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 <osvik@ii.uib.no>
8 * 2003 Herbert Valerio Riedel <hvr@gnu.org>
9 *
10 * Added tnepres support:
11 * Ruben Jesus Garcia Hernandez <ruben@ugr.es>, 18.10.2004
12 * Based on code by hvr
13 */
14
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/errno.h>
18 #include <asm/byteorder.h>
19 #include <linux/crypto.h>
20 #include <linux/types.h>
21 #include <crypto/serpent.h>
22
23 /* Key is padded to the maximum of 256 bits before round key generation.
24 * Any key length <= 256 bits (32 bytes) is allowed by the algorithm.
25 */
26
27 #define PHI 0x9e3779b9UL
28
29 #define keyiter(a, b, c, d, i, j) \
30 ({ b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; b = rol32(b, 11); k[j] = b; })
31
32 #define loadkeys(x0, x1, x2, x3, i) \
33 ({ x0 = k[i]; x1 = k[i+1]; x2 = k[i+2]; x3 = k[i+3]; })
34
35 #define storekeys(x0, x1, x2, x3, i) \
36 ({ k[i] = x0; k[i+1] = x1; k[i+2] = x2; k[i+3] = x3; })
37
38 #define store_and_load_keys(x0, x1, x2, x3, s, l) \
39 ({ storekeys(x0, x1, x2, x3, s); loadkeys(x0, x1, x2, x3, l); })
40
41 #define K(x0, x1, x2, x3, i) ({ \
42 x3 ^= k[4*(i)+3]; x2 ^= k[4*(i)+2]; \
43 x1 ^= k[4*(i)+1]; x0 ^= k[4*(i)+0]; \
44 })
45
46 #define LK(x0, x1, x2, x3, x4, i) ({ \
47 x0 = rol32(x0, 13);\
48 x2 = rol32(x2, 3); x1 ^= x0; x4 = x0 << 3; \
49 x3 ^= x2; x1 ^= x2; \
50 x1 = rol32(x1, 1); x3 ^= x4; \
51 x3 = rol32(x3, 7); x4 = x1; \
52 x0 ^= x1; x4 <<= 7; x2 ^= x3; \
53 x0 ^= x3; x2 ^= x4; x3 ^= k[4*i+3]; \
54 x1 ^= k[4*i+1]; x0 = rol32(x0, 5); x2 = rol32(x2, 22);\
55 x0 ^= k[4*i+0]; x2 ^= k[4*i+2]; \
56 })
57
58 #define KL(x0, x1, x2, x3, x4, i) ({ \
59 x0 ^= k[4*i+0]; x1 ^= k[4*i+1]; x2 ^= k[4*i+2]; \
60 x3 ^= k[4*i+3]; x0 = ror32(x0, 5); x2 = ror32(x2, 22);\
61 x4 = x1; x2 ^= x3; x0 ^= x3; \
62 x4 <<= 7; x0 ^= x1; x1 = ror32(x1, 1); \
63 x2 ^= x4; x3 = ror32(x3, 7); x4 = x0 << 3; \
64 x1 ^= x0; x3 ^= x4; x0 = ror32(x0, 13);\
65 x1 ^= x2; x3 ^= x2; x2 = ror32(x2, 3); \
66 })
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
78 #define S1(x0, x1, x2, x3, x4) ({ \
79 x4 = x1; \
80 x1 ^= x0; x0 ^= x3; x3 = ~x3; \
81 x4 &= x1; x0 |= x1; x3 ^= x2; \
82 x0 ^= x3; x1 ^= x3; x3 ^= x4; \
83 x1 |= x4; x4 ^= x2; x2 &= x0; \
84 x2 ^= x1; x1 |= x0; x0 = ~x0; \
85 x0 ^= x2; x4 ^= x1; \
86 })
87
88 #define S2(x0, x1, x2, x3, x4) ({ \
89 x3 = ~x3; \
90 x1 ^= x0; x4 = x0; x0 &= x2; \
91 x0 ^= x3; x3 |= x4; x2 ^= x1; \
92 x3 ^= x1; x1 &= x0; x0 ^= x2; \
93 x2 &= x3; x3 |= x1; x0 = ~x0; \
94 x3 ^= x0; x4 ^= x0; x0 ^= x2; \
95 x1 |= x2; \
96 })
97
98 #define S3(x0, x1, x2, x3, x4) ({ \
99 x4 = x1; \
100 x1 ^= x3; x3 |= x0; x4 &= x0; \
101 x0 ^= x2; x2 ^= x1; x1 &= x3; \
102 x2 ^= x3; x0 |= x4; x4 ^= x3; \
103 x1 ^= x0; x0 &= x3; x3 &= x4; \
104 x3 ^= x2; x4 |= x1; x2 &= x1; \
105 x4 ^= x3; x0 ^= x3; x3 ^= x2; \
106 })
107
108 #define S4(x0, x1, x2, x3, x4) ({ \
109 x4 = x3; \
110 x3 &= x0; x0 ^= x4; \
111 x3 ^= x2; x2 |= x4; x0 ^= x1; \
112 x4 ^= x3; x2 |= x0; \
113 x2 ^= x1; x1 &= x0; \
114 x1 ^= x4; x4 &= x2; x2 ^= x3; \
115 x4 ^= x0; x3 |= x1; x1 = ~x1; \
116 x3 ^= x0; \
117 })
118
119 #define S5(x0, x1, x2, x3, x4) ({ \
120 x4 = x1; x1 |= x0; \
121 x2 ^= x1; x3 = ~x3; x4 ^= x0; \
122 x0 ^= x2; x1 &= x4; x4 |= x3; \
123 x4 ^= x0; x0 &= x3; x1 ^= x3; \
124 x3 ^= x2; x0 ^= x1; x2 &= x4; \
125 x1 ^= x2; x2 &= x0; \
126 x3 ^= x2; \
127 })
128
129 #define S6(x0, x1, x2, x3, x4) ({ \
130 x4 = x1; \
131 x3 ^= x0; x1 ^= x2; x2 ^= x0; \
132 x0 &= x3; x1 |= x3; x4 = ~x4; \
133 x0 ^= x1; x1 ^= x2; \
134 x3 ^= x4; x4 ^= x0; x2 &= x0; \
135 x4 ^= x1; x2 ^= x3; x3 &= x1; \
136 x3 ^= x0; x1 ^= x2; \
137 })
138
139 #define S7(x0, x1, x2, x3, x4) ({ \
140 x1 = ~x1; \
141 x4 = x1; x0 = ~x0; x1 &= x2; \
142 x1 ^= x3; x3 |= x4; x4 ^= x2; \
143 x2 ^= x3; x3 ^= x0; x0 |= x1; \
144 x2 &= x0; x0 ^= x4; x4 ^= x3; \
145 x3 &= x0; x4 ^= x1; \
146 x2 ^= x4; x3 ^= x1; x4 |= x0; \
147 x4 ^= x1; \
148 })
149
150 #define SI0(x0, x1, x2, x3, x4) ({ \
151 x4 = x3; x1 ^= x0; \
152 x3 |= x1; x4 ^= x1; x0 = ~x0; \
153 x2 ^= x3; x3 ^= x0; x0 &= x1; \
154 x0 ^= x2; x2 &= x3; x3 ^= x4; \
155 x2 ^= x3; x1 ^= x3; x3 &= x0; \
156 x1 ^= x0; x0 ^= x2; x4 ^= x3; \
157 })
158
159 #define SI1(x0, x1, x2, x3, x4) ({ \
160 x1 ^= x3; x4 = x0; \
161 x0 ^= x2; x2 = ~x2; x4 |= x1; \
162 x4 ^= x3; x3 &= x1; x1 ^= x2; \
163 x2 &= x4; x4 ^= x1; x1 |= x3; \
164 x3 ^= x0; x2 ^= x0; x0 |= x4; \
165 x2 ^= x4; x1 ^= x0; \
166 x4 ^= x1; \
167 })
168
169 #define SI2(x0, x1, x2, x3, x4) ({ \
170 x2 ^= x1; x4 = x3; x3 = ~x3; \
171 x3 |= x2; x2 ^= x4; x4 ^= x0; \
172 x3 ^= x1; x1 |= x2; x2 ^= x0; \
173 x1 ^= x4; x4 |= x3; x2 ^= x3; \
174 x4 ^= x2; x2 &= x1; \
175 x2 ^= x3; x3 ^= x4; x4 ^= x0; \
176 })
177
178 #define SI3(x0, x1, x2, x3, x4) ({ \
179 x2 ^= x1; \
180 x4 = x1; x1 &= x2; \
181 x1 ^= x0; x0 |= x4; x4 ^= x3; \
182 x0 ^= x3; x3 |= x1; x1 ^= x2; \
183 x1 ^= x3; x0 ^= x2; x2 ^= x3; \
184 x3 &= x1; x1 ^= x0; x0 &= x2; \
185 x4 ^= x3; x3 ^= x0; x0 ^= x1; \
186 })
187
188 #define SI4(x0, x1, x2, x3, x4) ({ \
189 x2 ^= x3; x4 = x0; x0 &= x1; \
190 x0 ^= x2; x2 |= x3; x4 = ~x4; \
191 x1 ^= x0; x0 ^= x2; x2 &= x4; \
192 x2 ^= x0; x0 |= x4; \
193 x0 ^= x3; x3 &= x2; \
194 x4 ^= x3; x3 ^= x1; x1 &= x0; \
195 x4 ^= x1; x0 ^= x3; \
196 })
197
198 #define SI5(x0, x1, x2, x3, x4) ({ \
199 x4 = x1; x1 |= x2; \
200 x2 ^= x4; x1 ^= x3; x3 &= x4; \
201 x2 ^= x3; x3 |= x0; x0 = ~x0; \
202 x3 ^= x2; x2 |= x0; x4 ^= x1; \
203 x2 ^= x4; x4 &= x0; x0 ^= x1; \
204 x1 ^= x3; x0 &= x2; x2 ^= x3; \
205 x0 ^= x2; x2 ^= x4; x4 ^= x3; \
206 })
207
208 #define SI6(x0, x1, x2, x3, x4) ({ \
209 x0 ^= x2; \
210 x4 = x0; x0 &= x3; x2 ^= x3; \
211 x0 ^= x2; x3 ^= x1; x2 |= x4; \
212 x2 ^= x3; x3 &= x0; x0 = ~x0; \
213 x3 ^= x1; x1 &= x2; x4 ^= x0; \
214 x3 ^= x4; x4 ^= x2; x0 ^= x1; \
215 x2 ^= x0; \
216 })
217
218 #define SI7(x0, x1, x2, x3, x4) ({ \
219 x4 = x3; x3 &= x0; x0 ^= x2; \
220 x2 |= x4; x4 ^= x1; x0 = ~x0; \
221 x1 |= x3; x4 ^= x0; x0 &= x2; \
222 x0 ^= x1; x1 &= x2; x3 ^= x2; \
223 x4 ^= x3; x2 &= x3; x3 |= x0; \
224 x1 ^= x4; x3 ^= x4; x4 &= x0; \
225 x4 ^= x2; \
226 })
227
228 /*
229 * both gcc and clang have misoptimized this function in the past,
230 * producing horrible object code from spilling temporary variables
231 * on the stack. Forcing this part out of line avoids that.
232 */
__serpent_setkey_sbox(u32 r0,u32 r1,u32 r2,u32 r3,u32 r4,u32 * k)233 static noinline void __serpent_setkey_sbox(u32 r0, u32 r1, u32 r2,
234 u32 r3, u32 r4, u32 *k)
235 {
236 k += 100;
237 S3(r3, r4, r0, r1, r2); store_and_load_keys(r1, r2, r4, r3, 28, 24);
238 S4(r1, r2, r4, r3, r0); store_and_load_keys(r2, r4, r3, r0, 24, 20);
239 S5(r2, r4, r3, r0, r1); store_and_load_keys(r1, r2, r4, r0, 20, 16);
240 S6(r1, r2, r4, r0, r3); store_and_load_keys(r4, r3, r2, r0, 16, 12);
241 S7(r4, r3, r2, r0, r1); store_and_load_keys(r1, r2, r0, r4, 12, 8);
242 S0(r1, r2, r0, r4, r3); store_and_load_keys(r0, r2, r4, r1, 8, 4);
243 S1(r0, r2, r4, r1, r3); store_and_load_keys(r3, r4, r1, r0, 4, 0);
244 S2(r3, r4, r1, r0, r2); store_and_load_keys(r2, r4, r3, r0, 0, -4);
245 S3(r2, r4, r3, r0, r1); store_and_load_keys(r0, r1, r4, r2, -4, -8);
246 S4(r0, r1, r4, r2, r3); store_and_load_keys(r1, r4, r2, r3, -8, -12);
247 S5(r1, r4, r2, r3, r0); store_and_load_keys(r0, r1, r4, r3, -12, -16);
248 S6(r0, r1, r4, r3, r2); store_and_load_keys(r4, r2, r1, r3, -16, -20);
249 S7(r4, r2, r1, r3, r0); store_and_load_keys(r0, r1, r3, r4, -20, -24);
250 S0(r0, r1, r3, r4, r2); store_and_load_keys(r3, r1, r4, r0, -24, -28);
251 k -= 50;
252 S1(r3, r1, r4, r0, r2); store_and_load_keys(r2, r4, r0, r3, 22, 18);
253 S2(r2, r4, r0, r3, r1); store_and_load_keys(r1, r4, r2, r3, 18, 14);
254 S3(r1, r4, r2, r3, r0); store_and_load_keys(r3, r0, r4, r1, 14, 10);
255 S4(r3, r0, r4, r1, r2); store_and_load_keys(r0, r4, r1, r2, 10, 6);
256 S5(r0, r4, r1, r2, r3); store_and_load_keys(r3, r0, r4, r2, 6, 2);
257 S6(r3, r0, r4, r2, r1); store_and_load_keys(r4, r1, r0, r2, 2, -2);
258 S7(r4, r1, r0, r2, r3); store_and_load_keys(r3, r0, r2, r4, -2, -6);
259 S0(r3, r0, r2, r4, r1); store_and_load_keys(r2, r0, r4, r3, -6, -10);
260 S1(r2, r0, r4, r3, r1); store_and_load_keys(r1, r4, r3, r2, -10, -14);
261 S2(r1, r4, r3, r2, r0); store_and_load_keys(r0, r4, r1, r2, -14, -18);
262 S3(r0, r4, r1, r2, r3); store_and_load_keys(r2, r3, r4, r0, -18, -22);
263 k -= 50;
264 S4(r2, r3, r4, r0, r1); store_and_load_keys(r3, r4, r0, r1, 28, 24);
265 S5(r3, r4, r0, r1, r2); store_and_load_keys(r2, r3, r4, r1, 24, 20);
266 S6(r2, r3, r4, r1, r0); store_and_load_keys(r4, r0, r3, r1, 20, 16);
267 S7(r4, r0, r3, r1, r2); store_and_load_keys(r2, r3, r1, r4, 16, 12);
268 S0(r2, r3, r1, r4, r0); store_and_load_keys(r1, r3, r4, r2, 12, 8);
269 S1(r1, r3, r4, r2, r0); store_and_load_keys(r0, r4, r2, r1, 8, 4);
270 S2(r0, r4, r2, r1, r3); store_and_load_keys(r3, r4, r0, r1, 4, 0);
271 S3(r3, r4, r0, r1, r2); storekeys(r1, r2, r4, r3, 0);
272 }
273
__serpent_setkey(struct serpent_ctx * ctx,const u8 * key,unsigned int keylen)274 int __serpent_setkey(struct serpent_ctx *ctx, const u8 *key,
275 unsigned int keylen)
276 {
277 u32 *k = ctx->expkey;
278 u8 *k8 = (u8 *)k;
279 u32 r0, r1, r2, r3, r4;
280 int i;
281
282 /* Copy key, add padding */
283
284 for (i = 0; i < keylen; ++i)
285 k8[i] = key[i];
286 if (i < SERPENT_MAX_KEY_SIZE)
287 k8[i++] = 1;
288 while (i < SERPENT_MAX_KEY_SIZE)
289 k8[i++] = 0;
290
291 /* Expand key using polynomial */
292
293 r0 = le32_to_cpu(k[3]);
294 r1 = le32_to_cpu(k[4]);
295 r2 = le32_to_cpu(k[5]);
296 r3 = le32_to_cpu(k[6]);
297 r4 = le32_to_cpu(k[7]);
298
299 keyiter(le32_to_cpu(k[0]), r0, r4, r2, 0, 0);
300 keyiter(le32_to_cpu(k[1]), r1, r0, r3, 1, 1);
301 keyiter(le32_to_cpu(k[2]), r2, r1, r4, 2, 2);
302 keyiter(le32_to_cpu(k[3]), r3, r2, r0, 3, 3);
303 keyiter(le32_to_cpu(k[4]), r4, r3, r1, 4, 4);
304 keyiter(le32_to_cpu(k[5]), r0, r4, r2, 5, 5);
305 keyiter(le32_to_cpu(k[6]), r1, r0, r3, 6, 6);
306 keyiter(le32_to_cpu(k[7]), r2, r1, r4, 7, 7);
307
308 keyiter(k[0], r3, r2, r0, 8, 8);
309 keyiter(k[1], r4, r3, r1, 9, 9);
310 keyiter(k[2], r0, r4, r2, 10, 10);
311 keyiter(k[3], r1, r0, r3, 11, 11);
312 keyiter(k[4], r2, r1, r4, 12, 12);
313 keyiter(k[5], r3, r2, r0, 13, 13);
314 keyiter(k[6], r4, r3, r1, 14, 14);
315 keyiter(k[7], r0, r4, r2, 15, 15);
316 keyiter(k[8], r1, r0, r3, 16, 16);
317 keyiter(k[9], r2, r1, r4, 17, 17);
318 keyiter(k[10], r3, r2, r0, 18, 18);
319 keyiter(k[11], r4, r3, r1, 19, 19);
320 keyiter(k[12], r0, r4, r2, 20, 20);
321 keyiter(k[13], r1, r0, r3, 21, 21);
322 keyiter(k[14], r2, r1, r4, 22, 22);
323 keyiter(k[15], r3, r2, r0, 23, 23);
324 keyiter(k[16], r4, r3, r1, 24, 24);
325 keyiter(k[17], r0, r4, r2, 25, 25);
326 keyiter(k[18], r1, r0, r3, 26, 26);
327 keyiter(k[19], r2, r1, r4, 27, 27);
328 keyiter(k[20], r3, r2, r0, 28, 28);
329 keyiter(k[21], r4, r3, r1, 29, 29);
330 keyiter(k[22], r0, r4, r2, 30, 30);
331 keyiter(k[23], r1, r0, r3, 31, 31);
332
333 k += 50;
334
335 keyiter(k[-26], r2, r1, r4, 32, -18);
336 keyiter(k[-25], r3, r2, r0, 33, -17);
337 keyiter(k[-24], r4, r3, r1, 34, -16);
338 keyiter(k[-23], r0, r4, r2, 35, -15);
339 keyiter(k[-22], r1, r0, r3, 36, -14);
340 keyiter(k[-21], r2, r1, r4, 37, -13);
341 keyiter(k[-20], r3, r2, r0, 38, -12);
342 keyiter(k[-19], r4, r3, r1, 39, -11);
343 keyiter(k[-18], r0, r4, r2, 40, -10);
344 keyiter(k[-17], r1, r0, r3, 41, -9);
345 keyiter(k[-16], r2, r1, r4, 42, -8);
346 keyiter(k[-15], r3, r2, r0, 43, -7);
347 keyiter(k[-14], r4, r3, r1, 44, -6);
348 keyiter(k[-13], r0, r4, r2, 45, -5);
349 keyiter(k[-12], r1, r0, r3, 46, -4);
350 keyiter(k[-11], r2, r1, r4, 47, -3);
351 keyiter(k[-10], r3, r2, r0, 48, -2);
352 keyiter(k[-9], r4, r3, r1, 49, -1);
353 keyiter(k[-8], r0, r4, r2, 50, 0);
354 keyiter(k[-7], r1, r0, r3, 51, 1);
355 keyiter(k[-6], r2, r1, r4, 52, 2);
356 keyiter(k[-5], r3, r2, r0, 53, 3);
357 keyiter(k[-4], r4, r3, r1, 54, 4);
358 keyiter(k[-3], r0, r4, r2, 55, 5);
359 keyiter(k[-2], r1, r0, r3, 56, 6);
360 keyiter(k[-1], r2, r1, r4, 57, 7);
361 keyiter(k[0], r3, r2, r0, 58, 8);
362 keyiter(k[1], r4, r3, r1, 59, 9);
363 keyiter(k[2], r0, r4, r2, 60, 10);
364 keyiter(k[3], r1, r0, r3, 61, 11);
365 keyiter(k[4], r2, r1, r4, 62, 12);
366 keyiter(k[5], r3, r2, r0, 63, 13);
367 keyiter(k[6], r4, r3, r1, 64, 14);
368 keyiter(k[7], r0, r4, r2, 65, 15);
369 keyiter(k[8], r1, r0, r3, 66, 16);
370 keyiter(k[9], r2, r1, r4, 67, 17);
371 keyiter(k[10], r3, r2, r0, 68, 18);
372 keyiter(k[11], r4, r3, r1, 69, 19);
373 keyiter(k[12], r0, r4, r2, 70, 20);
374 keyiter(k[13], r1, r0, r3, 71, 21);
375 keyiter(k[14], r2, r1, r4, 72, 22);
376 keyiter(k[15], r3, r2, r0, 73, 23);
377 keyiter(k[16], r4, r3, r1, 74, 24);
378 keyiter(k[17], r0, r4, r2, 75, 25);
379 keyiter(k[18], r1, r0, r3, 76, 26);
380 keyiter(k[19], r2, r1, r4, 77, 27);
381 keyiter(k[20], r3, r2, r0, 78, 28);
382 keyiter(k[21], r4, r3, r1, 79, 29);
383 keyiter(k[22], r0, r4, r2, 80, 30);
384 keyiter(k[23], r1, r0, r3, 81, 31);
385
386 k += 50;
387
388 keyiter(k[-26], r2, r1, r4, 82, -18);
389 keyiter(k[-25], r3, r2, r0, 83, -17);
390 keyiter(k[-24], r4, r3, r1, 84, -16);
391 keyiter(k[-23], r0, r4, r2, 85, -15);
392 keyiter(k[-22], r1, r0, r3, 86, -14);
393 keyiter(k[-21], r2, r1, r4, 87, -13);
394 keyiter(k[-20], r3, r2, r0, 88, -12);
395 keyiter(k[-19], r4, r3, r1, 89, -11);
396 keyiter(k[-18], r0, r4, r2, 90, -10);
397 keyiter(k[-17], r1, r0, r3, 91, -9);
398 keyiter(k[-16], r2, r1, r4, 92, -8);
399 keyiter(k[-15], r3, r2, r0, 93, -7);
400 keyiter(k[-14], r4, r3, r1, 94, -6);
401 keyiter(k[-13], r0, r4, r2, 95, -5);
402 keyiter(k[-12], r1, r0, r3, 96, -4);
403 keyiter(k[-11], r2, r1, r4, 97, -3);
404 keyiter(k[-10], r3, r2, r0, 98, -2);
405 keyiter(k[-9], r4, r3, r1, 99, -1);
406 keyiter(k[-8], r0, r4, r2, 100, 0);
407 keyiter(k[-7], r1, r0, r3, 101, 1);
408 keyiter(k[-6], r2, r1, r4, 102, 2);
409 keyiter(k[-5], r3, r2, r0, 103, 3);
410 keyiter(k[-4], r4, r3, r1, 104, 4);
411 keyiter(k[-3], r0, r4, r2, 105, 5);
412 keyiter(k[-2], r1, r0, r3, 106, 6);
413 keyiter(k[-1], r2, r1, r4, 107, 7);
414 keyiter(k[0], r3, r2, r0, 108, 8);
415 keyiter(k[1], r4, r3, r1, 109, 9);
416 keyiter(k[2], r0, r4, r2, 110, 10);
417 keyiter(k[3], r1, r0, r3, 111, 11);
418 keyiter(k[4], r2, r1, r4, 112, 12);
419 keyiter(k[5], r3, r2, r0, 113, 13);
420 keyiter(k[6], r4, r3, r1, 114, 14);
421 keyiter(k[7], r0, r4, r2, 115, 15);
422 keyiter(k[8], r1, r0, r3, 116, 16);
423 keyiter(k[9], r2, r1, r4, 117, 17);
424 keyiter(k[10], r3, r2, r0, 118, 18);
425 keyiter(k[11], r4, r3, r1, 119, 19);
426 keyiter(k[12], r0, r4, r2, 120, 20);
427 keyiter(k[13], r1, r0, r3, 121, 21);
428 keyiter(k[14], r2, r1, r4, 122, 22);
429 keyiter(k[15], r3, r2, r0, 123, 23);
430 keyiter(k[16], r4, r3, r1, 124, 24);
431 keyiter(k[17], r0, r4, r2, 125, 25);
432 keyiter(k[18], r1, r0, r3, 126, 26);
433 keyiter(k[19], r2, r1, r4, 127, 27);
434 keyiter(k[20], r3, r2, r0, 128, 28);
435 keyiter(k[21], r4, r3, r1, 129, 29);
436 keyiter(k[22], r0, r4, r2, 130, 30);
437 keyiter(k[23], r1, r0, r3, 131, 31);
438
439 /* Apply S-boxes */
440 __serpent_setkey_sbox(r0, r1, r2, r3, r4, ctx->expkey);
441
442 return 0;
443 }
444 EXPORT_SYMBOL_GPL(__serpent_setkey);
445
serpent_setkey(struct crypto_tfm * tfm,const u8 * key,unsigned int keylen)446 int serpent_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
447 {
448 return __serpent_setkey(crypto_tfm_ctx(tfm), key, keylen);
449 }
450 EXPORT_SYMBOL_GPL(serpent_setkey);
451
__serpent_encrypt(struct serpent_ctx * ctx,u8 * dst,const u8 * src)452 void __serpent_encrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src)
453 {
454 const u32 *k = ctx->expkey;
455 const __le32 *s = (const __le32 *)src;
456 __le32 *d = (__le32 *)dst;
457 u32 r0, r1, r2, r3, r4;
458
459 /*
460 * Note: The conversions between u8* and u32* might cause trouble
461 * on architectures with stricter alignment rules than x86
462 */
463
464 r0 = le32_to_cpu(s[0]);
465 r1 = le32_to_cpu(s[1]);
466 r2 = le32_to_cpu(s[2]);
467 r3 = le32_to_cpu(s[3]);
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 d[0] = cpu_to_le32(r0);
504 d[1] = cpu_to_le32(r1);
505 d[2] = cpu_to_le32(r2);
506 d[3] = cpu_to_le32(r3);
507 }
508 EXPORT_SYMBOL_GPL(__serpent_encrypt);
509
serpent_encrypt(struct crypto_tfm * tfm,u8 * dst,const u8 * src)510 static 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
__serpent_decrypt(struct serpent_ctx * ctx,u8 * dst,const u8 * src)517 void __serpent_decrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src)
518 {
519 const u32 *k = ctx->expkey;
520 const __le32 *s = (const __le32 *)src;
521 __le32 *d = (__le32 *)dst;
522 u32 r0, r1, r2, r3, r4;
523
524 r0 = le32_to_cpu(s[0]);
525 r1 = le32_to_cpu(s[1]);
526 r2 = le32_to_cpu(s[2]);
527 r3 = le32_to_cpu(s[3]);
528
529 K(r0, r1, r2, r3, 32);
530 SI7(r0, r1, r2, r3, r4); KL(r1, r3, r0, r4, r2, 31);
531 SI6(r1, r3, r0, r4, r2); KL(r0, r2, r4, r1, r3, 30);
532 SI5(r0, r2, r4, r1, r3); KL(r2, r3, r0, r4, r1, 29);
533 SI4(r2, r3, r0, r4, r1); KL(r2, r0, r1, r4, r3, 28);
534 SI3(r2, r0, r1, r4, r3); KL(r1, r2, r3, r4, r0, 27);
535 SI2(r1, r2, r3, r4, r0); KL(r2, r0, r4, r3, r1, 26);
536 SI1(r2, r0, r4, r3, r1); KL(r1, r0, r4, r3, r2, 25);
537 SI0(r1, r0, r4, r3, r2); KL(r4, r2, r0, r1, r3, 24);
538 SI7(r4, r2, r0, r1, r3); KL(r2, r1, r4, r3, r0, 23);
539 SI6(r2, r1, r4, r3, r0); KL(r4, r0, r3, r2, r1, 22);
540 SI5(r4, r0, r3, r2, r1); KL(r0, r1, r4, r3, r2, 21);
541 SI4(r0, r1, r4, r3, r2); KL(r0, r4, r2, r3, r1, 20);
542 SI3(r0, r4, r2, r3, r1); KL(r2, r0, r1, r3, r4, 19);
543 SI2(r2, r0, r1, r3, r4); KL(r0, r4, r3, r1, r2, 18);
544 SI1(r0, r4, r3, r1, r2); KL(r2, r4, r3, r1, r0, 17);
545 SI0(r2, r4, r3, r1, r0); KL(r3, r0, r4, r2, r1, 16);
546 SI7(r3, r0, r4, r2, r1); KL(r0, r2, r3, r1, r4, 15);
547 SI6(r0, r2, r3, r1, r4); KL(r3, r4, r1, r0, r2, 14);
548 SI5(r3, r4, r1, r0, r2); KL(r4, r2, r3, r1, r0, 13);
549 SI4(r4, r2, r3, r1, r0); KL(r4, r3, r0, r1, r2, 12);
550 SI3(r4, r3, r0, r1, r2); KL(r0, r4, r2, r1, r3, 11);
551 SI2(r0, r4, r2, r1, r3); KL(r4, r3, r1, r2, r0, 10);
552 SI1(r4, r3, r1, r2, r0); KL(r0, r3, r1, r2, r4, 9);
553 SI0(r0, r3, r1, r2, r4); KL(r1, r4, r3, r0, r2, 8);
554 SI7(r1, r4, r3, r0, r2); KL(r4, r0, r1, r2, r3, 7);
555 SI6(r4, r0, r1, r2, r3); KL(r1, r3, r2, r4, r0, 6);
556 SI5(r1, r3, r2, r4, r0); KL(r3, r0, r1, r2, r4, 5);
557 SI4(r3, r0, r1, r2, r4); KL(r3, r1, r4, r2, r0, 4);
558 SI3(r3, r1, r4, r2, r0); KL(r4, r3, r0, r2, r1, 3);
559 SI2(r4, r3, r0, r2, r1); KL(r3, r1, r2, r0, r4, 2);
560 SI1(r3, r1, r2, r0, r4); KL(r4, r1, r2, r0, r3, 1);
561 SI0(r4, r1, r2, r0, r3); K(r2, r3, r1, r4, 0);
562
563 d[0] = cpu_to_le32(r2);
564 d[1] = cpu_to_le32(r3);
565 d[2] = cpu_to_le32(r1);
566 d[3] = cpu_to_le32(r4);
567 }
568 EXPORT_SYMBOL_GPL(__serpent_decrypt);
569
serpent_decrypt(struct crypto_tfm * tfm,u8 * dst,const u8 * src)570 static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
571 {
572 struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
573
574 __serpent_decrypt(ctx, dst, src);
575 }
576
tnepres_setkey(struct crypto_tfm * tfm,const u8 * key,unsigned int keylen)577 static int tnepres_setkey(struct crypto_tfm *tfm, const u8 *key,
578 unsigned int keylen)
579 {
580 u8 rev_key[SERPENT_MAX_KEY_SIZE];
581 int i;
582
583 for (i = 0; i < keylen; ++i)
584 rev_key[keylen - i - 1] = key[i];
585
586 return serpent_setkey(tfm, rev_key, keylen);
587 }
588
tnepres_encrypt(struct crypto_tfm * tfm,u8 * dst,const u8 * src)589 static void tnepres_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
590 {
591 const u32 * const s = (const u32 * const)src;
592 u32 * const d = (u32 * const)dst;
593
594 u32 rs[4], rd[4];
595
596 rs[0] = swab32(s[3]);
597 rs[1] = swab32(s[2]);
598 rs[2] = swab32(s[1]);
599 rs[3] = swab32(s[0]);
600
601 serpent_encrypt(tfm, (u8 *)rd, (u8 *)rs);
602
603 d[0] = swab32(rd[3]);
604 d[1] = swab32(rd[2]);
605 d[2] = swab32(rd[1]);
606 d[3] = swab32(rd[0]);
607 }
608
tnepres_decrypt(struct crypto_tfm * tfm,u8 * dst,const u8 * src)609 static void tnepres_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
610 {
611 const u32 * const s = (const u32 * const)src;
612 u32 * const d = (u32 * const)dst;
613
614 u32 rs[4], rd[4];
615
616 rs[0] = swab32(s[3]);
617 rs[1] = swab32(s[2]);
618 rs[2] = swab32(s[1]);
619 rs[3] = swab32(s[0]);
620
621 serpent_decrypt(tfm, (u8 *)rd, (u8 *)rs);
622
623 d[0] = swab32(rd[3]);
624 d[1] = swab32(rd[2]);
625 d[2] = swab32(rd[1]);
626 d[3] = swab32(rd[0]);
627 }
628
629 static struct crypto_alg srp_algs[2] = { {
630 .cra_name = "serpent",
631 .cra_driver_name = "serpent-generic",
632 .cra_priority = 100,
633 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
634 .cra_blocksize = SERPENT_BLOCK_SIZE,
635 .cra_ctxsize = sizeof(struct serpent_ctx),
636 .cra_alignmask = 3,
637 .cra_module = THIS_MODULE,
638 .cra_u = { .cipher = {
639 .cia_min_keysize = SERPENT_MIN_KEY_SIZE,
640 .cia_max_keysize = SERPENT_MAX_KEY_SIZE,
641 .cia_setkey = serpent_setkey,
642 .cia_encrypt = serpent_encrypt,
643 .cia_decrypt = serpent_decrypt } }
644 }, {
645 .cra_name = "tnepres",
646 .cra_driver_name = "tnepres-generic",
647 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
648 .cra_blocksize = SERPENT_BLOCK_SIZE,
649 .cra_ctxsize = sizeof(struct serpent_ctx),
650 .cra_alignmask = 3,
651 .cra_module = THIS_MODULE,
652 .cra_u = { .cipher = {
653 .cia_min_keysize = SERPENT_MIN_KEY_SIZE,
654 .cia_max_keysize = SERPENT_MAX_KEY_SIZE,
655 .cia_setkey = tnepres_setkey,
656 .cia_encrypt = tnepres_encrypt,
657 .cia_decrypt = tnepres_decrypt } }
658 } };
659
serpent_mod_init(void)660 static int __init serpent_mod_init(void)
661 {
662 return crypto_register_algs(srp_algs, ARRAY_SIZE(srp_algs));
663 }
664
serpent_mod_fini(void)665 static void __exit serpent_mod_fini(void)
666 {
667 crypto_unregister_algs(srp_algs, ARRAY_SIZE(srp_algs));
668 }
669
670 subsys_initcall(serpent_mod_init);
671 module_exit(serpent_mod_fini);
672
673 MODULE_LICENSE("GPL");
674 MODULE_DESCRIPTION("Serpent and tnepres (kerneli compatible serpent reversed) Cipher Algorithm");
675 MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>");
676 MODULE_ALIAS_CRYPTO("tnepres");
677 MODULE_ALIAS_CRYPTO("serpent");
678 MODULE_ALIAS_CRYPTO("serpent-generic");
679
