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serpent_generic.c
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1 /*
2  * Cryptographic API.
3  *
4  * Serpent Cipher Algorithm.
5  *
6  * Copyright (C) 2002 Dag Arne Osvik <[email protected]>
7  * 2003 Herbert Valerio Riedel <[email protected]>
8  *
9  * Added tnepres support:
10  * Ruben Jesus Garcia Hernandez <[email protected]>, 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 
232 int __serpent_setkey(struct serpent_ctx *ctx, const u8 *key,
233  unsigned int keylen)
234 {
235  u32 *k = ctx->expkey;
236  u8 *k8 = (u8 *)k;
237  u32 r0, r1, r2, r3, r4;
238  int i;
239 
240  /* Copy key, add padding */
241 
242  for (i = 0; i < keylen; ++i)
243  k8[i] = key[i];
244  if (i < SERPENT_MAX_KEY_SIZE)
245  k8[i++] = 1;
246  while (i < SERPENT_MAX_KEY_SIZE)
247  k8[i++] = 0;
248 
249  /* Expand key using polynomial */
250 
251  r0 = le32_to_cpu(k[3]);
252  r1 = le32_to_cpu(k[4]);
253  r2 = le32_to_cpu(k[5]);
254  r3 = le32_to_cpu(k[6]);
255  r4 = le32_to_cpu(k[7]);
256 
257  keyiter(le32_to_cpu(k[0]), r0, r4, r2, 0, 0);
258  keyiter(le32_to_cpu(k[1]), r1, r0, r3, 1, 1);
259  keyiter(le32_to_cpu(k[2]), r2, r1, r4, 2, 2);
260  keyiter(le32_to_cpu(k[3]), r3, r2, r0, 3, 3);
261  keyiter(le32_to_cpu(k[4]), r4, r3, r1, 4, 4);
262  keyiter(le32_to_cpu(k[5]), r0, r4, r2, 5, 5);
263  keyiter(le32_to_cpu(k[6]), r1, r0, r3, 6, 6);
264  keyiter(le32_to_cpu(k[7]), r2, r1, r4, 7, 7);
265 
266  keyiter(k[0], r3, r2, r0, 8, 8);
267  keyiter(k[1], r4, r3, r1, 9, 9);
268  keyiter(k[2], r0, r4, r2, 10, 10);
269  keyiter(k[3], r1, r0, r3, 11, 11);
270  keyiter(k[4], r2, r1, r4, 12, 12);
271  keyiter(k[5], r3, r2, r0, 13, 13);
272  keyiter(k[6], r4, r3, r1, 14, 14);
273  keyiter(k[7], r0, r4, r2, 15, 15);
274  keyiter(k[8], r1, r0, r3, 16, 16);
275  keyiter(k[9], r2, r1, r4, 17, 17);
276  keyiter(k[10], r3, r2, r0, 18, 18);
277  keyiter(k[11], r4, r3, r1, 19, 19);
278  keyiter(k[12], r0, r4, r2, 20, 20);
279  keyiter(k[13], r1, r0, r3, 21, 21);
280  keyiter(k[14], r2, r1, r4, 22, 22);
281  keyiter(k[15], r3, r2, r0, 23, 23);
282  keyiter(k[16], r4, r3, r1, 24, 24);
283  keyiter(k[17], r0, r4, r2, 25, 25);
284  keyiter(k[18], r1, r0, r3, 26, 26);
285  keyiter(k[19], r2, r1, r4, 27, 27);
286  keyiter(k[20], r3, r2, r0, 28, 28);
287  keyiter(k[21], r4, r3, r1, 29, 29);
288  keyiter(k[22], r0, r4, r2, 30, 30);
289  keyiter(k[23], r1, r0, r3, 31, 31);
290 
291  k += 50;
292 
293  keyiter(k[-26], r2, r1, r4, 32, -18);
294  keyiter(k[-25], r3, r2, r0, 33, -17);
295  keyiter(k[-24], r4, r3, r1, 34, -16);
296  keyiter(k[-23], r0, r4, r2, 35, -15);
297  keyiter(k[-22], r1, r0, r3, 36, -14);
298  keyiter(k[-21], r2, r1, r4, 37, -13);
299  keyiter(k[-20], r3, r2, r0, 38, -12);
300  keyiter(k[-19], r4, r3, r1, 39, -11);
301  keyiter(k[-18], r0, r4, r2, 40, -10);
302  keyiter(k[-17], r1, r0, r3, 41, -9);
303  keyiter(k[-16], r2, r1, r4, 42, -8);
304  keyiter(k[-15], r3, r2, r0, 43, -7);
305  keyiter(k[-14], r4, r3, r1, 44, -6);
306  keyiter(k[-13], r0, r4, r2, 45, -5);
307  keyiter(k[-12], r1, r0, r3, 46, -4);
308  keyiter(k[-11], r2, r1, r4, 47, -3);
309  keyiter(k[-10], r3, r2, r0, 48, -2);
310  keyiter(k[-9], r4, r3, r1, 49, -1);
311  keyiter(k[-8], r0, r4, r2, 50, 0);
312  keyiter(k[-7], r1, r0, r3, 51, 1);
313  keyiter(k[-6], r2, r1, r4, 52, 2);
314  keyiter(k[-5], r3, r2, r0, 53, 3);
315  keyiter(k[-4], r4, r3, r1, 54, 4);
316  keyiter(k[-3], r0, r4, r2, 55, 5);
317  keyiter(k[-2], r1, r0, r3, 56, 6);
318  keyiter(k[-1], r2, r1, r4, 57, 7);
319  keyiter(k[0], r3, r2, r0, 58, 8);
320  keyiter(k[1], r4, r3, r1, 59, 9);
321  keyiter(k[2], r0, r4, r2, 60, 10);
322  keyiter(k[3], r1, r0, r3, 61, 11);
323  keyiter(k[4], r2, r1, r4, 62, 12);
324  keyiter(k[5], r3, r2, r0, 63, 13);
325  keyiter(k[6], r4, r3, r1, 64, 14);
326  keyiter(k[7], r0, r4, r2, 65, 15);
327  keyiter(k[8], r1, r0, r3, 66, 16);
328  keyiter(k[9], r2, r1, r4, 67, 17);
329  keyiter(k[10], r3, r2, r0, 68, 18);
330  keyiter(k[11], r4, r3, r1, 69, 19);
331  keyiter(k[12], r0, r4, r2, 70, 20);
332  keyiter(k[13], r1, r0, r3, 71, 21);
333  keyiter(k[14], r2, r1, r4, 72, 22);
334  keyiter(k[15], r3, r2, r0, 73, 23);
335  keyiter(k[16], r4, r3, r1, 74, 24);
336  keyiter(k[17], r0, r4, r2, 75, 25);
337  keyiter(k[18], r1, r0, r3, 76, 26);
338  keyiter(k[19], r2, r1, r4, 77, 27);
339  keyiter(k[20], r3, r2, r0, 78, 28);
340  keyiter(k[21], r4, r3, r1, 79, 29);
341  keyiter(k[22], r0, r4, r2, 80, 30);
342  keyiter(k[23], r1, r0, r3, 81, 31);
343 
344  k += 50;
345 
346  keyiter(k[-26], r2, r1, r4, 82, -18);
347  keyiter(k[-25], r3, r2, r0, 83, -17);
348  keyiter(k[-24], r4, r3, r1, 84, -16);
349  keyiter(k[-23], r0, r4, r2, 85, -15);
350  keyiter(k[-22], r1, r0, r3, 86, -14);
351  keyiter(k[-21], r2, r1, r4, 87, -13);
352  keyiter(k[-20], r3, r2, r0, 88, -12);
353  keyiter(k[-19], r4, r3, r1, 89, -11);
354  keyiter(k[-18], r0, r4, r2, 90, -10);
355  keyiter(k[-17], r1, r0, r3, 91, -9);
356  keyiter(k[-16], r2, r1, r4, 92, -8);
357  keyiter(k[-15], r3, r2, r0, 93, -7);
358  keyiter(k[-14], r4, r3, r1, 94, -6);
359  keyiter(k[-13], r0, r4, r2, 95, -5);
360  keyiter(k[-12], r1, r0, r3, 96, -4);
361  keyiter(k[-11], r2, r1, r4, 97, -3);
362  keyiter(k[-10], r3, r2, r0, 98, -2);
363  keyiter(k[-9], r4, r3, r1, 99, -1);
364  keyiter(k[-8], r0, r4, r2, 100, 0);
365  keyiter(k[-7], r1, r0, r3, 101, 1);
366  keyiter(k[-6], r2, r1, r4, 102, 2);
367  keyiter(k[-5], r3, r2, r0, 103, 3);
368  keyiter(k[-4], r4, r3, r1, 104, 4);
369  keyiter(k[-3], r0, r4, r2, 105, 5);
370  keyiter(k[-2], r1, r0, r3, 106, 6);
371  keyiter(k[-1], r2, r1, r4, 107, 7);
372  keyiter(k[0], r3, r2, r0, 108, 8);
373  keyiter(k[1], r4, r3, r1, 109, 9);
374  keyiter(k[2], r0, r4, r2, 110, 10);
375  keyiter(k[3], r1, r0, r3, 111, 11);
376  keyiter(k[4], r2, r1, r4, 112, 12);
377  keyiter(k[5], r3, r2, r0, 113, 13);
378  keyiter(k[6], r4, r3, r1, 114, 14);
379  keyiter(k[7], r0, r4, r2, 115, 15);
380  keyiter(k[8], r1, r0, r3, 116, 16);
381  keyiter(k[9], r2, r1, r4, 117, 17);
382  keyiter(k[10], r3, r2, r0, 118, 18);
383  keyiter(k[11], r4, r3, r1, 119, 19);
384  keyiter(k[12], r0, r4, r2, 120, 20);
385  keyiter(k[13], r1, r0, r3, 121, 21);
386  keyiter(k[14], r2, r1, r4, 122, 22);
387  keyiter(k[15], r3, r2, r0, 123, 23);
388  keyiter(k[16], r4, r3, r1, 124, 24);
389  keyiter(k[17], r0, r4, r2, 125, 25);
390  keyiter(k[18], r1, r0, r3, 126, 26);
391  keyiter(k[19], r2, r1, r4, 127, 27);
392  keyiter(k[20], r3, r2, r0, 128, 28);
393  keyiter(k[21], r4, r3, r1, 129, 29);
394  keyiter(k[22], r0, r4, r2, 130, 30);
395  keyiter(k[23], r1, r0, r3, 131, 31);
396 
397  /* Apply S-boxes */
398 
399  S3(r3, r4, r0, r1, r2); store_and_load_keys(r1, r2, r4, r3, 28, 24);
400  S4(r1, r2, r4, r3, r0); store_and_load_keys(r2, r4, r3, r0, 24, 20);
401  S5(r2, r4, r3, r0, r1); store_and_load_keys(r1, r2, r4, r0, 20, 16);
402  S6(r1, r2, r4, r0, r3); store_and_load_keys(r4, r3, r2, r0, 16, 12);
403  S7(r4, r3, r2, r0, r1); store_and_load_keys(r1, r2, r0, r4, 12, 8);
404  S0(r1, r2, r0, r4, r3); store_and_load_keys(r0, r2, r4, r1, 8, 4);
405  S1(r0, r2, r4, r1, r3); store_and_load_keys(r3, r4, r1, r0, 4, 0);
406  S2(r3, r4, r1, r0, r2); store_and_load_keys(r2, r4, r3, r0, 0, -4);
407  S3(r2, r4, r3, r0, r1); store_and_load_keys(r0, r1, r4, r2, -4, -8);
408  S4(r0, r1, r4, r2, r3); store_and_load_keys(r1, r4, r2, r3, -8, -12);
409  S5(r1, r4, r2, r3, r0); store_and_load_keys(r0, r1, r4, r3, -12, -16);
410  S6(r0, r1, r4, r3, r2); store_and_load_keys(r4, r2, r1, r3, -16, -20);
411  S7(r4, r2, r1, r3, r0); store_and_load_keys(r0, r1, r3, r4, -20, -24);
412  S0(r0, r1, r3, r4, r2); store_and_load_keys(r3, r1, r4, r0, -24, -28);
413  k -= 50;
414  S1(r3, r1, r4, r0, r2); store_and_load_keys(r2, r4, r0, r3, 22, 18);
415  S2(r2, r4, r0, r3, r1); store_and_load_keys(r1, r4, r2, r3, 18, 14);
416  S3(r1, r4, r2, r3, r0); store_and_load_keys(r3, r0, r4, r1, 14, 10);
417  S4(r3, r0, r4, r1, r2); store_and_load_keys(r0, r4, r1, r2, 10, 6);
418  S5(r0, r4, r1, r2, r3); store_and_load_keys(r3, r0, r4, r2, 6, 2);
419  S6(r3, r0, r4, r2, r1); store_and_load_keys(r4, r1, r0, r2, 2, -2);
420  S7(r4, r1, r0, r2, r3); store_and_load_keys(r3, r0, r2, r4, -2, -6);
421  S0(r3, r0, r2, r4, r1); store_and_load_keys(r2, r0, r4, r3, -6, -10);
422  S1(r2, r0, r4, r3, r1); store_and_load_keys(r1, r4, r3, r2, -10, -14);
423  S2(r1, r4, r3, r2, r0); store_and_load_keys(r0, r4, r1, r2, -14, -18);
424  S3(r0, r4, r1, r2, r3); store_and_load_keys(r2, r3, r4, r0, -18, -22);
425  k -= 50;
426  S4(r2, r3, r4, r0, r1); store_and_load_keys(r3, r4, r0, r1, 28, 24);
427  S5(r3, r4, r0, r1, r2); store_and_load_keys(r2, r3, r4, r1, 24, 20);
428  S6(r2, r3, r4, r1, r0); store_and_load_keys(r4, r0, r3, r1, 20, 16);
429  S7(r4, r0, r3, r1, r2); store_and_load_keys(r2, r3, r1, r4, 16, 12);
430  S0(r2, r3, r1, r4, r0); store_and_load_keys(r1, r3, r4, r2, 12, 8);
431  S1(r1, r3, r4, r2, r0); store_and_load_keys(r0, r4, r2, r1, 8, 4);
432  S2(r0, r4, r2, r1, r3); store_and_load_keys(r3, r4, r0, r1, 4, 0);
433  S3(r3, r4, r0, r1, r2); storekeys(r1, r2, r4, r3, 0);
434 
435  return 0;
436 }
437 EXPORT_SYMBOL_GPL(__serpent_setkey);
438 
439 int serpent_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
440 {
441  return __serpent_setkey(crypto_tfm_ctx(tfm), key, keylen);
442 }
443 EXPORT_SYMBOL_GPL(serpent_setkey);
444 
445 void __serpent_encrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src)
446 {
447  const u32 *k = ctx->expkey;
448  const __le32 *s = (const __le32 *)src;
449  __le32 *d = (__le32 *)dst;
450  u32 r0, r1, r2, r3, r4;
451 
452 /*
453  * Note: The conversions between u8* and u32* might cause trouble
454  * on architectures with stricter alignment rules than x86
455  */
456 
457  r0 = le32_to_cpu(s[0]);
458  r1 = le32_to_cpu(s[1]);
459  r2 = le32_to_cpu(s[2]);
460  r3 = le32_to_cpu(s[3]);
461 
462  K(r0, r1, r2, r3, 0);
463  S0(r0, r1, r2, r3, r4); LK(r2, r1, r3, r0, r4, 1);
464  S1(r2, r1, r3, r0, r4); LK(r4, r3, r0, r2, r1, 2);
465  S2(r4, r3, r0, r2, r1); LK(r1, r3, r4, r2, r0, 3);
466  S3(r1, r3, r4, r2, r0); LK(r2, r0, r3, r1, r4, 4);
467  S4(r2, r0, r3, r1, r4); LK(r0, r3, r1, r4, r2, 5);
468  S5(r0, r3, r1, r4, r2); LK(r2, r0, r3, r4, r1, 6);
469  S6(r2, r0, r3, r4, r1); LK(r3, r1, r0, r4, r2, 7);
470  S7(r3, r1, r0, r4, r2); LK(r2, r0, r4, r3, r1, 8);
471  S0(r2, r0, r4, r3, r1); LK(r4, r0, r3, r2, r1, 9);
472  S1(r4, r0, r3, r2, r1); LK(r1, r3, r2, r4, r0, 10);
473  S2(r1, r3, r2, r4, r0); LK(r0, r3, r1, r4, r2, 11);
474  S3(r0, r3, r1, r4, r2); LK(r4, r2, r3, r0, r1, 12);
475  S4(r4, r2, r3, r0, r1); LK(r2, r3, r0, r1, r4, 13);
476  S5(r2, r3, r0, r1, r4); LK(r4, r2, r3, r1, r0, 14);
477  S6(r4, r2, r3, r1, r0); LK(r3, r0, r2, r1, r4, 15);
478  S7(r3, r0, r2, r1, r4); LK(r4, r2, r1, r3, r0, 16);
479  S0(r4, r2, r1, r3, r0); LK(r1, r2, r3, r4, r0, 17);
480  S1(r1, r2, r3, r4, r0); LK(r0, r3, r4, r1, r2, 18);
481  S2(r0, r3, r4, r1, r2); LK(r2, r3, r0, r1, r4, 19);
482  S3(r2, r3, r0, r1, r4); LK(r1, r4, r3, r2, r0, 20);
483  S4(r1, r4, r3, r2, r0); LK(r4, r3, r2, r0, r1, 21);
484  S5(r4, r3, r2, r0, r1); LK(r1, r4, r3, r0, r2, 22);
485  S6(r1, r4, r3, r0, r2); LK(r3, r2, r4, r0, r1, 23);
486  S7(r3, r2, r4, r0, r1); LK(r1, r4, r0, r3, r2, 24);
487  S0(r1, r4, r0, r3, r2); LK(r0, r4, r3, r1, r2, 25);
488  S1(r0, r4, r3, r1, r2); LK(r2, r3, r1, r0, r4, 26);
489  S2(r2, r3, r1, r0, r4); LK(r4, r3, r2, r0, r1, 27);
490  S3(r4, r3, r2, r0, r1); LK(r0, r1, r3, r4, r2, 28);
491  S4(r0, r1, r3, r4, r2); LK(r1, r3, r4, r2, r0, 29);
492  S5(r1, r3, r4, r2, r0); LK(r0, r1, r3, r2, r4, 30);
493  S6(r0, r1, r3, r2, r4); LK(r3, r4, r1, r2, r0, 31);
494  S7(r3, r4, r1, r2, r0); K(r0, r1, r2, r3, 32);
495 
496  d[0] = cpu_to_le32(r0);
497  d[1] = cpu_to_le32(r1);
498  d[2] = cpu_to_le32(r2);
499  d[3] = cpu_to_le32(r3);
500 }
501 EXPORT_SYMBOL_GPL(__serpent_encrypt);
502 
503 static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
504 {
505  struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
506 
507  __serpent_encrypt(ctx, dst, src);
508 }
509 
510 void __serpent_decrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src)
511 {
512  const u32 *k = ctx->expkey;
513  const __le32 *s = (const __le32 *)src;
514  __le32 *d = (__le32 *)dst;
515  u32 r0, r1, r2, r3, r4;
516 
517  r0 = le32_to_cpu(s[0]);
518  r1 = le32_to_cpu(s[1]);
519  r2 = le32_to_cpu(s[2]);
520  r3 = le32_to_cpu(s[3]);
521 
522  K(r0, r1, r2, r3, 32);
523  SI7(r0, r1, r2, r3, r4); KL(r1, r3, r0, r4, r2, 31);
524  SI6(r1, r3, r0, r4, r2); KL(r0, r2, r4, r1, r3, 30);
525  SI5(r0, r2, r4, r1, r3); KL(r2, r3, r0, r4, r1, 29);
526  SI4(r2, r3, r0, r4, r1); KL(r2, r0, r1, r4, r3, 28);
527  SI3(r2, r0, r1, r4, r3); KL(r1, r2, r3, r4, r0, 27);
528  SI2(r1, r2, r3, r4, r0); KL(r2, r0, r4, r3, r1, 26);
529  SI1(r2, r0, r4, r3, r1); KL(r1, r0, r4, r3, r2, 25);
530  SI0(r1, r0, r4, r3, r2); KL(r4, r2, r0, r1, r3, 24);
531  SI7(r4, r2, r0, r1, r3); KL(r2, r1, r4, r3, r0, 23);
532  SI6(r2, r1, r4, r3, r0); KL(r4, r0, r3, r2, r1, 22);
533  SI5(r4, r0, r3, r2, r1); KL(r0, r1, r4, r3, r2, 21);
534  SI4(r0, r1, r4, r3, r2); KL(r0, r4, r2, r3, r1, 20);
535  SI3(r0, r4, r2, r3, r1); KL(r2, r0, r1, r3, r4, 19);
536  SI2(r2, r0, r1, r3, r4); KL(r0, r4, r3, r1, r2, 18);
537  SI1(r0, r4, r3, r1, r2); KL(r2, r4, r3, r1, r0, 17);
538  SI0(r2, r4, r3, r1, r0); KL(r3, r0, r4, r2, r1, 16);
539  SI7(r3, r0, r4, r2, r1); KL(r0, r2, r3, r1, r4, 15);
540  SI6(r0, r2, r3, r1, r4); KL(r3, r4, r1, r0, r2, 14);
541  SI5(r3, r4, r1, r0, r2); KL(r4, r2, r3, r1, r0, 13);
542  SI4(r4, r2, r3, r1, r0); KL(r4, r3, r0, r1, r2, 12);
543  SI3(r4, r3, r0, r1, r2); KL(r0, r4, r2, r1, r3, 11);
544  SI2(r0, r4, r2, r1, r3); KL(r4, r3, r1, r2, r0, 10);
545  SI1(r4, r3, r1, r2, r0); KL(r0, r3, r1, r2, r4, 9);
546  SI0(r0, r3, r1, r2, r4); KL(r1, r4, r3, r0, r2, 8);
547  SI7(r1, r4, r3, r0, r2); KL(r4, r0, r1, r2, r3, 7);
548  SI6(r4, r0, r1, r2, r3); KL(r1, r3, r2, r4, r0, 6);
549  SI5(r1, r3, r2, r4, r0); KL(r3, r0, r1, r2, r4, 5);
550  SI4(r3, r0, r1, r2, r4); KL(r3, r1, r4, r2, r0, 4);
551  SI3(r3, r1, r4, r2, r0); KL(r4, r3, r0, r2, r1, 3);
552  SI2(r4, r3, r0, r2, r1); KL(r3, r1, r2, r0, r4, 2);
553  SI1(r3, r1, r2, r0, r4); KL(r4, r1, r2, r0, r3, 1);
554  SI0(r4, r1, r2, r0, r3); K(r2, r3, r1, r4, 0);
555 
556  d[0] = cpu_to_le32(r2);
557  d[1] = cpu_to_le32(r3);
558  d[2] = cpu_to_le32(r1);
559  d[3] = cpu_to_le32(r4);
560 }
561 EXPORT_SYMBOL_GPL(__serpent_decrypt);
562 
563 static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
564 {
565  struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
566 
567  __serpent_decrypt(ctx, dst, src);
568 }
569 
570 static int tnepres_setkey(struct crypto_tfm *tfm, const u8 *key,
571  unsigned int keylen)
572 {
573  u8 rev_key[SERPENT_MAX_KEY_SIZE];
574  int i;
575 
576  for (i = 0; i < keylen; ++i)
577  rev_key[keylen - i - 1] = key[i];
578 
579  return serpent_setkey(tfm, rev_key, keylen);
580 }
581 
582 static void tnepres_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
583 {
584  const u32 * const s = (const u32 * const)src;
585  u32 * const d = (u32 * const)dst;
586 
587  u32 rs[4], rd[4];
588 
589  rs[0] = swab32(s[3]);
590  rs[1] = swab32(s[2]);
591  rs[2] = swab32(s[1]);
592  rs[3] = swab32(s[0]);
593 
594  serpent_encrypt(tfm, (u8 *)rd, (u8 *)rs);
595 
596  d[0] = swab32(rd[3]);
597  d[1] = swab32(rd[2]);
598  d[2] = swab32(rd[1]);
599  d[3] = swab32(rd[0]);
600 }
601 
602 static void tnepres_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
603 {
604  const u32 * const s = (const u32 * const)src;
605  u32 * const d = (u32 * const)dst;
606 
607  u32 rs[4], rd[4];
608 
609  rs[0] = swab32(s[3]);
610  rs[1] = swab32(s[2]);
611  rs[2] = swab32(s[1]);
612  rs[3] = swab32(s[0]);
613 
614  serpent_decrypt(tfm, (u8 *)rd, (u8 *)rs);
615 
616  d[0] = swab32(rd[3]);
617  d[1] = swab32(rd[2]);
618  d[2] = swab32(rd[1]);
619  d[3] = swab32(rd[0]);
620 }
621 
622 static struct crypto_alg srp_algs[2] = { {
623  .cra_name = "serpent",
624  .cra_driver_name = "serpent-generic",
625  .cra_priority = 100,
626  .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
627  .cra_blocksize = SERPENT_BLOCK_SIZE,
628  .cra_ctxsize = sizeof(struct serpent_ctx),
629  .cra_alignmask = 3,
630  .cra_module = THIS_MODULE,
631  .cra_u = { .cipher = {
632  .cia_min_keysize = SERPENT_MIN_KEY_SIZE,
633  .cia_max_keysize = SERPENT_MAX_KEY_SIZE,
634  .cia_setkey = serpent_setkey,
635  .cia_encrypt = serpent_encrypt,
636  .cia_decrypt = serpent_decrypt } }
637 }, {
638  .cra_name = "tnepres",
639  .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
640  .cra_blocksize = SERPENT_BLOCK_SIZE,
641  .cra_ctxsize = sizeof(struct serpent_ctx),
642  .cra_alignmask = 3,
643  .cra_module = THIS_MODULE,
644  .cra_u = { .cipher = {
645  .cia_min_keysize = SERPENT_MIN_KEY_SIZE,
646  .cia_max_keysize = SERPENT_MAX_KEY_SIZE,
647  .cia_setkey = tnepres_setkey,
648  .cia_encrypt = tnepres_encrypt,
649  .cia_decrypt = tnepres_decrypt } }
650 } };
651 
652 static int __init serpent_mod_init(void)
653 {
654  return crypto_register_algs(srp_algs, ARRAY_SIZE(srp_algs));
655 }
656 
657 static void __exit serpent_mod_fini(void)
658 {
659  crypto_unregister_algs(srp_algs, ARRAY_SIZE(srp_algs));
660 }
661 
662 module_init(serpent_mod_init);
663 module_exit(serpent_mod_fini);
664 
665 MODULE_LICENSE("GPL");
666 MODULE_DESCRIPTION("Serpent and tnepres (kerneli compatible serpent reversed) Cipher Algorithm");
667 MODULE_AUTHOR("Dag Arne Osvik <[email protected]>");
668 MODULE_ALIAS("tnepres");
669 MODULE_ALIAS("serpent");
Generated on Thu Jan 10 2013 13:23:08 for Linux Kernel by   doxygen 1.8.2