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