424 lines
18 KiB
C
424 lines
18 KiB
C
/* FCrypt encryption algorithm
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*
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* Copyright (C) 2006 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Based on code:
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*
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* Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <asm/byteorder.h>
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#include <linux/bitops.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/crypto.h>
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#define ROUNDS 16
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struct fcrypt_ctx {
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u32 sched[ROUNDS];
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};
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/* Rotate right two 32 bit numbers as a 56 bit number */
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#define ror56(hi, lo, n) \
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do { \
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u32 t = lo & ((1 << n) - 1); \
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lo = (lo >> n) | ((hi & ((1 << n) - 1)) << (32 - n)); \
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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 */
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#define ror56_64(k, n) \
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do { \
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k = (k >> n) | ((k & ((1 << n) - 1)) << (56 - n)); \
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} while(0)
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/*
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* Sboxes for Feistel network derived from
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* /afs/transarc.com/public/afsps/afs.rel31b.export-src/rxkad/sboxes.h
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*/
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#undef Z
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#define Z(x) __constant_be32_to_cpu(x << 3)
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static const u32 sbox0[256] = {
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Z(0xea), Z(0x7f), Z(0xb2), Z(0x64), Z(0x9d), Z(0xb0), Z(0xd9), Z(0x11),
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Z(0xcd), Z(0x86), Z(0x86), Z(0x91), Z(0x0a), Z(0xb2), Z(0x93), Z(0x06),
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Z(0x0e), Z(0x06), Z(0xd2), Z(0x65), Z(0x73), Z(0xc5), Z(0x28), Z(0x60),
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Z(0xf2), Z(0x20), Z(0xb5), Z(0x38), Z(0x7e), Z(0xda), Z(0x9f), Z(0xe3),
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Z(0xd2), Z(0xcf), Z(0xc4), Z(0x3c), Z(0x61), Z(0xff), Z(0x4a), Z(0x4a),
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Z(0x35), Z(0xac), Z(0xaa), Z(0x5f), Z(0x2b), Z(0xbb), Z(0xbc), Z(0x53),
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Z(0x4e), Z(0x9d), Z(0x78), Z(0xa3), Z(0xdc), Z(0x09), Z(0x32), Z(0x10),
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Z(0xc6), Z(0x6f), Z(0x66), Z(0xd6), Z(0xab), Z(0xa9), Z(0xaf), Z(0xfd),
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Z(0x3b), Z(0x95), Z(0xe8), Z(0x34), Z(0x9a), Z(0x81), Z(0x72), Z(0x80),
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Z(0x9c), Z(0xf3), Z(0xec), Z(0xda), Z(0x9f), Z(0x26), Z(0x76), Z(0x15),
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Z(0x3e), Z(0x55), Z(0x4d), Z(0xde), Z(0x84), Z(0xee), Z(0xad), Z(0xc7),
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Z(0xf1), Z(0x6b), Z(0x3d), Z(0xd3), Z(0x04), Z(0x49), Z(0xaa), Z(0x24),
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Z(0x0b), Z(0x8a), Z(0x83), Z(0xba), Z(0xfa), Z(0x85), Z(0xa0), Z(0xa8),
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Z(0xb1), Z(0xd4), Z(0x01), Z(0xd8), Z(0x70), Z(0x64), Z(0xf0), Z(0x51),
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Z(0xd2), Z(0xc3), Z(0xa7), Z(0x75), Z(0x8c), Z(0xa5), Z(0x64), Z(0xef),
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Z(0x10), Z(0x4e), Z(0xb7), Z(0xc6), Z(0x61), Z(0x03), Z(0xeb), Z(0x44),
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Z(0x3d), Z(0xe5), Z(0xb3), Z(0x5b), Z(0xae), Z(0xd5), Z(0xad), Z(0x1d),
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Z(0xfa), Z(0x5a), Z(0x1e), Z(0x33), Z(0xab), Z(0x93), Z(0xa2), Z(0xb7),
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Z(0xe7), Z(0xa8), Z(0x45), Z(0xa4), Z(0xcd), Z(0x29), Z(0x63), Z(0x44),
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Z(0xb6), Z(0x69), Z(0x7e), Z(0x2e), Z(0x62), Z(0x03), Z(0xc8), Z(0xe0),
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Z(0x17), Z(0xbb), Z(0xc7), Z(0xf3), Z(0x3f), Z(0x36), Z(0xba), Z(0x71),
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Z(0x8e), Z(0x97), Z(0x65), Z(0x60), Z(0x69), Z(0xb6), Z(0xf6), Z(0xe6),
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Z(0x6e), Z(0xe0), Z(0x81), Z(0x59), Z(0xe8), Z(0xaf), Z(0xdd), Z(0x95),
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Z(0x22), Z(0x99), Z(0xfd), Z(0x63), Z(0x19), Z(0x74), Z(0x61), Z(0xb1),
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Z(0xb6), Z(0x5b), Z(0xae), Z(0x54), Z(0xb3), Z(0x70), Z(0xff), Z(0xc6),
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Z(0x3b), Z(0x3e), Z(0xc1), Z(0xd7), Z(0xe1), Z(0x0e), Z(0x76), Z(0xe5),
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Z(0x36), Z(0x4f), Z(0x59), Z(0xc7), Z(0x08), Z(0x6e), Z(0x82), Z(0xa6),
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Z(0x93), Z(0xc4), Z(0xaa), Z(0x26), Z(0x49), Z(0xe0), Z(0x21), Z(0x64),
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Z(0x07), Z(0x9f), Z(0x64), Z(0x81), Z(0x9c), Z(0xbf), Z(0xf9), Z(0xd1),
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Z(0x43), Z(0xf8), Z(0xb6), Z(0xb9), Z(0xf1), Z(0x24), Z(0x75), Z(0x03),
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Z(0xe4), Z(0xb0), Z(0x99), Z(0x46), Z(0x3d), Z(0xf5), Z(0xd1), Z(0x39),
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Z(0x72), Z(0x12), Z(0xf6), Z(0xba), Z(0x0c), Z(0x0d), Z(0x42), Z(0x2e)
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};
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#undef Z
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#define Z(x) __constant_be32_to_cpu((x << 27) | (x >> 5))
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static const u32 sbox1[256] = {
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Z(0x77), Z(0x14), Z(0xa6), Z(0xfe), Z(0xb2), Z(0x5e), Z(0x8c), Z(0x3e),
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Z(0x67), Z(0x6c), Z(0xa1), Z(0x0d), Z(0xc2), Z(0xa2), Z(0xc1), Z(0x85),
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Z(0x6c), Z(0x7b), Z(0x67), Z(0xc6), Z(0x23), Z(0xe3), Z(0xf2), Z(0x89),
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Z(0x50), Z(0x9c), Z(0x03), Z(0xb7), Z(0x73), Z(0xe6), Z(0xe1), Z(0x39),
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Z(0x31), Z(0x2c), Z(0x27), Z(0x9f), Z(0xa5), Z(0x69), Z(0x44), Z(0xd6),
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Z(0x23), Z(0x83), Z(0x98), Z(0x7d), Z(0x3c), Z(0xb4), Z(0x2d), Z(0x99),
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Z(0x1c), Z(0x1f), Z(0x8c), Z(0x20), Z(0x03), Z(0x7c), Z(0x5f), Z(0xad),
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Z(0xf4), Z(0xfa), Z(0x95), Z(0xca), Z(0x76), Z(0x44), Z(0xcd), Z(0xb6),
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Z(0xb8), Z(0xa1), Z(0xa1), Z(0xbe), Z(0x9e), Z(0x54), Z(0x8f), Z(0x0b),
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Z(0x16), Z(0x74), Z(0x31), Z(0x8a), Z(0x23), Z(0x17), Z(0x04), Z(0xfa),
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Z(0x79), Z(0x84), Z(0xb1), Z(0xf5), Z(0x13), Z(0xab), Z(0xb5), Z(0x2e),
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Z(0xaa), Z(0x0c), Z(0x60), Z(0x6b), Z(0x5b), Z(0xc4), Z(0x4b), Z(0xbc),
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Z(0xe2), Z(0xaf), Z(0x45), Z(0x73), Z(0xfa), Z(0xc9), Z(0x49), Z(0xcd),
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Z(0x00), Z(0x92), Z(0x7d), Z(0x97), Z(0x7a), Z(0x18), Z(0x60), Z(0x3d),
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Z(0xcf), Z(0x5b), Z(0xde), Z(0xc6), Z(0xe2), Z(0xe6), Z(0xbb), Z(0x8b),
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Z(0x06), Z(0xda), Z(0x08), Z(0x15), Z(0x1b), Z(0x88), Z(0x6a), Z(0x17),
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Z(0x89), Z(0xd0), Z(0xa9), Z(0xc1), Z(0xc9), Z(0x70), Z(0x6b), Z(0xe5),
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Z(0x43), Z(0xf4), Z(0x68), Z(0xc8), Z(0xd3), Z(0x84), Z(0x28), Z(0x0a),
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Z(0x52), Z(0x66), Z(0xa3), Z(0xca), Z(0xf2), Z(0xe3), Z(0x7f), Z(0x7a),
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Z(0x31), Z(0xf7), Z(0x88), Z(0x94), Z(0x5e), Z(0x9c), Z(0x63), Z(0xd5),
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Z(0x24), Z(0x66), Z(0xfc), Z(0xb3), Z(0x57), Z(0x25), Z(0xbe), Z(0x89),
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Z(0x44), Z(0xc4), Z(0xe0), Z(0x8f), Z(0x23), Z(0x3c), Z(0x12), Z(0x52),
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Z(0xf5), Z(0x1e), Z(0xf4), Z(0xcb), Z(0x18), Z(0x33), Z(0x1f), Z(0xf8),
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Z(0x69), Z(0x10), Z(0x9d), Z(0xd3), Z(0xf7), Z(0x28), Z(0xf8), Z(0x30),
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Z(0x05), Z(0x5e), Z(0x32), Z(0xc0), Z(0xd5), Z(0x19), Z(0xbd), Z(0x45),
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Z(0x8b), Z(0x5b), Z(0xfd), Z(0xbc), Z(0xe2), Z(0x5c), Z(0xa9), Z(0x96),
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Z(0xef), Z(0x70), Z(0xcf), Z(0xc2), Z(0x2a), Z(0xb3), Z(0x61), Z(0xad),
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Z(0x80), Z(0x48), Z(0x81), Z(0xb7), Z(0x1d), Z(0x43), Z(0xd9), Z(0xd7),
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Z(0x45), Z(0xf0), Z(0xd8), Z(0x8a), Z(0x59), Z(0x7c), Z(0x57), Z(0xc1),
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Z(0x79), Z(0xc7), Z(0x34), Z(0xd6), Z(0x43), Z(0xdf), Z(0xe4), Z(0x78),
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Z(0x16), Z(0x06), Z(0xda), Z(0x92), Z(0x76), Z(0x51), Z(0xe1), Z(0xd4),
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Z(0x70), Z(0x03), Z(0xe0), Z(0x2f), Z(0x96), Z(0x91), Z(0x82), Z(0x80)
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};
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#undef Z
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#define Z(x) __constant_be32_to_cpu(x << 11)
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static const u32 sbox2[256] = {
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Z(0xf0), Z(0x37), Z(0x24), Z(0x53), Z(0x2a), Z(0x03), Z(0x83), Z(0x86),
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Z(0xd1), Z(0xec), Z(0x50), Z(0xf0), Z(0x42), Z(0x78), Z(0x2f), Z(0x6d),
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Z(0xbf), Z(0x80), Z(0x87), Z(0x27), Z(0x95), Z(0xe2), Z(0xc5), Z(0x5d),
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Z(0xf9), Z(0x6f), Z(0xdb), Z(0xb4), Z(0x65), Z(0x6e), Z(0xe7), Z(0x24),
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Z(0xc8), Z(0x1a), Z(0xbb), Z(0x49), Z(0xb5), Z(0x0a), Z(0x7d), Z(0xb9),
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Z(0xe8), Z(0xdc), Z(0xb7), Z(0xd9), Z(0x45), Z(0x20), Z(0x1b), Z(0xce),
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Z(0x59), Z(0x9d), Z(0x6b), Z(0xbd), Z(0x0e), Z(0x8f), Z(0xa3), Z(0xa9),
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Z(0xbc), Z(0x74), Z(0xa6), Z(0xf6), Z(0x7f), Z(0x5f), Z(0xb1), Z(0x68),
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Z(0x84), Z(0xbc), Z(0xa9), Z(0xfd), Z(0x55), Z(0x50), Z(0xe9), Z(0xb6),
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Z(0x13), Z(0x5e), Z(0x07), Z(0xb8), Z(0x95), Z(0x02), Z(0xc0), Z(0xd0),
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Z(0x6a), Z(0x1a), Z(0x85), Z(0xbd), Z(0xb6), Z(0xfd), Z(0xfe), Z(0x17),
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Z(0x3f), Z(0x09), Z(0xa3), Z(0x8d), Z(0xfb), Z(0xed), Z(0xda), Z(0x1d),
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Z(0x6d), Z(0x1c), Z(0x6c), Z(0x01), Z(0x5a), Z(0xe5), Z(0x71), Z(0x3e),
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Z(0x8b), Z(0x6b), Z(0xbe), Z(0x29), Z(0xeb), Z(0x12), Z(0x19), Z(0x34),
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Z(0xcd), Z(0xb3), Z(0xbd), Z(0x35), Z(0xea), Z(0x4b), Z(0xd5), Z(0xae),
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Z(0x2a), Z(0x79), Z(0x5a), Z(0xa5), Z(0x32), Z(0x12), Z(0x7b), Z(0xdc),
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Z(0x2c), Z(0xd0), Z(0x22), Z(0x4b), Z(0xb1), Z(0x85), Z(0x59), Z(0x80),
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Z(0xc0), Z(0x30), Z(0x9f), Z(0x73), Z(0xd3), Z(0x14), Z(0x48), Z(0x40),
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Z(0x07), Z(0x2d), Z(0x8f), Z(0x80), Z(0x0f), Z(0xce), Z(0x0b), Z(0x5e),
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Z(0xb7), Z(0x5e), Z(0xac), Z(0x24), Z(0x94), Z(0x4a), Z(0x18), Z(0x15),
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Z(0x05), Z(0xe8), Z(0x02), Z(0x77), Z(0xa9), Z(0xc7), Z(0x40), Z(0x45),
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Z(0x89), Z(0xd1), Z(0xea), Z(0xde), Z(0x0c), Z(0x79), Z(0x2a), Z(0x99),
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Z(0x6c), Z(0x3e), Z(0x95), Z(0xdd), Z(0x8c), Z(0x7d), Z(0xad), Z(0x6f),
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Z(0xdc), Z(0xff), Z(0xfd), Z(0x62), Z(0x47), Z(0xb3), Z(0x21), Z(0x8a),
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Z(0xec), Z(0x8e), Z(0x19), Z(0x18), Z(0xb4), Z(0x6e), Z(0x3d), Z(0xfd),
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Z(0x74), Z(0x54), Z(0x1e), Z(0x04), Z(0x85), Z(0xd8), Z(0xbc), Z(0x1f),
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Z(0x56), Z(0xe7), Z(0x3a), Z(0x56), Z(0x67), Z(0xd6), Z(0xc8), Z(0xa5),
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Z(0xf3), Z(0x8e), Z(0xde), Z(0xae), Z(0x37), Z(0x49), Z(0xb7), Z(0xfa),
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Z(0xc8), Z(0xf4), Z(0x1f), Z(0xe0), Z(0x2a), Z(0x9b), Z(0x15), Z(0xd1),
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Z(0x34), Z(0x0e), Z(0xb5), Z(0xe0), Z(0x44), Z(0x78), Z(0x84), Z(0x59),
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Z(0x56), Z(0x68), Z(0x77), Z(0xa5), Z(0x14), Z(0x06), Z(0xf5), Z(0x2f),
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Z(0x8c), Z(0x8a), Z(0x73), Z(0x80), Z(0x76), Z(0xb4), Z(0x10), Z(0x86)
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};
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#undef Z
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#define Z(x) __constant_be32_to_cpu(x << 19)
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static const u32 sbox3[256] = {
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Z(0xa9), Z(0x2a), Z(0x48), Z(0x51), Z(0x84), Z(0x7e), Z(0x49), Z(0xe2),
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Z(0xb5), Z(0xb7), Z(0x42), Z(0x33), Z(0x7d), Z(0x5d), Z(0xa6), Z(0x12),
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Z(0x44), Z(0x48), Z(0x6d), Z(0x28), Z(0xaa), Z(0x20), Z(0x6d), Z(0x57),
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Z(0xd6), Z(0x6b), Z(0x5d), Z(0x72), Z(0xf0), Z(0x92), Z(0x5a), Z(0x1b),
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Z(0x53), Z(0x80), Z(0x24), Z(0x70), Z(0x9a), Z(0xcc), Z(0xa7), Z(0x66),
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Z(0xa1), Z(0x01), Z(0xa5), Z(0x41), Z(0x97), Z(0x41), Z(0x31), Z(0x82),
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Z(0xf1), Z(0x14), Z(0xcf), Z(0x53), Z(0x0d), Z(0xa0), Z(0x10), Z(0xcc),
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Z(0x2a), Z(0x7d), Z(0xd2), Z(0xbf), Z(0x4b), Z(0x1a), Z(0xdb), Z(0x16),
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Z(0x47), Z(0xf6), Z(0x51), Z(0x36), Z(0xed), Z(0xf3), Z(0xb9), Z(0x1a),
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Z(0xa7), Z(0xdf), Z(0x29), Z(0x43), Z(0x01), Z(0x54), Z(0x70), Z(0xa4),
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Z(0xbf), Z(0xd4), Z(0x0b), Z(0x53), Z(0x44), Z(0x60), Z(0x9e), Z(0x23),
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Z(0xa1), Z(0x18), Z(0x68), Z(0x4f), Z(0xf0), Z(0x2f), Z(0x82), Z(0xc2),
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Z(0x2a), Z(0x41), Z(0xb2), Z(0x42), Z(0x0c), Z(0xed), Z(0x0c), Z(0x1d),
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Z(0x13), Z(0x3a), Z(0x3c), Z(0x6e), Z(0x35), Z(0xdc), Z(0x60), Z(0x65),
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Z(0x85), Z(0xe9), Z(0x64), Z(0x02), Z(0x9a), Z(0x3f), Z(0x9f), Z(0x87),
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Z(0x96), Z(0xdf), Z(0xbe), Z(0xf2), Z(0xcb), Z(0xe5), Z(0x6c), Z(0xd4),
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Z(0x5a), Z(0x83), Z(0xbf), Z(0x92), Z(0x1b), Z(0x94), Z(0x00), Z(0x42),
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Z(0xcf), Z(0x4b), Z(0x00), Z(0x75), Z(0xba), Z(0x8f), Z(0x76), Z(0x5f),
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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 { \
|
|
union lc4 { u32 l; u8 c[4]; } u; \
|
|
u.l = sched ^ R; \
|
|
L ^= sbox0[u.c[0]] ^ sbox1[u.c[1]] ^ sbox2[u.c[2]] ^ sbox3[u.c[3]]; \
|
|
} while(0)
|
|
|
|
/*
|
|
* encryptor
|
|
*/
|
|
static void fcrypt_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
|
|
{
|
|
const struct fcrypt_ctx *ctx = crypto_tfm_ctx(tfm);
|
|
struct {
|
|
u32 l, r;
|
|
} 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 {
|
|
u32 l, r;
|
|
} 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) */
|
|
ctx->sched[0x0] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0x1] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0x2] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0x3] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0x4] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0x5] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0x6] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0x7] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0x8] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0x9] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0xa] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0xb] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0xc] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0xd] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0xe] = be32_to_cpu(k); ror56_64(k, 11);
|
|
ctx->sched[0xf] = be32_to_cpu(k);
|
|
|
|
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) */
|
|
ctx->sched[0x0] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0x1] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0x2] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0x3] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0x4] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0x5] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0x6] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0x7] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0x8] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0x9] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0xa] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0xb] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0xc] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0xd] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0xe] = be32_to_cpu(lo); ror56(hi, lo, 11);
|
|
ctx->sched[0xf] = be32_to_cpu(lo);
|
|
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_list = LIST_HEAD_INIT(fcrypt_alg.cra_list),
|
|
.cra_u = { .cipher = {
|
|
.cia_min_keysize = 8,
|
|
.cia_max_keysize = 8,
|
|
.cia_setkey = fcrypt_setkey,
|
|
.cia_encrypt = fcrypt_encrypt,
|
|
.cia_decrypt = fcrypt_decrypt } }
|
|
};
|
|
|
|
static int __init init(void)
|
|
{
|
|
return crypto_register_alg(&fcrypt_alg);
|
|
}
|
|
|
|
static void __exit fini(void)
|
|
{
|
|
crypto_unregister_alg(&fcrypt_alg);
|
|
}
|
|
|
|
module_init(init);
|
|
module_exit(fini);
|
|
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
MODULE_DESCRIPTION("FCrypt Cipher Algorithm");
|
|
MODULE_AUTHOR("David Howells <dhowells@redhat.com>");
|