Home Home > GIT Browse
summaryrefslogtreecommitdiff
blob: 1b1daf63f06202cbb01974086aec490d04f0dcde (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
/* 
   Unix SMB/Netbios implementation.
   Version 1.9.

   a partial implementation of DES designed for use in the 
   SMB authentication protocol

   Copyright (C) Andrew Tridgell 1998
   Modified by Steve French (sfrench@us.ibm.com) 2002,2004
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* NOTES: 

   This code makes no attempt to be fast! In fact, it is a very
   slow implementation 

   This code is NOT a complete DES implementation. It implements only
   the minimum necessary for SMB authentication, as used by all SMB
   products (including every copy of Microsoft Windows95 ever sold)

   In particular, it can only do a unchained forward DES pass. This
   means it is not possible to use this code for encryption/decryption
   of data, instead it is only useful as a "hash" algorithm.

   There is no entry point into this code that allows normal DES operation.

   I believe this means that this code does not come under ITAR
   regulations but this is NOT a legal opinion. If you are concerned
   about the applicability of ITAR regulations to this code then you
   should confirm it for yourself (and maybe let me know if you come
   up with a different answer to the one above)
*/
#include <linux/slab.h>
#include "cifsencrypt.h"
#define uchar unsigned char

static uchar perm1[56] = { 57, 49, 41, 33, 25, 17, 9,
	1, 58, 50, 42, 34, 26, 18,
	10, 2, 59, 51, 43, 35, 27,
	19, 11, 3, 60, 52, 44, 36,
	63, 55, 47, 39, 31, 23, 15,
	7, 62, 54, 46, 38, 30, 22,
	14, 6, 61, 53, 45, 37, 29,
	21, 13, 5, 28, 20, 12, 4
};

static uchar perm2[48] = { 14, 17, 11, 24, 1, 5,
	3, 28, 15, 6, 21, 10,
	23, 19, 12, 4, 26, 8,
	16, 7, 27, 20, 13, 2,
	41, 52, 31, 37, 47, 55,
	30, 40, 51, 45, 33, 48,
	44, 49, 39, 56, 34, 53,
	46, 42, 50, 36, 29, 32
};

static uchar perm3[64] = { 58, 50, 42, 34, 26, 18, 10, 2,
	60, 52, 44, 36, 28, 20, 12, 4,
	62, 54, 46, 38, 30, 22, 14, 6,
	64, 56, 48, 40, 32, 24, 16, 8,
	57, 49, 41, 33, 25, 17, 9, 1,
	59, 51, 43, 35, 27, 19, 11, 3,
	61, 53, 45, 37, 29, 21, 13, 5,
	63, 55, 47, 39, 31, 23, 15, 7
};

static uchar perm4[48] = { 32, 1, 2, 3, 4, 5,
	4, 5, 6, 7, 8, 9,
	8, 9, 10, 11, 12, 13,
	12, 13, 14, 15, 16, 17,
	16, 17, 18, 19, 20, 21,
	20, 21, 22, 23, 24, 25,
	24, 25, 26, 27, 28, 29,
	28, 29, 30, 31, 32, 1
};

static uchar perm5[32] = { 16, 7, 20, 21,
	29, 12, 28, 17,
	1, 15, 23, 26,
	5, 18, 31, 10,
	2, 8, 24, 14,
	32, 27, 3, 9,
	19, 13, 30, 6,
	22, 11, 4, 25
};

static uchar perm6[64] = { 40, 8, 48, 16, 56, 24, 64, 32,
	39, 7, 47, 15, 55, 23, 63, 31,
	38, 6, 46, 14, 54, 22, 62, 30,
	37, 5, 45, 13, 53, 21, 61, 29,
	36, 4, 44, 12, 52, 20, 60, 28,
	35, 3, 43, 11, 51, 19, 59, 27,
	34, 2, 42, 10, 50, 18, 58, 26,
	33, 1, 41, 9, 49, 17, 57, 25
};

static uchar sc[16] = { 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1 };

static uchar sbox[8][4][16] = {
	{{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7},
	 {0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8},
	 {4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0},
	 {15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13}},

	{{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10},
	 {3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5},
	 {0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15},
	 {13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9}},

	{{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8},
	 {13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1},
	 {13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7},
	 {1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12}},

	{{7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15},
	 {13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9},
	 {10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4},
	 {3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14}},

	{{2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9},
	 {14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6},
	 {4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14},
	 {11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3}},

	{{12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11},
	 {10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8},
	 {9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6},
	 {4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13}},

	{{4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1},
	 {13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6},
	 {1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2},
	 {6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12}},

	{{13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7},
	 {1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2},
	 {7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8},
	 {2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11}}
};

static void
permute(char *out, char *in, uchar * p, int n)
{
	int i;
	for (i = 0; i < n; i++)
		out[i] = in[p[i] - 1];
}

static void
lshift(char *d, int count, int n)
{
	char out[64];
	int i;
	for (i = 0; i < n; i++)
		out[i] = d[(i + count) % n];
	for (i = 0; i < n; i++)
		d[i] = out[i];
}

static void
concat(char *out, char *in1, char *in2, int l1, int l2)
{
	while (l1--)
		*out++ = *in1++;
	while (l2--)
		*out++ = *in2++;
}

static void
xor(char *out, char *in1, char *in2, int n)
{
	int i;
	for (i = 0; i < n; i++)
		out[i] = in1[i] ^ in2[i];
}

static void
dohash(char *out, char *in, char *key, int forw)
{
	int i, j, k;
	char *pk1;
	char c[28];
	char d[28];
	char *cd;
	char (*ki)[48];
	char *pd1;
	char l[32], r[32];
	char *rl;

	/* Have to reduce stack usage */
	pk1 = kmalloc(56+56+64+64,GFP_KERNEL);
	if(pk1 == NULL)
		return;

	ki = kmalloc(16*48, GFP_KERNEL);
	if(ki == NULL) {
		kfree(pk1);
		return;
	}

	cd = pk1 + 56;
	pd1= cd  + 56;
	rl = pd1 + 64;

	permute(pk1, key, perm1, 56);

	for (i = 0; i < 28; i++)
		c[i] = pk1[i];
	for (i = 0; i < 28; i++)
		d[i] = pk1[i + 28];

	for (i = 0; i < 16; i++) {
		lshift(c, sc[i], 28);
		lshift(d, sc[i], 28);

		concat(cd, c, d, 28, 28);
		permute(ki[i], cd, perm2, 48);
	}

	permute(pd1, in, perm3, 64);

	for (j = 0; j < 32; j++) {
		l[j] = pd1[j];
		r[j] = pd1[j + 32];
	}

	for (i = 0; i < 16; i++) {
		char *er;  /* er[48]  */
		char *erk; /* erk[48] */
		char b[8][6];
		char *cb;  /* cb[32]  */
		char *pcb; /* pcb[32] */
		char *r2;  /* r2[32]  */

		er = kmalloc(48+48+32+32+32, GFP_KERNEL);
		if(er == NULL) {
			kfree(pk1);
			kfree(ki);
			return;
		}
		erk = er+48;
		cb  = erk+48;
		pcb = cb+32;
		r2  = pcb+32;

		permute(er, r, perm4, 48);

		xor(erk, er, ki[forw ? i : 15 - i], 48);

		for (j = 0; j < 8; j++)
			for (k = 0; k < 6; k++)
				b[j][k] = erk[j * 6 + k];

		for (j = 0; j < 8; j++) {
			int m, n;
			m = (b[j][0] << 1) | b[j][5];

			n = (b[j][1] << 3) | (b[j][2] << 2) | (b[j][3] <<
							       1) | b[j][4];

			for (k = 0; k < 4; k++)
				b[j][k] =
				    (sbox[j][m][n] & (1 << (3 - k))) ? 1 : 0;
		}

		for (j = 0; j < 8; j++)
			for (k = 0; k < 4; k++)
				cb[j * 4 + k] = b[j][k];
		permute(pcb, cb, perm5, 32);

		xor(r2, l, pcb, 32);

		for (j = 0; j < 32; j++)
			l[j] = r[j];

		for (j = 0; j < 32; j++)
			r[j] = r2[j];

		kfree(er);
	}

	concat(rl, r, l, 32, 32);

	permute(out, rl, perm6, 64);
	kfree(pk1);
	kfree(ki);
}

static void
str_to_key(unsigned char *str, unsigned char *key)
{
	int i;

	key[0] = str[0] >> 1;
	key[1] = ((str[0] & 0x01) << 6) | (str[1] >> 2);
	key[2] = ((str[1] & 0x03) << 5) | (str[2] >> 3);
	key[3] = ((str[2] & 0x07) << 4) | (str[3] >> 4);
	key[4] = ((str[3] & 0x0F) << 3) | (str[4] >> 5);
	key[5] = ((str[4] & 0x1F) << 2) | (str[5] >> 6);
	key[6] = ((str[5] & 0x3F) << 1) | (str[6] >> 7);
	key[7] = str[6] & 0x7F;
	for (i = 0; i < 8; i++) {
		key[i] = (key[i] << 1);
	}
}

static void
smbhash(unsigned char *out, unsigned char *in, unsigned char *key, int forw)
{
	int i;
	char *outb; /* outb[64] */
	char *inb;  /* inb[64]  */
	char *keyb; /* keyb[64] */
	unsigned char key2[8];

	outb = kmalloc(64 * 3,GFP_KERNEL);
	if(outb == NULL)
		return;

	inb  = outb + 64;
	keyb = inb +  64;

	str_to_key(key, key2);

	for (i = 0; i < 64; i++) {
		inb[i] = (in[i / 8] & (1 << (7 - (i % 8)))) ? 1 : 0;
		keyb[i] = (key2[i / 8] & (1 << (7 - (i % 8)))) ? 1 : 0;
		outb[i] = 0;
	}

	dohash(outb, inb, keyb, forw);

	for (i = 0; i < 8; i++) {
		out[i] = 0;
	}

	for (i = 0; i < 64; i++) {
		if (outb[i])
			out[i / 8] |= (1 << (7 - (i % 8)));
	}
	kfree(outb);
}

void
E_P16(unsigned char *p14, unsigned char *p16)
{
	unsigned char sp8[8] =
	    { 0x4b, 0x47, 0x53, 0x21, 0x40, 0x23, 0x24, 0x25 };
	smbhash(p16, sp8, p14, 1);
	smbhash(p16 + 8, sp8, p14 + 7, 1);
}

void
E_P24(unsigned char *p21, unsigned char *c8, unsigned char *p24)
{
	smbhash(p24, c8, p21, 1);
	smbhash(p24 + 8, c8, p21 + 7, 1);
	smbhash(p24 + 16, c8, p21 + 14, 1);
}

#if 0 /* currently unsued */
static void
D_P16(unsigned char *p14, unsigned char *in, unsigned char *out)
{
	smbhash(out, in, p14, 0);
	smbhash(out + 8, in + 8, p14 + 7, 0);
}

static void
E_old_pw_hash(unsigned char *p14, unsigned char *in, unsigned char *out)
{
	smbhash(out, in, p14, 1);
	smbhash(out + 8, in + 8, p14 + 7, 1);
}
/* these routines are currently unneeded, but may be
	needed later */
void
cred_hash1(unsigned char *out, unsigned char *in, unsigned char *key)
{
	unsigned char buf[8];

	smbhash(buf, in, key, 1);
	smbhash(out, buf, key + 9, 1);
}

void
cred_hash2(unsigned char *out, unsigned char *in, unsigned char *key)
{
	unsigned char buf[8];
	static unsigned char key2[8];

	smbhash(buf, in, key, 1);
	key2[0] = key[7];
	smbhash(out, buf, key2, 1);
}

void
cred_hash3(unsigned char *out, unsigned char *in, unsigned char *key, int forw)
{
	static unsigned char key2[8];

	smbhash(out, in, key, forw);
	key2[0] = key[7];
	smbhash(out + 8, in + 8, key2, forw);
}
#endif /* unneeded routines */