6 #include <netncp/ncp.h>
7 #include <netncp/ncp_subr.h>
10 * Routines in this file based on work of Volker Lendecke
12 /*$*********************************************************
14 $* This code has been taken from DDJ 11/93, from an
15 $* article by Pawel Szczerbina.
17 $* Password encryption routines follow.
18 $* Converted to C from Barry Nance's Pascal
19 $* prog published in the March -93 issue of Byte.
21 $* Adapted to be useable for ncpfs by
22 $* Volker Lendecke <lendecke@namu01.gwdg.de> in
25 $********************************************************* */
29 typedef unsigned char buf32[32];
31 static unsigned char encrypttable[256] = {
32 0x7, 0x8, 0x0, 0x8, 0x6, 0x4, 0xE, 0x4, 0x5, 0xC, 0x1, 0x7, 0xB, 0xF, 0xA, 0x8,
33 0xF, 0x8, 0xC, 0xC, 0x9, 0x4, 0x1, 0xE, 0x4, 0x6, 0x2, 0x4, 0x0, 0xA, 0xB, 0x9,
34 0x2, 0xF, 0xB, 0x1, 0xD, 0x2, 0x1, 0x9, 0x5, 0xE, 0x7, 0x0, 0x0, 0x2, 0x6, 0x6,
35 0x0, 0x7, 0x3, 0x8, 0x2, 0x9, 0x3, 0xF, 0x7, 0xF, 0xC, 0xF, 0x6, 0x4, 0xA, 0x0,
36 0x2, 0x3, 0xA, 0xB, 0xD, 0x8, 0x3, 0xA, 0x1, 0x7, 0xC, 0xF, 0x1, 0x8, 0x9, 0xD,
37 0x9, 0x1, 0x9, 0x4, 0xE, 0x4, 0xC, 0x5, 0x5, 0xC, 0x8, 0xB, 0x2, 0x3, 0x9, 0xE,
38 0x7, 0x7, 0x6, 0x9, 0xE, 0xF, 0xC, 0x8, 0xD, 0x1, 0xA, 0x6, 0xE, 0xD, 0x0, 0x7,
39 0x7, 0xA, 0x0, 0x1, 0xF, 0x5, 0x4, 0xB, 0x7, 0xB, 0xE, 0xC, 0x9, 0x5, 0xD, 0x1,
40 0xB, 0xD, 0x1, 0x3, 0x5, 0xD, 0xE, 0x6, 0x3, 0x0, 0xB, 0xB, 0xF, 0x3, 0x6, 0x4,
41 0x9, 0xD, 0xA, 0x3, 0x1, 0x4, 0x9, 0x4, 0x8, 0x3, 0xB, 0xE, 0x5, 0x0, 0x5, 0x2,
42 0xC, 0xB, 0xD, 0x5, 0xD, 0x5, 0xD, 0x2, 0xD, 0x9, 0xA, 0xC, 0xA, 0x0, 0xB, 0x3,
43 0x5, 0x3, 0x6, 0x9, 0x5, 0x1, 0xE, 0xE, 0x0, 0xE, 0x8, 0x2, 0xD, 0x2, 0x2, 0x0,
44 0x4, 0xF, 0x8, 0x5, 0x9, 0x6, 0x8, 0x6, 0xB, 0xA, 0xB, 0xF, 0x0, 0x7, 0x2, 0x8,
45 0xC, 0x7, 0x3, 0xA, 0x1, 0x4, 0x2, 0x5, 0xF, 0x7, 0xA, 0xC, 0xE, 0x5, 0x9, 0x3,
46 0xE, 0x7, 0x1, 0x2, 0xE, 0x1, 0xF, 0x4, 0xA, 0x6, 0xC, 0x6, 0xF, 0x4, 0x3, 0x0,
47 0xC, 0x0, 0x3, 0x6, 0xF, 0x8, 0x7, 0xB, 0x2, 0xD, 0xC, 0x6, 0xA, 0xA, 0x8, 0xD
50 static buf32 encryptkeys = {
51 0x48, 0x93, 0x46, 0x67, 0x98, 0x3D, 0xE6, 0x8D,
52 0xB7, 0x10, 0x7A, 0x26, 0x5A, 0xB9, 0xB1, 0x35,
53 0x6B, 0x0F, 0xD5, 0x70, 0xAE, 0xFB, 0xAD, 0x11,
54 0xF4, 0x47, 0xDC, 0xA7, 0xEC, 0xCF, 0x50, 0xC0
58 * Create table-based 16-bytes hash from a 32-bytes array
61 nw_hash(buf32 temp, unsigned char *target) {
68 for (b2 = 0; b2 <= 1; ++b2) {
69 for (s = 0; s <= 31; ++s) {
70 b3 = (temp[s] + sum) ^ (temp[(s + sum) & 31] - encryptkeys[s]);
76 for (i = 0; i <= 15; ++i) {
77 target[i] = encrypttable[temp[2 * i]]
78 | (encrypttable[temp[2 * i + 1]] << 4);
84 * Create a 16-bytes pattern from given buffer based on a four bytes key
87 nw_keyhash(const u_char *key, const u_char *buf, int buflen, u_char *target) {
91 while (buflen > 0 && buf[buflen - 1] == 0)
94 bzero(temp, sizeof(temp));
97 while (buflen >= 32) {
98 for (s = 0; s <= 31; ++s)
104 for (s = 0; s <= 31; ++s) {
105 if (d + buflen == b2) {
106 temp[s] ^= encryptkeys[s];
109 temp[s] ^= buf[b2++];
112 for (s = 0; s <= 31; ++s)
113 temp[s] ^= key[s & 3];
115 nw_hash(temp, target);
119 * Create an 8-bytes pattern from an 8-bytes key and 16-bytes of data
122 nw_encrypt(const u_char *fra, const u_char *buf, u_char *target) {
126 nw_keyhash(fra, buf, 16, k);
127 nw_keyhash(fra + 4, buf, 16, k + 16);
129 for (s = 0; s < 16; s++)
132 for (s = 0; s < 8; s++)
133 *target++ = k[s] ^ k[15 - s];
138 * MD4 routine taken from libmd sources
140 typedef u_int32_t UINT4;
141 typedef unsigned char *POINTER;
143 #define PROTO_LIST(list) list
145 static void Decode PROTO_LIST
146 ((UINT4 *, const unsigned char *, unsigned int));
148 /* Constants for MD4Transform routine.
163 /* F, G and H are basic MD4 functions.
165 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
166 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
167 #define H(x, y, z) ((x) ^ (y) ^ (z))
169 /* ROTATE_LEFT rotates x left n bits.
171 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
173 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
174 /* Rotation is separate from addition to prevent recomputation */
175 #define FF(a, b, c, d, x, s) { \
176 (a) += F ((b), (c), (d)) + (x); \
177 (a) = ROTATE_LEFT ((a), (s)); \
179 #define GG(a, b, c, d, x, s) { \
180 (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
181 (a) = ROTATE_LEFT ((a), (s)); \
183 #define HH(a, b, c, d, x, s) { \
184 (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
185 (a) = ROTATE_LEFT ((a), (s)); \
189 ncp_sign(const u_int32_t *state, const char *block, u_int32_t *ostate) {
190 UINT4 a, b, c, d, x[16];
192 Decode (x, block, 64);
198 FF (a, b, c, d, x[ 0], S11); /* 1 */
199 FF (d, a, b, c, x[ 1], S12); /* 2 */
200 FF (c, d, a, b, x[ 2], S13); /* 3 */
201 FF (b, c, d, a, x[ 3], S14); /* 4 */
202 FF (a, b, c, d, x[ 4], S11); /* 5 */
203 FF (d, a, b, c, x[ 5], S12); /* 6 */
204 FF (c, d, a, b, x[ 6], S13); /* 7 */
205 FF (b, c, d, a, x[ 7], S14); /* 8 */
206 FF (a, b, c, d, x[ 8], S11); /* 9 */
207 FF (d, a, b, c, x[ 9], S12); /* 10 */
208 FF (c, d, a, b, x[10], S13); /* 11 */
209 FF (b, c, d, a, x[11], S14); /* 12 */
210 FF (a, b, c, d, x[12], S11); /* 13 */
211 FF (d, a, b, c, x[13], S12); /* 14 */
212 FF (c, d, a, b, x[14], S13); /* 15 */
213 FF (b, c, d, a, x[15], S14); /* 16 */
216 GG (a, b, c, d, x[ 0], S21); /* 17 */
217 GG (d, a, b, c, x[ 4], S22); /* 18 */
218 GG (c, d, a, b, x[ 8], S23); /* 19 */
219 GG (b, c, d, a, x[12], S24); /* 20 */
220 GG (a, b, c, d, x[ 1], S21); /* 21 */
221 GG (d, a, b, c, x[ 5], S22); /* 22 */
222 GG (c, d, a, b, x[ 9], S23); /* 23 */
223 GG (b, c, d, a, x[13], S24); /* 24 */
224 GG (a, b, c, d, x[ 2], S21); /* 25 */
225 GG (d, a, b, c, x[ 6], S22); /* 26 */
226 GG (c, d, a, b, x[10], S23); /* 27 */
227 GG (b, c, d, a, x[14], S24); /* 28 */
228 GG (a, b, c, d, x[ 3], S21); /* 29 */
229 GG (d, a, b, c, x[ 7], S22); /* 30 */
230 GG (c, d, a, b, x[11], S23); /* 31 */
231 GG (b, c, d, a, x[15], S24); /* 32 */
234 HH (a, b, c, d, x[ 0], S31); /* 33 */
235 HH (d, a, b, c, x[ 8], S32); /* 34 */
236 HH (c, d, a, b, x[ 4], S33); /* 35 */
237 HH (b, c, d, a, x[12], S34); /* 36 */
238 HH (a, b, c, d, x[ 2], S31); /* 37 */
239 HH (d, a, b, c, x[10], S32); /* 38 */
240 HH (c, d, a, b, x[ 6], S33); /* 39 */
241 HH (b, c, d, a, x[14], S34); /* 40 */
242 HH (a, b, c, d, x[ 1], S31); /* 41 */
243 HH (d, a, b, c, x[ 9], S32); /* 42 */
244 HH (c, d, a, b, x[ 5], S33); /* 43 */
245 HH (b, c, d, a, x[13], S34); /* 44 */
246 HH (a, b, c, d, x[ 3], S31); /* 45 */
247 HH (d, a, b, c, x[11], S32); /* 46 */
248 HH (c, d, a, b, x[ 7], S33); /* 47 */
249 HH (b, c, d, a, x[15], S34); /* 48 */
251 ostate[0] = state[0] + a;
252 ostate[1] = state[1] + b;
253 ostate[2] = state[2] + c;
254 ostate[3] = state[3] + d;
257 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
260 static void Decode (output, input, len)
263 const unsigned char *input;
268 for (i = 0, j = 0; j < len; i++, j += 4)
269 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
270 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);