| /* 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 <kunit/visibility.h> | |
| #include <linux/export.h> | |
| #include <linux/unaligned.h> | |
| #include "ar-internal.h" | |
| /* | |
| * 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) | |
| }; | |
| union fcrypt_block { | |
| __be64 a; | |
| struct { | |
| __be32 l, r; | |
| }; | |
| }; | |
| #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) | |
| /* Encrypt one block using FCrypt. */ | |
| static __be64 fcrypt_encrypt(const struct fcrypt_key *key, __be64 ptext) | |
| { | |
| union fcrypt_block X = { .a = ptext }; | |
| /* This is a 16 round Feistel network with permutation F_ENCRYPT. */ | |
| F_ENCRYPT(X.r, X.l, key->sched[0x0]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0x1]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0x2]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0x3]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0x4]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0x5]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0x6]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0x7]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0x8]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0x9]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0xa]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0xb]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0xc]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0xd]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0xe]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0xf]); | |
| return X.a; | |
| } | |
| /* Decrypt one block using FCrypt. */ | |
| static __be64 fcrypt_decrypt(const struct fcrypt_key *key, __be64 ctext) | |
| { | |
| union fcrypt_block X = { .a = ctext }; | |
| /* This is a 16 round Feistel network with permutation F_ENCRYPT. */ | |
| F_ENCRYPT(X.l, X.r, key->sched[0xf]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0xe]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0xd]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0xc]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0xb]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0xa]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0x9]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0x8]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0x7]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0x6]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0x5]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0x4]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0x3]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0x2]); | |
| F_ENCRYPT(X.l, X.r, key->sched[0x1]); | |
| F_ENCRYPT(X.r, X.l, key->sched[0x0]); | |
| return X.a; | |
| } | |
| /** | |
| * fcrypt_preparekey - Prepare a key for FCrypt encryption and decryption | |
| * @key: (out) The prepared key | |
| * @raw_key: The raw key as an 8-byte array | |
| * | |
| * This computes the FCrypt key schedule. | |
| */ | |
| void fcrypt_preparekey(struct fcrypt_key *key, const u8 raw_key[FCRYPT_BSIZE]) | |
| { | |
| u64 k = 0; | |
| /* Load the 56 non-parity bits of the key. Discard the parity bits. */ | |
| for (int i = 0; i < 8; i++) | |
| k = (k << 7) | (raw_key[i] >> 1); | |
| /* Generate the key schedule word for each round. */ | |
| for (int i = 0; i < FCRYPT_ROUNDS; i++) { | |
| key->sched[i] = cpu_to_be32(k); | |
| /* Rotate the low 56 bits of 'k' right by 11 bits. */ | |
| k = (k >> 11) | ((k & ((1 << 11) - 1)) << (56 - 11)); | |
| } | |
| } | |
| EXPORT_SYMBOL_IF_KUNIT(fcrypt_preparekey); | |
| /** | |
| * fcrypt_pcbc_encrypt - Encrypt data using FCrypt cipher in PCBC mode | |
| * @key: The key | |
| * @iv: The 8-byte initialization vector | |
| * @src: The source data | |
| * @dst: The destination data. Both in-place and out-of-place are supported. | |
| * @nblocks: The number of 8-byte blocks to encrypt | |
| * | |
| * WARNING: This cipher is insecure. Not only is the 56-bit key easily | |
| * brute-forced, the cipher itself is cryptographically weak and doesn't even | |
| * provide the intended 56-bit security level. It effectively just acts as an | |
| * obfuscation algorithm. It is supported only for backwards compatibility. | |
| */ | |
| void fcrypt_pcbc_encrypt(const struct fcrypt_key *key, | |
| const u8 iv[FCRYPT_BSIZE], const void *src, void *dst, | |
| size_t nblocks) | |
| { | |
| __be64 prev = get_unaligned((const __be64 *)iv); | |
| const __be64 *src_blocks = src; | |
| __be64 *dst_blocks = dst; | |
| while (nblocks--) { | |
| __be64 ptext, ctext; | |
| ptext = get_unaligned(src_blocks++); | |
| ctext = fcrypt_encrypt(key, prev ^ ptext); | |
| put_unaligned(ctext, dst_blocks++); | |
| prev = ptext ^ ctext; | |
| } | |
| } | |
| EXPORT_SYMBOL_IF_KUNIT(fcrypt_pcbc_encrypt); | |
| /** | |
| * fcrypt_pcbc_decrypt - Decrypt data using FCrypt cipher in PCBC mode | |
| * @key: The key | |
| * @iv: The 8-byte initialization vector | |
| * @src: The source data | |
| * @dst: The destination data. Both in-place and out-of-place are supported. | |
| * @nblocks: The number of 8-byte blocks to decrypt | |
| */ | |
| void fcrypt_pcbc_decrypt(const struct fcrypt_key *key, | |
| const u8 iv[FCRYPT_BSIZE], const void *src, void *dst, | |
| size_t nblocks) | |
| { | |
| __be64 prev = get_unaligned((const __be64 *)iv); | |
| const __be64 *src_blocks = src; | |
| __be64 *dst_blocks = dst; | |
| while (nblocks--) { | |
| __be64 ptext, ctext; | |
| ctext = get_unaligned(src_blocks++); | |
| ptext = prev ^ fcrypt_decrypt(key, ctext); | |
| put_unaligned(ptext, dst_blocks++); | |
| prev = ptext ^ ctext; | |
| } | |
| } | |
| EXPORT_SYMBOL_IF_KUNIT(fcrypt_pcbc_decrypt); |