1 /*
2 Unix SMB/Netbios implementation.
3 Version 1.9.
4 a implementation of MD4 designed for use in the SMB authentication protocol
5 Copyright (C) Andrew Tridgell 1997-1998.
6 Modified by Steve French (sfrench@us.ibm.com) 2002-2003
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22 #include <linux/module.h>
23 #include <linux/fs.h>
24 #include "cifsencrypt.h"
25
26 /* NOTE: This code makes no attempt to be fast! */
27
28 static __u32
29 F(__u32 X, __u32 Y, __u32 Z)
30 {
31 return (X & Y) | ((~X) & Z);
32 }
33
34 static __u32
35 G(__u32 X, __u32 Y, __u32 Z)
36 {
37 return (X & Y) | (X & Z) | (Y & Z);
38 }
39
40 static __u32
41 H(__u32 X, __u32 Y, __u32 Z)
42 {
43 return X ^ Y ^ Z;
44 }
45
46 static __u32
47 lshift(__u32 x, int s)
48 {
49 x &= 0xFFFFFFFF;
50 return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
51 }
52
53 #define ROUND1(a,b,c,d,k,s) (*a) = lshift((*a) + F(*b,*c,*d) + X[k], s)
54 #define ROUND2(a,b,c,d,k,s) (*a) = lshift((*a) + G(*b,*c,*d) + X[k] + (__u32)0x5A827999,s)
55 #define ROUND3(a,b,c,d,k,s) (*a) = lshift((*a) + H(*b,*c,*d) + X[k] + (__u32)0x6ED9EBA1,s)
56
57 /* this applies md4 to 64 byte chunks */
58 static void
59 mdfour64(__u32 *M, __u32 *A, __u32 *B, __u32 *C, __u32 *D)
60 {
61 int j;
62 __u32 AA, BB, CC, DD;
63 __u32 X[16];
64
65
66 for (j = 0; j < 16; j++)
67 X[j] = M[j];
68
69 AA = *A;
70 BB = *B;
71 CC = *C;
72 DD = *D;
73
74 ROUND1(A, B, C, D, 0, 3);
75 ROUND1(D, A, B, C, 1, 7);
76 ROUND1(C, D, A, B, 2, 11);
77 ROUND1(B, C, D, A, 3, 19);
78 ROUND1(A, B, C, D, 4, 3);
79 ROUND1(D, A, B, C, 5, 7);
80 ROUND1(C, D, A, B, 6, 11);
81 ROUND1(B, C, D, A, 7, 19);
82 ROUND1(A, B, C, D, 8, 3);
83 ROUND1(D, A, B, C, 9, 7);
84 ROUND1(C, D, A, B, 10, 11);
85 ROUND1(B, C, D, A, 11, 19);
86 ROUND1(A, B, C, D, 12, 3);
87 ROUND1(D, A, B, C, 13, 7);
88 ROUND1(C, D, A, B, 14, 11);
89 ROUND1(B, C, D, A, 15, 19);
90
91 ROUND2(A, B, C, D, 0, 3);
92 ROUND2(D, A, B, C, 4, 5);
93 ROUND2(C, D, A, B, 8, 9);
94 ROUND2(B, C, D, A, 12, 13);
95 ROUND2(A, B, C, D, 1, 3);
96 ROUND2(D, A, B, C, 5, 5);
97 ROUND2(C, D, A, B, 9, 9);
98 ROUND2(B, C, D, A, 13, 13);
99 ROUND2(A, B, C, D, 2, 3);
100 ROUND2(D, A, B, C, 6, 5);
101 ROUND2(C, D, A, B, 10, 9);
102 ROUND2(B, C, D, A, 14, 13);
103 ROUND2(A, B, C, D, 3, 3);
104 ROUND2(D, A, B, C, 7, 5);
105 ROUND2(C, D, A, B, 11, 9);
106 ROUND2(B, C, D, A, 15, 13);
107
108 ROUND3(A, B, C, D, 0, 3);
109 ROUND3(D, A, B, C, 8, 9);
110 ROUND3(C, D, A, B, 4, 11);
111 ROUND3(B, C, D, A, 12, 15);
112 ROUND3(A, B, C, D, 2, 3);
113 ROUND3(D, A, B, C, 10, 9);
114 ROUND3(C, D, A, B, 6, 11);
115 ROUND3(B, C, D, A, 14, 15);
116 ROUND3(A, B, C, D, 1, 3);
117 ROUND3(D, A, B, C, 9, 9);
118 ROUND3(C, D, A, B, 5, 11);
119 ROUND3(B, C, D, A, 13, 15);
120 ROUND3(A, B, C, D, 3, 3);
121 ROUND3(D, A, B, C, 11, 9);
122 ROUND3(C, D, A, B, 7, 11);
123 ROUND3(B, C, D, A, 15, 15);
124
125 *A += AA;
126 *B += BB;
127 *C += CC;
128 *D += DD;
129
130 *A &= 0xFFFFFFFF;
131 *B &= 0xFFFFFFFF;
132 *C &= 0xFFFFFFFF;
133 *D &= 0xFFFFFFFF;
134
135 for (j = 0; j < 16; j++)
136 X[j] = 0;
137 }
138
139 static void
140 copy64(__u32 *M, unsigned char *in)
141 {
142 int i;
143
144 for (i = 0; i < 16; i++)
145 M[i] = (in[i * 4 + 3] << 24) | (in[i * 4 + 2] << 16) |
146 (in[i * 4 + 1] << 8) | (in[i * 4 + 0] << 0);
147 }
148
149 static void
150 copy4(unsigned char *out, __u32 x)
151 {
152 out[0] = x & 0xFF;
153 out[1] = (x >> 8) & 0xFF;
154 out[2] = (x >> 16) & 0xFF;
155 out[3] = (x >> 24) & 0xFF;
156 }
157
158 /* produce a md4 message digest from data of length n bytes */
159 void
160 mdfour(unsigned char *out, unsigned char *in, int n)
161 {
162 unsigned char buf[128];
163 __u32 M[16];
164 __u32 b = n * 8;
165 int i;
166 __u32 A = 0x67452301;
167 __u32 B = 0xefcdab89;
168 __u32 C = 0x98badcfe;
169 __u32 D = 0x10325476;
170
171 while (n > 64) {
172 copy64(M, in);
173 mdfour64(M, &A, &B, &C, &D);
174 in += 64;
175 n -= 64;
176 }
177
178 for (i = 0; i < 128; i++)
179 buf[i] = 0;
180 memcpy(buf, in, n);
181 buf[n] = 0x80;
182
183 if (n <= 55) {
184 copy4(buf + 56, b);
185 copy64(M, buf);
186 mdfour64(M, &A, &B, &C, &D);
187 } else {
188 copy4(buf + 120, b);
189 copy64(M, buf);
190 mdfour64(M, &A, &B, &C, &D);
191 copy64(M, buf + 64);
192 mdfour64(M, &A, &B, &C, &D);
193 }
194
195 for (i = 0; i < 128; i++)
196 buf[i] = 0;
197 copy64(M, buf);
198
199 copy4(out, A);
200 copy4(out + 4, B);
201 copy4(out + 8, C);
202 copy4(out + 12, D);
203
204 A = B = C = D = 0;
205 }
206
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