| /* 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: |
| * |
| * Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan |
| * (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 { |
| __be32 sched[ROUNDS]; |
| }; |
| |
| /* 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)); \ |
| } while (0) |
| |
| /* 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)); \ |
| } while (0) |
| |
| /* |
| * Sboxes for Feistel network derived from |
| * /afs/transarc.com/public/afsps/afs.rel31b.export-src/rxkad/sboxes.h |
| */ |
| #undef Z |
| #define Z(x) cpu_to_be32(x << 3) |
| static const __be32 sbox0[256] = { |
| 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 |
| #define Z(x) cpu_to_be32(((x & 0x1f) << 27) | (x >> 5)) |
| static const __be32 sbox1[256] = { |
| 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 |
| #define Z(x) cpu_to_be32(x << 11) |
| static const __be32 sbox2[256] = { |
| 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 |
| #define Z(x) cpu_to_be32(x << 19) |
| static const __be32 sbox3[256] = { |
| 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 { \ |
| union lc4 { __be32 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 { |
| __be32 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 { |
| __be32 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] = 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); |
| |
| 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] = 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); |
| return 0; |
| #endif |
| } |
| |
| static struct crypto_alg fcrypt_alg = { |
| .cra_name = "fcrypt", |
| .cra_driver_name = "fcrypt-generic", |
| .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
| .cra_blocksize = 8, |
| .cra_ctxsize = sizeof(struct fcrypt_ctx), |
| .cra_module = THIS_MODULE, |
| .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 fcrypt_mod_init(void) |
| { |
| return crypto_register_alg(&fcrypt_alg); |
| } |
| |
| static void __exit fcrypt_mod_fini(void) |
| { |
| crypto_unregister_alg(&fcrypt_alg); |
| } |
| |
| subsys_initcall(fcrypt_mod_init); |
| module_exit(fcrypt_mod_fini); |
| |
| MODULE_LICENSE("Dual BSD/GPL"); |
| MODULE_DESCRIPTION("FCrypt Cipher Algorithm"); |
| MODULE_AUTHOR("David Howells <dhowells@redhat.com>"); |
| MODULE_ALIAS_CRYPTO("fcrypt"); |
