374330e2 |
1 | #include <assert.h> |
2 | #include "ssh.h" |
3 | |
4 | /* |
5 | |
6 | DES implementation; 1995 Tatu Ylonen <ylo@cs.hut.fi> |
7 | |
8 | This implementation is derived from libdes-3.06, which is copyright |
9 | (c) 1993 Eric Young, and distributed under the GNU GPL or the ARTISTIC licence |
10 | (at the user's option). The original distribution can be found e.g. from |
11 | ftp://ftp.dsi.unimi.it/pub/security/crypt/libdes/libdes-3.06.tar.gz. |
12 | |
13 | This implementation is distributed under the same terms. See |
14 | libdes-README, libdes-ARTISTIC, and libdes-COPYING for more |
15 | information. |
16 | |
17 | */ |
18 | |
374330e2 |
19 | typedef struct |
20 | { |
21 | word32 key_schedule[32]; |
22 | } DESContext; |
23 | |
24 | /* Sets the des key for the context. Initializes the context. The least |
25 | significant bit of each byte of the key is ignored as parity. */ |
26 | static void des_set_key(unsigned char *key, DESContext *ks); |
27 | |
28 | /* Encrypts 32 bits in l,r, and stores the result in output[0] and output[1]. |
29 | Performs encryption if encrypt is non-zero, and decryption if it is zero. |
30 | The key context must have been initialized previously with des_set_key. */ |
31 | static void des_encrypt(word32 l, word32 r, word32 *output, DESContext *ks, |
32 | int encrypt); |
33 | |
34 | /* Encrypts len bytes from src to dest in CBC modes. Len must be a multiple |
35 | of 8. iv will be modified at end to a value suitable for continuing |
36 | encryption. */ |
37 | static void des_cbc_encrypt(DESContext *ks, unsigned char *iv, unsigned char *dest, |
38 | const unsigned char *src, unsigned int len); |
39 | |
40 | /* Decrypts len bytes from src to dest in CBC modes. Len must be a multiple |
41 | of 8. iv will be modified at end to a value suitable for continuing |
42 | decryption. */ |
43 | static void des_cbc_decrypt(DESContext *ks, unsigned char *iv, unsigned char *dest, |
44 | const unsigned char *src, unsigned int len); |
45 | |
46 | /* Encrypts in CBC mode using triple-DES. */ |
47 | static void des_3cbc_encrypt(DESContext *ks1, unsigned char *iv1, |
48 | DESContext *ks2, unsigned char *iv2, |
49 | DESContext *ks3, unsigned char *iv3, |
50 | unsigned char *dest, const unsigned char *src, |
51 | unsigned int len); |
52 | |
53 | /* Decrypts in CBC mode using triple-DES. */ |
54 | static void des_3cbc_decrypt(DESContext *ks1, unsigned char *iv1, |
55 | DESContext *ks2, unsigned char *iv2, |
56 | DESContext *ks3, unsigned char *iv3, |
57 | unsigned char *dest, const unsigned char *src, |
58 | unsigned int len); |
59 | |
60 | #define GET_32BIT_LSB_FIRST(cp) \ |
61 | (((unsigned long)(unsigned char)(cp)[0]) | \ |
62 | ((unsigned long)(unsigned char)(cp)[1] << 8) | \ |
63 | ((unsigned long)(unsigned char)(cp)[2] << 16) | \ |
64 | ((unsigned long)(unsigned char)(cp)[3] << 24)) |
65 | |
66 | #define PUT_32BIT_LSB_FIRST(cp, value) do { \ |
67 | (cp)[0] = (value); \ |
68 | (cp)[1] = (value) >> 8; \ |
69 | (cp)[2] = (value) >> 16; \ |
70 | (cp)[3] = (value) >> 24; } while (0) |
71 | |
72 | /* |
73 | |
74 | DES implementation; 1995 Tatu Ylonen <ylo@cs.hut.fi> |
75 | |
76 | This implementation is derived from libdes-3.06, which is copyright |
77 | (c) 1993 Eric Young, and distributed under the GNU GPL or the ARTISTIC licence |
78 | (at the user's option). The original distribution can be found e.g. from |
79 | ftp://ftp.dsi.unimi.it/pub/security/crypt/libdes/libdes-3.06.tar.gz. |
80 | |
81 | This implementation is distributed under the same terms. See |
82 | libdes-README, libdes-ARTISTIC, and libdes-COPYING for more |
83 | information. |
84 | |
85 | A description of the DES algorithm can be found in every modern book on |
86 | cryptography and data security, including the following: |
87 | |
88 | Bruce Schneier: Applied Cryptography. John Wiley & Sons, 1994. |
89 | |
90 | Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to |
91 | Computer Security. Prentice-Hall, 1989. |
92 | |
93 | Man Young Rhee: Cryptography and Secure Data Communications. McGraw-Hill, |
94 | 1994. |
95 | |
96 | */ |
97 | |
374330e2 |
98 | /* Table for key generation. This used to be in sk.h. */ |
99 | /* Copyright (C) 1993 Eric Young - see README for more details */ |
100 | static const word32 des_skb[8][64]={ |
101 | /* for C bits (numbered as per FIPS 46) 1 2 3 4 5 6 */ |
102 | { 0x00000000,0x00000010,0x20000000,0x20000010, |
103 | 0x00010000,0x00010010,0x20010000,0x20010010, |
104 | 0x00000800,0x00000810,0x20000800,0x20000810, |
105 | 0x00010800,0x00010810,0x20010800,0x20010810, |
106 | 0x00000020,0x00000030,0x20000020,0x20000030, |
107 | 0x00010020,0x00010030,0x20010020,0x20010030, |
108 | 0x00000820,0x00000830,0x20000820,0x20000830, |
109 | 0x00010820,0x00010830,0x20010820,0x20010830, |
110 | 0x00080000,0x00080010,0x20080000,0x20080010, |
111 | 0x00090000,0x00090010,0x20090000,0x20090010, |
112 | 0x00080800,0x00080810,0x20080800,0x20080810, |
113 | 0x00090800,0x00090810,0x20090800,0x20090810, |
114 | 0x00080020,0x00080030,0x20080020,0x20080030, |
115 | 0x00090020,0x00090030,0x20090020,0x20090030, |
116 | 0x00080820,0x00080830,0x20080820,0x20080830, |
117 | 0x00090820,0x00090830,0x20090820,0x20090830 }, |
118 | /* for C bits (numbered as per FIPS 46) 7 8 10 11 12 13 */ |
119 | { 0x00000000,0x02000000,0x00002000,0x02002000, |
120 | 0x00200000,0x02200000,0x00202000,0x02202000, |
121 | 0x00000004,0x02000004,0x00002004,0x02002004, |
122 | 0x00200004,0x02200004,0x00202004,0x02202004, |
123 | 0x00000400,0x02000400,0x00002400,0x02002400, |
124 | 0x00200400,0x02200400,0x00202400,0x02202400, |
125 | 0x00000404,0x02000404,0x00002404,0x02002404, |
126 | 0x00200404,0x02200404,0x00202404,0x02202404, |
127 | 0x10000000,0x12000000,0x10002000,0x12002000, |
128 | 0x10200000,0x12200000,0x10202000,0x12202000, |
129 | 0x10000004,0x12000004,0x10002004,0x12002004, |
130 | 0x10200004,0x12200004,0x10202004,0x12202004, |
131 | 0x10000400,0x12000400,0x10002400,0x12002400, |
132 | 0x10200400,0x12200400,0x10202400,0x12202400, |
133 | 0x10000404,0x12000404,0x10002404,0x12002404, |
134 | 0x10200404,0x12200404,0x10202404,0x12202404 }, |
135 | /* for C bits (numbered as per FIPS 46) 14 15 16 17 19 20 */ |
136 | { 0x00000000,0x00000001,0x00040000,0x00040001, |
137 | 0x01000000,0x01000001,0x01040000,0x01040001, |
138 | 0x00000002,0x00000003,0x00040002,0x00040003, |
139 | 0x01000002,0x01000003,0x01040002,0x01040003, |
140 | 0x00000200,0x00000201,0x00040200,0x00040201, |
141 | 0x01000200,0x01000201,0x01040200,0x01040201, |
142 | 0x00000202,0x00000203,0x00040202,0x00040203, |
143 | 0x01000202,0x01000203,0x01040202,0x01040203, |
144 | 0x08000000,0x08000001,0x08040000,0x08040001, |
145 | 0x09000000,0x09000001,0x09040000,0x09040001, |
146 | 0x08000002,0x08000003,0x08040002,0x08040003, |
147 | 0x09000002,0x09000003,0x09040002,0x09040003, |
148 | 0x08000200,0x08000201,0x08040200,0x08040201, |
149 | 0x09000200,0x09000201,0x09040200,0x09040201, |
150 | 0x08000202,0x08000203,0x08040202,0x08040203, |
151 | 0x09000202,0x09000203,0x09040202,0x09040203 }, |
152 | /* for C bits (numbered as per FIPS 46) 21 23 24 26 27 28 */ |
153 | { 0x00000000,0x00100000,0x00000100,0x00100100, |
154 | 0x00000008,0x00100008,0x00000108,0x00100108, |
155 | 0x00001000,0x00101000,0x00001100,0x00101100, |
156 | 0x00001008,0x00101008,0x00001108,0x00101108, |
157 | 0x04000000,0x04100000,0x04000100,0x04100100, |
158 | 0x04000008,0x04100008,0x04000108,0x04100108, |
159 | 0x04001000,0x04101000,0x04001100,0x04101100, |
160 | 0x04001008,0x04101008,0x04001108,0x04101108, |
161 | 0x00020000,0x00120000,0x00020100,0x00120100, |
162 | 0x00020008,0x00120008,0x00020108,0x00120108, |
163 | 0x00021000,0x00121000,0x00021100,0x00121100, |
164 | 0x00021008,0x00121008,0x00021108,0x00121108, |
165 | 0x04020000,0x04120000,0x04020100,0x04120100, |
166 | 0x04020008,0x04120008,0x04020108,0x04120108, |
167 | 0x04021000,0x04121000,0x04021100,0x04121100, |
168 | 0x04021008,0x04121008,0x04021108,0x04121108 }, |
169 | /* for D bits (numbered as per FIPS 46) 1 2 3 4 5 6 */ |
170 | { 0x00000000,0x10000000,0x00010000,0x10010000, |
171 | 0x00000004,0x10000004,0x00010004,0x10010004, |
172 | 0x20000000,0x30000000,0x20010000,0x30010000, |
173 | 0x20000004,0x30000004,0x20010004,0x30010004, |
174 | 0x00100000,0x10100000,0x00110000,0x10110000, |
175 | 0x00100004,0x10100004,0x00110004,0x10110004, |
176 | 0x20100000,0x30100000,0x20110000,0x30110000, |
177 | 0x20100004,0x30100004,0x20110004,0x30110004, |
178 | 0x00001000,0x10001000,0x00011000,0x10011000, |
179 | 0x00001004,0x10001004,0x00011004,0x10011004, |
180 | 0x20001000,0x30001000,0x20011000,0x30011000, |
181 | 0x20001004,0x30001004,0x20011004,0x30011004, |
182 | 0x00101000,0x10101000,0x00111000,0x10111000, |
183 | 0x00101004,0x10101004,0x00111004,0x10111004, |
184 | 0x20101000,0x30101000,0x20111000,0x30111000, |
185 | 0x20101004,0x30101004,0x20111004,0x30111004 }, |
186 | /* for D bits (numbered as per FIPS 46) 8 9 11 12 13 14 */ |
187 | { 0x00000000,0x08000000,0x00000008,0x08000008, |
188 | 0x00000400,0x08000400,0x00000408,0x08000408, |
189 | 0x00020000,0x08020000,0x00020008,0x08020008, |
190 | 0x00020400,0x08020400,0x00020408,0x08020408, |
191 | 0x00000001,0x08000001,0x00000009,0x08000009, |
192 | 0x00000401,0x08000401,0x00000409,0x08000409, |
193 | 0x00020001,0x08020001,0x00020009,0x08020009, |
194 | 0x00020401,0x08020401,0x00020409,0x08020409, |
195 | 0x02000000,0x0A000000,0x02000008,0x0A000008, |
196 | 0x02000400,0x0A000400,0x02000408,0x0A000408, |
197 | 0x02020000,0x0A020000,0x02020008,0x0A020008, |
198 | 0x02020400,0x0A020400,0x02020408,0x0A020408, |
199 | 0x02000001,0x0A000001,0x02000009,0x0A000009, |
200 | 0x02000401,0x0A000401,0x02000409,0x0A000409, |
201 | 0x02020001,0x0A020001,0x02020009,0x0A020009, |
202 | 0x02020401,0x0A020401,0x02020409,0x0A020409 }, |
203 | /* for D bits (numbered as per FIPS 46) 16 17 18 19 20 21 */ |
204 | { 0x00000000,0x00000100,0x00080000,0x00080100, |
205 | 0x01000000,0x01000100,0x01080000,0x01080100, |
206 | 0x00000010,0x00000110,0x00080010,0x00080110, |
207 | 0x01000010,0x01000110,0x01080010,0x01080110, |
208 | 0x00200000,0x00200100,0x00280000,0x00280100, |
209 | 0x01200000,0x01200100,0x01280000,0x01280100, |
210 | 0x00200010,0x00200110,0x00280010,0x00280110, |
211 | 0x01200010,0x01200110,0x01280010,0x01280110, |
212 | 0x00000200,0x00000300,0x00080200,0x00080300, |
213 | 0x01000200,0x01000300,0x01080200,0x01080300, |
214 | 0x00000210,0x00000310,0x00080210,0x00080310, |
215 | 0x01000210,0x01000310,0x01080210,0x01080310, |
216 | 0x00200200,0x00200300,0x00280200,0x00280300, |
217 | 0x01200200,0x01200300,0x01280200,0x01280300, |
218 | 0x00200210,0x00200310,0x00280210,0x00280310, |
219 | 0x01200210,0x01200310,0x01280210,0x01280310 }, |
220 | /* for D bits (numbered as per FIPS 46) 22 23 24 25 27 28 */ |
221 | { 0x00000000,0x04000000,0x00040000,0x04040000, |
222 | 0x00000002,0x04000002,0x00040002,0x04040002, |
223 | 0x00002000,0x04002000,0x00042000,0x04042000, |
224 | 0x00002002,0x04002002,0x00042002,0x04042002, |
225 | 0x00000020,0x04000020,0x00040020,0x04040020, |
226 | 0x00000022,0x04000022,0x00040022,0x04040022, |
227 | 0x00002020,0x04002020,0x00042020,0x04042020, |
228 | 0x00002022,0x04002022,0x00042022,0x04042022, |
229 | 0x00000800,0x04000800,0x00040800,0x04040800, |
230 | 0x00000802,0x04000802,0x00040802,0x04040802, |
231 | 0x00002800,0x04002800,0x00042800,0x04042800, |
232 | 0x00002802,0x04002802,0x00042802,0x04042802, |
233 | 0x00000820,0x04000820,0x00040820,0x04040820, |
234 | 0x00000822,0x04000822,0x00040822,0x04040822, |
235 | 0x00002820,0x04002820,0x00042820,0x04042820, |
236 | 0x00002822,0x04002822,0x00042822,0x04042822 } |
237 | }; |
238 | |
239 | /* Tables used for executing des. This used to be in spr.h. */ |
240 | /* Copyright (C) 1993 Eric Young - see README for more details */ |
241 | static const word32 des_SPtrans[8][64]={ |
242 | /* nibble 0 */ |
243 | { 0x00820200, 0x00020000, 0x80800000, 0x80820200, |
244 | 0x00800000, 0x80020200, 0x80020000, 0x80800000, |
245 | 0x80020200, 0x00820200, 0x00820000, 0x80000200, |
246 | 0x80800200, 0x00800000, 0x00000000, 0x80020000, |
247 | 0x00020000, 0x80000000, 0x00800200, 0x00020200, |
248 | 0x80820200, 0x00820000, 0x80000200, 0x00800200, |
249 | 0x80000000, 0x00000200, 0x00020200, 0x80820000, |
250 | 0x00000200, 0x80800200, 0x80820000, 0x00000000, |
251 | 0x00000000, 0x80820200, 0x00800200, 0x80020000, |
252 | 0x00820200, 0x00020000, 0x80000200, 0x00800200, |
253 | 0x80820000, 0x00000200, 0x00020200, 0x80800000, |
254 | 0x80020200, 0x80000000, 0x80800000, 0x00820000, |
255 | 0x80820200, 0x00020200, 0x00820000, 0x80800200, |
256 | 0x00800000, 0x80000200, 0x80020000, 0x00000000, |
257 | 0x00020000, 0x00800000, 0x80800200, 0x00820200, |
258 | 0x80000000, 0x80820000, 0x00000200, 0x80020200 }, |
259 | |
260 | /* nibble 1 */ |
261 | { 0x10042004, 0x00000000, 0x00042000, 0x10040000, |
262 | 0x10000004, 0x00002004, 0x10002000, 0x00042000, |
263 | 0x00002000, 0x10040004, 0x00000004, 0x10002000, |
264 | 0x00040004, 0x10042000, 0x10040000, 0x00000004, |
265 | 0x00040000, 0x10002004, 0x10040004, 0x00002000, |
266 | 0x00042004, 0x10000000, 0x00000000, 0x00040004, |
267 | 0x10002004, 0x00042004, 0x10042000, 0x10000004, |
268 | 0x10000000, 0x00040000, 0x00002004, 0x10042004, |
269 | 0x00040004, 0x10042000, 0x10002000, 0x00042004, |
270 | 0x10042004, 0x00040004, 0x10000004, 0x00000000, |
271 | 0x10000000, 0x00002004, 0x00040000, 0x10040004, |
272 | 0x00002000, 0x10000000, 0x00042004, 0x10002004, |
273 | 0x10042000, 0x00002000, 0x00000000, 0x10000004, |
274 | 0x00000004, 0x10042004, 0x00042000, 0x10040000, |
275 | 0x10040004, 0x00040000, 0x00002004, 0x10002000, |
276 | 0x10002004, 0x00000004, 0x10040000, 0x00042000 }, |
277 | |
278 | /* nibble 2 */ |
279 | { 0x41000000, 0x01010040, 0x00000040, 0x41000040, |
280 | 0x40010000, 0x01000000, 0x41000040, 0x00010040, |
281 | 0x01000040, 0x00010000, 0x01010000, 0x40000000, |
282 | 0x41010040, 0x40000040, 0x40000000, 0x41010000, |
283 | 0x00000000, 0x40010000, 0x01010040, 0x00000040, |
284 | 0x40000040, 0x41010040, 0x00010000, 0x41000000, |
285 | 0x41010000, 0x01000040, 0x40010040, 0x01010000, |
286 | 0x00010040, 0x00000000, 0x01000000, 0x40010040, |
287 | 0x01010040, 0x00000040, 0x40000000, 0x00010000, |
288 | 0x40000040, 0x40010000, 0x01010000, 0x41000040, |
289 | 0x00000000, 0x01010040, 0x00010040, 0x41010000, |
290 | 0x40010000, 0x01000000, 0x41010040, 0x40000000, |
291 | 0x40010040, 0x41000000, 0x01000000, 0x41010040, |
292 | 0x00010000, 0x01000040, 0x41000040, 0x00010040, |
293 | 0x01000040, 0x00000000, 0x41010000, 0x40000040, |
294 | 0x41000000, 0x40010040, 0x00000040, 0x01010000 }, |
295 | |
296 | /* nibble 3 */ |
297 | { 0x00100402, 0x04000400, 0x00000002, 0x04100402, |
298 | 0x00000000, 0x04100000, 0x04000402, 0x00100002, |
299 | 0x04100400, 0x04000002, 0x04000000, 0x00000402, |
300 | 0x04000002, 0x00100402, 0x00100000, 0x04000000, |
301 | 0x04100002, 0x00100400, 0x00000400, 0x00000002, |
302 | 0x00100400, 0x04000402, 0x04100000, 0x00000400, |
303 | 0x00000402, 0x00000000, 0x00100002, 0x04100400, |
304 | 0x04000400, 0x04100002, 0x04100402, 0x00100000, |
305 | 0x04100002, 0x00000402, 0x00100000, 0x04000002, |
306 | 0x00100400, 0x04000400, 0x00000002, 0x04100000, |
307 | 0x04000402, 0x00000000, 0x00000400, 0x00100002, |
308 | 0x00000000, 0x04100002, 0x04100400, 0x00000400, |
309 | 0x04000000, 0x04100402, 0x00100402, 0x00100000, |
310 | 0x04100402, 0x00000002, 0x04000400, 0x00100402, |
311 | 0x00100002, 0x00100400, 0x04100000, 0x04000402, |
312 | 0x00000402, 0x04000000, 0x04000002, 0x04100400 }, |
313 | |
314 | /* nibble 4 */ |
315 | { 0x02000000, 0x00004000, 0x00000100, 0x02004108, |
316 | 0x02004008, 0x02000100, 0x00004108, 0x02004000, |
317 | 0x00004000, 0x00000008, 0x02000008, 0x00004100, |
318 | 0x02000108, 0x02004008, 0x02004100, 0x00000000, |
319 | 0x00004100, 0x02000000, 0x00004008, 0x00000108, |
320 | 0x02000100, 0x00004108, 0x00000000, 0x02000008, |
321 | 0x00000008, 0x02000108, 0x02004108, 0x00004008, |
322 | 0x02004000, 0x00000100, 0x00000108, 0x02004100, |
323 | 0x02004100, 0x02000108, 0x00004008, 0x02004000, |
324 | 0x00004000, 0x00000008, 0x02000008, 0x02000100, |
325 | 0x02000000, 0x00004100, 0x02004108, 0x00000000, |
326 | 0x00004108, 0x02000000, 0x00000100, 0x00004008, |
327 | 0x02000108, 0x00000100, 0x00000000, 0x02004108, |
328 | 0x02004008, 0x02004100, 0x00000108, 0x00004000, |
329 | 0x00004100, 0x02004008, 0x02000100, 0x00000108, |
330 | 0x00000008, 0x00004108, 0x02004000, 0x02000008 }, |
331 | |
332 | /* nibble 5 */ |
333 | { 0x20000010, 0x00080010, 0x00000000, 0x20080800, |
334 | 0x00080010, 0x00000800, 0x20000810, 0x00080000, |
335 | 0x00000810, 0x20080810, 0x00080800, 0x20000000, |
336 | 0x20000800, 0x20000010, 0x20080000, 0x00080810, |
337 | 0x00080000, 0x20000810, 0x20080010, 0x00000000, |
338 | 0x00000800, 0x00000010, 0x20080800, 0x20080010, |
339 | 0x20080810, 0x20080000, 0x20000000, 0x00000810, |
340 | 0x00000010, 0x00080800, 0x00080810, 0x20000800, |
341 | 0x00000810, 0x20000000, 0x20000800, 0x00080810, |
342 | 0x20080800, 0x00080010, 0x00000000, 0x20000800, |
343 | 0x20000000, 0x00000800, 0x20080010, 0x00080000, |
344 | 0x00080010, 0x20080810, 0x00080800, 0x00000010, |
345 | 0x20080810, 0x00080800, 0x00080000, 0x20000810, |
346 | 0x20000010, 0x20080000, 0x00080810, 0x00000000, |
347 | 0x00000800, 0x20000010, 0x20000810, 0x20080800, |
348 | 0x20080000, 0x00000810, 0x00000010, 0x20080010 }, |
349 | |
350 | /* nibble 6 */ |
351 | { 0x00001000, 0x00000080, 0x00400080, 0x00400001, |
352 | 0x00401081, 0x00001001, 0x00001080, 0x00000000, |
353 | 0x00400000, 0x00400081, 0x00000081, 0x00401000, |
354 | 0x00000001, 0x00401080, 0x00401000, 0x00000081, |
355 | 0x00400081, 0x00001000, 0x00001001, 0x00401081, |
356 | 0x00000000, 0x00400080, 0x00400001, 0x00001080, |
357 | 0x00401001, 0x00001081, 0x00401080, 0x00000001, |
358 | 0x00001081, 0x00401001, 0x00000080, 0x00400000, |
359 | 0x00001081, 0x00401000, 0x00401001, 0x00000081, |
360 | 0x00001000, 0x00000080, 0x00400000, 0x00401001, |
361 | 0x00400081, 0x00001081, 0x00001080, 0x00000000, |
362 | 0x00000080, 0x00400001, 0x00000001, 0x00400080, |
363 | 0x00000000, 0x00400081, 0x00400080, 0x00001080, |
364 | 0x00000081, 0x00001000, 0x00401081, 0x00400000, |
365 | 0x00401080, 0x00000001, 0x00001001, 0x00401081, |
366 | 0x00400001, 0x00401080, 0x00401000, 0x00001001 }, |
367 | |
368 | /* nibble 7 */ |
369 | { 0x08200020, 0x08208000, 0x00008020, 0x00000000, |
370 | 0x08008000, 0x00200020, 0x08200000, 0x08208020, |
371 | 0x00000020, 0x08000000, 0x00208000, 0x00008020, |
372 | 0x00208020, 0x08008020, 0x08000020, 0x08200000, |
373 | 0x00008000, 0x00208020, 0x00200020, 0x08008000, |
374 | 0x08208020, 0x08000020, 0x00000000, 0x00208000, |
375 | 0x08000000, 0x00200000, 0x08008020, 0x08200020, |
376 | 0x00200000, 0x00008000, 0x08208000, 0x00000020, |
377 | 0x00200000, 0x00008000, 0x08000020, 0x08208020, |
378 | 0x00008020, 0x08000000, 0x00000000, 0x00208000, |
379 | 0x08200020, 0x08008020, 0x08008000, 0x00200020, |
380 | 0x08208000, 0x00000020, 0x00200020, 0x08008000, |
381 | 0x08208020, 0x00200000, 0x08200000, 0x08000020, |
382 | 0x00208000, 0x00008020, 0x08008020, 0x08200000, |
383 | 0x00000020, 0x08208000, 0x00208020, 0x00000000, |
384 | 0x08000000, 0x08200020, 0x00008000, 0x00208020 }}; |
385 | |
386 | /* Some stuff that used to be in des_locl.h. Heavily modified. */ |
387 | /* IP and FP |
388 | * The problem is more of a geometric problem that random bit fiddling. |
389 | 0 1 2 3 4 5 6 7 62 54 46 38 30 22 14 6 |
390 | 8 9 10 11 12 13 14 15 60 52 44 36 28 20 12 4 |
391 | 16 17 18 19 20 21 22 23 58 50 42 34 26 18 10 2 |
392 | 24 25 26 27 28 29 30 31 to 56 48 40 32 24 16 8 0 |
393 | |
394 | 32 33 34 35 36 37 38 39 63 55 47 39 31 23 15 7 |
395 | 40 41 42 43 44 45 46 47 61 53 45 37 29 21 13 5 |
396 | 48 49 50 51 52 53 54 55 59 51 43 35 27 19 11 3 |
397 | 56 57 58 59 60 61 62 63 57 49 41 33 25 17 9 1 |
398 | |
399 | The output has been subject to swaps of the form |
400 | 0 1 -> 3 1 but the odd and even bits have been put into |
401 | 2 3 2 0 |
402 | different words. The main trick is to remember that |
403 | t=((l>>size)^r)&(mask); |
404 | r^=t; |
405 | l^=(t<<size); |
406 | can be used to swap and move bits between words. |
407 | |
408 | So l = 0 1 2 3 r = 16 17 18 19 |
409 | 4 5 6 7 20 21 22 23 |
410 | 8 9 10 11 24 25 26 27 |
411 | 12 13 14 15 28 29 30 31 |
412 | becomes (for size == 2 and mask == 0x3333) |
413 | t = 2^16 3^17 -- -- l = 0 1 16 17 r = 2 3 18 19 |
414 | 6^20 7^21 -- -- 4 5 20 21 6 7 22 23 |
415 | 10^24 11^25 -- -- 8 9 24 25 10 11 24 25 |
416 | 14^28 15^29 -- -- 12 13 28 29 14 15 28 29 |
417 | |
418 | Thanks for hints from Richard Outerbridge - he told me IP&FP |
419 | could be done in 15 xor, 10 shifts and 5 ands. |
420 | When I finally started to think of the problem in 2D |
421 | I first got ~42 operations without xors. When I remembered |
422 | how to use xors :-) I got it to its final state. |
423 | */ |
424 | #define PERM_OP(a,b,t,n,m) ((t)=((((a)>>(n))^(b))&(m)),\ |
425 | (b)^=(t),\ |
426 | (a)^=((t)<<(n))) |
427 | |
428 | #define IP(l,r,t) \ |
429 | PERM_OP(r,l,t, 4,0x0f0f0f0f); \ |
430 | PERM_OP(l,r,t,16,0x0000ffff); \ |
431 | PERM_OP(r,l,t, 2,0x33333333); \ |
432 | PERM_OP(l,r,t, 8,0x00ff00ff); \ |
433 | PERM_OP(r,l,t, 1,0x55555555); |
434 | |
435 | #define FP(l,r,t) \ |
436 | PERM_OP(l,r,t, 1,0x55555555); \ |
437 | PERM_OP(r,l,t, 8,0x00ff00ff); \ |
438 | PERM_OP(l,r,t, 2,0x33333333); \ |
439 | PERM_OP(r,l,t,16,0x0000ffff); \ |
440 | PERM_OP(l,r,t, 4,0x0f0f0f0f); |
441 | |
442 | #define D_ENCRYPT(L,R,S) \ |
443 | u=(R^s[S ]); \ |
444 | t=R^s[S+1]; \ |
445 | t=((t>>4)+(t<<28)); \ |
446 | L^= des_SPtrans[1][(t )&0x3f]| \ |
447 | des_SPtrans[3][(t>> 8)&0x3f]| \ |
448 | des_SPtrans[5][(t>>16)&0x3f]| \ |
449 | des_SPtrans[7][(t>>24)&0x3f]| \ |
450 | des_SPtrans[0][(u )&0x3f]| \ |
451 | des_SPtrans[2][(u>> 8)&0x3f]| \ |
452 | des_SPtrans[4][(u>>16)&0x3f]| \ |
453 | des_SPtrans[6][(u>>24)&0x3f]; |
454 | |
455 | /* This part is based on code that used to be in ecb_enc.c. */ |
456 | /* Copyright (C) 1993 Eric Young - see README for more details */ |
457 | |
458 | static void des_encrypt(word32 l, word32 r, word32 *output, DESContext *ks, |
459 | int encrypt) |
460 | { |
461 | register word32 t,u; |
462 | register int i; |
463 | register word32 *s; |
464 | |
465 | s = ks->key_schedule; |
466 | |
467 | IP(l,r,t); |
468 | /* Things have been modified so that the initial rotate is |
469 | * done outside the loop. This required the |
470 | * des_SPtrans values in sp.h to be rotated 1 bit to the right. |
471 | * One perl script later and things have a 5% speed up on a sparc2. |
472 | * Thanks to Richard Outerbridge <71755.204@CompuServe.COM> |
473 | * for pointing this out. */ |
474 | t=(r<<1)|(r>>31); |
475 | r=(l<<1)|(l>>31); |
476 | l=t; |
477 | |
478 | /* I don't know if it is worth the effort of loop unrolling the |
479 | * inner loop */ |
480 | if (encrypt) |
481 | { |
482 | for (i=0; i<32; i+=4) |
483 | { |
484 | D_ENCRYPT(l,r,i+0); /* 1 */ |
485 | D_ENCRYPT(r,l,i+2); /* 2 */ |
486 | } |
487 | } |
488 | else |
489 | { |
490 | for (i=30; i>0; i-=4) |
491 | { |
492 | D_ENCRYPT(l,r,i-0); /* 16 */ |
493 | D_ENCRYPT(r,l,i-2); /* 15 */ |
494 | } |
495 | } |
496 | l=(l>>1)|(l<<31); |
497 | r=(r>>1)|(r<<31); |
498 | |
499 | FP(r,l,t); |
500 | output[0]=l; |
501 | output[1]=r; |
502 | } |
503 | |
504 | /* Code based on set_key.c. */ |
505 | /* Copyright (C) 1993 Eric Young - see README for more details */ |
506 | |
507 | #define HPERM_OP(a,t,n,m) ((t)=((((a)<<(16-(n)))^(a))&(m)),\ |
508 | (a)=(a)^(t)^(t>>(16-(n)))) |
509 | |
510 | static void des_set_key(unsigned char *key, DESContext *ks) |
511 | { |
512 | register word32 c, d, t, s, shifts; |
513 | register int i; |
514 | register word32 *schedule; |
515 | |
516 | schedule = ks->key_schedule; |
517 | |
518 | c = GET_32BIT_LSB_FIRST(key); |
519 | d = GET_32BIT_LSB_FIRST(key + 4); |
520 | |
521 | /* I now do it in 47 simple operations :-) |
522 | * Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov) |
523 | * for the inspiration. :-) */ |
524 | PERM_OP(d,c,t,4,0x0f0f0f0f); |
525 | HPERM_OP(c,t,-2,0xcccc0000); |
526 | HPERM_OP(d,t,-2,0xcccc0000); |
527 | PERM_OP(d,c,t,1,0x55555555); |
528 | PERM_OP(c,d,t,8,0x00ff00ff); |
529 | PERM_OP(d,c,t,1,0x55555555); |
530 | d = ((d & 0xff) << 16) | (d & 0xff00) | |
531 | ((d >> 16) & 0xff) | ((c >> 4) & 0xf000000); |
532 | c&=0x0fffffff; |
533 | |
534 | shifts = 0x7efc; |
535 | for (i=0; i < 16; i++) |
536 | { |
537 | if (shifts & 1) |
538 | { c=((c>>2)|(c<<26)); d=((d>>2)|(d<<26)); } |
539 | else |
540 | { c=((c>>1)|(c<<27)); d=((d>>1)|(d<<27)); } |
541 | shifts >>= 1; |
542 | c&=0x0fffffff; |
543 | d&=0x0fffffff; |
544 | |
545 | /* could be a few less shifts but I am to lazy at this |
546 | * point in time to investigate */ |
547 | |
548 | s = des_skb[0][ (c )&0x3f ] | |
549 | des_skb[1][((c>> 6)&0x03)|((c>> 7)&0x3c)] | |
550 | des_skb[2][((c>>13)&0x0f)|((c>>14)&0x30)] | |
551 | des_skb[3][((c>>20)&0x01)|((c>>21)&0x06)|((c>>22)&0x38)]; |
552 | |
553 | t = des_skb[4][ (d )&0x3f ] | |
554 | des_skb[5][((d>> 7)&0x03)|((d>> 8)&0x3c)] | |
555 | des_skb[6][ (d>>15)&0x3f ] | |
556 | des_skb[7][((d>>21)&0x0f)|((d>>22)&0x30)]; |
557 | |
558 | /* table contained 0213 4657 */ |
559 | *schedule++ = ((t << 16) | (s & 0xffff)); |
560 | s = ((s >> 16) | (t & 0xffff0000)); |
561 | *schedule++ = (s << 4) | (s >> 28); |
562 | } |
563 | } |
564 | |
565 | static void des_cbc_encrypt(DESContext *ks, unsigned char *iv, |
566 | unsigned char *dest, const unsigned char *src, |
567 | unsigned int len) |
568 | { |
569 | word32 iv0, iv1, out[2]; |
570 | unsigned int i; |
571 | |
572 | assert((len & 7) == 0); |
573 | |
574 | iv0 = GET_32BIT_LSB_FIRST(iv); |
575 | iv1 = GET_32BIT_LSB_FIRST(iv + 4); |
576 | |
577 | for (i = 0; i < len; i += 8) |
578 | { |
579 | iv0 ^= GET_32BIT_LSB_FIRST(src + i); |
580 | iv1 ^= GET_32BIT_LSB_FIRST(src + i + 4); |
581 | des_encrypt(iv0, iv1, out, ks, 1); |
582 | iv0 = out[0]; |
583 | iv1 = out[1]; |
584 | PUT_32BIT_LSB_FIRST(dest + i, iv0); |
585 | PUT_32BIT_LSB_FIRST(dest + i + 4, iv1); |
586 | } |
587 | PUT_32BIT_LSB_FIRST(iv, iv0); |
588 | PUT_32BIT_LSB_FIRST(iv + 4, iv1); |
589 | } |
590 | |
591 | static void des_cbc_decrypt(DESContext *ks, unsigned char *iv, |
592 | unsigned char *dest, const unsigned char *src, |
593 | unsigned int len) |
594 | { |
595 | word32 iv0, iv1, d0, d1, out[2]; |
596 | unsigned int i; |
597 | |
598 | assert((len & 7) == 0); |
599 | |
600 | iv0 = GET_32BIT_LSB_FIRST(iv); |
601 | iv1 = GET_32BIT_LSB_FIRST(iv + 4); |
602 | |
603 | for (i = 0; i < len; i += 8) |
604 | { |
605 | d0 = GET_32BIT_LSB_FIRST(src + i); |
606 | d1 = GET_32BIT_LSB_FIRST(src + i + 4); |
607 | des_encrypt(d0, d1, out, ks, 0); |
608 | iv0 ^= out[0]; |
609 | iv1 ^= out[1]; |
610 | PUT_32BIT_LSB_FIRST(dest + i, iv0); |
611 | PUT_32BIT_LSB_FIRST(dest + i + 4, iv1); |
612 | iv0 = d0; |
613 | iv1 = d1; |
614 | } |
615 | PUT_32BIT_LSB_FIRST(iv, iv0); |
616 | PUT_32BIT_LSB_FIRST(iv + 4, iv1); |
617 | } |
618 | |
619 | static void des_3cbc_encrypt(DESContext *ks1, unsigned char *iv1, |
620 | DESContext *ks2, unsigned char *iv2, |
621 | DESContext *ks3, unsigned char *iv3, |
622 | unsigned char *dest, const unsigned char *src, |
623 | unsigned int len) |
624 | { |
625 | des_cbc_encrypt(ks1, iv1, dest, src, len); |
626 | des_cbc_decrypt(ks2, iv2, dest, dest, len); |
627 | des_cbc_encrypt(ks3, iv3, dest, dest, len); |
628 | } |
629 | |
630 | static void des_3cbc_decrypt(DESContext *ks1, unsigned char *iv1, |
631 | DESContext *ks2, unsigned char *iv2, |
632 | DESContext *ks3, unsigned char *iv3, |
633 | unsigned char *dest, const unsigned char *src, |
634 | unsigned int len) |
635 | { |
636 | des_cbc_decrypt(ks3, iv3, dest, src, len); |
637 | des_cbc_encrypt(ks2, iv2, dest, dest, len); |
638 | des_cbc_decrypt(ks1, iv1, dest, dest, len); |
639 | } |
640 | |
641 | DESContext ekey1, ekey2, ekey3; |
642 | unsigned char eiv1[8], eiv2[8], eiv3[8]; |
643 | |
644 | DESContext dkey1, dkey2, dkey3; |
645 | unsigned char div1[8], div2[8], div3[8]; |
646 | |
647 | static void des3_sesskey(unsigned char *key) { |
648 | des_set_key(key, &ekey1); |
649 | des_set_key(key+8, &ekey2); |
650 | des_set_key(key+16, &ekey3); |
651 | memset(eiv1, 0, sizeof(eiv1)); |
652 | memset(eiv2, 0, sizeof(eiv2)); |
653 | memset(eiv3, 0, sizeof(eiv3)); |
654 | des_set_key(key, &dkey1); |
655 | des_set_key(key+8, &dkey2); |
656 | des_set_key(key+16, &dkey3); |
657 | memset(div1, 0, sizeof(div1)); |
658 | memset(div2, 0, sizeof(div2)); |
659 | memset(div3, 0, sizeof(div3)); |
c5e9c988 |
660 | logevent("Initialised triple-DES encryption"); |
374330e2 |
661 | } |
662 | |
663 | static void des3_encrypt_blk(unsigned char *blk, int len) { |
664 | des_3cbc_encrypt(&ekey1, eiv1, &ekey2, eiv2, &ekey3, eiv3, blk, blk, len); |
665 | } |
666 | |
667 | static void des3_decrypt_blk(unsigned char *blk, int len) { |
668 | des_3cbc_decrypt(&dkey1, div1, &dkey2, div2, &dkey3, div3, blk, blk, len); |
669 | } |
670 | |
671 | struct ssh_cipher ssh_3des = { |
672 | des3_sesskey, |
673 | des3_encrypt_blk, |
674 | des3_decrypt_blk |
675 | }; |
676 | |
9697bfd2 |
677 | static void des_sesskey(unsigned char *key) { |
678 | des_set_key(key, &ekey1); |
679 | memset(eiv1, 0, sizeof(eiv1)); |
680 | des_set_key(key, &dkey1); |
681 | memset(div1, 0, sizeof(div1)); |
c5e9c988 |
682 | logevent("Initialised single-DES encryption"); |
9697bfd2 |
683 | } |
684 | |
685 | static void des_encrypt_blk(unsigned char *blk, int len) { |
686 | des_cbc_encrypt(&ekey1, eiv1, blk, blk, len); |
687 | } |
688 | |
689 | static void des_decrypt_blk(unsigned char *blk, int len) { |
690 | des_cbc_decrypt(&dkey1, div1, blk, blk, len); |
691 | } |
692 | |
693 | struct ssh_cipher ssh_des = { |
694 | des_sesskey, |
695 | des_encrypt_blk, |
696 | des_decrypt_blk |
697 | }; |
698 | |
374330e2 |
699 | #ifdef DES_TEST |
700 | |
701 | void des_encrypt_buf(DESContext *ks, unsigned char *out, |
702 | const unsigned char *in, int encrypt) |
703 | { |
704 | word32 in0, in1, output[0]; |
705 | |
706 | in0 = GET_32BIT_LSB_FIRST(in); |
707 | in1 = GET_32BIT_LSB_FIRST(in + 4); |
708 | des_encrypt(in0, in1, output, ks, encrypt); |
709 | PUT_32BIT_LSB_FIRST(out, output[0]); |
710 | PUT_32BIT_LSB_FIRST(out + 4, output[1]); |
711 | } |
712 | |
713 | int main(int ac, char **av) |
714 | { |
715 | FILE *f; |
716 | char line[1024], *cp; |
717 | int i, value; |
718 | unsigned char key[8], data[8], result[8], output[8]; |
719 | DESContext ks; |
720 | |
721 | while (fgets(line, sizeof(line), stdin)) |
722 | { |
723 | for (i = 0; i < 8; i++) |
724 | { |
725 | if (sscanf(line + 2 * i, "%02x", &value) != 1) |
726 | { |
727 | fprintf(stderr, "1st col, i = %d, line: %s", i, line); |
728 | exit(1); |
729 | } |
730 | key[i] = value; |
731 | } |
732 | for (i = 0; i < 8; i++) |
733 | { |
734 | if (sscanf(line + 2 * i + 17, "%02x", &value) != 1) |
735 | { |
736 | fprintf(stderr, "2nd col, i = %d, line: %s", i, line); |
737 | exit(1); |
738 | } |
739 | data[i] = value; |
740 | } |
741 | for (i = 0; i < 8; i++) |
742 | { |
743 | if (sscanf(line + 2 * i + 2*17, "%02x", &value) != 1) |
744 | { |
745 | fprintf(stderr, "3rd col, i = %d, line: %s", i, line); |
746 | exit(1); |
747 | } |
748 | result[i] = value; |
749 | } |
750 | des_set_key(key, &ks); |
751 | des_encrypt_buf(&ks, output, data, 1); |
752 | if (memcmp(output, result, 8) != 0) |
753 | fprintf(stderr, "Encrypt failed: %s", line); |
754 | des_encrypt_buf(&ks, output, result, 0); |
755 | if (memcmp(output, data, 8) != 0) |
756 | fprintf(stderr, "Decrypt failed: %s", line); |
757 | } |
758 | exit(0); |
759 | } |
760 | #endif /* DES_TEST */ |
761 | |