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04e4e140 | 1 | /* |
ef57eb7b | 2 | * Copyright (C) 1996-2016 The Squid Software Foundation and contributors |
04e4e140 AJ |
3 | * |
4 | * Squid software is distributed under GPLv2+ license and includes | |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
7 | */ | |
75072239 | 8 | |
26ac0430 | 9 | /* |
94439e4e | 10 | * Unix SMB/Netbios implementation. |
11 | * Version 1.9. | |
12 | * a implementation of MD4 designed for use in the SMB authentication protocol | |
13 | * Copyright (C) Andrew Tridgell 1997 | |
04e4e140 AJ |
14 | */ |
15 | ||
16 | /* | |
94439e4e | 17 | * This program is free software; you can redistribute it and/or modify |
18 | * it under the terms of the GNU General Public License as published by | |
19 | * the Free Software Foundation; either version 2 of the License, or | |
20 | * (at your option) any later version. | |
26ac0430 | 21 | * |
94439e4e | 22 | * This program is distributed in the hope that it will be useful, |
23 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25 | * GNU General Public License for more details. | |
26ac0430 | 26 | * |
94439e4e | 27 | * You should have received a copy of the GNU General Public License |
28 | * along with this program; if not, write to the Free Software | |
29 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
30 | */ | |
31 | ||
04e4e140 | 32 | #include "squid.h" |
5b4834ee | 33 | #include <string.h> |
7c16470c | 34 | #include "smblib/md4.h" |
94439e4e | 35 | |
26ac0430 AJ |
36 | /* NOTE: This code makes no attempt to be fast! |
37 | * | |
94439e4e | 38 | * It assumes that a int is at least 32 bits long |
39 | */ | |
40 | ||
41 | typedef unsigned int uint32; | |
42 | ||
43 | static uint32 A, B, C, D; | |
44 | ||
45 | static uint32 | |
46 | F(uint32 X, uint32 Y, uint32 Z) | |
47 | { | |
48 | return (X & Y) | ((~X) & Z); | |
49 | } | |
50 | ||
51 | static uint32 | |
52 | G(uint32 X, uint32 Y, uint32 Z) | |
53 | { | |
54 | return (X & Y) | (X & Z) | (Y & Z); | |
55 | } | |
56 | ||
57 | static uint32 | |
58 | H(uint32 X, uint32 Y, uint32 Z) | |
59 | { | |
60 | return X ^ Y ^ Z; | |
61 | } | |
62 | ||
63 | static uint32 | |
64 | lshift(uint32 x, int s) | |
65 | { | |
66 | x &= 0xFFFFFFFF; | |
67 | return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s)); | |
68 | } | |
69 | ||
70 | #define ROUND1(a,b,c,d,k,s) a = lshift(a + F(b,c,d) + X[k], s) | |
71 | #define ROUND2(a,b,c,d,k,s) a = lshift(a + G(b,c,d) + X[k] + (uint32)0x5A827999,s) | |
72 | #define ROUND3(a,b,c,d,k,s) a = lshift(a + H(b,c,d) + X[k] + (uint32)0x6ED9EBA1,s) | |
73 | ||
74 | /* this applies md4 to 64 byte chunks */ | |
75 | static void | |
76 | mdfour64(uint32 * M) | |
77 | { | |
78 | int j; | |
79 | uint32 AA, BB, CC, DD; | |
80 | uint32 X[16]; | |
81 | ||
82 | for (j = 0; j < 16; j++) | |
26ac0430 | 83 | X[j] = M[j]; |
94439e4e | 84 | |
85 | AA = A; | |
86 | BB = B; | |
87 | CC = C; | |
88 | DD = D; | |
89 | ||
90 | ROUND1(A, B, C, D, 0, 3); | |
91 | ROUND1(D, A, B, C, 1, 7); | |
92 | ROUND1(C, D, A, B, 2, 11); | |
93 | ROUND1(B, C, D, A, 3, 19); | |
94 | ROUND1(A, B, C, D, 4, 3); | |
95 | ROUND1(D, A, B, C, 5, 7); | |
96 | ROUND1(C, D, A, B, 6, 11); | |
97 | ROUND1(B, C, D, A, 7, 19); | |
98 | ROUND1(A, B, C, D, 8, 3); | |
99 | ROUND1(D, A, B, C, 9, 7); | |
100 | ROUND1(C, D, A, B, 10, 11); | |
101 | ROUND1(B, C, D, A, 11, 19); | |
102 | ROUND1(A, B, C, D, 12, 3); | |
103 | ROUND1(D, A, B, C, 13, 7); | |
104 | ROUND1(C, D, A, B, 14, 11); | |
105 | ROUND1(B, C, D, A, 15, 19); | |
106 | ||
107 | ROUND2(A, B, C, D, 0, 3); | |
108 | ROUND2(D, A, B, C, 4, 5); | |
109 | ROUND2(C, D, A, B, 8, 9); | |
110 | ROUND2(B, C, D, A, 12, 13); | |
111 | ROUND2(A, B, C, D, 1, 3); | |
112 | ROUND2(D, A, B, C, 5, 5); | |
113 | ROUND2(C, D, A, B, 9, 9); | |
114 | ROUND2(B, C, D, A, 13, 13); | |
115 | ROUND2(A, B, C, D, 2, 3); | |
116 | ROUND2(D, A, B, C, 6, 5); | |
117 | ROUND2(C, D, A, B, 10, 9); | |
118 | ROUND2(B, C, D, A, 14, 13); | |
119 | ROUND2(A, B, C, D, 3, 3); | |
120 | ROUND2(D, A, B, C, 7, 5); | |
121 | ROUND2(C, D, A, B, 11, 9); | |
122 | ROUND2(B, C, D, A, 15, 13); | |
123 | ||
124 | ROUND3(A, B, C, D, 0, 3); | |
125 | ROUND3(D, A, B, C, 8, 9); | |
126 | ROUND3(C, D, A, B, 4, 11); | |
127 | ROUND3(B, C, D, A, 12, 15); | |
128 | ROUND3(A, B, C, D, 2, 3); | |
129 | ROUND3(D, A, B, C, 10, 9); | |
130 | ROUND3(C, D, A, B, 6, 11); | |
131 | ROUND3(B, C, D, A, 14, 15); | |
132 | ROUND3(A, B, C, D, 1, 3); | |
133 | ROUND3(D, A, B, C, 9, 9); | |
134 | ROUND3(C, D, A, B, 5, 11); | |
135 | ROUND3(B, C, D, A, 13, 15); | |
136 | ROUND3(A, B, C, D, 3, 3); | |
137 | ROUND3(D, A, B, C, 11, 9); | |
138 | ROUND3(C, D, A, B, 7, 11); | |
139 | ROUND3(B, C, D, A, 15, 15); | |
140 | ||
141 | A += AA; | |
142 | B += BB; | |
143 | C += CC; | |
144 | D += DD; | |
145 | ||
146 | A &= 0xFFFFFFFF; | |
147 | B &= 0xFFFFFFFF; | |
148 | C &= 0xFFFFFFFF; | |
149 | D &= 0xFFFFFFFF; | |
150 | ||
151 | for (j = 0; j < 16; j++) | |
26ac0430 | 152 | X[j] = 0; |
94439e4e | 153 | } |
154 | ||
155 | static void | |
156 | copy64(uint32 * M, unsigned char *in) | |
157 | { | |
158 | int i; | |
159 | ||
160 | for (i = 0; i < 16; i++) | |
26ac0430 AJ |
161 | M[i] = (in[i * 4 + 3] << 24) | (in[i * 4 + 2] << 16) | |
162 | (in[i * 4 + 1] << 8) | (in[i * 4 + 0] << 0); | |
94439e4e | 163 | } |
164 | ||
165 | static void | |
166 | copy4(unsigned char *out, uint32 x) | |
167 | { | |
168 | out[0] = x & 0xFF; | |
169 | out[1] = (x >> 8) & 0xFF; | |
170 | out[2] = (x >> 16) & 0xFF; | |
171 | out[3] = (x >> 24) & 0xFF; | |
172 | } | |
173 | ||
174 | /* produce a md4 message digest from data of length n bytes */ | |
175 | void | |
176 | mdfour(unsigned char *out, unsigned char *in, int n) | |
177 | { | |
178 | unsigned char buf[128]; | |
179 | uint32 M[16]; | |
180 | uint32 b = n * 8; | |
181 | int i; | |
182 | ||
183 | A = 0x67452301; | |
184 | B = 0xefcdab89; | |
185 | C = 0x98badcfe; | |
186 | D = 0x10325476; | |
187 | ||
188 | while (n > 64) { | |
26ac0430 AJ |
189 | copy64(M, in); |
190 | mdfour64(M); | |
191 | in += 64; | |
192 | n -= 64; | |
94439e4e | 193 | } |
194 | ||
195 | for (i = 0; i < 128; i++) | |
26ac0430 | 196 | buf[i] = 0; |
94439e4e | 197 | memcpy(buf, in, n); |
198 | buf[n] = 0x80; | |
199 | ||
200 | if (n <= 55) { | |
26ac0430 AJ |
201 | copy4(buf + 56, b); |
202 | copy64(M, buf); | |
203 | mdfour64(M); | |
94439e4e | 204 | } else { |
26ac0430 AJ |
205 | copy4(buf + 120, b); |
206 | copy64(M, buf); | |
207 | mdfour64(M); | |
208 | copy64(M, buf + 64); | |
209 | mdfour64(M); | |
94439e4e | 210 | } |
211 | ||
212 | for (i = 0; i < 128; i++) | |
26ac0430 | 213 | buf[i] = 0; |
94439e4e | 214 | copy64(M, buf); |
215 | ||
216 | copy4(out, A); | |
217 | copy4(out + 4, B); | |
218 | copy4(out + 8, C); | |
219 | copy4(out + 12, D); | |
220 | ||
221 | A = B = C = D = 0; | |
222 | } | |
f53969cc | 223 |