source: branches/samba-3.0/source/libsmb/smbdes.c@ 715

Last change on this file since 715 was 1, checked in by Paul Smedley, 18 years ago

Initial code import
File size: 12.3 KB
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1/*
2 Unix SMB/CIFS implementation.
3
4 a partial implementation of DES designed for use in the
5 SMB authentication protocol
6
7 Copyright (C) Andrew Tridgell 1998
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22*/
23
24#include "includes.h"
25
26/* NOTES:
27
28 This code makes no attempt to be fast! In fact, it is a very
29 slow implementation
30
31 This code is NOT a complete DES implementation. It implements only
32 the minimum necessary for SMB authentication, as used by all SMB
33 products (including every copy of Microsoft Windows95 ever sold)
34
35 In particular, it can only do a unchained forward DES pass. This
36 means it is not possible to use this code for encryption/decryption
37 of data, instead it is only useful as a "hash" algorithm.
38
39 There is no entry point into this code that allows normal DES operation.
40
41 I believe this means that this code does not come under ITAR
42 regulations but this is NOT a legal opinion. If you are concerned
43 about the applicability of ITAR regulations to this code then you
44 should confirm it for yourself (and maybe let me know if you come
45 up with a different answer to the one above)
46*/
47
48
49#define uchar unsigned char
50
51static const uchar perm1[56] = {57, 49, 41, 33, 25, 17, 9,
52 1, 58, 50, 42, 34, 26, 18,
53 10, 2, 59, 51, 43, 35, 27,
54 19, 11, 3, 60, 52, 44, 36,
55 63, 55, 47, 39, 31, 23, 15,
56 7, 62, 54, 46, 38, 30, 22,
57 14, 6, 61, 53, 45, 37, 29,
58 21, 13, 5, 28, 20, 12, 4};
59
60static const uchar perm2[48] = {14, 17, 11, 24, 1, 5,
61 3, 28, 15, 6, 21, 10,
62 23, 19, 12, 4, 26, 8,
63 16, 7, 27, 20, 13, 2,
64 41, 52, 31, 37, 47, 55,
65 30, 40, 51, 45, 33, 48,
66 44, 49, 39, 56, 34, 53,
67 46, 42, 50, 36, 29, 32};
68
69static const uchar perm3[64] = {58, 50, 42, 34, 26, 18, 10, 2,
70 60, 52, 44, 36, 28, 20, 12, 4,
71 62, 54, 46, 38, 30, 22, 14, 6,
72 64, 56, 48, 40, 32, 24, 16, 8,
73 57, 49, 41, 33, 25, 17, 9, 1,
74 59, 51, 43, 35, 27, 19, 11, 3,
75 61, 53, 45, 37, 29, 21, 13, 5,
76 63, 55, 47, 39, 31, 23, 15, 7};
77
78static const uchar perm4[48] = { 32, 1, 2, 3, 4, 5,
79 4, 5, 6, 7, 8, 9,
80 8, 9, 10, 11, 12, 13,
81 12, 13, 14, 15, 16, 17,
82 16, 17, 18, 19, 20, 21,
83 20, 21, 22, 23, 24, 25,
84 24, 25, 26, 27, 28, 29,
85 28, 29, 30, 31, 32, 1};
86
87static const uchar perm5[32] = { 16, 7, 20, 21,
88 29, 12, 28, 17,
89 1, 15, 23, 26,
90 5, 18, 31, 10,
91 2, 8, 24, 14,
92 32, 27, 3, 9,
93 19, 13, 30, 6,
94 22, 11, 4, 25};
95
96
97static const uchar perm6[64] ={ 40, 8, 48, 16, 56, 24, 64, 32,
98 39, 7, 47, 15, 55, 23, 63, 31,
99 38, 6, 46, 14, 54, 22, 62, 30,
100 37, 5, 45, 13, 53, 21, 61, 29,
101 36, 4, 44, 12, 52, 20, 60, 28,
102 35, 3, 43, 11, 51, 19, 59, 27,
103 34, 2, 42, 10, 50, 18, 58, 26,
104 33, 1, 41, 9, 49, 17, 57, 25};
105
106
107static const uchar sc[16] = {1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1};
108
109static const uchar sbox[8][4][16] = {
110 {{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7},
111 {0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8},
112 {4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0},
113 {15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13}},
114
115 {{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10},
116 {3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5},
117 {0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15},
118 {13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9}},
119
120 {{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8},
121 {13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1},
122 {13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7},
123 {1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12}},
124
125 {{7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15},
126 {13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9},
127 {10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4},
128 {3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14}},
129
130 {{2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9},
131 {14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6},
132 {4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14},
133 {11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3}},
134
135 {{12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11},
136 {10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8},
137 {9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6},
138 {4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13}},
139
140 {{4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1},
141 {13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6},
142 {1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2},
143 {6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12}},
144
145 {{13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7},
146 {1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2},
147 {7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8},
148 {2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11}}};
149
150static void permute(char *out, const char *in, const uchar *p, int n)
151{
152 int i;
153 for (i=0;i<n;i++)
154 out[i] = in[p[i]-1];
155}
156
157static void lshift(char *d, int count, int n)
158{
159 char out[64];
160 int i;
161 for (i=0;i<n;i++)
162 out[i] = d[(i+count)%n];
163 for (i=0;i<n;i++)
164 d[i] = out[i];
165}
166
167static void concat(char *out, char *in1, char *in2, int l1, int l2)
168{
169 while (l1--)
170 *out++ = *in1++;
171 while (l2--)
172 *out++ = *in2++;
173}
174
175static void x_or(char *out, char *in1, char *in2, int n)
176{
177 int i;
178 for (i=0;i<n;i++)
179 out[i] = in1[i] ^ in2[i];
180}
181
182static void dohash(char *out, char *in, char *key, int forw)
183{
184 int i, j, k;
185 char pk1[56];
186 char c[28];
187 char d[28];
188 char cd[56];
189 char ki[16][48];
190 char pd1[64];
191 char l[32], r[32];
192 char rl[64];
193
194 permute(pk1, key, perm1, 56);
195
196 for (i=0;i<28;i++)
197 c[i] = pk1[i];
198 for (i=0;i<28;i++)
199 d[i] = pk1[i+28];
200
201 for (i=0;i<16;i++) {
202 lshift(c, sc[i], 28);
203 lshift(d, sc[i], 28);
204
205 concat(cd, c, d, 28, 28);
206 permute(ki[i], cd, perm2, 48);
207 }
208
209 permute(pd1, in, perm3, 64);
210
211 for (j=0;j<32;j++) {
212 l[j] = pd1[j];
213 r[j] = pd1[j+32];
214 }
215
216 for (i=0;i<16;i++) {
217 char er[48];
218 char erk[48];
219 char b[8][6];
220 char cb[32];
221 char pcb[32];
222 char r2[32];
223
224 permute(er, r, perm4, 48);
225
226 x_or(erk, er, ki[forw ? i : 15 - i], 48);
227
228 for (j=0;j<8;j++)
229 for (k=0;k<6;k++)
230 b[j][k] = erk[j*6 + k];
231
232 for (j=0;j<8;j++) {
233 int m, n;
234 m = (b[j][0]<<1) | b[j][5];
235
236 n = (b[j][1]<<3) | (b[j][2]<<2) | (b[j][3]<<1) | b[j][4];
237
238 for (k=0;k<4;k++)
239 b[j][k] = (sbox[j][m][n] & (1<<(3-k)))?1:0;
240 }
241
242 for (j=0;j<8;j++)
243 for (k=0;k<4;k++)
244 cb[j*4+k] = b[j][k];
245 permute(pcb, cb, perm5, 32);
246
247 x_or(r2, l, pcb, 32);
248
249 for (j=0;j<32;j++)
250 l[j] = r[j];
251
252 for (j=0;j<32;j++)
253 r[j] = r2[j];
254 }
255
256 concat(rl, r, l, 32, 32);
257
258 permute(out, rl, perm6, 64);
259}
260
261/* Convert a 7 byte string to an 8 byte key. */
262static void str_to_key(const unsigned char str[7], unsigned char key[8])
263{
264 int i;
265
266 key[0] = str[0]>>1;
267 key[1] = ((str[0]&0x01)<<6) | (str[1]>>2);
268 key[2] = ((str[1]&0x03)<<5) | (str[2]>>3);
269 key[3] = ((str[2]&0x07)<<4) | (str[3]>>4);
270 key[4] = ((str[3]&0x0F)<<3) | (str[4]>>5);
271 key[5] = ((str[4]&0x1F)<<2) | (str[5]>>6);
272 key[6] = ((str[5]&0x3F)<<1) | (str[6]>>7);
273 key[7] = str[6]&0x7F;
274 for (i=0;i<8;i++) {
275 key[i] = (key[i]<<1);
276 }
277}
278
279
280void des_crypt56(unsigned char *out, const unsigned char *in, const unsigned char *key, int forw)
281{
282 int i;
283 char outb[64];
284 char inb[64];
285 char keyb[64];
286 unsigned char key2[8];
287
288 str_to_key(key, key2);
289
290 for (i=0;i<64;i++) {
291 inb[i] = (in[i/8] & (1<<(7-(i%8)))) ? 1 : 0;
292 keyb[i] = (key2[i/8] & (1<<(7-(i%8)))) ? 1 : 0;
293 outb[i] = 0;
294 }
295
296 dohash(outb, inb, keyb, forw);
297
298 for (i=0;i<8;i++) {
299 out[i] = 0;
300 }
301
302 for (i=0;i<64;i++) {
303 if (outb[i])
304 out[i/8] |= (1<<(7-(i%8)));
305 }
306}
307
308void E_P16(const unsigned char *p14,unsigned char *p16)
309{
310 unsigned char sp8[8] = {0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25};
311 des_crypt56(p16, sp8, p14, 1);
312 des_crypt56(p16+8, sp8, p14+7, 1);
313}
314
315void E_P24(const unsigned char *p21, const unsigned char *c8, unsigned char *p24)
316{
317 des_crypt56(p24, c8, p21, 1);
318 des_crypt56(p24+8, c8, p21+7, 1);
319 des_crypt56(p24+16, c8, p21+14, 1);
320}
321
322void D_P16(const unsigned char *p14, const unsigned char *in, unsigned char *out)
323{
324 des_crypt56(out, in, p14, 0);
325 des_crypt56(out+8, in+8, p14+7, 0);
326}
327
328void E_old_pw_hash( unsigned char *p14, const unsigned char *in, unsigned char *out)
329{
330 des_crypt56(out, in, p14, 1);
331 des_crypt56(out+8, in+8, p14+7, 1);
332}
333
334/* forward des encryption with a 128 bit key */
335void des_crypt128(unsigned char out[8], const unsigned char in[8], const unsigned char key[16])
336{
337 unsigned char buf[8];
338
339 des_crypt56(buf, in, key, 1);
340 des_crypt56(out, buf, key+9, 1);
341}
342
343/* forward des encryption with a 64 bit key */
344void des_crypt64(unsigned char out[8], const unsigned char in[8], const unsigned char key[8])
345{
346 unsigned char buf[8];
347 unsigned char key2[8];
348
349 memset(key2,'\0',8);
350 des_crypt56(buf, in, key, 1);
351 key2[0] = key[7];
352 des_crypt56(out, buf, key2, 1);
353}
354
355/* des encryption with a 112 bit (14 byte) key */
356/* Note that if the forw is 1, and key is actually 8 bytes of key, followed by 6 bytes of zeros,
357 this is identical to des_crypt64(). JRA. */
358
359void des_crypt112(unsigned char out[8], const unsigned char in[8], const unsigned char key[14], int forw)
360{
361 unsigned char buf[8];
362 des_crypt56(buf, in, key, forw);
363 des_crypt56(out, buf, key+7, forw);
364}
365
366void cred_hash3(unsigned char *out, const unsigned char *in, const unsigned char *key, int forw)
367{
368 unsigned char key2[8];
369
370 memset(key2,'\0',8);
371 des_crypt56(out, in, key, forw);
372 key2[0] = key[7];
373 des_crypt56(out + 8, in + 8, key2, forw);
374}
375
376/* des encryption of a 16 byte lump of data with a 112 bit key */
377/* Note that if the key is actually 8 bytes of key, followed by 6 bytes of zeros,
378 this is identical to cred_hash3(). JRA. */
379
380void des_crypt112_16(unsigned char out[16], unsigned char in[16], const unsigned char key[14], int forw)
381{
382 des_crypt56(out, in, key, forw);
383 des_crypt56(out + 8, in + 8, key+7, forw);
384}
385
386/*****************************************************************
387 arc4 crypt/decrypt with a 16 byte key.
388*****************************************************************/
389
390void SamOEMhash( unsigned char *data, const unsigned char key[16], size_t len)
391{
392 unsigned char arc4_state[258];
393
394 smb_arc4_init(arc4_state, key, 16);
395 smb_arc4_crypt(arc4_state, data, len);
396}
397
398void SamOEMhashBlob( unsigned char *data, size_t len, DATA_BLOB *key)
399{
400 unsigned char arc4_state[258];
401
402 smb_arc4_init(arc4_state, key->data, key->length);
403 smb_arc4_crypt(arc4_state, data, len);
404}
405
406/* Decode a sam password hash into a password. The password hash is the
407 same method used to store passwords in the NT registry. The DES key
408 used is based on the RID of the user. */
409
410void sam_pwd_hash(unsigned int rid, const uchar *in, uchar *out, int forw)
411{
412 uchar s[14];
413
414 s[0] = s[4] = s[8] = s[12] = (uchar)(rid & 0xFF);
415 s[1] = s[5] = s[9] = s[13] = (uchar)((rid >> 8) & 0xFF);
416 s[2] = s[6] = s[10] = (uchar)((rid >> 16) & 0xFF);
417 s[3] = s[7] = s[11] = (uchar)((rid >> 24) & 0xFF);
418
419 des_crypt56(out, in, s, forw);
420 des_crypt56(out+8, in+8, s+7, forw);
421}
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