >> 1;
	k <<= 7;
	k |= (*key++) >> 1;
	k <<= 7;
	k |= (*key++) >> 1;
	k <<= 7;
	k |= (*key++) >> 1;
	k <<= 7;
	k |= (*key++) >> 1;
	k <<= 7;
	k |= (*key) >> 1;

	/* Use lower 32 bits for schedule, rotate by 11 each round (16 times) */
331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346
	ctx->sched[0x0] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0x1] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0x2] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0x3] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0x4] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0x5] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0x6] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0x7] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0x8] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0x9] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0xa] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0xb] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0xc] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0xd] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0xe] = cpu_to_be32(k); ror56_64(k, 11);
	ctx->sched[0xf] = cpu_to_be32(k);
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	return 0;
#else
	u32 hi, lo;		/* hi is upper 24 bits and lo lower 32, total 56 */

	/* discard the parity bits */
	lo = (*key++) >> 1;
	lo <<= 7;
	lo |= (*key++) >> 1;
	lo <<= 7;
	lo |= (*key++) >> 1;
	lo <<= 7;
	lo |= (*key++) >> 1;
	hi = lo >> 4;
	lo &= 0xf;
	lo <<= 7;
	lo |= (*key++) >> 1;
	lo <<= 7;
	lo |= (*key++) >> 1;
	lo <<= 7;
	lo |= (*key++) >> 1;
	lo <<= 7;
	lo |= (*key) >> 1;

	/* Use lower 32 bits for schedule, rotate by 11 each round (16 times) */
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	ctx->sched[0x0] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0x1] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0x2] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0x3] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0x4] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0x5] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0x6] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0x7] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0x8] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0x9] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0xa] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0xb] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0xc] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0xd] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0xe] = cpu_to_be32(lo); ror56(hi, lo, 11);
	ctx->sched[0xf] = cpu_to_be32(lo);
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	return 0;
#endif
}

static struct crypto_alg fcrypt_alg = {
	.cra_name		=	"fcrypt",
	.cra_flags		=	CRYPTO_ALG_TYPE_CIPHER,
	.cra_blocksize		=	8,
	.cra_ctxsize		=	sizeof(struct fcrypt_ctx),
	.cra_module		=	THIS_MODULE,
	.cra_alignmask		=	3,
	.cra_u			=	{ .cipher = {
	.cia_min_keysize	=	8,
	.cia_max_keysize	=	8,
	.cia_setkey		=	fcrypt_setkey,
	.cia_encrypt		=	fcrypt_encrypt,
	.cia_decrypt		=	fcrypt_decrypt } }
};

407
static int __init fcrypt_mod_init(void)
408 409 410 411
{
	return crypto_register_alg(&fcrypt_alg);
}

412
static void __exit fcrypt_mod_fini(void)
413 414 415 416
{
	crypto_unregister_alg(&fcrypt_alg);
}

417 418
module_init(fcrypt_mod_init);
module_exit(fcrypt_mod_fini);
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MODULE_LICENSE("Dual BSD/GPL");
MODULE_DESCRIPTION("FCrypt Cipher Algorithm");
MODULE_AUTHOR("David Howells <dhowells@redhat.com>");
423
MODULE_ALIAS_CRYPTO("fcrypt");