1/*
2 *  Routines in this file based on work of Volker Lendecke
3 */
4/*$*********************************************************
5   $*
6   $* This code has been taken from DDJ 11/93, from an
7   $* article by Pawel Szczerbina.
8   $*
9   $* Password encryption routines follow.
10   $* Converted to C from Barry Nance's Pascal
11   $* prog published in the March -93 issue of Byte.
12   $*
13   $* Adapted to be useable for ncpfs by
14   $* Volker Lendecke <lendecke@namu01.gwdg.de> in
15   $* October 1995.
16   $*
17   $********************************************************* */
18
19#include <sys/cdefs.h>
20__FBSDID("$FreeBSD$");
21
22#include <sys/param.h>
23#include <sys/systm.h>
24#include <netncp/ncp.h>
25#include <netncp/ncp_subr.h>
26
27typedef unsigned char buf32[32];
28
29static unsigned char encrypttable[256] = {
300x7, 0x8, 0x0, 0x8, 0x6, 0x4, 0xE, 0x4, 0x5, 0xC, 0x1, 0x7, 0xB, 0xF, 0xA, 0x8,
310xF, 0x8, 0xC, 0xC, 0x9, 0x4, 0x1, 0xE, 0x4, 0x6, 0x2, 0x4, 0x0, 0xA, 0xB, 0x9,
320x2, 0xF, 0xB, 0x1, 0xD, 0x2, 0x1, 0x9, 0x5, 0xE, 0x7, 0x0, 0x0, 0x2, 0x6, 0x6,
330x0, 0x7, 0x3, 0x8, 0x2, 0x9, 0x3, 0xF, 0x7, 0xF, 0xC, 0xF, 0x6, 0x4, 0xA, 0x0,
340x2, 0x3, 0xA, 0xB, 0xD, 0x8, 0x3, 0xA, 0x1, 0x7, 0xC, 0xF, 0x1, 0x8, 0x9, 0xD,
350x9, 0x1, 0x9, 0x4, 0xE, 0x4, 0xC, 0x5, 0x5, 0xC, 0x8, 0xB, 0x2, 0x3, 0x9, 0xE,
360x7, 0x7, 0x6, 0x9, 0xE, 0xF, 0xC, 0x8, 0xD, 0x1, 0xA, 0x6, 0xE, 0xD, 0x0, 0x7,
370x7, 0xA, 0x0, 0x1, 0xF, 0x5, 0x4, 0xB, 0x7, 0xB, 0xE, 0xC, 0x9, 0x5, 0xD, 0x1,
380xB, 0xD, 0x1, 0x3, 0x5, 0xD, 0xE, 0x6, 0x3, 0x0, 0xB, 0xB, 0xF, 0x3, 0x6, 0x4,
390x9, 0xD, 0xA, 0x3, 0x1, 0x4, 0x9, 0x4, 0x8, 0x3, 0xB, 0xE, 0x5, 0x0, 0x5, 0x2,
400xC, 0xB, 0xD, 0x5, 0xD, 0x5, 0xD, 0x2, 0xD, 0x9, 0xA, 0xC, 0xA, 0x0, 0xB, 0x3,
410x5, 0x3, 0x6, 0x9, 0x5, 0x1, 0xE, 0xE, 0x0, 0xE, 0x8, 0x2, 0xD, 0x2, 0x2, 0x0,
420x4, 0xF, 0x8, 0x5, 0x9, 0x6, 0x8, 0x6, 0xB, 0xA, 0xB, 0xF, 0x0, 0x7, 0x2, 0x8,
430xC, 0x7, 0x3, 0xA, 0x1, 0x4, 0x2, 0x5, 0xF, 0x7, 0xA, 0xC, 0xE, 0x5, 0x9, 0x3,
440xE, 0x7, 0x1, 0x2, 0xE, 0x1, 0xF, 0x4, 0xA, 0x6, 0xC, 0x6, 0xF, 0x4, 0x3, 0x0,
450xC, 0x0, 0x3, 0x6, 0xF, 0x8, 0x7, 0xB, 0x2, 0xD, 0xC, 0x6, 0xA, 0xA, 0x8, 0xD
46};
47
48static buf32 encryptkeys = {
49    0x48, 0x93, 0x46, 0x67, 0x98, 0x3D, 0xE6, 0x8D,
50    0xB7, 0x10, 0x7A, 0x26, 0x5A, 0xB9, 0xB1, 0x35,
51    0x6B, 0x0F, 0xD5, 0x70, 0xAE, 0xFB, 0xAD, 0x11,
52    0xF4, 0x47, 0xDC, 0xA7, 0xEC, 0xCF, 0x50, 0xC0
53};
54
55/*
56 * Create table-based 16-bytes hash from a 32-bytes array
57 */
58static void
59nw_hash(buf32 temp, unsigned char *target) {
60	short sum;
61	unsigned char b3;
62	int s, b2, i;
63
64	sum = 0;
65
66	for (b2 = 0; b2 <= 1; ++b2) {
67		for (s = 0; s <= 31; ++s) {
68			b3 = (temp[s] + sum) ^ (temp[(s + sum) & 31] - encryptkeys[s]);
69			sum += b3;
70			temp[s] = b3;
71		}
72	}
73
74	for (i = 0; i <= 15; ++i) {
75		target[i] = encrypttable[temp[2 * i]]
76		    | (encrypttable[temp[2 * i + 1]] << 4);
77	}
78}
79
80
81/*
82 * Create a 16-bytes pattern from given buffer based on a four bytes key
83 */
84void
85nw_keyhash(const u_char *key, const u_char *buf, int buflen, u_char *target) {
86	int b2, d, s;
87	buf32 temp;
88
89	while (buflen > 0 && buf[buflen - 1] == 0)
90		buflen--;
91
92	bzero(temp, sizeof(temp));
93
94	d = 0;
95	while (buflen >= 32) {
96		for (s = 0; s <= 31; ++s)
97			temp[s] ^= buf[d++];
98		buflen -= 32;
99	}
100	b2 = d;
101	if (buflen > 0)	{
102		for (s = 0; s <= 31; ++s) {
103			if (d + buflen == b2) {
104				temp[s] ^= encryptkeys[s];
105				b2 = d;
106			} else
107				temp[s] ^= buf[b2++];
108		}
109	}
110	for (s = 0; s <= 31; ++s)
111		temp[s] ^= key[s & 3];
112
113	nw_hash(temp, target);
114}
115
116/*
117 * Create an 8-bytes pattern from an 8-bytes key and 16-bytes of data
118 */
119void
120nw_encrypt(const u_char *fra, const u_char *buf, u_char *target) {
121	buf32 k;
122	int s;
123
124	nw_keyhash(fra, buf, 16, k);
125	nw_keyhash(fra + 4, buf, 16, k + 16);
126
127	for (s = 0; s < 16; s++)
128		k[s] ^= k[31 - s];
129
130	for (s = 0; s < 8; s++)
131		*target++ = k[s] ^ k[15 - s];
132}
133
134#ifdef _KERNEL
135/*
136 * MD4 routine taken from libmd sources
137 */
138typedef u_int32_t	UINT4;
139typedef unsigned char *POINTER;
140
141#define PROTO_LIST(list) list
142
143static void Decode PROTO_LIST
144  ((UINT4 *, const unsigned char *, unsigned int));
145
146/* Constants for MD4Transform routine.
147 */
148#define S11 3
149#define S12 7
150#define S13 11
151#define S14 19
152#define S21 3
153#define S22 5
154#define S23 9
155#define S24 13
156#define S31 3
157#define S32 9
158#define S33 11
159#define S34 15
160
161/* F, G and H are basic MD4 functions.
162 */
163#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
164#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
165#define H(x, y, z) ((x) ^ (y) ^ (z))
166
167/* ROTATE_LEFT rotates x left n bits.
168 */
169#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
170
171/* FF, GG and HH are transformations for rounds 1, 2 and 3 */
172/* Rotation is separate from addition to prevent recomputation */
173#define FF(a, b, c, d, x, s) { \
174    (a) += F ((b), (c), (d)) + (x); \
175    (a) = ROTATE_LEFT ((a), (s)); \
176  }
177#define GG(a, b, c, d, x, s) { \
178    (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
179    (a) = ROTATE_LEFT ((a), (s)); \
180  }
181#define HH(a, b, c, d, x, s) { \
182    (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
183    (a) = ROTATE_LEFT ((a), (s)); \
184  }
185
186void
187ncp_sign(const u_int32_t *state, const char *block, u_int32_t *ostate) {
188	UINT4 a, b, c, d, x[16];
189
190	Decode (x, block, 64);
191	a = state[0];
192	b = state[1];
193	c = state[2];
194	d = state[3];
195	/* Round 1 */
196	FF (a, b, c, d, x[ 0], S11); /* 1 */
197	FF (d, a, b, c, x[ 1], S12); /* 2 */
198	FF (c, d, a, b, x[ 2], S13); /* 3 */
199	FF (b, c, d, a, x[ 3], S14); /* 4 */
200	FF (a, b, c, d, x[ 4], S11); /* 5 */
201	FF (d, a, b, c, x[ 5], S12); /* 6 */
202	FF (c, d, a, b, x[ 6], S13); /* 7 */
203	FF (b, c, d, a, x[ 7], S14); /* 8 */
204	FF (a, b, c, d, x[ 8], S11); /* 9 */
205	FF (d, a, b, c, x[ 9], S12); /* 10 */
206	FF (c, d, a, b, x[10], S13); /* 11 */
207	FF (b, c, d, a, x[11], S14); /* 12 */
208	FF (a, b, c, d, x[12], S11); /* 13 */
209	FF (d, a, b, c, x[13], S12); /* 14 */
210	FF (c, d, a, b, x[14], S13); /* 15 */
211	FF (b, c, d, a, x[15], S14); /* 16 */
212
213	/* Round 2 */
214	GG (a, b, c, d, x[ 0], S21); /* 17 */
215	GG (d, a, b, c, x[ 4], S22); /* 18 */
216	GG (c, d, a, b, x[ 8], S23); /* 19 */
217	GG (b, c, d, a, x[12], S24); /* 20 */
218	GG (a, b, c, d, x[ 1], S21); /* 21 */
219	GG (d, a, b, c, x[ 5], S22); /* 22 */
220	GG (c, d, a, b, x[ 9], S23); /* 23 */
221	GG (b, c, d, a, x[13], S24); /* 24 */
222	GG (a, b, c, d, x[ 2], S21); /* 25 */
223	GG (d, a, b, c, x[ 6], S22); /* 26 */
224	GG (c, d, a, b, x[10], S23); /* 27 */
225	GG (b, c, d, a, x[14], S24); /* 28 */
226	GG (a, b, c, d, x[ 3], S21); /* 29 */
227	GG (d, a, b, c, x[ 7], S22); /* 30 */
228	GG (c, d, a, b, x[11], S23); /* 31 */
229	GG (b, c, d, a, x[15], S24); /* 32 */
230
231	/* Round 3 */
232	HH (a, b, c, d, x[ 0], S31); /* 33 */
233	HH (d, a, b, c, x[ 8], S32); /* 34 */
234	HH (c, d, a, b, x[ 4], S33); /* 35 */
235	HH (b, c, d, a, x[12], S34); /* 36 */
236	HH (a, b, c, d, x[ 2], S31); /* 37 */
237	HH (d, a, b, c, x[10], S32); /* 38 */
238	HH (c, d, a, b, x[ 6], S33); /* 39 */
239	HH (b, c, d, a, x[14], S34); /* 40 */
240	HH (a, b, c, d, x[ 1], S31); /* 41 */
241	HH (d, a, b, c, x[ 9], S32); /* 42 */
242	HH (c, d, a, b, x[ 5], S33); /* 43 */
243	HH (b, c, d, a, x[13], S34); /* 44 */
244	HH (a, b, c, d, x[ 3], S31); /* 45 */
245	HH (d, a, b, c, x[11], S32); /* 46 */
246	HH (c, d, a, b, x[ 7], S33); /* 47 */
247	HH (b, c, d, a, x[15], S34); /* 48 */
248
249	ostate[0] = state[0] + a;
250	ostate[1] = state[1] + b;
251	ostate[2] = state[2] + c;
252	ostate[3] = state[3] + d;
253}
254
255/* Decodes input (unsigned char) into output (UINT4). Assumes len is
256     a multiple of 4.
257 */
258static void Decode (output, input, len)
259
260UINT4 *output;
261const unsigned char *input;
262unsigned int len;
263{
264  unsigned int i, j;
265
266  for (i = 0, j = 0; j < len; i++, j += 4)
267    output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
268      (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
269}
270
271#endif /* _KERNEL */
272