1 #include <plan9.h>
2
3 /*
4 * Data Encryption Standard
5 * D.P.Mitchell 83/06/08.
6 *
7 * block_cipher(key, block, decrypting)
8 */
9
10 static long ip_low(char [8]);
11 static long ip_high(char [8]);
12 static void fp(long, long, char[8]);
13
14 extern int chatty9p;
15
16 /*
17 * Tables for Combined S and P Boxes
18 */
19
20 static long s0p[] = {
21 0x00410100,0x00010000,0x40400000,0x40410100,0x00400000,0x40010100,0x40010000,0x40400000,
22 0x40010100,0x00410100,0x00410000,0x40000100,0x40400100,0x00400000,0x00000000,0x40010000,
23 0x00010000,0x40000000,0x00400100,0x00010100,0x40410100,0x00410000,0x40000100,0x00400100,
24 0x40000000,0x00000100,0x00010100,0x40410000,0x00000100,0x40400100,0x40410000,0x00000000,
25 0x00000000,0x40410100,0x00400100,0x40010000,0x00410100,0x00010000,0x40000100,0x00400100,
26 0x40410000,0x00000100,0x00010100,0x40400000,0x40010100,0x40000000,0x40400000,0x00410000,
27 0x40410100,0x00010100,0x00410000,0x40400100,0x00400000,0x40000100,0x40010000,0x00000000,
28 0x00010000,0x00400000,0x40400100,0x00410100,0x40000000,0x40410000,0x00000100,0x40010100,
29 };
30
31 static long s1p[] = {
32 0x08021002,0x00000000,0x00021000,0x08020000,0x08000002,0x00001002,0x08001000,0x00021000,
33 0x00001000,0x08020002,0x00000002,0x08001000,0x00020002,0x08021000,0x08020000,0x00000002,
34 0x00020000,0x08001002,0x08020002,0x00001000,0x00021002,0x08000000,0x00000000,0x00020002,
35 0x08001002,0x00021002,0x08021000,0x08000002,0x08000000,0x00020000,0x00001002,0x08021002,
36 0x00020002,0x08021000,0x08001000,0x00021002,0x08021002,0x00020002,0x08000002,0x00000000,
37 0x08000000,0x00001002,0x00020000,0x08020002,0x00001000,0x08000000,0x00021002,0x08001002,
38 0x08021000,0x00001000,0x00000000,0x08000002,0x00000002,0x08021002,0x00021000,0x08020000,
39 0x08020002,0x00020000,0x00001002,0x08001000,0x08001002,0x00000002,0x08020000,0x00021000,
40 };
41
42 static long s2p[] = {
43 0x20800000,0x00808020,0x00000020,0x20800020,0x20008000,0x00800000,0x20800020,0x00008020,
44 0x00800020,0x00008000,0x00808000,0x20000000,0x20808020,0x20000020,0x20000000,0x20808000,
45 0x00000000,0x20008000,0x00808020,0x00000020,0x20000020,0x20808020,0x00008000,0x20800000,
46 0x20808000,0x00800020,0x20008020,0x00808000,0x00008020,0x00000000,0x00800000,0x20008020,
47 0x00808020,0x00000020,0x20000000,0x00008000,0x20000020,0x20008000,0x00808000,0x20800020,
48 0x00000000,0x00808020,0x00008020,0x20808000,0x20008000,0x00800000,0x20808020,0x20000000,
49 0x20008020,0x20800000,0x00800000,0x20808020,0x00008000,0x00800020,0x20800020,0x00008020,
50 0x00800020,0x00000000,0x20808000,0x20000020,0x20800000,0x20008020,0x00000020,0x00808000,
51 };
52
53 static long s3p[] = {
54 0x00080201,0x02000200,0x00000001,0x02080201,0x00000000,0x02080000,0x02000201,0x00080001,
55 0x02080200,0x02000001,0x02000000,0x00000201,0x02000001,0x00080201,0x00080000,0x02000000,
56 0x02080001,0x00080200,0x00000200,0x00000001,0x00080200,0x02000201,0x02080000,0x00000200,
57 0x00000201,0x00000000,0x00080001,0x02080200,0x02000200,0x02080001,0x02080201,0x00080000,
58 0x02080001,0x00000201,0x00080000,0x02000001,0x00080200,0x02000200,0x00000001,0x02080000,
59 0x02000201,0x00000000,0x00000200,0x00080001,0x00000000,0x02080001,0x02080200,0x00000200,
60 0x02000000,0x02080201,0x00080201,0x00080000,0x02080201,0x00000001,0x02000200,0x00080201,
61 0x00080001,0x00080200,0x02080000,0x02000201,0x00000201,0x02000000,0x02000001,0x02080200,
62 };
63
64 static long s4p[] = {
65 0x01000000,0x00002000,0x00000080,0x01002084,0x01002004,0x01000080,0x00002084,0x01002000,
66 0x00002000,0x00000004,0x01000004,0x00002080,0x01000084,0x01002004,0x01002080,0x00000000,
67 0x00002080,0x01000000,0x00002004,0x00000084,0x01000080,0x00002084,0x00000000,0x01000004,
68 0x00000004,0x01000084,0x01002084,0x00002004,0x01002000,0x00000080,0x00000084,0x01002080,
69 0x01002080,0x01000084,0x00002004,0x01002000,0x00002000,0x00000004,0x01000004,0x01000080,
70 0x01000000,0x00002080,0x01002084,0x00000000,0x00002084,0x01000000,0x00000080,0x00002004,
71 0x01000084,0x00000080,0x00000000,0x01002084,0x01002004,0x01002080,0x00000084,0x00002000,
72 0x00002080,0x01002004,0x01000080,0x00000084,0x00000004,0x00002084,0x01002000,0x01000004,
73 };
74
75 static long s5p[] = {
76 0x10000008,0x00040008,0x00000000,0x10040400,0x00040008,0x00000400,0x10000408,0x00040000,
77 0x00000408,0x10040408,0x00040400,0x10000000,0x10000400,0x10000008,0x10040000,0x00040408,
78 0x00040000,0x10000408,0x10040008,0x00000000,0x00000400,0x00000008,0x10040400,0x10040008,
79 0x10040408,0x10040000,0x10000000,0x00000408,0x00000008,0x00040400,0x00040408,0x10000400,
80 0x00000408,0x10000000,0x10000400,0x00040408,0x10040400,0x00040008,0x00000000,0x10000400,
81 0x10000000,0x00000400,0x10040008,0x00040000,0x00040008,0x10040408,0x00040400,0x00000008,
82 0x10040408,0x00040400,0x00040000,0x10000408,0x10000008,0x10040000,0x00040408,0x00000000,
83 0x00000400,0x10000008,0x10000408,0x10040400,0x10040000,0x00000408,0x00000008,0x10040008,
84 };
85
86 static long s6p[] = {
87 0x00000800,0x00000040,0x00200040,0x80200000,0x80200840,0x80000800,0x00000840,0x00000000,
88 0x00200000,0x80200040,0x80000040,0x00200800,0x80000000,0x00200840,0x00200800,0x80000040,
89 0x80200040,0x00000800,0x80000800,0x80200840,0x00000000,0x00200040,0x80200000,0x00000840,
90 0x80200800,0x80000840,0x00200840,0x80000000,0x80000840,0x80200800,0x00000040,0x00200000,
91 0x80000840,0x00200800,0x80200800,0x80000040,0x00000800,0x00000040,0x00200000,0x80200800,
92 0x80200040,0x80000840,0x00000840,0x00000000,0x00000040,0x80200000,0x80000000,0x00200040,
93 0x00000000,0x80200040,0x00200040,0x00000840,0x80000040,0x00000800,0x80200840,0x00200000,
94 0x00200840,0x80000000,0x80000800,0x80200840,0x80200000,0x00200840,0x00200800,0x80000800,
95 };
96
97 static long s7p[] = {
98 0x04100010,0x04104000,0x00004010,0x00000000,0x04004000,0x00100010,0x04100000,0x04104010,
99 0x00000010,0x04000000,0x00104000,0x00004010,0x00104010,0x04004010,0x04000010,0x04100000,
100 0x00004000,0x00104010,0x00100010,0x04004000,0x04104010,0x04000010,0x00000000,0x00104000,
101 0x04000000,0x00100000,0x04004010,0x04100010,0x00100000,0x00004000,0x04104000,0x00000010,
102 0x00100000,0x00004000,0x04000010,0x04104010,0x00004010,0x04000000,0x00000000,0x00104000,
103 0x04100010,0x04004010,0x04004000,0x00100010,0x04104000,0x00000010,0x00100010,0x04004000,
104 0x04104010,0x00100000,0x04100000,0x04000010,0x00104000,0x00004010,0x04004010,0x04100000,
105 0x00000010,0x04104000,0x00104010,0x00000000,0x04000000,0x04100010,0x00004000,0x00104010,
106 };
107
108 /*
109 * DES electronic codebook encryption of one block
110 */
111 void
block_cipher(char expanded_key[128],char text[8],int decrypting)112 block_cipher(char expanded_key[128], char text[8], int decrypting)
113 {
114 char *key;
115 long crypto, temp, right, left;
116 int i, key_offset;
117
118 key = expanded_key;
119 left = ip_low(text);
120 right = ip_high(text);
121 if (decrypting) {
122 key_offset = 16;
123 key = key + 128 - 8;
124 } else
125 key_offset = 0;
126 for (i = 0; i < 16; i++) {
127 temp = (right << 1) | ((right >> 31) & 1);
128 crypto = s0p[(temp & 0x3f) ^ *key++];
129 crypto |= s1p[((temp >> 4) & 0x3f) ^ *key++];
130 crypto |= s2p[((temp >> 8) & 0x3f) ^ *key++];
131 crypto |= s3p[((temp >> 12) & 0x3f) ^ *key++];
132 crypto |= s4p[((temp >> 16) & 0x3f) ^ *key++];
133 crypto |= s5p[((temp >> 20) & 0x3f) ^ *key++];
134 crypto |= s6p[((temp >> 24) & 0x3f) ^ *key++];
135 temp = ((right & 1) << 5) | ((right >> 27) & 0x1f);
136 crypto |= s7p[temp ^ *key++];
137 temp = left;
138 left = right;
139 right = temp ^ crypto;
140 key -= key_offset;
141 }
142 /*
143 * standard final permutation (IPI)
144 * left and right are reversed here
145 */
146 fp(right, left, text);
147 }
148
149 /*
150 * Initial Permutation
151 */
152 static long iptab[] = {
153 0x00000000, 0x00008000, 0x00000000, 0x00008000,
154 0x00000080, 0x00008080, 0x00000080, 0x00008080
155 };
156
157 static long
ip_low(char block[8])158 ip_low(char block[8])
159 {
160 int i;
161 long l;
162
163 l = 0;
164 for(i = 0; i < 8; i++){
165 l |= iptab[(block[i] >> 4) & 7] >> i;
166 l |= iptab[block[i] & 7] << (16 - i);
167 }
168 return l;
169 }
170
171 static long
ip_high(char block[8])172 ip_high(char block[8])
173 {
174 int i;
175 long l;
176
177 l = 0;
178 for(i = 0; i < 8; i++){
179 l |= iptab[(block[i] >> 5) & 7] >> i;
180 l |= iptab[(block[i] >> 1) & 7] << (16 - i);
181 }
182 return l;
183 }
184
185 /*
186 * Final Permutation
187 */
188 static unsigned long fptab[] = {
189 0x00000000,0x80000000,0x00800000,0x80800000,0x00008000,0x80008000,0x00808000,0x80808000,
190 0x00000080,0x80000080,0x00800080,0x80800080,0x00008080,0x80008080,0x00808080,0x80808080,
191 };
192
193 static void
fp(long left,long right,char text[8])194 fp(long left, long right, char text[8])
195 {
196 unsigned long ta[2], t, v[2];
197 int i, j, sh;
198
199 ta[0] = right;
200 ta[1] = left;
201 v[0] = v[1] = 0;
202 for(i = 0; i < 2; i++){
203 t = ta[i];
204 sh = i;
205 for(j = 0; j < 4; j++){
206 v[1] |= fptab[t & 0xf] >> sh;
207 t >>= 4;
208 v[0] |= fptab[t & 0xf] >> sh;
209 t >>= 4;
210 sh += 2;
211 }
212 }
213 for(i = 0; i < 2; i++)
214 for(j = 0; j < 4; j++){
215 *text++ = v[i];
216 v[i] >>= 8;
217 }
218 }
219
220 /*
221 * Key set-up
222 */
223 static uchar keyexpand[][15][2] = {
224 { 3, 2, 9, 8, 18, 8, 27, 32, 33, 2, 42, 16, 48, 8, 65, 16,
225 74, 2, 80, 2, 89, 4, 99, 16, 104, 4, 122, 32, 0, 0, },
226 { 1, 4, 8, 1, 18, 4, 25, 32, 34, 32, 41, 8, 50, 8, 59, 32,
227 64, 16, 75, 4, 90, 1, 97, 16, 106, 2, 112, 2, 123, 1, },
228 { 2, 1, 19, 8, 35, 1, 40, 1, 50, 4, 57, 32, 75, 2, 80, 32,
229 89, 1, 96, 16, 107, 4, 120, 8, 0, 0, 0, 0, 0, 0, },
230 { 4, 32, 20, 2, 31, 4, 37, 32, 47, 1, 54, 1, 63, 2, 68, 1,
231 78, 4, 84, 8, 101, 16, 108, 4, 119, 16, 126, 8, 0, 0, },
232 { 5, 4, 15, 4, 21, 32, 31, 1, 38, 1, 47, 2, 53, 2, 68, 8,
233 85, 16, 92, 4, 103, 16, 108, 32, 118, 32, 124, 2, 0, 0, },
234 { 15, 2, 21, 2, 39, 8, 46, 16, 55, 32, 61, 1, 71, 16, 76, 32,
235 86, 32, 93, 4, 102, 2, 108, 16, 117, 8, 126, 1, 0, 0, },
236 { 14, 16, 23, 32, 29, 1, 38, 8, 52, 2, 63, 4, 70, 2, 76, 16,
237 85, 8, 100, 1, 110, 4, 116, 8, 127, 8, 0, 0, 0, 0, },
238 { 1, 8, 8, 32, 17, 1, 24, 16, 35, 4, 50, 1, 57, 16, 67, 8,
239 83, 1, 88, 1, 98, 4, 105, 32, 114, 32, 123, 2, 0, 0, },
240 { 0, 1, 11, 16, 16, 4, 35, 2, 40, 32, 49, 1, 56, 16, 65, 2,
241 74, 16, 80, 8, 99, 8, 115, 1, 121, 4, 0, 0, 0, 0, },
242 { 9, 16, 18, 2, 24, 2, 33, 4, 43, 16, 48, 4, 66, 32, 73, 8,
243 82, 8, 91, 32, 97, 2, 106, 16, 112, 8, 122, 1, 0, 0, },
244 { 14, 32, 21, 4, 30, 2, 36, 16, 45, 8, 60, 1, 69, 2, 87, 8,
245 94, 16, 103, 32, 109, 1, 118, 8, 124, 32, 0, 0, 0, 0, },
246 { 7, 4, 14, 2, 20, 16, 29, 8, 44, 1, 54, 4, 60, 8, 71, 8,
247 78, 16, 87, 32, 93, 1, 102, 8, 116, 2, 125, 4, 0, 0, },
248 { 7, 2, 12, 1, 22, 4, 28, 8, 45, 16, 52, 4, 63, 16, 70, 8,
249 84, 2, 95, 4, 101, 32, 111, 1, 118, 1, 0, 0, 0, 0, },
250 { 6, 16, 13, 16, 20, 4, 31, 16, 36, 32, 46, 32, 53, 4, 62, 2,
251 69, 32, 79, 1, 86, 1, 95, 2, 101, 2, 119, 8, 0, 0, },
252 { 0, 32, 10, 8, 19, 32, 25, 2, 34, 16, 40, 8, 59, 8, 66, 2,
253 72, 2, 81, 4, 91, 16, 96, 4, 115, 2, 121, 8, 0, 0, },
254 { 3, 16, 10, 4, 17, 32, 26, 32, 33, 8, 42, 8, 51, 32, 57, 2,
255 67, 4, 82, 1, 89, 16, 98, 2, 104, 2, 113, 4, 120, 1, },
256 { 1, 16, 11, 8, 27, 1, 32, 1, 42, 4, 49, 32, 58, 32, 67, 2,
257 72, 32, 81, 1, 88, 16, 99, 4, 114, 1, 0, 0, 0, 0, },
258 { 6, 32, 12, 2, 23, 4, 29, 32, 39, 1, 46, 1, 55, 2, 61, 2,
259 70, 4, 76, 8, 93, 16, 100, 4, 111, 16, 116, 32, 0, 0, },
260 { 6, 2, 13, 32, 23, 1, 30, 1, 39, 2, 45, 2, 63, 8, 77, 16,
261 84, 4, 95, 16, 100, 32, 110, 32, 117, 4, 127, 4, 0, 0, },
262 { 4, 1, 13, 2, 31, 8, 38, 16, 47, 32, 53, 1, 62, 8, 68, 32,
263 78, 32, 85, 4, 94, 2, 100, 16, 109, 8, 127, 2, 0, 0, },
264 { 5, 16, 15, 32, 21, 1, 30, 8, 44, 2, 55, 4, 61, 32, 68, 16,
265 77, 8, 92, 1, 102, 4, 108, 8, 126, 16, 0, 0, 0, 0, },
266 { 2, 8, 9, 1, 16, 16, 27, 4, 42, 1, 49, 16, 58, 2, 75, 1,
267 80, 1, 90, 4, 97, 32, 106, 32, 113, 8, 120, 32, 0, 0, },
268 { 2, 4, 8, 4, 27, 2, 32, 32, 41, 1, 48, 16, 59, 4, 66, 16,
269 72, 8, 91, 8, 107, 1, 112, 1, 123, 16, 0, 0, 0, 0, },
270 { 3, 8, 10, 2, 16, 2, 25, 4, 35, 16, 40, 4, 59, 2, 65, 8,
271 74, 8, 83, 32, 89, 2, 98, 16, 104, 8, 121, 16, 0, 0, },
272 { 4, 2, 13, 4, 22, 2, 28, 16, 37, 8, 52, 1, 62, 4, 79, 8,
273 86, 16, 95, 32, 101, 1, 110, 8, 126, 32, 0, 0, 0, 0, },
274 { 5, 32, 12, 16, 21, 8, 36, 1, 46, 4, 52, 8, 70, 16, 79, 32,
275 85, 1, 94, 8, 108, 2, 119, 4, 126, 2, 0, 0, 0, 0, },
276 { 5, 2, 14, 4, 20, 8, 37, 16, 44, 4, 55, 16, 60, 32, 76, 2,
277 87, 4, 93, 32, 103, 1, 110, 1, 119, 2, 124, 1, 0, 0, },
278 { 7, 32, 12, 4, 23, 16, 28, 32, 38, 32, 45, 4, 54, 2, 60, 16,
279 71, 1, 78, 1, 87, 2, 93, 2, 111, 8, 118, 16, 125, 16, },
280 { 1, 1, 11, 32, 17, 2, 26, 16, 32, 8, 51, 8, 64, 2, 73, 4,
281 83, 16, 88, 4, 107, 2, 112, 32, 122, 8, 0, 0, 0, 0, },
282 { 0, 4, 9, 32, 18, 32, 25, 8, 34, 8, 43, 32, 49, 2, 58, 16,
283 74, 1, 81, 16, 90, 2, 96, 2, 105, 4, 115, 16, 122, 4, },
284 { 2, 2, 19, 1, 24, 1, 34, 4, 41, 32, 50, 32, 57, 8, 64, 32,
285 73, 1, 80, 16, 91, 4, 106, 1, 113, 16, 123, 8, 0, 0, },
286 { 3, 4, 10, 16, 16, 8, 35, 8, 51, 1, 56, 1, 67, 16, 72, 4,
287 91, 2, 96, 32, 105, 1, 112, 16, 121, 2, 0, 0, 0, 0, },
288 { 4, 16, 15, 1, 22, 1, 31, 2, 37, 2, 55, 8, 62, 16, 69, 16,
289 76, 4, 87, 16, 92, 32, 102, 32, 109, 4, 118, 2, 125, 32, },
290 { 6, 4, 23, 8, 30, 16, 39, 32, 45, 1, 54, 8, 70, 32, 77, 4,
291 86, 2, 92, 16, 101, 8, 116, 1, 125, 2, 0, 0, 0, 0, },
292 { 4, 4, 13, 1, 22, 8, 36, 2, 47, 4, 53, 32, 63, 1, 69, 8,
293 84, 1, 94, 4, 100, 8, 117, 16, 127, 32, 0, 0, 0, 0, },
294 { 3, 32, 8, 16, 19, 4, 34, 1, 41, 16, 50, 2, 56, 2, 67, 1,
295 72, 1, 82, 4, 89, 32, 98, 32, 105, 8, 114, 8, 121, 1, },
296 { 1, 32, 19, 2, 24, 32, 33, 1, 40, 16, 51, 4, 64, 8, 83, 8,
297 99, 1, 104, 1, 114, 4, 120, 4, 0, 0, 0, 0, 0, 0, },
298 { 8, 2, 17, 4, 27, 16, 32, 4, 51, 2, 56, 32, 66, 8, 75, 32,
299 81, 2, 90, 16, 96, 8, 115, 8, 122, 2, 0, 0, 0, 0, },
300 { 2, 16, 18, 1, 25, 16, 34, 2, 40, 2, 49, 4, 59, 16, 66, 4,
301 73, 32, 82, 32, 89, 8, 98, 8, 107, 32, 113, 2, 123, 4, },
302 { 7, 1, 13, 8, 28, 1, 38, 4, 44, 8, 61, 16, 71, 32, 77, 1,
303 86, 8, 100, 2, 111, 4, 117, 32, 124, 16, 0, 0, 0, 0, },
304 { 12, 8, 29, 16, 36, 4, 47, 16, 52, 32, 62, 32, 68, 2, 79, 4,
305 85, 32, 95, 1, 102, 1, 111, 2, 117, 2, 126, 4, 0, 0, },
306 { 5, 1, 15, 16, 20, 32, 30, 32, 37, 4, 46, 2, 52, 16, 61, 8,
307 70, 1, 79, 2, 85, 2, 103, 8, 110, 16, 119, 32, 124, 4, },
308 { 0, 16, 9, 2, 18, 16, 24, 8, 43, 8, 59, 1, 65, 4, 75, 16,
309 80, 4, 99, 2, 104, 32, 113, 1, 123, 32, 0, 0, 0, 0, },
310 { 10, 32, 17, 8, 26, 8, 35, 32, 41, 2, 50, 16, 56, 8, 66, 1,
311 73, 16, 82, 2, 88, 2, 97, 4, 107, 16, 112, 4, 121, 32, },
312 { 0, 2, 11, 1, 16, 1, 26, 4, 33, 32, 42, 32, 49, 8, 58, 8,
313 65, 1, 72, 16, 83, 4, 98, 1, 105, 16, 114, 2, 0, 0, },
314 { 8, 8, 27, 8, 43, 1, 48, 1, 58, 4, 64, 4, 83, 2, 88, 32,
315 97, 1, 104, 16, 115, 4, 122, 16, 0, 0, 0, 0, 0, 0, },
316 { 5, 8, 14, 1, 23, 2, 29, 2, 47, 8, 54, 16, 63, 32, 68, 4,
317 79, 16, 84, 32, 94, 32, 101, 4, 110, 2, 116, 16, 127, 1, },
318 { 4, 8, 15, 8, 22, 16, 31, 32, 37, 1, 46, 8, 60, 2, 69, 4,
319 78, 2, 84, 16, 93, 8, 108, 1, 118, 4, 0, 0, 0, 0, },
320 { 7, 16, 14, 8, 28, 2, 39, 4, 45, 32, 55, 1, 62, 1, 76, 1,
321 86, 4, 92, 8, 109, 16, 116, 4, 125, 1, 0, 0, 0, 0, },
322 { 1, 2, 11, 4, 26, 1, 33, 16, 42, 2, 48, 2, 57, 4, 64, 1,
323 74, 4, 81, 32, 90, 32, 97, 8, 106, 8, 115, 32, 120, 16, },
324 { 2, 32, 11, 2, 16, 32, 25, 1, 32, 16, 43, 4, 58, 1, 75, 8,
325 91, 1, 96, 1, 106, 4, 113, 32, 0, 0, 0, 0, 0, 0, },
326 { 3, 1, 9, 4, 19, 16, 24, 4, 43, 2, 48, 32, 57, 1, 67, 32,
327 73, 2, 82, 16, 88, 8, 107, 8, 120, 2, 0, 0, 0, 0, },
328 { 0, 8, 10, 1, 17, 16, 26, 2, 32, 2, 41, 4, 51, 16, 56, 4,
329 65, 32, 74, 32, 81, 8, 90, 8, 99, 32, 105, 2, 114, 16, },
330 { 6, 1, 20, 1, 30, 4, 36, 8, 53, 16, 60, 4, 69, 1, 78, 8,
331 92, 2, 103, 4, 109, 32, 119, 1, 125, 8, 0, 0, 0, 0, },
332 { 7, 8, 21, 16, 28, 4, 39, 16, 44, 32, 54, 32, 61, 4, 71, 4,
333 77, 32, 87, 1, 94, 1, 103, 2, 109, 2, 124, 8, 0, 0, },
334 { 6, 8, 12, 32, 22, 32, 29, 4, 38, 2, 44, 16, 53, 8, 71, 2,
335 77, 2, 95, 8, 102, 16, 111, 32, 117, 1, 127, 16, 0, 0, }
336 };
337
338 void
key_setup(char key[DESKEYLEN],char * ek)339 key_setup(char key[DESKEYLEN], char *ek)
340 {
341 int i, j, k, mask;
342 uchar (*x)[2];
343
344 memset(ek, 0, 128);
345 x = keyexpand[0];
346 for(i = 0; i < 7; i++){
347 k = key[i];
348 for(mask = 0x80; mask; mask >>= 1){
349 if(k & mask)
350 for(j = 0; j < 15; j++)
351 ek[x[j][0]] |= x[j][1];
352 x += 15;
353 }
354 }
355 }
356