1/*
2 * Cryptographic API.
3 *
4 * Serpent Cipher Algorithm.
5 *
6 * Copyright (C) 2002 Dag Arne Osvik <osvik@ii.uib.no>
7 * 2003 Herbert Valerio Riedel <hvr@gnu.org>
8 *
9 * Added tnepres support:
10 * Ruben Jesus Garcia Hernandez <ruben@ugr.es>, 18.10.2004
11 * Based on code by hvr
12 *
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
17 */
18
19#include <linux/init.h>
20#include <linux/module.h>
21#include <linux/errno.h>
22#include <asm/byteorder.h>
23#include <linux/crypto.h>
24#include <linux/types.h>
25#include <crypto/serpent.h>
26
27/* Key is padded to the maximum of 256 bits before round key generation.
28 * Any key length <= 256 bits (32 bytes) is allowed by the algorithm.
29 */
30
31#define PHI 0x9e3779b9UL
32
33#define keyiter(a, b, c, d, i, j) \
34 ({ b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; b = rol32(b, 11); k[j] = b; })
35
36#define loadkeys(x0, x1, x2, x3, i) \
37 ({ x0 = k[i]; x1 = k[i+1]; x2 = k[i+2]; x3 = k[i+3]; })
38
39#define storekeys(x0, x1, x2, x3, i) \
40 ({ k[i] = x0; k[i+1] = x1; k[i+2] = x2; k[i+3] = x3; })
41
42#define store_and_load_keys(x0, x1, x2, x3, s, l) \
43 ({ storekeys(x0, x1, x2, x3, s); loadkeys(x0, x1, x2, x3, l); })
44
45#define K(x0, x1, x2, x3, i) ({ \
46 x3 ^= k[4*(i)+3]; x2 ^= k[4*(i)+2]; \
47 x1 ^= k[4*(i)+1]; x0 ^= k[4*(i)+0]; \
48 })
49
50#define LK(x0, x1, x2, x3, x4, i) ({ \
51 x0 = rol32(x0, 13);\
52 x2 = rol32(x2, 3); x1 ^= x0; x4 = x0 << 3; \
53 x3 ^= x2; x1 ^= x2; \
54 x1 = rol32(x1, 1); x3 ^= x4; \
55 x3 = rol32(x3, 7); x4 = x1; \
56 x0 ^= x1; x4 <<= 7; x2 ^= x3; \
57 x0 ^= x3; x2 ^= x4; x3 ^= k[4*i+3]; \
58 x1 ^= k[4*i+1]; x0 = rol32(x0, 5); x2 = rol32(x2, 22);\
59 x0 ^= k[4*i+0]; x2 ^= k[4*i+2]; \
60 })
61
62#define KL(x0, x1, x2, x3, x4, i) ({ \
63 x0 ^= k[4*i+0]; x1 ^= k[4*i+1]; x2 ^= k[4*i+2]; \
64 x3 ^= k[4*i+3]; x0 = ror32(x0, 5); x2 = ror32(x2, 22);\
65 x4 = x1; x2 ^= x3; x0 ^= x3; \
66 x4 <<= 7; x0 ^= x1; x1 = ror32(x1, 1); \
67 x2 ^= x4; x3 = ror32(x3, 7); x4 = x0 << 3; \
68 x1 ^= x0; x3 ^= x4; x0 = ror32(x0, 13);\
69 x1 ^= x2; x3 ^= x2; x2 = ror32(x2, 3); \
70 })
71
72#define S0(x0, x1, x2, x3, x4) ({ \
73 x4 = x3; \
74 x3 |= x0; x0 ^= x4; x4 ^= x2; \
75 x4 = ~x4; x3 ^= x1; x1 &= x0; \
76 x1 ^= x4; x2 ^= x0; x0 ^= x3; \
77 x4 |= x0; x0 ^= x2; x2 &= x1; \
78 x3 ^= x2; x1 = ~x1; x2 ^= x4; \
79 x1 ^= x2; \
80 })
81
82#define S1(x0, x1, x2, x3, x4) ({ \
83 x4 = x1; \
84 x1 ^= x0; x0 ^= x3; x3 = ~x3; \
85 x4 &= x1; x0 |= x1; x3 ^= x2; \
86 x0 ^= x3; x1 ^= x3; x3 ^= x4; \
87 x1 |= x4; x4 ^= x2; x2 &= x0; \
88 x2 ^= x1; x1 |= x0; x0 = ~x0; \
89 x0 ^= x2; x4 ^= x1; \
90 })
91
92#define S2(x0, x1, x2, x3, x4) ({ \
93 x3 = ~x3; \
94 x1 ^= x0; x4 = x0; x0 &= x2; \
95 x0 ^= x3; x3 |= x4; x2 ^= x1; \
96 x3 ^= x1; x1 &= x0; x0 ^= x2; \
97 x2 &= x3; x3 |= x1; x0 = ~x0; \
98 x3 ^= x0; x4 ^= x0; x0 ^= x2; \
99 x1 |= x2; \
100 })
101
102#define S3(x0, x1, x2, x3, x4) ({ \
103 x4 = x1; \
104 x1 ^= x3; x3 |= x0; x4 &= x0; \
105 x0 ^= x2; x2 ^= x1; x1 &= x3; \
106 x2 ^= x3; x0 |= x4; x4 ^= x3; \
107 x1 ^= x0; x0 &= x3; x3 &= x4; \
108 x3 ^= x2; x4 |= x1; x2 &= x1; \
109 x4 ^= x3; x0 ^= x3; x3 ^= x2; \
110 })
111
112#define S4(x0, x1, x2, x3, x4) ({ \
113 x4 = x3; \
114 x3 &= x0; x0 ^= x4; \
115 x3 ^= x2; x2 |= x4; x0 ^= x1; \
116 x4 ^= x3; x2 |= x0; \
117 x2 ^= x1; x1 &= x0; \
118 x1 ^= x4; x4 &= x2; x2 ^= x3; \
119 x4 ^= x0; x3 |= x1; x1 = ~x1; \
120 x3 ^= x0; \
121 })
122
123#define S5(x0, x1, x2, x3, x4) ({ \
124 x4 = x1; x1 |= x0; \
125 x2 ^= x1; x3 = ~x3; x4 ^= x0; \
126 x0 ^= x2; x1 &= x4; x4 |= x3; \
127 x4 ^= x0; x0 &= x3; x1 ^= x3; \
128 x3 ^= x2; x0 ^= x1; x2 &= x4; \
129 x1 ^= x2; x2 &= x0; \
130 x3 ^= x2; \
131 })
132
133#define S6(x0, x1, x2, x3, x4) ({ \
134 x4 = x1; \
135 x3 ^= x0; x1 ^= x2; x2 ^= x0; \
136 x0 &= x3; x1 |= x3; x4 = ~x4; \
137 x0 ^= x1; x1 ^= x2; \
138 x3 ^= x4; x4 ^= x0; x2 &= x0; \
139 x4 ^= x1; x2 ^= x3; x3 &= x1; \
140 x3 ^= x0; x1 ^= x2; \
141 })
142
143#define S7(x0, x1, x2, x3, x4) ({ \
144 x1 = ~x1; \
145 x4 = x1; x0 = ~x0; x1 &= x2; \
146 x1 ^= x3; x3 |= x4; x4 ^= x2; \
147 x2 ^= x3; x3 ^= x0; x0 |= x1; \
148 x2 &= x0; x0 ^= x4; x4 ^= x3; \
149 x3 &= x0; x4 ^= x1; \
150 x2 ^= x4; x3 ^= x1; x4 |= x0; \
151 x4 ^= x1; \
152 })
153
154#define SI0(x0, x1, x2, x3, x4) ({ \
155 x4 = x3; x1 ^= x0; \
156 x3 |= x1; x4 ^= x1; x0 = ~x0; \
157 x2 ^= x3; x3 ^= x0; x0 &= x1; \
158 x0 ^= x2; x2 &= x3; x3 ^= x4; \
159 x2 ^= x3; x1 ^= x3; x3 &= x0; \
160 x1 ^= x0; x0 ^= x2; x4 ^= x3; \
161 })
162
163#define SI1(x0, x1, x2, x3, x4) ({ \
164 x1 ^= x3; x4 = x0; \
165 x0 ^= x2; x2 = ~x2; x4 |= x1; \
166 x4 ^= x3; x3 &= x1; x1 ^= x2; \
167 x2 &= x4; x4 ^= x1; x1 |= x3; \
168 x3 ^= x0; x2 ^= x0; x0 |= x4; \
169 x2 ^= x4; x1 ^= x0; \
170 x4 ^= x1; \
171 })
172
173#define SI2(x0, x1, x2, x3, x4) ({ \
174 x2 ^= x1; x4 = x3; x3 = ~x3; \
175 x3 |= x2; x2 ^= x4; x4 ^= x0; \
176 x3 ^= x1; x1 |= x2; x2 ^= x0; \
177 x1 ^= x4; x4 |= x3; x2 ^= x3; \
178 x4 ^= x2; x2 &= x1; \
179 x2 ^= x3; x3 ^= x4; x4 ^= x0; \
180 })
181
182#define SI3(x0, x1, x2, x3, x4) ({ \
183 x2 ^= x1; \
184 x4 = x1; x1 &= x2; \
185 x1 ^= x0; x0 |= x4; x4 ^= x3; \
186 x0 ^= x3; x3 |= x1; x1 ^= x2; \
187 x1 ^= x3; x0 ^= x2; x2 ^= x3; \
188 x3 &= x1; x1 ^= x0; x0 &= x2; \
189 x4 ^= x3; x3 ^= x0; x0 ^= x1; \
190 })
191
192#define SI4(x0, x1, x2, x3, x4) ({ \
193 x2 ^= x3; x4 = x0; x0 &= x1; \
194 x0 ^= x2; x2 |= x3; x4 = ~x4; \
195 x1 ^= x0; x0 ^= x2; x2 &= x4; \
196 x2 ^= x0; x0 |= x4; \
197 x0 ^= x3; x3 &= x2; \
198 x4 ^= x3; x3 ^= x1; x1 &= x0; \
199 x4 ^= x1; x0 ^= x3; \
200 })
201
202#define SI5(x0, x1, x2, x3, x4) ({ \
203 x4 = x1; x1 |= x2; \
204 x2 ^= x4; x1 ^= x3; x3 &= x4; \
205 x2 ^= x3; x3 |= x0; x0 = ~x0; \
206 x3 ^= x2; x2 |= x0; x4 ^= x1; \
207 x2 ^= x4; x4 &= x0; x0 ^= x1; \
208 x1 ^= x3; x0 &= x2; x2 ^= x3; \
209 x0 ^= x2; x2 ^= x4; x4 ^= x3; \
210 })
211
212#define SI6(x0, x1, x2, x3, x4) ({ \
213 x0 ^= x2; \
214 x4 = x0; x0 &= x3; x2 ^= x3; \
215 x0 ^= x2; x3 ^= x1; x2 |= x4; \
216 x2 ^= x3; x3 &= x0; x0 = ~x0; \
217 x3 ^= x1; x1 &= x2; x4 ^= x0; \
218 x3 ^= x4; x4 ^= x2; x0 ^= x1; \
219 x2 ^= x0; \
220 })
221
222#define SI7(x0, x1, x2, x3, x4) ({ \
223 x4 = x3; x3 &= x0; x0 ^= x2; \
224 x2 |= x4; x4 ^= x1; x0 = ~x0; \
225 x1 |= x3; x4 ^= x0; x0 &= x2; \
226 x0 ^= x1; x1 &= x2; x3 ^= x2; \
227 x4 ^= x3; x2 &= x3; x3 |= x0; \
228 x1 ^= x4; x3 ^= x4; x4 &= x0; \
229 x4 ^= x2; \
230 })
231
232static void __serpent_setkey_sbox(u32 r0, u32 r1, u32 r2, u32 r3, u32 r4, u32 *k)
233{
234 k += 100;
235 S3(r3, r4, r0, r1, r2); store_and_load_keys(r1, r2, r4, r3, 28, 24);
236 S4(r1, r2, r4, r3, r0); store_and_load_keys(r2, r4, r3, r0, 24, 20);
237 S5(r2, r4, r3, r0, r1); store_and_load_keys(r1, r2, r4, r0, 20, 16);
238 S6(r1, r2, r4, r0, r3); store_and_load_keys(r4, r3, r2, r0, 16, 12);
239 S7(r4, r3, r2, r0, r1); store_and_load_keys(r1, r2, r0, r4, 12, 8);
240 S0(r1, r2, r0, r4, r3); store_and_load_keys(r0, r2, r4, r1, 8, 4);
241 S1(r0, r2, r4, r1, r3); store_and_load_keys(r3, r4, r1, r0, 4, 0);
242 S2(r3, r4, r1, r0, r2); store_and_load_keys(r2, r4, r3, r0, 0, -4);
243 S3(r2, r4, r3, r0, r1); store_and_load_keys(r0, r1, r4, r2, -4, -8);
244 S4(r0, r1, r4, r2, r3); store_and_load_keys(r1, r4, r2, r3, -8, -12);
245 S5(r1, r4, r2, r3, r0); store_and_load_keys(r0, r1, r4, r3, -12, -16);
246 S6(r0, r1, r4, r3, r2); store_and_load_keys(r4, r2, r1, r3, -16, -20);
247 S7(r4, r2, r1, r3, r0); store_and_load_keys(r0, r1, r3, r4, -20, -24);
248 S0(r0, r1, r3, r4, r2); store_and_load_keys(r3, r1, r4, r0, -24, -28);
249 k -= 50;
250 S1(r3, r1, r4, r0, r2); store_and_load_keys(r2, r4, r0, r3, 22, 18);
251 S2(r2, r4, r0, r3, r1); store_and_load_keys(r1, r4, r2, r3, 18, 14);
252 S3(r1, r4, r2, r3, r0); store_and_load_keys(r3, r0, r4, r1, 14, 10);
253 S4(r3, r0, r4, r1, r2); store_and_load_keys(r0, r4, r1, r2, 10, 6);
254 S5(r0, r4, r1, r2, r3); store_and_load_keys(r3, r0, r4, r2, 6, 2);
255 S6(r3, r0, r4, r2, r1); store_and_load_keys(r4, r1, r0, r2, 2, -2);
256 S7(r4, r1, r0, r2, r3); store_and_load_keys(r3, r0, r2, r4, -2, -6);
257 S0(r3, r0, r2, r4, r1); store_and_load_keys(r2, r0, r4, r3, -6, -10);
258 S1(r2, r0, r4, r3, r1); store_and_load_keys(r1, r4, r3, r2, -10, -14);
259 S2(r1, r4, r3, r2, r0); store_and_load_keys(r0, r4, r1, r2, -14, -18);
260 S3(r0, r4, r1, r2, r3); store_and_load_keys(r2, r3, r4, r0, -18, -22);
261 k -= 50;
262 S4(r2, r3, r4, r0, r1); store_and_load_keys(r3, r4, r0, r1, 28, 24);
263 S5(r3, r4, r0, r1, r2); store_and_load_keys(r2, r3, r4, r1, 24, 20);
264 S6(r2, r3, r4, r1, r0); store_and_load_keys(r4, r0, r3, r1, 20, 16);
265 S7(r4, r0, r3, r1, r2); store_and_load_keys(r2, r3, r1, r4, 16, 12);
266 S0(r2, r3, r1, r4, r0); store_and_load_keys(r1, r3, r4, r2, 12, 8);
267 S1(r1, r3, r4, r2, r0); store_and_load_keys(r0, r4, r2, r1, 8, 4);
268 S2(r0, r4, r2, r1, r3); store_and_load_keys(r3, r4, r0, r1, 4, 0);
269 S3(r3, r4, r0, r1, r2); storekeys(r1, r2, r4, r3, 0);
270}
271
272int __serpent_setkey(struct serpent_ctx *ctx, const u8 *key,
273 unsigned int keylen)
274{
275 u32 *k = ctx->expkey;
276 u8 *k8 = (u8 *)k;
277 u32 r0, r1, r2, r3, r4;
278 int i;
279
280 /* Copy key, add padding */
281
282 for (i = 0; i < keylen; ++i)
283 k8[i] = key[i];
284 if (i < SERPENT_MAX_KEY_SIZE)
285 k8[i++] = 1;
286 while (i < SERPENT_MAX_KEY_SIZE)
287 k8[i++] = 0;
288
289 /* Expand key using polynomial */
290
291 r0 = le32_to_cpu(k[3]);
292 r1 = le32_to_cpu(k[4]);
293 r2 = le32_to_cpu(k[5]);
294 r3 = le32_to_cpu(k[6]);
295 r4 = le32_to_cpu(k[7]);
296
297 keyiter(le32_to_cpu(k[0]), r0, r4, r2, 0, 0);
298 keyiter(le32_to_cpu(k[1]), r1, r0, r3, 1, 1);
299 keyiter(le32_to_cpu(k[2]), r2, r1, r4, 2, 2);
300 keyiter(le32_to_cpu(k[3]), r3, r2, r0, 3, 3);
301 keyiter(le32_to_cpu(k[4]), r4, r3, r1, 4, 4);
302 keyiter(le32_to_cpu(k[5]), r0, r4, r2, 5, 5);
303 keyiter(le32_to_cpu(k[6]), r1, r0, r3, 6, 6);
304 keyiter(le32_to_cpu(k[7]), r2, r1, r4, 7, 7);
305
306 keyiter(k[0], r3, r2, r0, 8, 8);
307 keyiter(k[1], r4, r3, r1, 9, 9);
308 keyiter(k[2], r0, r4, r2, 10, 10);
309 keyiter(k[3], r1, r0, r3, 11, 11);
310 keyiter(k[4], r2, r1, r4, 12, 12);
311 keyiter(k[5], r3, r2, r0, 13, 13);
312 keyiter(k[6], r4, r3, r1, 14, 14);
313 keyiter(k[7], r0, r4, r2, 15, 15);
314 keyiter(k[8], r1, r0, r3, 16, 16);
315 keyiter(k[9], r2, r1, r4, 17, 17);
316 keyiter(k[10], r3, r2, r0, 18, 18);
317 keyiter(k[11], r4, r3, r1, 19, 19);
318 keyiter(k[12], r0, r4, r2, 20, 20);
319 keyiter(k[13], r1, r0, r3, 21, 21);
320 keyiter(k[14], r2, r1, r4, 22, 22);
321 keyiter(k[15], r3, r2, r0, 23, 23);
322 keyiter(k[16], r4, r3, r1, 24, 24);
323 keyiter(k[17], r0, r4, r2, 25, 25);
324 keyiter(k[18], r1, r0, r3, 26, 26);
325 keyiter(k[19], r2, r1, r4, 27, 27);
326 keyiter(k[20], r3, r2, r0, 28, 28);
327 keyiter(k[21], r4, r3, r1, 29, 29);
328 keyiter(k[22], r0, r4, r2, 30, 30);
329 keyiter(k[23], r1, r0, r3, 31, 31);
330
331 k += 50;
332
333 keyiter(k[-26], r2, r1, r4, 32, -18);
334 keyiter(k[-25], r3, r2, r0, 33, -17);
335 keyiter(k[-24], r4, r3, r1, 34, -16);
336 keyiter(k[-23], r0, r4, r2, 35, -15);
337 keyiter(k[-22], r1, r0, r3, 36, -14);
338 keyiter(k[-21], r2, r1, r4, 37, -13);
339 keyiter(k[-20], r3, r2, r0, 38, -12);
340 keyiter(k[-19], r4, r3, r1, 39, -11);
341 keyiter(k[-18], r0, r4, r2, 40, -10);
342 keyiter(k[-17], r1, r0, r3, 41, -9);
343 keyiter(k[-16], r2, r1, r4, 42, -8);
344 keyiter(k[-15], r3, r2, r0, 43, -7);
345 keyiter(k[-14], r4, r3, r1, 44, -6);
346 keyiter(k[-13], r0, r4, r2, 45, -5);
347 keyiter(k[-12], r1, r0, r3, 46, -4);
348 keyiter(k[-11], r2, r1, r4, 47, -3);
349 keyiter(k[-10], r3, r2, r0, 48, -2);
350 keyiter(k[-9], r4, r3, r1, 49, -1);
351 keyiter(k[-8], r0, r4, r2, 50, 0);
352 keyiter(k[-7], r1, r0, r3, 51, 1);
353 keyiter(k[-6], r2, r1, r4, 52, 2);
354 keyiter(k[-5], r3, r2, r0, 53, 3);
355 keyiter(k[-4], r4, r3, r1, 54, 4);
356 keyiter(k[-3], r0, r4, r2, 55, 5);
357 keyiter(k[-2], r1, r0, r3, 56, 6);
358 keyiter(k[-1], r2, r1, r4, 57, 7);
359 keyiter(k[0], r3, r2, r0, 58, 8);
360 keyiter(k[1], r4, r3, r1, 59, 9);
361 keyiter(k[2], r0, r4, r2, 60, 10);
362 keyiter(k[3], r1, r0, r3, 61, 11);
363 keyiter(k[4], r2, r1, r4, 62, 12);
364 keyiter(k[5], r3, r2, r0, 63, 13);
365 keyiter(k[6], r4, r3, r1, 64, 14);
366 keyiter(k[7], r0, r4, r2, 65, 15);
367 keyiter(k[8], r1, r0, r3, 66, 16);
368 keyiter(k[9], r2, r1, r4, 67, 17);
369 keyiter(k[10], r3, r2, r0, 68, 18);
370 keyiter(k[11], r4, r3, r1, 69, 19);
371 keyiter(k[12], r0, r4, r2, 70, 20);
372 keyiter(k[13], r1, r0, r3, 71, 21);
373 keyiter(k[14], r2, r1, r4, 72, 22);
374 keyiter(k[15], r3, r2, r0, 73, 23);
375 keyiter(k[16], r4, r3, r1, 74, 24);
376 keyiter(k[17], r0, r4, r2, 75, 25);
377 keyiter(k[18], r1, r0, r3, 76, 26);
378 keyiter(k[19], r2, r1, r4, 77, 27);
379 keyiter(k[20], r3, r2, r0, 78, 28);
380 keyiter(k[21], r4, r3, r1, 79, 29);
381 keyiter(k[22], r0, r4, r2, 80, 30);
382 keyiter(k[23], r1, r0, r3, 81, 31);
383
384 k += 50;
385
386 keyiter(k[-26], r2, r1, r4, 82, -18);
387 keyiter(k[-25], r3, r2, r0, 83, -17);
388 keyiter(k[-24], r4, r3, r1, 84, -16);
389 keyiter(k[-23], r0, r4, r2, 85, -15);
390 keyiter(k[-22], r1, r0, r3, 86, -14);
391 keyiter(k[-21], r2, r1, r4, 87, -13);
392 keyiter(k[-20], r3, r2, r0, 88, -12);
393 keyiter(k[-19], r4, r3, r1, 89, -11);
394 keyiter(k[-18], r0, r4, r2, 90, -10);
395 keyiter(k[-17], r1, r0, r3, 91, -9);
396 keyiter(k[-16], r2, r1, r4, 92, -8);
397 keyiter(k[-15], r3, r2, r0, 93, -7);
398 keyiter(k[-14], r4, r3, r1, 94, -6);
399 keyiter(k[-13], r0, r4, r2, 95, -5);
400 keyiter(k[-12], r1, r0, r3, 96, -4);
401 keyiter(k[-11], r2, r1, r4, 97, -3);
402 keyiter(k[-10], r3, r2, r0, 98, -2);
403 keyiter(k[-9], r4, r3, r1, 99, -1);
404 keyiter(k[-8], r0, r4, r2, 100, 0);
405 keyiter(k[-7], r1, r0, r3, 101, 1);
406 keyiter(k[-6], r2, r1, r4, 102, 2);
407 keyiter(k[-5], r3, r2, r0, 103, 3);
408 keyiter(k[-4], r4, r3, r1, 104, 4);
409 keyiter(k[-3], r0, r4, r2, 105, 5);
410 keyiter(k[-2], r1, r0, r3, 106, 6);
411 keyiter(k[-1], r2, r1, r4, 107, 7);
412 keyiter(k[0], r3, r2, r0, 108, 8);
413 keyiter(k[1], r4, r3, r1, 109, 9);
414 keyiter(k[2], r0, r4, r2, 110, 10);
415 keyiter(k[3], r1, r0, r3, 111, 11);
416 keyiter(k[4], r2, r1, r4, 112, 12);
417 keyiter(k[5], r3, r2, r0, 113, 13);
418 keyiter(k[6], r4, r3, r1, 114, 14);
419 keyiter(k[7], r0, r4, r2, 115, 15);
420 keyiter(k[8], r1, r0, r3, 116, 16);
421 keyiter(k[9], r2, r1, r4, 117, 17);
422 keyiter(k[10], r3, r2, r0, 118, 18);
423 keyiter(k[11], r4, r3, r1, 119, 19);
424 keyiter(k[12], r0, r4, r2, 120, 20);
425 keyiter(k[13], r1, r0, r3, 121, 21);
426 keyiter(k[14], r2, r1, r4, 122, 22);
427 keyiter(k[15], r3, r2, r0, 123, 23);
428 keyiter(k[16], r4, r3, r1, 124, 24);
429 keyiter(k[17], r0, r4, r2, 125, 25);
430 keyiter(k[18], r1, r0, r3, 126, 26);
431 keyiter(k[19], r2, r1, r4, 127, 27);
432 keyiter(k[20], r3, r2, r0, 128, 28);
433 keyiter(k[21], r4, r3, r1, 129, 29);
434 keyiter(k[22], r0, r4, r2, 130, 30);
435 keyiter(k[23], r1, r0, r3, 131, 31);
436
437 /* Apply S-boxes */
438 __serpent_setkey_sbox(r0, r1, r2, r3, r4, ctx->expkey);
439
440 return 0;
441}
442EXPORT_SYMBOL_GPL(__serpent_setkey);
443
444int serpent_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
445{
446 return __serpent_setkey(crypto_tfm_ctx(tfm), key, keylen);
447}
448EXPORT_SYMBOL_GPL(serpent_setkey);
449
450void __serpent_encrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src)
451{
452 const u32 *k = ctx->expkey;
453 const __le32 *s = (const __le32 *)src;
454 __le32 *d = (__le32 *)dst;
455 u32 r0, r1, r2, r3, r4;
456
457/*
458 * Note: The conversions between u8* and u32* might cause trouble
459 * on architectures with stricter alignment rules than x86
460 */
461
462 r0 = le32_to_cpu(s[0]);
463 r1 = le32_to_cpu(s[1]);
464 r2 = le32_to_cpu(s[2]);
465 r3 = le32_to_cpu(s[3]);
466
467 K(r0, r1, r2, r3, 0);
468 S0(r0, r1, r2, r3, r4); LK(r2, r1, r3, r0, r4, 1);
469 S1(r2, r1, r3, r0, r4); LK(r4, r3, r0, r2, r1, 2);
470 S2(r4, r3, r0, r2, r1); LK(r1, r3, r4, r2, r0, 3);
471 S3(r1, r3, r4, r2, r0); LK(r2, r0, r3, r1, r4, 4);
472 S4(r2, r0, r3, r1, r4); LK(r0, r3, r1, r4, r2, 5);
473 S5(r0, r3, r1, r4, r2); LK(r2, r0, r3, r4, r1, 6);
474 S6(r2, r0, r3, r4, r1); LK(r3, r1, r0, r4, r2, 7);
475 S7(r3, r1, r0, r4, r2); LK(r2, r0, r4, r3, r1, 8);
476 S0(r2, r0, r4, r3, r1); LK(r4, r0, r3, r2, r1, 9);
477 S1(r4, r0, r3, r2, r1); LK(r1, r3, r2, r4, r0, 10);
478 S2(r1, r3, r2, r4, r0); LK(r0, r3, r1, r4, r2, 11);
479 S3(r0, r3, r1, r4, r2); LK(r4, r2, r3, r0, r1, 12);
480 S4(r4, r2, r3, r0, r1); LK(r2, r3, r0, r1, r4, 13);
481 S5(r2, r3, r0, r1, r4); LK(r4, r2, r3, r1, r0, 14);
482 S6(r4, r2, r3, r1, r0); LK(r3, r0, r2, r1, r4, 15);
483 S7(r3, r0, r2, r1, r4); LK(r4, r2, r1, r3, r0, 16);
484 S0(r4, r2, r1, r3, r0); LK(r1, r2, r3, r4, r0, 17);
485 S1(r1, r2, r3, r4, r0); LK(r0, r3, r4, r1, r2, 18);
486 S2(r0, r3, r4, r1, r2); LK(r2, r3, r0, r1, r4, 19);
487 S3(r2, r3, r0, r1, r4); LK(r1, r4, r3, r2, r0, 20);
488 S4(r1, r4, r3, r2, r0); LK(r4, r3, r2, r0, r1, 21);
489 S5(r4, r3, r2, r0, r1); LK(r1, r4, r3, r0, r2, 22);
490 S6(r1, r4, r3, r0, r2); LK(r3, r2, r4, r0, r1, 23);
491 S7(r3, r2, r4, r0, r1); LK(r1, r4, r0, r3, r2, 24);
492 S0(r1, r4, r0, r3, r2); LK(r0, r4, r3, r1, r2, 25);
493 S1(r0, r4, r3, r1, r2); LK(r2, r3, r1, r0, r4, 26);
494 S2(r2, r3, r1, r0, r4); LK(r4, r3, r2, r0, r1, 27);
495 S3(r4, r3, r2, r0, r1); LK(r0, r1, r3, r4, r2, 28);
496 S4(r0, r1, r3, r4, r2); LK(r1, r3, r4, r2, r0, 29);
497 S5(r1, r3, r4, r2, r0); LK(r0, r1, r3, r2, r4, 30);
498 S6(r0, r1, r3, r2, r4); LK(r3, r4, r1, r2, r0, 31);
499 S7(r3, r4, r1, r2, r0); K(r0, r1, r2, r3, 32);
500
501 d[0] = cpu_to_le32(r0);
502 d[1] = cpu_to_le32(r1);
503 d[2] = cpu_to_le32(r2);
504 d[3] = cpu_to_le32(r3);
505}
506EXPORT_SYMBOL_GPL(__serpent_encrypt);
507
508static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
509{
510 struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
511
512 __serpent_encrypt(ctx, dst, src);
513}
514
515void __serpent_decrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src)
516{
517 const u32 *k = ctx->expkey;
518 const __le32 *s = (const __le32 *)src;
519 __le32 *d = (__le32 *)dst;
520 u32 r0, r1, r2, r3, r4;
521
522 r0 = le32_to_cpu(s[0]);
523 r1 = le32_to_cpu(s[1]);
524 r2 = le32_to_cpu(s[2]);
525 r3 = le32_to_cpu(s[3]);
526
527 K(r0, r1, r2, r3, 32);
528 SI7(r0, r1, r2, r3, r4); KL(r1, r3, r0, r4, r2, 31);
529 SI6(r1, r3, r0, r4, r2); KL(r0, r2, r4, r1, r3, 30);
530 SI5(r0, r2, r4, r1, r3); KL(r2, r3, r0, r4, r1, 29);
531 SI4(r2, r3, r0, r4, r1); KL(r2, r0, r1, r4, r3, 28);
532 SI3(r2, r0, r1, r4, r3); KL(r1, r2, r3, r4, r0, 27);
533 SI2(r1, r2, r3, r4, r0); KL(r2, r0, r4, r3, r1, 26);
534 SI1(r2, r0, r4, r3, r1); KL(r1, r0, r4, r3, r2, 25);
535 SI0(r1, r0, r4, r3, r2); KL(r4, r2, r0, r1, r3, 24);
536 SI7(r4, r2, r0, r1, r3); KL(r2, r1, r4, r3, r0, 23);
537 SI6(r2, r1, r4, r3, r0); KL(r4, r0, r3, r2, r1, 22);
538 SI5(r4, r0, r3, r2, r1); KL(r0, r1, r4, r3, r2, 21);
539 SI4(r0, r1, r4, r3, r2); KL(r0, r4, r2, r3, r1, 20);
540 SI3(r0, r4, r2, r3, r1); KL(r2, r0, r1, r3, r4, 19);
541 SI2(r2, r0, r1, r3, r4); KL(r0, r4, r3, r1, r2, 18);
542 SI1(r0, r4, r3, r1, r2); KL(r2, r4, r3, r1, r0, 17);
543 SI0(r2, r4, r3, r1, r0); KL(r3, r0, r4, r2, r1, 16);
544 SI7(r3, r0, r4, r2, r1); KL(r0, r2, r3, r1, r4, 15);
545 SI6(r0, r2, r3, r1, r4); KL(r3, r4, r1, r0, r2, 14);
546 SI5(r3, r4, r1, r0, r2); KL(r4, r2, r3, r1, r0, 13);
547 SI4(r4, r2, r3, r1, r0); KL(r4, r3, r0, r1, r2, 12);
548 SI3(r4, r3, r0, r1, r2); KL(r0, r4, r2, r1, r3, 11);
549 SI2(r0, r4, r2, r1, r3); KL(r4, r3, r1, r2, r0, 10);
550 SI1(r4, r3, r1, r2, r0); KL(r0, r3, r1, r2, r4, 9);
551 SI0(r0, r3, r1, r2, r4); KL(r1, r4, r3, r0, r2, 8);
552 SI7(r1, r4, r3, r0, r2); KL(r4, r0, r1, r2, r3, 7);
553 SI6(r4, r0, r1, r2, r3); KL(r1, r3, r2, r4, r0, 6);
554 SI5(r1, r3, r2, r4, r0); KL(r3, r0, r1, r2, r4, 5);
555 SI4(r3, r0, r1, r2, r4); KL(r3, r1, r4, r2, r0, 4);
556 SI3(r3, r1, r4, r2, r0); KL(r4, r3, r0, r2, r1, 3);
557 SI2(r4, r3, r0, r2, r1); KL(r3, r1, r2, r0, r4, 2);
558 SI1(r3, r1, r2, r0, r4); KL(r4, r1, r2, r0, r3, 1);
559 SI0(r4, r1, r2, r0, r3); K(r2, r3, r1, r4, 0);
560
561 d[0] = cpu_to_le32(r2);
562 d[1] = cpu_to_le32(r3);
563 d[2] = cpu_to_le32(r1);
564 d[3] = cpu_to_le32(r4);
565}
566EXPORT_SYMBOL_GPL(__serpent_decrypt);
567
568static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
569{
570 struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
571
572 __serpent_decrypt(ctx, dst, src);
573}
574
575static int tnepres_setkey(struct crypto_tfm *tfm, const u8 *key,
576 unsigned int keylen)
577{
578 u8 rev_key[SERPENT_MAX_KEY_SIZE];
579 int i;
580
581 for (i = 0; i < keylen; ++i)
582 rev_key[keylen - i - 1] = key[i];
583
584 return serpent_setkey(tfm, rev_key, keylen);
585}
586
587static void tnepres_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
588{
589 const u32 * const s = (const u32 * const)src;
590 u32 * const d = (u32 * const)dst;
591
592 u32 rs[4], rd[4];
593
594 rs[0] = swab32(s[3]);
595 rs[1] = swab32(s[2]);
596 rs[2] = swab32(s[1]);
597 rs[3] = swab32(s[0]);
598
599 serpent_encrypt(tfm, (u8 *)rd, (u8 *)rs);
600
601 d[0] = swab32(rd[3]);
602 d[1] = swab32(rd[2]);
603 d[2] = swab32(rd[1]);
604 d[3] = swab32(rd[0]);
605}
606
607static void tnepres_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
608{
609 const u32 * const s = (const u32 * const)src;
610 u32 * const d = (u32 * const)dst;
611
612 u32 rs[4], rd[4];
613
614 rs[0] = swab32(s[3]);
615 rs[1] = swab32(s[2]);
616 rs[2] = swab32(s[1]);
617 rs[3] = swab32(s[0]);
618
619 serpent_decrypt(tfm, (u8 *)rd, (u8 *)rs);
620
621 d[0] = swab32(rd[3]);
622 d[1] = swab32(rd[2]);
623 d[2] = swab32(rd[1]);
624 d[3] = swab32(rd[0]);
625}
626
627static struct crypto_alg srp_algs[2] = { {
628 .cra_name = "serpent",
629 .cra_driver_name = "serpent-generic",
630 .cra_priority = 100,
631 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
632 .cra_blocksize = SERPENT_BLOCK_SIZE,
633 .cra_ctxsize = sizeof(struct serpent_ctx),
634 .cra_alignmask = 3,
635 .cra_module = THIS_MODULE,
636 .cra_u = { .cipher = {
637 .cia_min_keysize = SERPENT_MIN_KEY_SIZE,
638 .cia_max_keysize = SERPENT_MAX_KEY_SIZE,
639 .cia_setkey = serpent_setkey,
640 .cia_encrypt = serpent_encrypt,
641 .cia_decrypt = serpent_decrypt } }
642}, {
643 .cra_name = "tnepres",
644 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
645 .cra_blocksize = SERPENT_BLOCK_SIZE,
646 .cra_ctxsize = sizeof(struct serpent_ctx),
647 .cra_alignmask = 3,
648 .cra_module = THIS_MODULE,
649 .cra_u = { .cipher = {
650 .cia_min_keysize = SERPENT_MIN_KEY_SIZE,
651 .cia_max_keysize = SERPENT_MAX_KEY_SIZE,
652 .cia_setkey = tnepres_setkey,
653 .cia_encrypt = tnepres_encrypt,
654 .cia_decrypt = tnepres_decrypt } }
655} };
656
657static int __init serpent_mod_init(void)
658{
659 return crypto_register_algs(srp_algs, ARRAY_SIZE(srp_algs));
660}
661
662static void __exit serpent_mod_fini(void)
663{
664 crypto_unregister_algs(srp_algs, ARRAY_SIZE(srp_algs));
665}
666
667module_init(serpent_mod_init);
668module_exit(serpent_mod_fini);
669
670MODULE_LICENSE("GPL");
671MODULE_DESCRIPTION("Serpent and tnepres (kerneli compatible serpent reversed) Cipher Algorithm");
672MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>");
673MODULE_ALIAS_CRYPTO("tnepres");
674MODULE_ALIAS_CRYPTO("serpent");
675MODULE_ALIAS_CRYPTO("serpent-generic");
676