1 | /* FCrypt encryption algorithm |
2 | * |
3 | * Copyright (C) 2006 Red Hat, Inc. All Rights Reserved. |
4 | * Written by David Howells (dhowells@redhat.com) |
5 | * |
6 | * This program is free software; you can redistribute it and/or |
7 | * modify it under the terms of the GNU General Public License |
8 | * as published by the Free Software Foundation; either version |
9 | * 2 of the License, or (at your option) any later version. |
10 | * |
11 | * Based on code: |
12 | * |
13 | * Copyright (c) 1995 - 2000 Kungliga Tekniska Högskolan |
14 | * (Royal Institute of Technology, Stockholm, Sweden). |
15 | * All rights reserved. |
16 | * |
17 | * Redistribution and use in source and binary forms, with or without |
18 | * modification, are permitted provided that the following conditions |
19 | * are met: |
20 | * |
21 | * 1. Redistributions of source code must retain the above copyright |
22 | * notice, this list of conditions and the following disclaimer. |
23 | * |
24 | * 2. Redistributions in binary form must reproduce the above copyright |
25 | * notice, this list of conditions and the following disclaimer in the |
26 | * documentation and/or other materials provided with the distribution. |
27 | * |
28 | * 3. Neither the name of the Institute nor the names of its contributors |
29 | * may be used to endorse or promote products derived from this software |
30 | * without specific prior written permission. |
31 | * |
32 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND |
33 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
34 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
35 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE |
36 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
37 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
38 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
39 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
40 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
41 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
42 | * SUCH DAMAGE. |
43 | */ |
44 | |
45 | #include <asm/byteorder.h> |
46 | #include <crypto/algapi.h> |
47 | #include <linux/bitops.h> |
48 | #include <linux/init.h> |
49 | #include <linux/module.h> |
50 | |
51 | #define ROUNDS 16 |
52 | |
53 | struct fcrypt_ctx { |
54 | __be32 sched[ROUNDS]; |
55 | }; |
56 | |
57 | /* Rotate right two 32 bit numbers as a 56 bit number */ |
58 | #define ror56(hi, lo, n) \ |
59 | do { \ |
60 | u32 t = lo & ((1 << n) - 1); \ |
61 | lo = (lo >> n) | ((hi & ((1 << n) - 1)) << (32 - n)); \ |
62 | hi = (hi >> n) | (t << (24-n)); \ |
63 | } while (0) |
64 | |
65 | /* Rotate right one 64 bit number as a 56 bit number */ |
66 | #define ror56_64(k, n) (k = (k >> n) | ((k & ((1 << n) - 1)) << (56 - n))) |
67 | |
68 | /* |
69 | * Sboxes for Feistel network derived from |
70 | * /afs/transarc.com/public/afsps/afs.rel31b.export-src/rxkad/sboxes.h |
71 | */ |
72 | #undef Z |
73 | #define Z(x) cpu_to_be32(x << 3) |
74 | static const __be32 sbox0[256] = { |
75 | Z(0xea), Z(0x7f), Z(0xb2), Z(0x64), Z(0x9d), Z(0xb0), Z(0xd9), Z(0x11), |
76 | Z(0xcd), Z(0x86), Z(0x86), Z(0x91), Z(0x0a), Z(0xb2), Z(0x93), Z(0x06), |
77 | Z(0x0e), Z(0x06), Z(0xd2), Z(0x65), Z(0x73), Z(0xc5), Z(0x28), Z(0x60), |
78 | Z(0xf2), Z(0x20), Z(0xb5), Z(0x38), Z(0x7e), Z(0xda), Z(0x9f), Z(0xe3), |
79 | Z(0xd2), Z(0xcf), Z(0xc4), Z(0x3c), Z(0x61), Z(0xff), Z(0x4a), Z(0x4a), |
80 | Z(0x35), Z(0xac), Z(0xaa), Z(0x5f), Z(0x2b), Z(0xbb), Z(0xbc), Z(0x53), |
81 | Z(0x4e), Z(0x9d), Z(0x78), Z(0xa3), Z(0xdc), Z(0x09), Z(0x32), Z(0x10), |
82 | Z(0xc6), Z(0x6f), Z(0x66), Z(0xd6), Z(0xab), Z(0xa9), Z(0xaf), Z(0xfd), |
83 | Z(0x3b), Z(0x95), Z(0xe8), Z(0x34), Z(0x9a), Z(0x81), Z(0x72), Z(0x80), |
84 | Z(0x9c), Z(0xf3), Z(0xec), Z(0xda), Z(0x9f), Z(0x26), Z(0x76), Z(0x15), |
85 | Z(0x3e), Z(0x55), Z(0x4d), Z(0xde), Z(0x84), Z(0xee), Z(0xad), Z(0xc7), |
86 | Z(0xf1), Z(0x6b), Z(0x3d), Z(0xd3), Z(0x04), Z(0x49), Z(0xaa), Z(0x24), |
87 | Z(0x0b), Z(0x8a), Z(0x83), Z(0xba), Z(0xfa), Z(0x85), Z(0xa0), Z(0xa8), |
88 | Z(0xb1), Z(0xd4), Z(0x01), Z(0xd8), Z(0x70), Z(0x64), Z(0xf0), Z(0x51), |
89 | Z(0xd2), Z(0xc3), Z(0xa7), Z(0x75), Z(0x8c), Z(0xa5), Z(0x64), Z(0xef), |
90 | Z(0x10), Z(0x4e), Z(0xb7), Z(0xc6), Z(0x61), Z(0x03), Z(0xeb), Z(0x44), |
91 | Z(0x3d), Z(0xe5), Z(0xb3), Z(0x5b), Z(0xae), Z(0xd5), Z(0xad), Z(0x1d), |
92 | Z(0xfa), Z(0x5a), Z(0x1e), Z(0x33), Z(0xab), Z(0x93), Z(0xa2), Z(0xb7), |
93 | Z(0xe7), Z(0xa8), Z(0x45), Z(0xa4), Z(0xcd), Z(0x29), Z(0x63), Z(0x44), |
94 | Z(0xb6), Z(0x69), Z(0x7e), Z(0x2e), Z(0x62), Z(0x03), Z(0xc8), Z(0xe0), |
95 | Z(0x17), Z(0xbb), Z(0xc7), Z(0xf3), Z(0x3f), Z(0x36), Z(0xba), Z(0x71), |
96 | Z(0x8e), Z(0x97), Z(0x65), Z(0x60), Z(0x69), Z(0xb6), Z(0xf6), Z(0xe6), |
97 | Z(0x6e), Z(0xe0), Z(0x81), Z(0x59), Z(0xe8), Z(0xaf), Z(0xdd), Z(0x95), |
98 | Z(0x22), Z(0x99), Z(0xfd), Z(0x63), Z(0x19), Z(0x74), Z(0x61), Z(0xb1), |
99 | Z(0xb6), Z(0x5b), Z(0xae), Z(0x54), Z(0xb3), Z(0x70), Z(0xff), Z(0xc6), |
100 | Z(0x3b), Z(0x3e), Z(0xc1), Z(0xd7), Z(0xe1), Z(0x0e), Z(0x76), Z(0xe5), |
101 | Z(0x36), Z(0x4f), Z(0x59), Z(0xc7), Z(0x08), Z(0x6e), Z(0x82), Z(0xa6), |
102 | Z(0x93), Z(0xc4), Z(0xaa), Z(0x26), Z(0x49), Z(0xe0), Z(0x21), Z(0x64), |
103 | Z(0x07), Z(0x9f), Z(0x64), Z(0x81), Z(0x9c), Z(0xbf), Z(0xf9), Z(0xd1), |
104 | Z(0x43), Z(0xf8), Z(0xb6), Z(0xb9), Z(0xf1), Z(0x24), Z(0x75), Z(0x03), |
105 | Z(0xe4), Z(0xb0), Z(0x99), Z(0x46), Z(0x3d), Z(0xf5), Z(0xd1), Z(0x39), |
106 | Z(0x72), Z(0x12), Z(0xf6), Z(0xba), Z(0x0c), Z(0x0d), Z(0x42), Z(0x2e) |
107 | }; |
108 | |
109 | #undef Z |
110 | #define Z(x) cpu_to_be32(((x & 0x1f) << 27) | (x >> 5)) |
111 | static const __be32 sbox1[256] = { |
112 | Z(0x77), Z(0x14), Z(0xa6), Z(0xfe), Z(0xb2), Z(0x5e), Z(0x8c), Z(0x3e), |
113 | Z(0x67), Z(0x6c), Z(0xa1), Z(0x0d), Z(0xc2), Z(0xa2), Z(0xc1), Z(0x85), |
114 | Z(0x6c), Z(0x7b), Z(0x67), Z(0xc6), Z(0x23), Z(0xe3), Z(0xf2), Z(0x89), |
115 | Z(0x50), Z(0x9c), Z(0x03), Z(0xb7), Z(0x73), Z(0xe6), Z(0xe1), Z(0x39), |
116 | Z(0x31), Z(0x2c), Z(0x27), Z(0x9f), Z(0xa5), Z(0x69), Z(0x44), Z(0xd6), |
117 | Z(0x23), Z(0x83), Z(0x98), Z(0x7d), Z(0x3c), Z(0xb4), Z(0x2d), Z(0x99), |
118 | Z(0x1c), Z(0x1f), Z(0x8c), Z(0x20), Z(0x03), Z(0x7c), Z(0x5f), Z(0xad), |
119 | Z(0xf4), Z(0xfa), Z(0x95), Z(0xca), Z(0x76), Z(0x44), Z(0xcd), Z(0xb6), |
120 | Z(0xb8), Z(0xa1), Z(0xa1), Z(0xbe), Z(0x9e), Z(0x54), Z(0x8f), Z(0x0b), |
121 | Z(0x16), Z(0x74), Z(0x31), Z(0x8a), Z(0x23), Z(0x17), Z(0x04), Z(0xfa), |
122 | Z(0x79), Z(0x84), Z(0xb1), Z(0xf5), Z(0x13), Z(0xab), Z(0xb5), Z(0x2e), |
123 | Z(0xaa), Z(0x0c), Z(0x60), Z(0x6b), Z(0x5b), Z(0xc4), Z(0x4b), Z(0xbc), |
124 | Z(0xe2), Z(0xaf), Z(0x45), Z(0x73), Z(0xfa), Z(0xc9), Z(0x49), Z(0xcd), |
125 | Z(0x00), Z(0x92), Z(0x7d), Z(0x97), Z(0x7a), Z(0x18), Z(0x60), Z(0x3d), |
126 | Z(0xcf), Z(0x5b), Z(0xde), Z(0xc6), Z(0xe2), Z(0xe6), Z(0xbb), Z(0x8b), |
127 | Z(0x06), Z(0xda), Z(0x08), Z(0x15), Z(0x1b), Z(0x88), Z(0x6a), Z(0x17), |
128 | Z(0x89), Z(0xd0), Z(0xa9), Z(0xc1), Z(0xc9), Z(0x70), Z(0x6b), Z(0xe5), |
129 | Z(0x43), Z(0xf4), Z(0x68), Z(0xc8), Z(0xd3), Z(0x84), Z(0x28), Z(0x0a), |
130 | Z(0x52), Z(0x66), Z(0xa3), Z(0xca), Z(0xf2), Z(0xe3), Z(0x7f), Z(0x7a), |
131 | Z(0x31), Z(0xf7), Z(0x88), Z(0x94), Z(0x5e), Z(0x9c), Z(0x63), Z(0xd5), |
132 | Z(0x24), Z(0x66), Z(0xfc), Z(0xb3), Z(0x57), Z(0x25), Z(0xbe), Z(0x89), |
133 | Z(0x44), Z(0xc4), Z(0xe0), Z(0x8f), Z(0x23), Z(0x3c), Z(0x12), Z(0x52), |
134 | Z(0xf5), Z(0x1e), Z(0xf4), Z(0xcb), Z(0x18), Z(0x33), Z(0x1f), Z(0xf8), |
135 | Z(0x69), Z(0x10), Z(0x9d), Z(0xd3), Z(0xf7), Z(0x28), Z(0xf8), Z(0x30), |
136 | Z(0x05), Z(0x5e), Z(0x32), Z(0xc0), Z(0xd5), Z(0x19), Z(0xbd), Z(0x45), |
137 | Z(0x8b), Z(0x5b), Z(0xfd), Z(0xbc), Z(0xe2), Z(0x5c), Z(0xa9), Z(0x96), |
138 | Z(0xef), Z(0x70), Z(0xcf), Z(0xc2), Z(0x2a), Z(0xb3), Z(0x61), Z(0xad), |
139 | Z(0x80), Z(0x48), Z(0x81), Z(0xb7), Z(0x1d), Z(0x43), Z(0xd9), Z(0xd7), |
140 | Z(0x45), Z(0xf0), Z(0xd8), Z(0x8a), Z(0x59), Z(0x7c), Z(0x57), Z(0xc1), |
141 | Z(0x79), Z(0xc7), Z(0x34), Z(0xd6), Z(0x43), Z(0xdf), Z(0xe4), Z(0x78), |
142 | Z(0x16), Z(0x06), Z(0xda), Z(0x92), Z(0x76), Z(0x51), Z(0xe1), Z(0xd4), |
143 | Z(0x70), Z(0x03), Z(0xe0), Z(0x2f), Z(0x96), Z(0x91), Z(0x82), Z(0x80) |
144 | }; |
145 | |
146 | #undef Z |
147 | #define Z(x) cpu_to_be32(x << 11) |
148 | static const __be32 sbox2[256] = { |
149 | Z(0xf0), Z(0x37), Z(0x24), Z(0x53), Z(0x2a), Z(0x03), Z(0x83), Z(0x86), |
150 | Z(0xd1), Z(0xec), Z(0x50), Z(0xf0), Z(0x42), Z(0x78), Z(0x2f), Z(0x6d), |
151 | Z(0xbf), Z(0x80), Z(0x87), Z(0x27), Z(0x95), Z(0xe2), Z(0xc5), Z(0x5d), |
152 | Z(0xf9), Z(0x6f), Z(0xdb), Z(0xb4), Z(0x65), Z(0x6e), Z(0xe7), Z(0x24), |
153 | Z(0xc8), Z(0x1a), Z(0xbb), Z(0x49), Z(0xb5), Z(0x0a), Z(0x7d), Z(0xb9), |
154 | Z(0xe8), Z(0xdc), Z(0xb7), Z(0xd9), Z(0x45), Z(0x20), Z(0x1b), Z(0xce), |
155 | Z(0x59), Z(0x9d), Z(0x6b), Z(0xbd), Z(0x0e), Z(0x8f), Z(0xa3), Z(0xa9), |
156 | Z(0xbc), Z(0x74), Z(0xa6), Z(0xf6), Z(0x7f), Z(0x5f), Z(0xb1), Z(0x68), |
157 | Z(0x84), Z(0xbc), Z(0xa9), Z(0xfd), Z(0x55), Z(0x50), Z(0xe9), Z(0xb6), |
158 | Z(0x13), Z(0x5e), Z(0x07), Z(0xb8), Z(0x95), Z(0x02), Z(0xc0), Z(0xd0), |
159 | Z(0x6a), Z(0x1a), Z(0x85), Z(0xbd), Z(0xb6), Z(0xfd), Z(0xfe), Z(0x17), |
160 | Z(0x3f), Z(0x09), Z(0xa3), Z(0x8d), Z(0xfb), Z(0xed), Z(0xda), Z(0x1d), |
161 | Z(0x6d), Z(0x1c), Z(0x6c), Z(0x01), Z(0x5a), Z(0xe5), Z(0x71), Z(0x3e), |
162 | Z(0x8b), Z(0x6b), Z(0xbe), Z(0x29), Z(0xeb), Z(0x12), Z(0x19), Z(0x34), |
163 | Z(0xcd), Z(0xb3), Z(0xbd), Z(0x35), Z(0xea), Z(0x4b), Z(0xd5), Z(0xae), |
164 | Z(0x2a), Z(0x79), Z(0x5a), Z(0xa5), Z(0x32), Z(0x12), Z(0x7b), Z(0xdc), |
165 | Z(0x2c), Z(0xd0), Z(0x22), Z(0x4b), Z(0xb1), Z(0x85), Z(0x59), Z(0x80), |
166 | Z(0xc0), Z(0x30), Z(0x9f), Z(0x73), Z(0xd3), Z(0x14), Z(0x48), Z(0x40), |
167 | Z(0x07), Z(0x2d), Z(0x8f), Z(0x80), Z(0x0f), Z(0xce), Z(0x0b), Z(0x5e), |
168 | Z(0xb7), Z(0x5e), Z(0xac), Z(0x24), Z(0x94), Z(0x4a), Z(0x18), Z(0x15), |
169 | Z(0x05), Z(0xe8), Z(0x02), Z(0x77), Z(0xa9), Z(0xc7), Z(0x40), Z(0x45), |
170 | Z(0x89), Z(0xd1), Z(0xea), Z(0xde), Z(0x0c), Z(0x79), Z(0x2a), Z(0x99), |
171 | Z(0x6c), Z(0x3e), Z(0x95), Z(0xdd), Z(0x8c), Z(0x7d), Z(0xad), Z(0x6f), |
172 | Z(0xdc), Z(0xff), Z(0xfd), Z(0x62), Z(0x47), Z(0xb3), Z(0x21), Z(0x8a), |
173 | Z(0xec), Z(0x8e), Z(0x19), Z(0x18), Z(0xb4), Z(0x6e), Z(0x3d), Z(0xfd), |
174 | Z(0x74), Z(0x54), Z(0x1e), Z(0x04), Z(0x85), Z(0xd8), Z(0xbc), Z(0x1f), |
175 | Z(0x56), Z(0xe7), Z(0x3a), Z(0x56), Z(0x67), Z(0xd6), Z(0xc8), Z(0xa5), |
176 | Z(0xf3), Z(0x8e), Z(0xde), Z(0xae), Z(0x37), Z(0x49), Z(0xb7), Z(0xfa), |
177 | Z(0xc8), Z(0xf4), Z(0x1f), Z(0xe0), Z(0x2a), Z(0x9b), Z(0x15), Z(0xd1), |
178 | Z(0x34), Z(0x0e), Z(0xb5), Z(0xe0), Z(0x44), Z(0x78), Z(0x84), Z(0x59), |
179 | Z(0x56), Z(0x68), Z(0x77), Z(0xa5), Z(0x14), Z(0x06), Z(0xf5), Z(0x2f), |
180 | Z(0x8c), Z(0x8a), Z(0x73), Z(0x80), Z(0x76), Z(0xb4), Z(0x10), Z(0x86) |
181 | }; |
182 | |
183 | #undef Z |
184 | #define Z(x) cpu_to_be32(x << 19) |
185 | static const __be32 sbox3[256] = { |
186 | Z(0xa9), Z(0x2a), Z(0x48), Z(0x51), Z(0x84), Z(0x7e), Z(0x49), Z(0xe2), |
187 | Z(0xb5), Z(0xb7), Z(0x42), Z(0x33), Z(0x7d), Z(0x5d), Z(0xa6), Z(0x12), |
188 | Z(0x44), Z(0x48), Z(0x6d), Z(0x28), Z(0xaa), Z(0x20), Z(0x6d), Z(0x57), |
189 | Z(0xd6), Z(0x6b), Z(0x5d), Z(0x72), Z(0xf0), Z(0x92), Z(0x5a), Z(0x1b), |
190 | Z(0x53), Z(0x80), Z(0x24), Z(0x70), Z(0x9a), Z(0xcc), Z(0xa7), Z(0x66), |
191 | Z(0xa1), Z(0x01), Z(0xa5), Z(0x41), Z(0x97), Z(0x41), Z(0x31), Z(0x82), |
192 | Z(0xf1), Z(0x14), Z(0xcf), Z(0x53), Z(0x0d), Z(0xa0), Z(0x10), Z(0xcc), |
193 | Z(0x2a), Z(0x7d), Z(0xd2), Z(0xbf), Z(0x4b), Z(0x1a), Z(0xdb), Z(0x16), |
194 | Z(0x47), Z(0xf6), Z(0x51), Z(0x36), Z(0xed), Z(0xf3), Z(0xb9), Z(0x1a), |
195 | Z(0xa7), Z(0xdf), Z(0x29), Z(0x43), Z(0x01), Z(0x54), Z(0x70), Z(0xa4), |
196 | Z(0xbf), Z(0xd4), Z(0x0b), Z(0x53), Z(0x44), Z(0x60), Z(0x9e), Z(0x23), |
197 | Z(0xa1), Z(0x18), Z(0x68), Z(0x4f), Z(0xf0), Z(0x2f), Z(0x82), Z(0xc2), |
198 | Z(0x2a), Z(0x41), Z(0xb2), Z(0x42), Z(0x0c), Z(0xed), Z(0x0c), Z(0x1d), |
199 | Z(0x13), Z(0x3a), Z(0x3c), Z(0x6e), Z(0x35), Z(0xdc), Z(0x60), Z(0x65), |
200 | Z(0x85), Z(0xe9), Z(0x64), Z(0x02), Z(0x9a), Z(0x3f), Z(0x9f), Z(0x87), |
201 | Z(0x96), Z(0xdf), Z(0xbe), Z(0xf2), Z(0xcb), Z(0xe5), Z(0x6c), Z(0xd4), |
202 | Z(0x5a), Z(0x83), Z(0xbf), Z(0x92), Z(0x1b), Z(0x94), Z(0x00), Z(0x42), |
203 | Z(0xcf), Z(0x4b), Z(0x00), Z(0x75), Z(0xba), Z(0x8f), Z(0x76), Z(0x5f), |
204 | Z(0x5d), Z(0x3a), Z(0x4d), Z(0x09), Z(0x12), Z(0x08), Z(0x38), Z(0x95), |
205 | Z(0x17), Z(0xe4), Z(0x01), Z(0x1d), Z(0x4c), Z(0xa9), Z(0xcc), Z(0x85), |
206 | Z(0x82), Z(0x4c), Z(0x9d), Z(0x2f), Z(0x3b), Z(0x66), Z(0xa1), Z(0x34), |
207 | Z(0x10), Z(0xcd), Z(0x59), Z(0x89), Z(0xa5), Z(0x31), Z(0xcf), Z(0x05), |
208 | Z(0xc8), Z(0x84), Z(0xfa), Z(0xc7), Z(0xba), Z(0x4e), Z(0x8b), Z(0x1a), |
209 | Z(0x19), Z(0xf1), Z(0xa1), Z(0x3b), Z(0x18), Z(0x12), Z(0x17), Z(0xb0), |
210 | Z(0x98), Z(0x8d), Z(0x0b), Z(0x23), Z(0xc3), Z(0x3a), Z(0x2d), Z(0x20), |
211 | Z(0xdf), Z(0x13), Z(0xa0), Z(0xa8), Z(0x4c), Z(0x0d), Z(0x6c), Z(0x2f), |
212 | Z(0x47), Z(0x13), Z(0x13), Z(0x52), Z(0x1f), Z(0x2d), Z(0xf5), Z(0x79), |
213 | Z(0x3d), Z(0xa2), Z(0x54), Z(0xbd), Z(0x69), Z(0xc8), Z(0x6b), Z(0xf3), |
214 | Z(0x05), Z(0x28), Z(0xf1), Z(0x16), Z(0x46), Z(0x40), Z(0xb0), Z(0x11), |
215 | Z(0xd3), Z(0xb7), Z(0x95), Z(0x49), Z(0xcf), Z(0xc3), Z(0x1d), Z(0x8f), |
216 | Z(0xd8), Z(0xe1), Z(0x73), Z(0xdb), Z(0xad), Z(0xc8), Z(0xc9), Z(0xa9), |
217 | Z(0xa1), Z(0xc2), Z(0xc5), Z(0xe3), Z(0xba), Z(0xfc), Z(0x0e), Z(0x25) |
218 | }; |
219 | |
220 | /* |
221 | * This is a 16 round Feistel network with permutation F_ENCRYPT |
222 | */ |
223 | #define F_ENCRYPT(R, L, sched) \ |
224 | do { \ |
225 | union lc4 { __be32 l; u8 c[4]; } u; \ |
226 | u.l = sched ^ R; \ |
227 | L ^= sbox0[u.c[0]] ^ sbox1[u.c[1]] ^ sbox2[u.c[2]] ^ sbox3[u.c[3]]; \ |
228 | } while (0) |
229 | |
230 | /* |
231 | * encryptor |
232 | */ |
233 | static void fcrypt_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
234 | { |
235 | const struct fcrypt_ctx *ctx = crypto_tfm_ctx(tfm); |
236 | struct { |
237 | __be32 l, r; |
238 | } X; |
239 | |
240 | memcpy(&X, src, sizeof(X)); |
241 | |
242 | F_ENCRYPT(X.r, X.l, ctx->sched[0x0]); |
243 | F_ENCRYPT(X.l, X.r, ctx->sched[0x1]); |
244 | F_ENCRYPT(X.r, X.l, ctx->sched[0x2]); |
245 | F_ENCRYPT(X.l, X.r, ctx->sched[0x3]); |
246 | F_ENCRYPT(X.r, X.l, ctx->sched[0x4]); |
247 | F_ENCRYPT(X.l, X.r, ctx->sched[0x5]); |
248 | F_ENCRYPT(X.r, X.l, ctx->sched[0x6]); |
249 | F_ENCRYPT(X.l, X.r, ctx->sched[0x7]); |
250 | F_ENCRYPT(X.r, X.l, ctx->sched[0x8]); |
251 | F_ENCRYPT(X.l, X.r, ctx->sched[0x9]); |
252 | F_ENCRYPT(X.r, X.l, ctx->sched[0xa]); |
253 | F_ENCRYPT(X.l, X.r, ctx->sched[0xb]); |
254 | F_ENCRYPT(X.r, X.l, ctx->sched[0xc]); |
255 | F_ENCRYPT(X.l, X.r, ctx->sched[0xd]); |
256 | F_ENCRYPT(X.r, X.l, ctx->sched[0xe]); |
257 | F_ENCRYPT(X.l, X.r, ctx->sched[0xf]); |
258 | |
259 | memcpy(dst, &X, sizeof(X)); |
260 | } |
261 | |
262 | /* |
263 | * decryptor |
264 | */ |
265 | static void fcrypt_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) |
266 | { |
267 | const struct fcrypt_ctx *ctx = crypto_tfm_ctx(tfm); |
268 | struct { |
269 | __be32 l, r; |
270 | } X; |
271 | |
272 | memcpy(&X, src, sizeof(X)); |
273 | |
274 | F_ENCRYPT(X.l, X.r, ctx->sched[0xf]); |
275 | F_ENCRYPT(X.r, X.l, ctx->sched[0xe]); |
276 | F_ENCRYPT(X.l, X.r, ctx->sched[0xd]); |
277 | F_ENCRYPT(X.r, X.l, ctx->sched[0xc]); |
278 | F_ENCRYPT(X.l, X.r, ctx->sched[0xb]); |
279 | F_ENCRYPT(X.r, X.l, ctx->sched[0xa]); |
280 | F_ENCRYPT(X.l, X.r, ctx->sched[0x9]); |
281 | F_ENCRYPT(X.r, X.l, ctx->sched[0x8]); |
282 | F_ENCRYPT(X.l, X.r, ctx->sched[0x7]); |
283 | F_ENCRYPT(X.r, X.l, ctx->sched[0x6]); |
284 | F_ENCRYPT(X.l, X.r, ctx->sched[0x5]); |
285 | F_ENCRYPT(X.r, X.l, ctx->sched[0x4]); |
286 | F_ENCRYPT(X.l, X.r, ctx->sched[0x3]); |
287 | F_ENCRYPT(X.r, X.l, ctx->sched[0x2]); |
288 | F_ENCRYPT(X.l, X.r, ctx->sched[0x1]); |
289 | F_ENCRYPT(X.r, X.l, ctx->sched[0x0]); |
290 | |
291 | memcpy(dst, &X, sizeof(X)); |
292 | } |
293 | |
294 | /* |
295 | * Generate a key schedule from key, the least significant bit in each key byte |
296 | * is parity and shall be ignored. This leaves 56 significant bits in the key |
297 | * to scatter over the 16 key schedules. For each schedule extract the low |
298 | * order 32 bits and use as schedule, then rotate right by 11 bits. |
299 | */ |
300 | static int fcrypt_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) |
301 | { |
302 | struct fcrypt_ctx *ctx = crypto_tfm_ctx(tfm); |
303 | |
304 | #if BITS_PER_LONG == 64 /* the 64-bit version can also be used for 32-bit |
305 | * kernels - it seems to be faster but the code is |
306 | * larger */ |
307 | |
308 | u64 k; /* k holds all 56 non-parity bits */ |
309 | |
310 | /* discard the parity bits */ |
311 | k = (*key++) >> 1; |
312 | k <<= 7; |
313 | k |= (*key++) >> 1; |
314 | k <<= 7; |
315 | k |= (*key++) >> 1; |
316 | k <<= 7; |
317 | k |= (*key++) >> 1; |
318 | k <<= 7; |
319 | k |= (*key++) >> 1; |
320 | k <<= 7; |
321 | k |= (*key++) >> 1; |
322 | k <<= 7; |
323 | k |= (*key++) >> 1; |
324 | k <<= 7; |
325 | k |= (*key) >> 1; |
326 | |
327 | /* Use lower 32 bits for schedule, rotate by 11 each round (16 times) */ |
328 | ctx->sched[0x0] = cpu_to_be32(k); ror56_64(k, 11); |
329 | ctx->sched[0x1] = cpu_to_be32(k); ror56_64(k, 11); |
330 | ctx->sched[0x2] = cpu_to_be32(k); ror56_64(k, 11); |
331 | ctx->sched[0x3] = cpu_to_be32(k); ror56_64(k, 11); |
332 | ctx->sched[0x4] = cpu_to_be32(k); ror56_64(k, 11); |
333 | ctx->sched[0x5] = cpu_to_be32(k); ror56_64(k, 11); |
334 | ctx->sched[0x6] = cpu_to_be32(k); ror56_64(k, 11); |
335 | ctx->sched[0x7] = cpu_to_be32(k); ror56_64(k, 11); |
336 | ctx->sched[0x8] = cpu_to_be32(k); ror56_64(k, 11); |
337 | ctx->sched[0x9] = cpu_to_be32(k); ror56_64(k, 11); |
338 | ctx->sched[0xa] = cpu_to_be32(k); ror56_64(k, 11); |
339 | ctx->sched[0xb] = cpu_to_be32(k); ror56_64(k, 11); |
340 | ctx->sched[0xc] = cpu_to_be32(k); ror56_64(k, 11); |
341 | ctx->sched[0xd] = cpu_to_be32(k); ror56_64(k, 11); |
342 | ctx->sched[0xe] = cpu_to_be32(k); ror56_64(k, 11); |
343 | ctx->sched[0xf] = cpu_to_be32(k); |
344 | |
345 | return 0; |
346 | #else |
347 | u32 hi, lo; /* hi is upper 24 bits and lo lower 32, total 56 */ |
348 | |
349 | /* discard the parity bits */ |
350 | lo = (*key++) >> 1; |
351 | lo <<= 7; |
352 | lo |= (*key++) >> 1; |
353 | lo <<= 7; |
354 | lo |= (*key++) >> 1; |
355 | lo <<= 7; |
356 | lo |= (*key++) >> 1; |
357 | hi = lo >> 4; |
358 | lo &= 0xf; |
359 | lo <<= 7; |
360 | lo |= (*key++) >> 1; |
361 | lo <<= 7; |
362 | lo |= (*key++) >> 1; |
363 | lo <<= 7; |
364 | lo |= (*key++) >> 1; |
365 | lo <<= 7; |
366 | lo |= (*key) >> 1; |
367 | |
368 | /* Use lower 32 bits for schedule, rotate by 11 each round (16 times) */ |
369 | ctx->sched[0x0] = cpu_to_be32(lo); ror56(hi, lo, 11); |
370 | ctx->sched[0x1] = cpu_to_be32(lo); ror56(hi, lo, 11); |
371 | ctx->sched[0x2] = cpu_to_be32(lo); ror56(hi, lo, 11); |
372 | ctx->sched[0x3] = cpu_to_be32(lo); ror56(hi, lo, 11); |
373 | ctx->sched[0x4] = cpu_to_be32(lo); ror56(hi, lo, 11); |
374 | ctx->sched[0x5] = cpu_to_be32(lo); ror56(hi, lo, 11); |
375 | ctx->sched[0x6] = cpu_to_be32(lo); ror56(hi, lo, 11); |
376 | ctx->sched[0x7] = cpu_to_be32(lo); ror56(hi, lo, 11); |
377 | ctx->sched[0x8] = cpu_to_be32(lo); ror56(hi, lo, 11); |
378 | ctx->sched[0x9] = cpu_to_be32(lo); ror56(hi, lo, 11); |
379 | ctx->sched[0xa] = cpu_to_be32(lo); ror56(hi, lo, 11); |
380 | ctx->sched[0xb] = cpu_to_be32(lo); ror56(hi, lo, 11); |
381 | ctx->sched[0xc] = cpu_to_be32(lo); ror56(hi, lo, 11); |
382 | ctx->sched[0xd] = cpu_to_be32(lo); ror56(hi, lo, 11); |
383 | ctx->sched[0xe] = cpu_to_be32(lo); ror56(hi, lo, 11); |
384 | ctx->sched[0xf] = cpu_to_be32(lo); |
385 | return 0; |
386 | #endif |
387 | } |
388 | |
389 | static struct crypto_alg fcrypt_alg = { |
390 | .cra_name = "fcrypt" , |
391 | .cra_driver_name = "fcrypt-generic" , |
392 | .cra_flags = CRYPTO_ALG_TYPE_CIPHER, |
393 | .cra_blocksize = 8, |
394 | .cra_ctxsize = sizeof(struct fcrypt_ctx), |
395 | .cra_module = THIS_MODULE, |
396 | .cra_u = { .cipher = { |
397 | .cia_min_keysize = 8, |
398 | .cia_max_keysize = 8, |
399 | .cia_setkey = fcrypt_setkey, |
400 | .cia_encrypt = fcrypt_encrypt, |
401 | .cia_decrypt = fcrypt_decrypt } } |
402 | }; |
403 | |
404 | static int __init fcrypt_mod_init(void) |
405 | { |
406 | return crypto_register_alg(alg: &fcrypt_alg); |
407 | } |
408 | |
409 | static void __exit fcrypt_mod_fini(void) |
410 | { |
411 | crypto_unregister_alg(alg: &fcrypt_alg); |
412 | } |
413 | |
414 | subsys_initcall(fcrypt_mod_init); |
415 | module_exit(fcrypt_mod_fini); |
416 | |
417 | MODULE_LICENSE("Dual BSD/GPL" ); |
418 | MODULE_DESCRIPTION("FCrypt Cipher Algorithm" ); |
419 | MODULE_AUTHOR("David Howells <dhowells@redhat.com>" ); |
420 | MODULE_ALIAS_CRYPTO("fcrypt" ); |
421 | |