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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Cryptographic API.
4 *
5 * Serpent Cipher Algorithm.
6 *
7 * Copyright (C) 2002 Dag Arne Osvik <[email protected]>
8 */
9
10#include <crypto/algapi.h>
11#include <linux/init.h>
12#include <linux/module.h>
13#include <linux/errno.h>
14#include <linux/unaligned.h>
15#include <linux/types.h>
16#include <crypto/serpent.h>
17
18/* Key is padded to the maximum of 256 bits before round key generation.
19 * Any key length <= 256 bits (32 bytes) is allowed by the algorithm.
20 */
21
22#define PHI 0x9e3779b9UL
23
24#define keyiter(a, b, c, d, i, j) \
25 ({ b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; b = rol32(b, 11); k[j] = b; })
26
27#define loadkeys(x0, x1, x2, x3, i) \
28 ({ x0 = k[i]; x1 = k[i+1]; x2 = k[i+2]; x3 = k[i+3]; })
29
30#define storekeys(x0, x1, x2, x3, i) \
31 ({ k[i] = x0; k[i+1] = x1; k[i+2] = x2; k[i+3] = x3; })
32
33#define store_and_load_keys(x0, x1, x2, x3, s, l) \
34 ({ storekeys(x0, x1, x2, x3, s); loadkeys(x0, x1, x2, x3, l); })
35
36#define K(x0, x1, x2, x3, i) ({ \
37 x3 ^= k[4*(i)+3]; x2 ^= k[4*(i)+2]; \
38 x1 ^= k[4*(i)+1]; x0 ^= k[4*(i)+0]; \
39 })
40
41#define LK(x0, x1, x2, x3, x4, i) ({ \
42 x0 = rol32(x0, 13);\
43 x2 = rol32(x2, 3); x1 ^= x0; x4 = x0 << 3; \
44 x3 ^= x2; x1 ^= x2; \
45 x1 = rol32(x1, 1); x3 ^= x4; \
46 x3 = rol32(x3, 7); x4 = x1; \
47 x0 ^= x1; x4 <<= 7; x2 ^= x3; \
48 x0 ^= x3; x2 ^= x4; x3 ^= k[4*i+3]; \
49 x1 ^= k[4*i+1]; x0 = rol32(x0, 5); x2 = rol32(x2, 22);\
50 x0 ^= k[4*i+0]; x2 ^= k[4*i+2]; \
51 })
52
53#define KL(x0, x1, x2, x3, x4, i) ({ \
54 x0 ^= k[4*i+0]; x1 ^= k[4*i+1]; x2 ^= k[4*i+2]; \
55 x3 ^= k[4*i+3]; x0 = ror32(x0, 5); x2 = ror32(x2, 22);\
56 x4 = x1; x2 ^= x3; x0 ^= x3; \
57 x4 <<= 7; x0 ^= x1; x1 = ror32(x1, 1); \
58 x2 ^= x4; x3 = ror32(x3, 7); x4 = x0 << 3; \
59 x1 ^= x0; x3 ^= x4; x0 = ror32(x0, 13);\
60 x1 ^= x2; x3 ^= x2; x2 = ror32(x2, 3); \
61 })
62
63#define S0(x0, x1, x2, x3, x4) ({ \
64 x4 = x3; \
65 x3 |= x0; x0 ^= x4; x4 ^= x2; \
66 x4 = ~x4; x3 ^= x1; x1 &= x0; \
67 x1 ^= x4; x2 ^= x0; x0 ^= x3; \
68 x4 |= x0; x0 ^= x2; x2 &= x1; \
69 x3 ^= x2; x1 = ~x1; x2 ^= x4; \
70 x1 ^= x2; \
71 })
72
73#define S1(x0, x1, x2, x3, x4) ({ \
74 x4 = x1; \
75 x1 ^= x0; x0 ^= x3; x3 = ~x3; \
76 x4 &= x1; x0 |= x1; x3 ^= x2; \
77 x0 ^= x3; x1 ^= x3; x3 ^= x4; \
78 x1 |= x4; x4 ^= x2; x2 &= x0; \
79 x2 ^= x1; x1 |= x0; x0 = ~x0; \
80 x0 ^= x2; x4 ^= x1; \
81 })
82
83#define S2(x0, x1, x2, x3, x4) ({ \
84 x3 = ~x3; \
85 x1 ^= x0; x4 = x0; x0 &= x2; \
86 x0 ^= x3; x3 |= x4; x2 ^= x1; \
87 x3 ^= x1; x1 &= x0; x0 ^= x2; \
88 x2 &= x3; x3 |= x1; x0 = ~x0; \
89 x3 ^= x0; x4 ^= x0; x0 ^= x2; \
90 x1 |= x2; \
91 })
92
93#define S3(x0, x1, x2, x3, x4) ({ \
94 x4 = x1; \
95 x1 ^= x3; x3 |= x0; x4 &= x0; \
96 x0 ^= x2; x2 ^= x1; x1 &= x3; \
97 x2 ^= x3; x0 |= x4; x4 ^= x3; \
98 x1 ^= x0; x0 &= x3; x3 &= x4; \
99 x3 ^= x2; x4 |= x1; x2 &= x1; \
100 x4 ^= x3; x0 ^= x3; x3 ^= x2; \
101 })
102
103#define S4(x0, x1, x2, x3, x4) ({ \
104 x4 = x3; \
105 x3 &= x0; x0 ^= x4; \
106 x3 ^= x2; x2 |= x4; x0 ^= x1; \
107 x4 ^= x3; x2 |= x0; \
108 x2 ^= x1; x1 &= x0; \
109 x1 ^= x4; x4 &= x2; x2 ^= x3; \
110 x4 ^= x0; x3 |= x1; x1 = ~x1; \
111 x3 ^= x0; \
112 })
113
114#define S5(x0, x1, x2, x3, x4) ({ \
115 x4 = x1; x1 |= x0; \
116 x2 ^= x1; x3 = ~x3; x4 ^= x0; \
117 x0 ^= x2; x1 &= x4; x4 |= x3; \
118 x4 ^= x0; x0 &= x3; x1 ^= x3; \
119 x3 ^= x2; x0 ^= x1; x2 &= x4; \
120 x1 ^= x2; x2 &= x0; \
121 x3 ^= x2; \
122 })
123
124#define S6(x0, x1, x2, x3, x4) ({ \
125 x4 = x1; \
126 x3 ^= x0; x1 ^= x2; x2 ^= x0; \
127 x0 &= x3; x1 |= x3; x4 = ~x4; \
128 x0 ^= x1; x1 ^= x2; \
129 x3 ^= x4; x4 ^= x0; x2 &= x0; \
130 x4 ^= x1; x2 ^= x3; x3 &= x1; \
131 x3 ^= x0; x1 ^= x2; \
132 })
133
134#define S7(x0, x1, x2, x3, x4) ({ \
135 x1 = ~x1; \
136 x4 = x1; x0 = ~x0; x1 &= x2; \
137 x1 ^= x3; x3 |= x4; x4 ^= x2; \
138 x2 ^= x3; x3 ^= x0; x0 |= x1; \
139 x2 &= x0; x0 ^= x4; x4 ^= x3; \
140 x3 &= x0; x4 ^= x1; \
141 x2 ^= x4; x3 ^= x1; x4 |= x0; \
142 x4 ^= x1; \
143 })
144
145#define SI0(x0, x1, x2, x3, x4) ({ \
146 x4 = x3; x1 ^= x0; \
147 x3 |= x1; x4 ^= x1; x0 = ~x0; \
148 x2 ^= x3; x3 ^= x0; x0 &= x1; \
149 x0 ^= x2; x2 &= x3; x3 ^= x4; \
150 x2 ^= x3; x1 ^= x3; x3 &= x0; \
151 x1 ^= x0; x0 ^= x2; x4 ^= x3; \
152 })
153
154#define SI1(x0, x1, x2, x3, x4) ({ \
155 x1 ^= x3; x4 = x0; \
156 x0 ^= x2; x2 = ~x2; x4 |= x1; \
157 x4 ^= x3; x3 &= x1; x1 ^= x2; \
158 x2 &= x4; x4 ^= x1; x1 |= x3; \
159 x3 ^= x0; x2 ^= x0; x0 |= x4; \
160 x2 ^= x4; x1 ^= x0; \
161 x4 ^= x1; \
162 })
163
164#define SI2(x0, x1, x2, x3, x4) ({ \
165 x2 ^= x1; x4 = x3; x3 = ~x3; \
166 x3 |= x2; x2 ^= x4; x4 ^= x0; \
167 x3 ^= x1; x1 |= x2; x2 ^= x0; \
168 x1 ^= x4; x4 |= x3; x2 ^= x3; \
169 x4 ^= x2; x2 &= x1; \
170 x2 ^= x3; x3 ^= x4; x4 ^= x0; \
171 })
172
173#define SI3(x0, x1, x2, x3, x4) ({ \
174 x2 ^= x1; \
175 x4 = x1; x1 &= x2; \
176 x1 ^= x0; x0 |= x4; x4 ^= x3; \
177 x0 ^= x3; x3 |= x1; x1 ^= x2; \
178 x1 ^= x3; x0 ^= x2; x2 ^= x3; \
179 x3 &= x1; x1 ^= x0; x0 &= x2; \
180 x4 ^= x3; x3 ^= x0; x0 ^= x1; \
181 })
182
183#define SI4(x0, x1, x2, x3, x4) ({ \
184 x2 ^= x3; x4 = x0; x0 &= x1; \
185 x0 ^= x2; x2 |= x3; x4 = ~x4; \
186 x1 ^= x0; x0 ^= x2; x2 &= x4; \
187 x2 ^= x0; x0 |= x4; \
188 x0 ^= x3; x3 &= x2; \
189 x4 ^= x3; x3 ^= x1; x1 &= x0; \
190 x4 ^= x1; x0 ^= x3; \
191 })
192
193#define SI5(x0, x1, x2, x3, x4) ({ \
194 x4 = x1; x1 |= x2; \
195 x2 ^= x4; x1 ^= x3; x3 &= x4; \
196 x2 ^= x3; x3 |= x0; x0 = ~x0; \
197 x3 ^= x2; x2 |= x0; x4 ^= x1; \
198 x2 ^= x4; x4 &= x0; x0 ^= x1; \
199 x1 ^= x3; x0 &= x2; x2 ^= x3; \
200 x0 ^= x2; x2 ^= x4; x4 ^= x3; \
201 })
202
203#define SI6(x0, x1, x2, x3, x4) ({ \
204 x0 ^= x2; \
205 x4 = x0; x0 &= x3; x2 ^= x3; \
206 x0 ^= x2; x3 ^= x1; x2 |= x4; \
207 x2 ^= x3; x3 &= x0; x0 = ~x0; \
208 x3 ^= x1; x1 &= x2; x4 ^= x0; \
209 x3 ^= x4; x4 ^= x2; x0 ^= x1; \
210 x2 ^= x0; \
211 })
212
213#define SI7(x0, x1, x2, x3, x4) ({ \
214 x4 = x3; x3 &= x0; x0 ^= x2; \
215 x2 |= x4; x4 ^= x1; x0 = ~x0; \
216 x1 |= x3; x4 ^= x0; x0 &= x2; \
217 x0 ^= x1; x1 &= x2; x3 ^= x2; \
218 x4 ^= x3; x2 &= x3; x3 |= x0; \
219 x1 ^= x4; x3 ^= x4; x4 &= x0; \
220 x4 ^= x2; \
221 })
222
223/*
224 * both gcc and clang have misoptimized this function in the past,
225 * producing horrible object code from spilling temporary variables
226 * on the stack. Forcing this part out of line avoids that.
227 */
228static noinline void __serpent_setkey_sbox(u32 r0, u32 r1, u32 r2,
229 u32 r3, u32 r4, u32 *k)
230{
231 k += 100;
232 S3(r3, r4, r0, r1, r2); store_and_load_keys(r1, r2, r4, r3, 28, 24);
233 S4(r1, r2, r4, r3, r0); store_and_load_keys(r2, r4, r3, r0, 24, 20);
234 S5(r2, r4, r3, r0, r1); store_and_load_keys(r1, r2, r4, r0, 20, 16);
235 S6(r1, r2, r4, r0, r3); store_and_load_keys(r4, r3, r2, r0, 16, 12);
236 S7(r4, r3, r2, r0, r1); store_and_load_keys(r1, r2, r0, r4, 12, 8);
237 S0(r1, r2, r0, r4, r3); store_and_load_keys(r0, r2, r4, r1, 8, 4);
238 S1(r0, r2, r4, r1, r3); store_and_load_keys(r3, r4, r1, r0, 4, 0);
239 S2(r3, r4, r1, r0, r2); store_and_load_keys(r2, r4, r3, r0, 0, -4);
240 S3(r2, r4, r3, r0, r1); store_and_load_keys(r0, r1, r4, r2, -4, -8);
241 S4(r0, r1, r4, r2, r3); store_and_load_keys(r1, r4, r2, r3, -8, -12);
242 S5(r1, r4, r2, r3, r0); store_and_load_keys(r0, r1, r4, r3, -12, -16);
243 S6(r0, r1, r4, r3, r2); store_and_load_keys(r4, r2, r1, r3, -16, -20);
244 S7(r4, r2, r1, r3, r0); store_and_load_keys(r0, r1, r3, r4, -20, -24);
245 S0(r0, r1, r3, r4, r2); store_and_load_keys(r3, r1, r4, r0, -24, -28);
246 k -= 50;
247 S1(r3, r1, r4, r0, r2); store_and_load_keys(r2, r4, r0, r3, 22, 18);
248 S2(r2, r4, r0, r3, r1); store_and_load_keys(r1, r4, r2, r3, 18, 14);
249 S3(r1, r4, r2, r3, r0); store_and_load_keys(r3, r0, r4, r1, 14, 10);
250 S4(r3, r0, r4, r1, r2); store_and_load_keys(r0, r4, r1, r2, 10, 6);
251 S5(r0, r4, r1, r2, r3); store_and_load_keys(r3, r0, r4, r2, 6, 2);
252 S6(r3, r0, r4, r2, r1); store_and_load_keys(r4, r1, r0, r2, 2, -2);
253 S7(r4, r1, r0, r2, r3); store_and_load_keys(r3, r0, r2, r4, -2, -6);
254 S0(r3, r0, r2, r4, r1); store_and_load_keys(r2, r0, r4, r3, -6, -10);
255 S1(r2, r0, r4, r3, r1); store_and_load_keys(r1, r4, r3, r2, -10, -14);
256 S2(r1, r4, r3, r2, r0); store_and_load_keys(r0, r4, r1, r2, -14, -18);
257 S3(r0, r4, r1, r2, r3); store_and_load_keys(r2, r3, r4, r0, -18, -22);
258 k -= 50;
259 S4(r2, r3, r4, r0, r1); store_and_load_keys(r3, r4, r0, r1, 28, 24);
260 S5(r3, r4, r0, r1, r2); store_and_load_keys(r2, r3, r4, r1, 24, 20);
261 S6(r2, r3, r4, r1, r0); store_and_load_keys(r4, r0, r3, r1, 20, 16);
262 S7(r4, r0, r3, r1, r2); store_and_load_keys(r2, r3, r1, r4, 16, 12);
263 S0(r2, r3, r1, r4, r0); store_and_load_keys(r1, r3, r4, r2, 12, 8);
264 S1(r1, r3, r4, r2, r0); store_and_load_keys(r0, r4, r2, r1, 8, 4);
265 S2(r0, r4, r2, r1, r3); store_and_load_keys(r3, r4, r0, r1, 4, 0);
266 S3(r3, r4, r0, r1, r2); storekeys(r1, r2, r4, r3, 0);
267}
268
269int __serpent_setkey(struct serpent_ctx *ctx, const u8 *key,
270 unsigned int keylen)
271{
272 u32 *k = ctx->expkey;
273 u8 *k8 = (u8 *)k;
274 u32 r0, r1, r2, r3, r4;
275 __le32 *lk;
276 int i;
277
278 /* Copy key, add padding */
279
280 for (i = 0; i < keylen; ++i)
281 k8[i] = key[i];
282 if (i < SERPENT_MAX_KEY_SIZE)
283 k8[i++] = 1;
284 while (i < SERPENT_MAX_KEY_SIZE)
285 k8[i++] = 0;
286
287 lk = (__le32 *)k;
288 k[0] = le32_to_cpu(lk[0]);
289 k[1] = le32_to_cpu(lk[1]);
290 k[2] = le32_to_cpu(lk[2]);
291 k[3] = le32_to_cpu(lk[3]);
292 k[4] = le32_to_cpu(lk[4]);
293 k[5] = le32_to_cpu(lk[5]);
294 k[6] = le32_to_cpu(lk[6]);
295 k[7] = le32_to_cpu(lk[7]);
296
297 /* Expand key using polynomial */
298
299 r0 = k[3];
300 r1 = k[4];
301 r2 = k[5];
302 r3 = k[6];
303 r4 = k[7];
304
305 keyiter(k[0], r0, r4, r2, 0, 0);
306 keyiter(k[1], r1, r0, r3, 1, 1);
307 keyiter(k[2], r2, r1, r4, 2, 2);
308 keyiter(k[3], r3, r2, r0, 3, 3);
309 keyiter(k[4], r4, r3, r1, 4, 4);
310 keyiter(k[5], r0, r4, r2, 5, 5);
311 keyiter(k[6], r1, r0, r3, 6, 6);
312 keyiter(k[7], r2, r1, r4, 7, 7);
313
314 keyiter(k[0], r3, r2, r0, 8, 8);
315 keyiter(k[1], r4, r3, r1, 9, 9);
316 keyiter(k[2], r0, r4, r2, 10, 10);
317 keyiter(k[3], r1, r0, r3, 11, 11);
318 keyiter(k[4], r2, r1, r4, 12, 12);
319 keyiter(k[5], r3, r2, r0, 13, 13);
320 keyiter(k[6], r4, r3, r1, 14, 14);
321 keyiter(k[7], r0, r4, r2, 15, 15);
322 keyiter(k[8], r1, r0, r3, 16, 16);
323 keyiter(k[9], r2, r1, r4, 17, 17);
324 keyiter(k[10], r3, r2, r0, 18, 18);
325 keyiter(k[11], r4, r3, r1, 19, 19);
326 keyiter(k[12], r0, r4, r2, 20, 20);
327 keyiter(k[13], r1, r0, r3, 21, 21);
328 keyiter(k[14], r2, r1, r4, 22, 22);
329 keyiter(k[15], r3, r2, r0, 23, 23);
330 keyiter(k[16], r4, r3, r1, 24, 24);
331 keyiter(k[17], r0, r4, r2, 25, 25);
332 keyiter(k[18], r1, r0, r3, 26, 26);
333 keyiter(k[19], r2, r1, r4, 27, 27);
334 keyiter(k[20], r3, r2, r0, 28, 28);
335 keyiter(k[21], r4, r3, r1, 29, 29);
336 keyiter(k[22], r0, r4, r2, 30, 30);
337 keyiter(k[23], r1, r0, r3, 31, 31);
338
339 k += 50;
340
341 keyiter(k[-26], r2, r1, r4, 32, -18);
342 keyiter(k[-25], r3, r2, r0, 33, -17);
343 keyiter(k[-24], r4, r3, r1, 34, -16);
344 keyiter(k[-23], r0, r4, r2, 35, -15);
345 keyiter(k[-22], r1, r0, r3, 36, -14);
346 keyiter(k[-21], r2, r1, r4, 37, -13);
347 keyiter(k[-20], r3, r2, r0, 38, -12);
348 keyiter(k[-19], r4, r3, r1, 39, -11);
349 keyiter(k[-18], r0, r4, r2, 40, -10);
350 keyiter(k[-17], r1, r0, r3, 41, -9);
351 keyiter(k[-16], r2, r1, r4, 42, -8);
352 keyiter(k[-15], r3, r2, r0, 43, -7);
353 keyiter(k[-14], r4, r3, r1, 44, -6);
354 keyiter(k[-13], r0, r4, r2, 45, -5);
355 keyiter(k[-12], r1, r0, r3, 46, -4);
356 keyiter(k[-11], r2, r1, r4, 47, -3);
357 keyiter(k[-10], r3, r2, r0, 48, -2);
358 keyiter(k[-9], r4, r3, r1, 49, -1);
359 keyiter(k[-8], r0, r4, r2, 50, 0);
360 keyiter(k[-7], r1, r0, r3, 51, 1);
361 keyiter(k[-6], r2, r1, r4, 52, 2);
362 keyiter(k[-5], r3, r2, r0, 53, 3);
363 keyiter(k[-4], r4, r3, r1, 54, 4);
364 keyiter(k[-3], r0, r4, r2, 55, 5);
365 keyiter(k[-2], r1, r0, r3, 56, 6);
366 keyiter(k[-1], r2, r1, r4, 57, 7);
367 keyiter(k[0], r3, r2, r0, 58, 8);
368 keyiter(k[1], r4, r3, r1, 59, 9);
369 keyiter(k[2], r0, r4, r2, 60, 10);
370 keyiter(k[3], r1, r0, r3, 61, 11);
371 keyiter(k[4], r2, r1, r4, 62, 12);
372 keyiter(k[5], r3, r2, r0, 63, 13);
373 keyiter(k[6], r4, r3, r1, 64, 14);
374 keyiter(k[7], r0, r4, r2, 65, 15);
375 keyiter(k[8], r1, r0, r3, 66, 16);
376 keyiter(k[9], r2, r1, r4, 67, 17);
377 keyiter(k[10], r3, r2, r0, 68, 18);
378 keyiter(k[11], r4, r3, r1, 69, 19);
379 keyiter(k[12], r0, r4, r2, 70, 20);
380 keyiter(k[13], r1, r0, r3, 71, 21);
381 keyiter(k[14], r2, r1, r4, 72, 22);
382 keyiter(k[15], r3, r2, r0, 73, 23);
383 keyiter(k[16], r4, r3, r1, 74, 24);
384 keyiter(k[17], r0, r4, r2, 75, 25);
385 keyiter(k[18], r1, r0, r3, 76, 26);
386 keyiter(k[19], r2, r1, r4, 77, 27);
387 keyiter(k[20], r3, r2, r0, 78, 28);
388 keyiter(k[21], r4, r3, r1, 79, 29);
389 keyiter(k[22], r0, r4, r2, 80, 30);
390 keyiter(k[23], r1, r0, r3, 81, 31);
391
392 k += 50;
393
394 keyiter(k[-26], r2, r1, r4, 82, -18);
395 keyiter(k[-25], r3, r2, r0, 83, -17);
396 keyiter(k[-24], r4, r3, r1, 84, -16);
397 keyiter(k[-23], r0, r4, r2, 85, -15);
398 keyiter(k[-22], r1, r0, r3, 86, -14);
399 keyiter(k[-21], r2, r1, r4, 87, -13);
400 keyiter(k[-20], r3, r2, r0, 88, -12);
401 keyiter(k[-19], r4, r3, r1, 89, -11);
402 keyiter(k[-18], r0, r4, r2, 90, -10);
403 keyiter(k[-17], r1, r0, r3, 91, -9);
404 keyiter(k[-16], r2, r1, r4, 92, -8);
405 keyiter(k[-15], r3, r2, r0, 93, -7);
406 keyiter(k[-14], r4, r3, r1, 94, -6);
407 keyiter(k[-13], r0, r4, r2, 95, -5);
408 keyiter(k[-12], r1, r0, r3, 96, -4);
409 keyiter(k[-11], r2, r1, r4, 97, -3);
410 keyiter(k[-10], r3, r2, r0, 98, -2);
411 keyiter(k[-9], r4, r3, r1, 99, -1);
412 keyiter(k[-8], r0, r4, r2, 100, 0);
413 keyiter(k[-7], r1, r0, r3, 101, 1);
414 keyiter(k[-6], r2, r1, r4, 102, 2);
415 keyiter(k[-5], r3, r2, r0, 103, 3);
416 keyiter(k[-4], r4, r3, r1, 104, 4);
417 keyiter(k[-3], r0, r4, r2, 105, 5);
418 keyiter(k[-2], r1, r0, r3, 106, 6);
419 keyiter(k[-1], r2, r1, r4, 107, 7);
420 keyiter(k[0], r3, r2, r0, 108, 8);
421 keyiter(k[1], r4, r3, r1, 109, 9);
422 keyiter(k[2], r0, r4, r2, 110, 10);
423 keyiter(k[3], r1, r0, r3, 111, 11);
424 keyiter(k[4], r2, r1, r4, 112, 12);
425 keyiter(k[5], r3, r2, r0, 113, 13);
426 keyiter(k[6], r4, r3, r1, 114, 14);
427 keyiter(k[7], r0, r4, r2, 115, 15);
428 keyiter(k[8], r1, r0, r3, 116, 16);
429 keyiter(k[9], r2, r1, r4, 117, 17);
430 keyiter(k[10], r3, r2, r0, 118, 18);
431 keyiter(k[11], r4, r3, r1, 119, 19);
432 keyiter(k[12], r0, r4, r2, 120, 20);
433 keyiter(k[13], r1, r0, r3, 121, 21);
434 keyiter(k[14], r2, r1, r4, 122, 22);
435 keyiter(k[15], r3, r2, r0, 123, 23);
436 keyiter(k[16], r4, r3, r1, 124, 24);
437 keyiter(k[17], r0, r4, r2, 125, 25);
438 keyiter(k[18], r1, r0, r3, 126, 26);
439 keyiter(k[19], r2, r1, r4, 127, 27);
440 keyiter(k[20], r3, r2, r0, 128, 28);
441 keyiter(k[21], r4, r3, r1, 129, 29);
442 keyiter(k[22], r0, r4, r2, 130, 30);
443 keyiter(k[23], r1, r0, r3, 131, 31);
444
445 /* Apply S-boxes */
446 __serpent_setkey_sbox(r0, r1, r2, r3, r4, ctx->expkey);
447
448 return 0;
449}
450EXPORT_SYMBOL_GPL(__serpent_setkey);
451
452int serpent_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
453{
454 return __serpent_setkey(crypto_tfm_ctx(tfm), key, keylen);
455}
456EXPORT_SYMBOL_GPL(serpent_setkey);
457
458void __serpent_encrypt(const void *c, u8 *dst, const u8 *src)
459{
460 const struct serpent_ctx *ctx = c;
461 const u32 *k = ctx->expkey;
462 u32 r0, r1, r2, r3, r4;
463
464 r0 = get_unaligned_le32(src);
465 r1 = get_unaligned_le32(src + 4);
466 r2 = get_unaligned_le32(src + 8);
467 r3 = get_unaligned_le32(src + 12);
468
469 K(r0, r1, r2, r3, 0);
470 S0(r0, r1, r2, r3, r4); LK(r2, r1, r3, r0, r4, 1);
471 S1(r2, r1, r3, r0, r4); LK(r4, r3, r0, r2, r1, 2);
472 S2(r4, r3, r0, r2, r1); LK(r1, r3, r4, r2, r0, 3);
473 S3(r1, r3, r4, r2, r0); LK(r2, r0, r3, r1, r4, 4);
474 S4(r2, r0, r3, r1, r4); LK(r0, r3, r1, r4, r2, 5);
475 S5(r0, r3, r1, r4, r2); LK(r2, r0, r3, r4, r1, 6);
476 S6(r2, r0, r3, r4, r1); LK(r3, r1, r0, r4, r2, 7);
477 S7(r3, r1, r0, r4, r2); LK(r2, r0, r4, r3, r1, 8);
478 S0(r2, r0, r4, r3, r1); LK(r4, r0, r3, r2, r1, 9);
479 S1(r4, r0, r3, r2, r1); LK(r1, r3, r2, r4, r0, 10);
480 S2(r1, r3, r2, r4, r0); LK(r0, r3, r1, r4, r2, 11);
481 S3(r0, r3, r1, r4, r2); LK(r4, r2, r3, r0, r1, 12);
482 S4(r4, r2, r3, r0, r1); LK(r2, r3, r0, r1, r4, 13);
483 S5(r2, r3, r0, r1, r4); LK(r4, r2, r3, r1, r0, 14);
484 S6(r4, r2, r3, r1, r0); LK(r3, r0, r2, r1, r4, 15);
485 S7(r3, r0, r2, r1, r4); LK(r4, r2, r1, r3, r0, 16);
486 S0(r4, r2, r1, r3, r0); LK(r1, r2, r3, r4, r0, 17);
487 S1(r1, r2, r3, r4, r0); LK(r0, r3, r4, r1, r2, 18);
488 S2(r0, r3, r4, r1, r2); LK(r2, r3, r0, r1, r4, 19);
489 S3(r2, r3, r0, r1, r4); LK(r1, r4, r3, r2, r0, 20);
490 S4(r1, r4, r3, r2, r0); LK(r4, r3, r2, r0, r1, 21);
491 S5(r4, r3, r2, r0, r1); LK(r1, r4, r3, r0, r2, 22);
492 S6(r1, r4, r3, r0, r2); LK(r3, r2, r4, r0, r1, 23);
493 S7(r3, r2, r4, r0, r1); LK(r1, r4, r0, r3, r2, 24);
494 S0(r1, r4, r0, r3, r2); LK(r0, r4, r3, r1, r2, 25);
495 S1(r0, r4, r3, r1, r2); LK(r2, r3, r1, r0, r4, 26);
496 S2(r2, r3, r1, r0, r4); LK(r4, r3, r2, r0, r1, 27);
497 S3(r4, r3, r2, r0, r1); LK(r0, r1, r3, r4, r2, 28);
498 S4(r0, r1, r3, r4, r2); LK(r1, r3, r4, r2, r0, 29);
499 S5(r1, r3, r4, r2, r0); LK(r0, r1, r3, r2, r4, 30);
500 S6(r0, r1, r3, r2, r4); LK(r3, r4, r1, r2, r0, 31);
501 S7(r3, r4, r1, r2, r0); K(r0, r1, r2, r3, 32);
502
503 put_unaligned_le32(r0, dst);
504 put_unaligned_le32(r1, dst + 4);
505 put_unaligned_le32(r2, dst + 8);
506 put_unaligned_le32(r3, dst + 12);
507}
508EXPORT_SYMBOL_GPL(__serpent_encrypt);
509
510static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
511{
512 struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
513
514 __serpent_encrypt(ctx, dst, src);
515}
516
517void __serpent_decrypt(const void *c, u8 *dst, const u8 *src)
518{
519 const struct serpent_ctx *ctx = c;
520 const u32 *k = ctx->expkey;
521 u32 r0, r1, r2, r3, r4;
522
523 r0 = get_unaligned_le32(src);
524 r1 = get_unaligned_le32(src + 4);
525 r2 = get_unaligned_le32(src + 8);
526 r3 = get_unaligned_le32(src + 12);
527
528 K(r0, r1, r2, r3, 32);
529 SI7(r0, r1, r2, r3, r4); KL(r1, r3, r0, r4, r2, 31);
530 SI6(r1, r3, r0, r4, r2); KL(r0, r2, r4, r1, r3, 30);
531 SI5(r0, r2, r4, r1, r3); KL(r2, r3, r0, r4, r1, 29);
532 SI4(r2, r3, r0, r4, r1); KL(r2, r0, r1, r4, r3, 28);
533 SI3(r2, r0, r1, r4, r3); KL(r1, r2, r3, r4, r0, 27);
534 SI2(r1, r2, r3, r4, r0); KL(r2, r0, r4, r3, r1, 26);
535 SI1(r2, r0, r4, r3, r1); KL(r1, r0, r4, r3, r2, 25);
536 SI0(r1, r0, r4, r3, r2); KL(r4, r2, r0, r1, r3, 24);
537 SI7(r4, r2, r0, r1, r3); KL(r2, r1, r4, r3, r0, 23);
538 SI6(r2, r1, r4, r3, r0); KL(r4, r0, r3, r2, r1, 22);
539 SI5(r4, r0, r3, r2, r1); KL(r0, r1, r4, r3, r2, 21);
540 SI4(r0, r1, r4, r3, r2); KL(r0, r4, r2, r3, r1, 20);
541 SI3(r0, r4, r2, r3, r1); KL(r2, r0, r1, r3, r4, 19);
542 SI2(r2, r0, r1, r3, r4); KL(r0, r4, r3, r1, r2, 18);
543 SI1(r0, r4, r3, r1, r2); KL(r2, r4, r3, r1, r0, 17);
544 SI0(r2, r4, r3, r1, r0); KL(r3, r0, r4, r2, r1, 16);
545 SI7(r3, r0, r4, r2, r1); KL(r0, r2, r3, r1, r4, 15);
546 SI6(r0, r2, r3, r1, r4); KL(r3, r4, r1, r0, r2, 14);
547 SI5(r3, r4, r1, r0, r2); KL(r4, r2, r3, r1, r0, 13);
548 SI4(r4, r2, r3, r1, r0); KL(r4, r3, r0, r1, r2, 12);
549 SI3(r4, r3, r0, r1, r2); KL(r0, r4, r2, r1, r3, 11);
550 SI2(r0, r4, r2, r1, r3); KL(r4, r3, r1, r2, r0, 10);
551 SI1(r4, r3, r1, r2, r0); KL(r0, r3, r1, r2, r4, 9);
552 SI0(r0, r3, r1, r2, r4); KL(r1, r4, r3, r0, r2, 8);
553 SI7(r1, r4, r3, r0, r2); KL(r4, r0, r1, r2, r3, 7);
554 SI6(r4, r0, r1, r2, r3); KL(r1, r3, r2, r4, r0, 6);
555 SI5(r1, r3, r2, r4, r0); KL(r3, r0, r1, r2, r4, 5);
556 SI4(r3, r0, r1, r2, r4); KL(r3, r1, r4, r2, r0, 4);
557 SI3(r3, r1, r4, r2, r0); KL(r4, r3, r0, r2, r1, 3);
558 SI2(r4, r3, r0, r2, r1); KL(r3, r1, r2, r0, r4, 2);
559 SI1(r3, r1, r2, r0, r4); KL(r4, r1, r2, r0, r3, 1);
560 SI0(r4, r1, r2, r0, r3); K(r2, r3, r1, r4, 0);
561
562 put_unaligned_le32(r2, dst);
563 put_unaligned_le32(r3, dst + 4);
564 put_unaligned_le32(r1, dst + 8);
565 put_unaligned_le32(r4, dst + 12);
566}
567EXPORT_SYMBOL_GPL(__serpent_decrypt);
568
569static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
570{
571 struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
572
573 __serpent_decrypt(ctx, dst, src);
574}
575
576static struct crypto_alg srp_alg = {
577 .cra_name = "serpent",
578 .cra_driver_name = "serpent-generic",
579 .cra_priority = 100,
580 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
581 .cra_blocksize = SERPENT_BLOCK_SIZE,
582 .cra_ctxsize = sizeof(struct serpent_ctx),
583 .cra_module = THIS_MODULE,
584 .cra_u = { .cipher = {
585 .cia_min_keysize = SERPENT_MIN_KEY_SIZE,
586 .cia_max_keysize = SERPENT_MAX_KEY_SIZE,
587 .cia_setkey = serpent_setkey,
588 .cia_encrypt = serpent_encrypt,
589 .cia_decrypt = serpent_decrypt } }
590};
591
592static int __init serpent_mod_init(void)
593{
594 return crypto_register_alg(&srp_alg);
595}
596
597static void __exit serpent_mod_fini(void)
598{
599 crypto_unregister_alg(&srp_alg);
600}
601
602module_init(serpent_mod_init);
603module_exit(serpent_mod_fini);
604
605MODULE_LICENSE("GPL");
606MODULE_DESCRIPTION("Serpent Cipher Algorithm");
607MODULE_AUTHOR("Dag Arne Osvik <[email protected]>");
608MODULE_ALIAS_CRYPTO("serpent");
609MODULE_ALIAS_CRYPTO("serpent-generic");