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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#include <linux/types.h>
24
25
26
27
28
29#define SERPENT_MIN_KEY_SIZE 0
30#define SERPENT_MAX_KEY_SIZE 32
31#define SERPENT_EXPKEY_WORDS 132
32#define SERPENT_BLOCK_SIZE 16
33
34#define PHI 0x9e3779b9UL
35
36#define keyiter(a,b,c,d,i,j) \
37 b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; b = rol32(b,11); k[j] = b;
38
39#define loadkeys(x0,x1,x2,x3,i) \
40 x0=k[i]; x1=k[i+1]; x2=k[i+2]; x3=k[i+3];
41
42#define storekeys(x0,x1,x2,x3,i) \
43 k[i]=x0; k[i+1]=x1; k[i+2]=x2; k[i+3]=x3;
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#define LK(x0,x1,x2,x3,x4,i) \
50 x0=rol32(x0,13);\
51 x2=rol32(x2,3); x1 ^= x0; x4 = x0 << 3; \
52 x3 ^= x2; x1 ^= x2; \
53 x1=rol32(x1,1); x3 ^= x4; \
54 x3=rol32(x3,7); x4 = x1; \
55 x0 ^= x1; x4 <<= 7; x2 ^= x3; \
56 x0 ^= x3; x2 ^= x4; x3 ^= k[4*i+3]; \
57 x1 ^= k[4*i+1]; x0=rol32(x0,5); x2=rol32(x2,22);\
58 x0 ^= k[4*i+0]; x2 ^= k[4*i+2];
59
60#define KL(x0,x1,x2,x3,x4,i) \
61 x0 ^= k[4*i+0]; x1 ^= k[4*i+1]; x2 ^= k[4*i+2]; \
62 x3 ^= k[4*i+3]; x0=ror32(x0,5); x2=ror32(x2,22);\
63 x4 = x1; x2 ^= x3; x0 ^= x3; \
64 x4 <<= 7; x0 ^= x1; x1=ror32(x1,1); \
65 x2 ^= x4; x3=ror32(x3,7); x4 = x0 << 3; \
66 x1 ^= x0; x3 ^= x4; x0=ror32(x0,13);\
67 x1 ^= x2; x3 ^= x2; x2=ror32(x2,3);
68
69#define S0(x0,x1,x2,x3,x4) \
70 x4 = x3; \
71 x3 |= x0; x0 ^= x4; x4 ^= x2; \
72 x4 =~ x4; x3 ^= x1; x1 &= x0; \
73 x1 ^= x4; x2 ^= x0; x0 ^= x3; \
74 x4 |= x0; x0 ^= x2; x2 &= x1; \
75 x3 ^= x2; x1 =~ x1; x2 ^= x4; \
76 x1 ^= x2;
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#define S2(x0,x1,x2,x3,x4) \
88 x3 =~ x3; \
89 x1 ^= x0; x4 = x0; x0 &= x2; \
90 x0 ^= x3; x3 |= x4; x2 ^= x1; \
91 x3 ^= x1; x1 &= x0; x0 ^= x2; \
92 x2 &= x3; x3 |= x1; x0 =~ x0; \
93 x3 ^= x0; x4 ^= x0; x0 ^= x2; \
94 x1 |= x2;
95
96#define S3(x0,x1,x2,x3,x4) \
97 x4 = x1; \
98 x1 ^= x3; x3 |= x0; x4 &= x0; \
99 x0 ^= x2; x2 ^= x1; x1 &= x3; \
100 x2 ^= x3; x0 |= x4; x4 ^= x3; \
101 x1 ^= x0; x0 &= x3; x3 &= x4; \
102 x3 ^= x2; x4 |= x1; x2 &= x1; \
103 x4 ^= x3; x0 ^= x3; x3 ^= x2;
104
105#define S4(x0,x1,x2,x3,x4) \
106 x4 = x3; \
107 x3 &= x0; x0 ^= x4; \
108 x3 ^= x2; x2 |= x4; x0 ^= x1; \
109 x4 ^= x3; x2 |= x0; \
110 x2 ^= x1; x1 &= x0; \
111 x1 ^= x4; x4 &= x2; x2 ^= x3; \
112 x4 ^= x0; x3 |= x1; x1 =~ x1; \
113 x3 ^= x0;
114
115#define S5(x0,x1,x2,x3,x4) \
116 x4 = x1; x1 |= x0; \
117 x2 ^= x1; x3 =~ x3; x4 ^= x0; \
118 x0 ^= x2; x1 &= x4; x4 |= x3; \
119 x4 ^= x0; x0 &= x3; x1 ^= x3; \
120 x3 ^= x2; x0 ^= x1; x2 &= x4; \
121 x1 ^= x2; x2 &= x0; \
122 x3 ^= x2;
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#define S7(x0,x1,x2,x3,x4) \
134 x1 =~ x1; \
135 x4 = x1; x0 =~ x0; x1 &= x2; \
136 x1 ^= x3; x3 |= x4; x4 ^= x2; \
137 x2 ^= x3; x3 ^= x0; x0 |= x1; \
138 x2 &= x0; x0 ^= x4; x4 ^= x3; \
139 x3 &= x0; x4 ^= x1; \
140 x2 ^= x4; x3 ^= x1; x4 |= x0; \
141 x4 ^= x1;
142
143#define SI0(x0,x1,x2,x3,x4) \
144 x4 = x3; x1 ^= x0; \
145 x3 |= x1; x4 ^= x1; x0 =~ x0; \
146 x2 ^= x3; x3 ^= x0; x0 &= x1; \
147 x0 ^= x2; x2 &= x3; x3 ^= x4; \
148 x2 ^= x3; x1 ^= x3; x3 &= x0; \
149 x1 ^= x0; x0 ^= x2; x4 ^= x3;
150
151#define SI1(x0,x1,x2,x3,x4) \
152 x1 ^= x3; x4 = x0; \
153 x0 ^= x2; x2 =~ x2; x4 |= x1; \
154 x4 ^= x3; x3 &= x1; x1 ^= x2; \
155 x2 &= x4; x4 ^= x1; x1 |= x3; \
156 x3 ^= x0; x2 ^= x0; x0 |= x4; \
157 x2 ^= x4; x1 ^= x0; \
158 x4 ^= x1;
159
160#define SI2(x0,x1,x2,x3,x4) \
161 x2 ^= x1; x4 = x3; x3 =~ x3; \
162 x3 |= x2; x2 ^= x4; x4 ^= x0; \
163 x3 ^= x1; x1 |= x2; x2 ^= x0; \
164 x1 ^= x4; x4 |= x3; x2 ^= x3; \
165 x4 ^= x2; x2 &= x1; \
166 x2 ^= x3; x3 ^= x4; x4 ^= x0;
167
168#define SI3(x0,x1,x2,x3,x4) \
169 x2 ^= x1; \
170 x4 = x1; x1 &= x2; \
171 x1 ^= x0; x0 |= x4; x4 ^= x3; \
172 x0 ^= x3; x3 |= x1; x1 ^= x2; \
173 x1 ^= x3; x0 ^= x2; x2 ^= x3; \
174 x3 &= x1; x1 ^= x0; x0 &= x2; \
175 x4 ^= x3; x3 ^= x0; x0 ^= x1;
176
177#define SI4(x0,x1,x2,x3,x4) \
178 x2 ^= x3; x4 = x0; x0 &= x1; \
179 x0 ^= x2; x2 |= x3; x4 =~ x4; \
180 x1 ^= x0; x0 ^= x2; x2 &= x4; \
181 x2 ^= x0; x0 |= x4; \
182 x0 ^= x3; x3 &= x2; \
183 x4 ^= x3; x3 ^= x1; x1 &= x0; \
184 x4 ^= x1; x0 ^= x3;
185
186#define SI5(x0,x1,x2,x3,x4) \
187 x4 = x1; x1 |= x2; \
188 x2 ^= x4; x1 ^= x3; x3 &= x4; \
189 x2 ^= x3; x3 |= x0; x0 =~ x0; \
190 x3 ^= x2; x2 |= x0; x4 ^= x1; \
191 x2 ^= x4; x4 &= x0; x0 ^= x1; \
192 x1 ^= x3; x0 &= x2; x2 ^= x3; \
193 x0 ^= x2; x2 ^= x4; x4 ^= x3;
194
195#define SI6(x0,x1,x2,x3,x4) \
196 x0 ^= x2; \
197 x4 = x0; x0 &= x3; x2 ^= x3; \
198 x0 ^= x2; x3 ^= x1; x2 |= x4; \
199 x2 ^= x3; x3 &= x0; x0 =~ x0; \
200 x3 ^= x1; x1 &= x2; x4 ^= x0; \
201 x3 ^= x4; x4 ^= x2; x0 ^= x1; \
202 x2 ^= x0;
203
204#define SI7(x0,x1,x2,x3,x4) \
205 x4 = x3; x3 &= x0; x0 ^= x2; \
206 x2 |= x4; x4 ^= x1; x0 =~ x0; \
207 x1 |= x3; x4 ^= x0; x0 &= x2; \
208 x0 ^= x1; x1 &= x2; x3 ^= x2; \
209 x4 ^= x3; x2 &= x3; x3 |= x0; \
210 x1 ^= x4; x3 ^= x4; x4 &= x0; \
211 x4 ^= x2;
212
213struct serpent_ctx {
214 u32 expkey[SERPENT_EXPKEY_WORDS];
215};
216
217
218static int serpent_setkey(struct crypto_tfm *tfm, const u8 *key,
219 unsigned int keylen)
220{
221 struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
222 u32 *k = ctx->expkey;
223 u8 *k8 = (u8 *)k;
224 u32 r0,r1,r2,r3,r4;
225 int i;
226
227
228
229 for (i = 0; i < keylen; ++i)
230 k8[i] = key[i];
231 if (i < SERPENT_MAX_KEY_SIZE)
232 k8[i++] = 1;
233 while (i < SERPENT_MAX_KEY_SIZE)
234 k8[i++] = 0;
235
236
237
238 r0 = le32_to_cpu(k[3]);
239 r1 = le32_to_cpu(k[4]);
240 r2 = le32_to_cpu(k[5]);
241 r3 = le32_to_cpu(k[6]);
242 r4 = le32_to_cpu(k[7]);
243
244 keyiter(le32_to_cpu(k[0]),r0,r4,r2,0,0);
245 keyiter(le32_to_cpu(k[1]),r1,r0,r3,1,1);
246 keyiter(le32_to_cpu(k[2]),r2,r1,r4,2,2);
247 keyiter(le32_to_cpu(k[3]),r3,r2,r0,3,3);
248 keyiter(le32_to_cpu(k[4]),r4,r3,r1,4,4);
249 keyiter(le32_to_cpu(k[5]),r0,r4,r2,5,5);
250 keyiter(le32_to_cpu(k[6]),r1,r0,r3,6,6);
251 keyiter(le32_to_cpu(k[7]),r2,r1,r4,7,7);
252
253 keyiter(k[ 0],r3,r2,r0, 8, 8); keyiter(k[ 1],r4,r3,r1, 9, 9);
254 keyiter(k[ 2],r0,r4,r2, 10, 10); keyiter(k[ 3],r1,r0,r3, 11, 11);
255 keyiter(k[ 4],r2,r1,r4, 12, 12); keyiter(k[ 5],r3,r2,r0, 13, 13);
256 keyiter(k[ 6],r4,r3,r1, 14, 14); keyiter(k[ 7],r0,r4,r2, 15, 15);
257 keyiter(k[ 8],r1,r0,r3, 16, 16); keyiter(k[ 9],r2,r1,r4, 17, 17);
258 keyiter(k[ 10],r3,r2,r0, 18, 18); keyiter(k[ 11],r4,r3,r1, 19, 19);
259 keyiter(k[ 12],r0,r4,r2, 20, 20); keyiter(k[ 13],r1,r0,r3, 21, 21);
260 keyiter(k[ 14],r2,r1,r4, 22, 22); keyiter(k[ 15],r3,r2,r0, 23, 23);
261 keyiter(k[ 16],r4,r3,r1, 24, 24); keyiter(k[ 17],r0,r4,r2, 25, 25);
262 keyiter(k[ 18],r1,r0,r3, 26, 26); keyiter(k[ 19],r2,r1,r4, 27, 27);
263 keyiter(k[ 20],r3,r2,r0, 28, 28); keyiter(k[ 21],r4,r3,r1, 29, 29);
264 keyiter(k[ 22],r0,r4,r2, 30, 30); keyiter(k[ 23],r1,r0,r3, 31, 31);
265
266 k += 50;
267
268 keyiter(k[-26],r2,r1,r4, 32,-18); keyiter(k[-25],r3,r2,r0, 33,-17);
269 keyiter(k[-24],r4,r3,r1, 34,-16); keyiter(k[-23],r0,r4,r2, 35,-15);
270 keyiter(k[-22],r1,r0,r3, 36,-14); keyiter(k[-21],r2,r1,r4, 37,-13);
271 keyiter(k[-20],r3,r2,r0, 38,-12); keyiter(k[-19],r4,r3,r1, 39,-11);
272 keyiter(k[-18],r0,r4,r2, 40,-10); keyiter(k[-17],r1,r0,r3, 41, -9);
273 keyiter(k[-16],r2,r1,r4, 42, -8); keyiter(k[-15],r3,r2,r0, 43, -7);
274 keyiter(k[-14],r4,r3,r1, 44, -6); keyiter(k[-13],r0,r4,r2, 45, -5);
275 keyiter(k[-12],r1,r0,r3, 46, -4); keyiter(k[-11],r2,r1,r4, 47, -3);
276 keyiter(k[-10],r3,r2,r0, 48, -2); keyiter(k[ -9],r4,r3,r1, 49, -1);
277 keyiter(k[ -8],r0,r4,r2, 50, 0); keyiter(k[ -7],r1,r0,r3, 51, 1);
278 keyiter(k[ -6],r2,r1,r4, 52, 2); keyiter(k[ -5],r3,r2,r0, 53, 3);
279 keyiter(k[ -4],r4,r3,r1, 54, 4); keyiter(k[ -3],r0,r4,r2, 55, 5);
280 keyiter(k[ -2],r1,r0,r3, 56, 6); keyiter(k[ -1],r2,r1,r4, 57, 7);
281 keyiter(k[ 0],r3,r2,r0, 58, 8); keyiter(k[ 1],r4,r3,r1, 59, 9);
282 keyiter(k[ 2],r0,r4,r2, 60, 10); keyiter(k[ 3],r1,r0,r3, 61, 11);
283 keyiter(k[ 4],r2,r1,r4, 62, 12); keyiter(k[ 5],r3,r2,r0, 63, 13);
284 keyiter(k[ 6],r4,r3,r1, 64, 14); keyiter(k[ 7],r0,r4,r2, 65, 15);
285 keyiter(k[ 8],r1,r0,r3, 66, 16); keyiter(k[ 9],r2,r1,r4, 67, 17);
286 keyiter(k[ 10],r3,r2,r0, 68, 18); keyiter(k[ 11],r4,r3,r1, 69, 19);
287 keyiter(k[ 12],r0,r4,r2, 70, 20); keyiter(k[ 13],r1,r0,r3, 71, 21);
288 keyiter(k[ 14],r2,r1,r4, 72, 22); keyiter(k[ 15],r3,r2,r0, 73, 23);
289 keyiter(k[ 16],r4,r3,r1, 74, 24); keyiter(k[ 17],r0,r4,r2, 75, 25);
290 keyiter(k[ 18],r1,r0,r3, 76, 26); keyiter(k[ 19],r2,r1,r4, 77, 27);
291 keyiter(k[ 20],r3,r2,r0, 78, 28); keyiter(k[ 21],r4,r3,r1, 79, 29);
292 keyiter(k[ 22],r0,r4,r2, 80, 30); keyiter(k[ 23],r1,r0,r3, 81, 31);
293
294 k += 50;
295
296 keyiter(k[-26],r2,r1,r4, 82,-18); keyiter(k[-25],r3,r2,r0, 83,-17);
297 keyiter(k[-24],r4,r3,r1, 84,-16); keyiter(k[-23],r0,r4,r2, 85,-15);
298 keyiter(k[-22],r1,r0,r3, 86,-14); keyiter(k[-21],r2,r1,r4, 87,-13);
299 keyiter(k[-20],r3,r2,r0, 88,-12); keyiter(k[-19],r4,r3,r1, 89,-11);
300 keyiter(k[-18],r0,r4,r2, 90,-10); keyiter(k[-17],r1,r0,r3, 91, -9);
301 keyiter(k[-16],r2,r1,r4, 92, -8); keyiter(k[-15],r3,r2,r0, 93, -7);
302 keyiter(k[-14],r4,r3,r1, 94, -6); keyiter(k[-13],r0,r4,r2, 95, -5);
303 keyiter(k[-12],r1,r0,r3, 96, -4); keyiter(k[-11],r2,r1,r4, 97, -3);
304 keyiter(k[-10],r3,r2,r0, 98, -2); keyiter(k[ -9],r4,r3,r1, 99, -1);
305 keyiter(k[ -8],r0,r4,r2,100, 0); keyiter(k[ -7],r1,r0,r3,101, 1);
306 keyiter(k[ -6],r2,r1,r4,102, 2); keyiter(k[ -5],r3,r2,r0,103, 3);
307 keyiter(k[ -4],r4,r3,r1,104, 4); keyiter(k[ -3],r0,r4,r2,105, 5);
308 keyiter(k[ -2],r1,r0,r3,106, 6); keyiter(k[ -1],r2,r1,r4,107, 7);
309 keyiter(k[ 0],r3,r2,r0,108, 8); keyiter(k[ 1],r4,r3,r1,109, 9);
310 keyiter(k[ 2],r0,r4,r2,110, 10); keyiter(k[ 3],r1,r0,r3,111, 11);
311 keyiter(k[ 4],r2,r1,r4,112, 12); keyiter(k[ 5],r3,r2,r0,113, 13);
312 keyiter(k[ 6],r4,r3,r1,114, 14); keyiter(k[ 7],r0,r4,r2,115, 15);
313 keyiter(k[ 8],r1,r0,r3,116, 16); keyiter(k[ 9],r2,r1,r4,117, 17);
314 keyiter(k[ 10],r3,r2,r0,118, 18); keyiter(k[ 11],r4,r3,r1,119, 19);
315 keyiter(k[ 12],r0,r4,r2,120, 20); keyiter(k[ 13],r1,r0,r3,121, 21);
316 keyiter(k[ 14],r2,r1,r4,122, 22); keyiter(k[ 15],r3,r2,r0,123, 23);
317 keyiter(k[ 16],r4,r3,r1,124, 24); keyiter(k[ 17],r0,r4,r2,125, 25);
318 keyiter(k[ 18],r1,r0,r3,126, 26); keyiter(k[ 19],r2,r1,r4,127, 27);
319 keyiter(k[ 20],r3,r2,r0,128, 28); keyiter(k[ 21],r4,r3,r1,129, 29);
320 keyiter(k[ 22],r0,r4,r2,130, 30); keyiter(k[ 23],r1,r0,r3,131, 31);
321
322
323
324 S3(r3,r4,r0,r1,r2); storekeys(r1,r2,r4,r3, 28); loadkeys(r1,r2,r4,r3, 24);
325 S4(r1,r2,r4,r3,r0); storekeys(r2,r4,r3,r0, 24); loadkeys(r2,r4,r3,r0, 20);
326 S5(r2,r4,r3,r0,r1); storekeys(r1,r2,r4,r0, 20); loadkeys(r1,r2,r4,r0, 16);
327 S6(r1,r2,r4,r0,r3); storekeys(r4,r3,r2,r0, 16); loadkeys(r4,r3,r2,r0, 12);
328 S7(r4,r3,r2,r0,r1); storekeys(r1,r2,r0,r4, 12); loadkeys(r1,r2,r0,r4, 8);
329 S0(r1,r2,r0,r4,r3); storekeys(r0,r2,r4,r1, 8); loadkeys(r0,r2,r4,r1, 4);
330 S1(r0,r2,r4,r1,r3); storekeys(r3,r4,r1,r0, 4); loadkeys(r3,r4,r1,r0, 0);
331 S2(r3,r4,r1,r0,r2); storekeys(r2,r4,r3,r0, 0); loadkeys(r2,r4,r3,r0, -4);
332 S3(r2,r4,r3,r0,r1); storekeys(r0,r1,r4,r2, -4); loadkeys(r0,r1,r4,r2, -8);
333 S4(r0,r1,r4,r2,r3); storekeys(r1,r4,r2,r3, -8); loadkeys(r1,r4,r2,r3,-12);
334 S5(r1,r4,r2,r3,r0); storekeys(r0,r1,r4,r3,-12); loadkeys(r0,r1,r4,r3,-16);
335 S6(r0,r1,r4,r3,r2); storekeys(r4,r2,r1,r3,-16); loadkeys(r4,r2,r1,r3,-20);
336 S7(r4,r2,r1,r3,r0); storekeys(r0,r1,r3,r4,-20); loadkeys(r0,r1,r3,r4,-24);
337 S0(r0,r1,r3,r4,r2); storekeys(r3,r1,r4,r0,-24); loadkeys(r3,r1,r4,r0,-28);
338 k -= 50;
339 S1(r3,r1,r4,r0,r2); storekeys(r2,r4,r0,r3, 22); loadkeys(r2,r4,r0,r3, 18);
340 S2(r2,r4,r0,r3,r1); storekeys(r1,r4,r2,r3, 18); loadkeys(r1,r4,r2,r3, 14);
341 S3(r1,r4,r2,r3,r0); storekeys(r3,r0,r4,r1, 14); loadkeys(r3,r0,r4,r1, 10);
342 S4(r3,r0,r4,r1,r2); storekeys(r0,r4,r1,r2, 10); loadkeys(r0,r4,r1,r2, 6);
343 S5(r0,r4,r1,r2,r3); storekeys(r3,r0,r4,r2, 6); loadkeys(r3,r0,r4,r2, 2);
344 S6(r3,r0,r4,r2,r1); storekeys(r4,r1,r0,r2, 2); loadkeys(r4,r1,r0,r2, -2);
345 S7(r4,r1,r0,r2,r3); storekeys(r3,r0,r2,r4, -2); loadkeys(r3,r0,r2,r4, -6);
346 S0(r3,r0,r2,r4,r1); storekeys(r2,r0,r4,r3, -6); loadkeys(r2,r0,r4,r3,-10);
347 S1(r2,r0,r4,r3,r1); storekeys(r1,r4,r3,r2,-10); loadkeys(r1,r4,r3,r2,-14);
348 S2(r1,r4,r3,r2,r0); storekeys(r0,r4,r1,r2,-14); loadkeys(r0,r4,r1,r2,-18);
349 S3(r0,r4,r1,r2,r3); storekeys(r2,r3,r4,r0,-18); loadkeys(r2,r3,r4,r0,-22);
350 k -= 50;
351 S4(r2,r3,r4,r0,r1); storekeys(r3,r4,r0,r1, 28); loadkeys(r3,r4,r0,r1, 24);
352 S5(r3,r4,r0,r1,r2); storekeys(r2,r3,r4,r1, 24); loadkeys(r2,r3,r4,r1, 20);
353 S6(r2,r3,r4,r1,r0); storekeys(r4,r0,r3,r1, 20); loadkeys(r4,r0,r3,r1, 16);
354 S7(r4,r0,r3,r1,r2); storekeys(r2,r3,r1,r4, 16); loadkeys(r2,r3,r1,r4, 12);
355 S0(r2,r3,r1,r4,r0); storekeys(r1,r3,r4,r2, 12); loadkeys(r1,r3,r4,r2, 8);
356 S1(r1,r3,r4,r2,r0); storekeys(r0,r4,r2,r1, 8); loadkeys(r0,r4,r2,r1, 4);
357 S2(r0,r4,r2,r1,r3); storekeys(r3,r4,r0,r1, 4); loadkeys(r3,r4,r0,r1, 0);
358 S3(r3,r4,r0,r1,r2); storekeys(r1,r2,r4,r3, 0);
359
360 return 0;
361}
362
363static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
364{
365 struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
366 const u32
367 *k = ctx->expkey;
368 const __le32 *s = (const __le32 *)src;
369 __le32 *d = (__le32 *)dst;
370 u32 r0, r1, r2, r3, r4;
371
372
373
374
375
376
377 r0 = le32_to_cpu(s[0]);
378 r1 = le32_to_cpu(s[1]);
379 r2 = le32_to_cpu(s[2]);
380 r3 = le32_to_cpu(s[3]);
381
382 K(r0,r1,r2,r3,0);
383 S0(r0,r1,r2,r3,r4); LK(r2,r1,r3,r0,r4,1);
384 S1(r2,r1,r3,r0,r4); LK(r4,r3,r0,r2,r1,2);
385 S2(r4,r3,r0,r2,r1); LK(r1,r3,r4,r2,r0,3);
386 S3(r1,r3,r4,r2,r0); LK(r2,r0,r3,r1,r4,4);
387 S4(r2,r0,r3,r1,r4); LK(r0,r3,r1,r4,r2,5);
388 S5(r0,r3,r1,r4,r2); LK(r2,r0,r3,r4,r1,6);
389 S6(r2,r0,r3,r4,r1); LK(r3,r1,r0,r4,r2,7);
390 S7(r3,r1,r0,r4,r2); LK(r2,r0,r4,r3,r1,8);
391 S0(r2,r0,r4,r3,r1); LK(r4,r0,r3,r2,r1,9);
392 S1(r4,r0,r3,r2,r1); LK(r1,r3,r2,r4,r0,10);
393 S2(r1,r3,r2,r4,r0); LK(r0,r3,r1,r4,r2,11);
394 S3(r0,r3,r1,r4,r2); LK(r4,r2,r3,r0,r1,12);
395 S4(r4,r2,r3,r0,r1); LK(r2,r3,r0,r1,r4,13);
396 S5(r2,r3,r0,r1,r4); LK(r4,r2,r3,r1,r0,14);
397 S6(r4,r2,r3,r1,r0); LK(r3,r0,r2,r1,r4,15);
398 S7(r3,r0,r2,r1,r4); LK(r4,r2,r1,r3,r0,16);
399 S0(r4,r2,r1,r3,r0); LK(r1,r2,r3,r4,r0,17);
400 S1(r1,r2,r3,r4,r0); LK(r0,r3,r4,r1,r2,18);
401 S2(r0,r3,r4,r1,r2); LK(r2,r3,r0,r1,r4,19);
402 S3(r2,r3,r0,r1,r4); LK(r1,r4,r3,r2,r0,20);
403 S4(r1,r4,r3,r2,r0); LK(r4,r3,r2,r0,r1,21);
404 S5(r4,r3,r2,r0,r1); LK(r1,r4,r3,r0,r2,22);
405 S6(r1,r4,r3,r0,r2); LK(r3,r2,r4,r0,r1,23);
406 S7(r3,r2,r4,r0,r1); LK(r1,r4,r0,r3,r2,24);
407 S0(r1,r4,r0,r3,r2); LK(r0,r4,r3,r1,r2,25);
408 S1(r0,r4,r3,r1,r2); LK(r2,r3,r1,r0,r4,26);
409 S2(r2,r3,r1,r0,r4); LK(r4,r3,r2,r0,r1,27);
410 S3(r4,r3,r2,r0,r1); LK(r0,r1,r3,r4,r2,28);
411 S4(r0,r1,r3,r4,r2); LK(r1,r3,r4,r2,r0,29);
412 S5(r1,r3,r4,r2,r0); LK(r0,r1,r3,r2,r4,30);
413 S6(r0,r1,r3,r2,r4); LK(r3,r4,r1,r2,r0,31);
414 S7(r3,r4,r1,r2,r0); K(r0,r1,r2,r3,32);
415
416 d[0] = cpu_to_le32(r0);
417 d[1] = cpu_to_le32(r1);
418 d[2] = cpu_to_le32(r2);
419 d[3] = cpu_to_le32(r3);
420}
421
422static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
423{
424 struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
425 const u32
426 *k = ((struct serpent_ctx *)ctx)->expkey;
427 const __le32 *s = (const __le32 *)src;
428 __le32 *d = (__le32 *)dst;
429 u32 r0, r1, r2, r3, r4;
430
431 r0 = le32_to_cpu(s[0]);
432 r1 = le32_to_cpu(s[1]);
433 r2 = le32_to_cpu(s[2]);
434 r3 = le32_to_cpu(s[3]);
435
436 K(r0,r1,r2,r3,32);
437 SI7(r0,r1,r2,r3,r4); KL(r1,r3,r0,r4,r2,31);
438 SI6(r1,r3,r0,r4,r2); KL(r0,r2,r4,r1,r3,30);
439 SI5(r0,r2,r4,r1,r3); KL(r2,r3,r0,r4,r1,29);
440 SI4(r2,r3,r0,r4,r1); KL(r2,r0,r1,r4,r3,28);
441 SI3(r2,r0,r1,r4,r3); KL(r1,r2,r3,r4,r0,27);
442 SI2(r1,r2,r3,r4,r0); KL(r2,r0,r4,r3,r1,26);
443 SI1(r2,r0,r4,r3,r1); KL(r1,r0,r4,r3,r2,25);
444 SI0(r1,r0,r4,r3,r2); KL(r4,r2,r0,r1,r3,24);
445 SI7(r4,r2,r0,r1,r3); KL(r2,r1,r4,r3,r0,23);
446 SI6(r2,r1,r4,r3,r0); KL(r4,r0,r3,r2,r1,22);
447 SI5(r4,r0,r3,r2,r1); KL(r0,r1,r4,r3,r2,21);
448 SI4(r0,r1,r4,r3,r2); KL(r0,r4,r2,r3,r1,20);
449 SI3(r0,r4,r2,r3,r1); KL(r2,r0,r1,r3,r4,19);
450 SI2(r2,r0,r1,r3,r4); KL(r0,r4,r3,r1,r2,18);
451 SI1(r0,r4,r3,r1,r2); KL(r2,r4,r3,r1,r0,17);
452 SI0(r2,r4,r3,r1,r0); KL(r3,r0,r4,r2,r1,16);
453 SI7(r3,r0,r4,r2,r1); KL(r0,r2,r3,r1,r4,15);
454 SI6(r0,r2,r3,r1,r4); KL(r3,r4,r1,r0,r2,14);
455 SI5(r3,r4,r1,r0,r2); KL(r4,r2,r3,r1,r0,13);
456 SI4(r4,r2,r3,r1,r0); KL(r4,r3,r0,r1,r2,12);
457 SI3(r4,r3,r0,r1,r2); KL(r0,r4,r2,r1,r3,11);
458 SI2(r0,r4,r2,r1,r3); KL(r4,r3,r1,r2,r0,10);
459 SI1(r4,r3,r1,r2,r0); KL(r0,r3,r1,r2,r4,9);
460 SI0(r0,r3,r1,r2,r4); KL(r1,r4,r3,r0,r2,8);
461 SI7(r1,r4,r3,r0,r2); KL(r4,r0,r1,r2,r3,7);
462 SI6(r4,r0,r1,r2,r3); KL(r1,r3,r2,r4,r0,6);
463 SI5(r1,r3,r2,r4,r0); KL(r3,r0,r1,r2,r4,5);
464 SI4(r3,r0,r1,r2,r4); KL(r3,r1,r4,r2,r0,4);
465 SI3(r3,r1,r4,r2,r0); KL(r4,r3,r0,r2,r1,3);
466 SI2(r4,r3,r0,r2,r1); KL(r3,r1,r2,r0,r4,2);
467 SI1(r3,r1,r2,r0,r4); KL(r4,r1,r2,r0,r3,1);
468 SI0(r4,r1,r2,r0,r3); K(r2,r3,r1,r4,0);
469
470 d[0] = cpu_to_le32(r2);
471 d[1] = cpu_to_le32(r3);
472 d[2] = cpu_to_le32(r1);
473 d[3] = cpu_to_le32(r4);
474}
475
476static struct crypto_alg serpent_alg = {
477 .cra_name = "serpent",
478 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
479 .cra_blocksize = SERPENT_BLOCK_SIZE,
480 .cra_ctxsize = sizeof(struct serpent_ctx),
481 .cra_alignmask = 3,
482 .cra_module = THIS_MODULE,
483 .cra_list = LIST_HEAD_INIT(serpent_alg.cra_list),
484 .cra_u = { .cipher = {
485 .cia_min_keysize = SERPENT_MIN_KEY_SIZE,
486 .cia_max_keysize = SERPENT_MAX_KEY_SIZE,
487 .cia_setkey = serpent_setkey,
488 .cia_encrypt = serpent_encrypt,
489 .cia_decrypt = serpent_decrypt } }
490};
491
492static int tnepres_setkey(struct crypto_tfm *tfm, const u8 *key,
493 unsigned int keylen)
494{
495 u8 rev_key[SERPENT_MAX_KEY_SIZE];
496 int i;
497
498 for (i = 0; i < keylen; ++i)
499 rev_key[keylen - i - 1] = key[i];
500
501 return serpent_setkey(tfm, rev_key, keylen);
502}
503
504static void tnepres_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
505{
506 const u32 * const s = (const u32 * const)src;
507 u32 * const d = (u32 * const)dst;
508
509 u32 rs[4], rd[4];
510
511 rs[0] = swab32(s[3]);
512 rs[1] = swab32(s[2]);
513 rs[2] = swab32(s[1]);
514 rs[3] = swab32(s[0]);
515
516 serpent_encrypt(tfm, (u8 *)rd, (u8 *)rs);
517
518 d[0] = swab32(rd[3]);
519 d[1] = swab32(rd[2]);
520 d[2] = swab32(rd[1]);
521 d[3] = swab32(rd[0]);
522}
523
524static void tnepres_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
525{
526 const u32 * const s = (const u32 * const)src;
527 u32 * const d = (u32 * const)dst;
528
529 u32 rs[4], rd[4];
530
531 rs[0] = swab32(s[3]);
532 rs[1] = swab32(s[2]);
533 rs[2] = swab32(s[1]);
534 rs[3] = swab32(s[0]);
535
536 serpent_decrypt(tfm, (u8 *)rd, (u8 *)rs);
537
538 d[0] = swab32(rd[3]);
539 d[1] = swab32(rd[2]);
540 d[2] = swab32(rd[1]);
541 d[3] = swab32(rd[0]);
542}
543
544static struct crypto_alg tnepres_alg = {
545 .cra_name = "tnepres",
546 .cra_flags = CRYPTO_ALG_TYPE_CIPHER,
547 .cra_blocksize = SERPENT_BLOCK_SIZE,
548 .cra_ctxsize = sizeof(struct serpent_ctx),
549 .cra_alignmask = 3,
550 .cra_module = THIS_MODULE,
551 .cra_list = LIST_HEAD_INIT(serpent_alg.cra_list),
552 .cra_u = { .cipher = {
553 .cia_min_keysize = SERPENT_MIN_KEY_SIZE,
554 .cia_max_keysize = SERPENT_MAX_KEY_SIZE,
555 .cia_setkey = tnepres_setkey,
556 .cia_encrypt = tnepres_encrypt,
557 .cia_decrypt = tnepres_decrypt } }
558};
559
560static int __init serpent_mod_init(void)
561{
562 int ret = crypto_register_alg(&serpent_alg);
563
564 if (ret)
565 return ret;
566
567 ret = crypto_register_alg(&tnepres_alg);
568
569 if (ret)
570 crypto_unregister_alg(&serpent_alg);
571
572 return ret;
573}
574
575static void __exit serpent_mod_fini(void)
576{
577 crypto_unregister_alg(&tnepres_alg);
578 crypto_unregister_alg(&serpent_alg);
579}
580
581module_init(serpent_mod_init);
582module_exit(serpent_mod_fini);
583
584MODULE_LICENSE("GPL");
585MODULE_DESCRIPTION("Serpent and tnepres (kerneli compatible serpent reversed) Cipher Algorithm");
586MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>");
587MODULE_ALIAS("tnepres");
588
