source: trunk/server/lib/crypto/md4.c@ 707

Last change on this file since 707 was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 5.0 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3 a implementation of MD4 designed for use in the SMB authentication protocol
4 Copyright (C) Andrew Tridgell 1997-1998.
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18*/
19
20#include "includes.h"
21#include "../lib/crypto/md4.h"
22
23/* NOTE: This code makes no attempt to be fast!
24
25 It assumes that a int is at least 32 bits long
26*/
27
28struct mdfour_state {
29 uint32_t A, B, C, D;
30};
31
32static uint32_t F(uint32_t X, uint32_t Y, uint32_t Z)
33{
34 return (X&Y) | ((~X)&Z);
35}
36
37static uint32_t G(uint32_t X, uint32_t Y, uint32_t Z)
38{
39 return (X&Y) | (X&Z) | (Y&Z);
40}
41
42static uint32_t H(uint32_t X, uint32_t Y, uint32_t Z)
43{
44 return X^Y^Z;
45}
46
47static uint32_t lshift(uint32_t 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] + (uint32_t)0x5A827999,s)
55#define ROUND3(a,b,c,d,k,s) a = lshift(a + H(b,c,d) + X[k] + (uint32_t)0x6ED9EBA1,s)
56
57/* this applies md4 to 64 byte chunks */
58static void mdfour64(struct mdfour_state *s, uint32_t *M)
59{
60 int j;
61 uint32_t AA, BB, CC, DD;
62 uint32_t X[16];
63
64 for (j=0;j<16;j++)
65 X[j] = M[j];
66
67 AA = s->A; BB = s->B; CC = s->C; DD = s->D;
68
69 ROUND1(s->A,s->B,s->C,s->D, 0, 3); ROUND1(s->D,s->A,s->B,s->C, 1, 7);
70 ROUND1(s->C,s->D,s->A,s->B, 2, 11); ROUND1(s->B,s->C,s->D,s->A, 3, 19);
71 ROUND1(s->A,s->B,s->C,s->D, 4, 3); ROUND1(s->D,s->A,s->B,s->C, 5, 7);
72 ROUND1(s->C,s->D,s->A,s->B, 6, 11); ROUND1(s->B,s->C,s->D,s->A, 7, 19);
73 ROUND1(s->A,s->B,s->C,s->D, 8, 3); ROUND1(s->D,s->A,s->B,s->C, 9, 7);
74 ROUND1(s->C,s->D,s->A,s->B, 10, 11); ROUND1(s->B,s->C,s->D,s->A, 11, 19);
75 ROUND1(s->A,s->B,s->C,s->D, 12, 3); ROUND1(s->D,s->A,s->B,s->C, 13, 7);
76 ROUND1(s->C,s->D,s->A,s->B, 14, 11); ROUND1(s->B,s->C,s->D,s->A, 15, 19);
77
78 ROUND2(s->A,s->B,s->C,s->D, 0, 3); ROUND2(s->D,s->A,s->B,s->C, 4, 5);
79 ROUND2(s->C,s->D,s->A,s->B, 8, 9); ROUND2(s->B,s->C,s->D,s->A, 12, 13);
80 ROUND2(s->A,s->B,s->C,s->D, 1, 3); ROUND2(s->D,s->A,s->B,s->C, 5, 5);
81 ROUND2(s->C,s->D,s->A,s->B, 9, 9); ROUND2(s->B,s->C,s->D,s->A, 13, 13);
82 ROUND2(s->A,s->B,s->C,s->D, 2, 3); ROUND2(s->D,s->A,s->B,s->C, 6, 5);
83 ROUND2(s->C,s->D,s->A,s->B, 10, 9); ROUND2(s->B,s->C,s->D,s->A, 14, 13);
84 ROUND2(s->A,s->B,s->C,s->D, 3, 3); ROUND2(s->D,s->A,s->B,s->C, 7, 5);
85 ROUND2(s->C,s->D,s->A,s->B, 11, 9); ROUND2(s->B,s->C,s->D,s->A, 15, 13);
86
87 ROUND3(s->A,s->B,s->C,s->D, 0, 3); ROUND3(s->D,s->A,s->B,s->C, 8, 9);
88 ROUND3(s->C,s->D,s->A,s->B, 4, 11); ROUND3(s->B,s->C,s->D,s->A, 12, 15);
89 ROUND3(s->A,s->B,s->C,s->D, 2, 3); ROUND3(s->D,s->A,s->B,s->C, 10, 9);
90 ROUND3(s->C,s->D,s->A,s->B, 6, 11); ROUND3(s->B,s->C,s->D,s->A, 14, 15);
91 ROUND3(s->A,s->B,s->C,s->D, 1, 3); ROUND3(s->D,s->A,s->B,s->C, 9, 9);
92 ROUND3(s->C,s->D,s->A,s->B, 5, 11); ROUND3(s->B,s->C,s->D,s->A, 13, 15);
93 ROUND3(s->A,s->B,s->C,s->D, 3, 3); ROUND3(s->D,s->A,s->B,s->C, 11, 9);
94 ROUND3(s->C,s->D,s->A,s->B, 7, 11); ROUND3(s->B,s->C,s->D,s->A, 15, 15);
95
96 s->A += AA;
97 s->B += BB;
98 s->C += CC;
99 s->D += DD;
100
101 s->A &= 0xFFFFFFFF;
102 s->B &= 0xFFFFFFFF;
103 s->C &= 0xFFFFFFFF;
104 s->D &= 0xFFFFFFFF;
105
106 for (j=0;j<16;j++)
107 X[j] = 0;
108}
109
110static void copy64(uint32_t *M, const uint8_t *in)
111{
112 int i;
113
114 for (i=0;i<16;i++)
115 M[i] = (in[i*4+3]<<24) | (in[i*4+2]<<16) |
116 (in[i*4+1]<<8) | (in[i*4+0]<<0);
117}
118
119static void copy4(uint8_t *out, uint32_t x)
120{
121 out[0] = x&0xFF;
122 out[1] = (x>>8)&0xFF;
123 out[2] = (x>>16)&0xFF;
124 out[3] = (x>>24)&0xFF;
125}
126
127/**
128 * produce a md4 message digest from data of length n bytes
129 */
130_PUBLIC_ void mdfour(uint8_t *out, const uint8_t *in, int n)
131{
132 uint8_t buf[128];
133 uint32_t M[16];
134 uint32_t b = n * 8;
135 int i;
136 struct mdfour_state state;
137
138 state.A = 0x67452301;
139 state.B = 0xefcdab89;
140 state.C = 0x98badcfe;
141 state.D = 0x10325476;
142
143 while (n > 64) {
144 copy64(M, in);
145 mdfour64(&state, M);
146 in += 64;
147 n -= 64;
148 }
149
150 for (i=0;i<128;i++)
151 buf[i] = 0;
152 memcpy(buf, in, n);
153 buf[n] = 0x80;
154
155 if (n <= 55) {
156 copy4(buf+56, b);
157 copy64(M, buf);
158 mdfour64(&state, M);
159 } else {
160 copy4(buf+120, b);
161 copy64(M, buf);
162 mdfour64(&state, M);
163 copy64(M, buf+64);
164 mdfour64(&state, M);
165 }
166
167 for (i=0;i<128;i++)
168 buf[i] = 0;
169 copy64(M, buf);
170
171 copy4(out, state.A);
172 copy4(out+4, state.B);
173 copy4(out+8, state.C);
174 copy4(out+12, state.D);
175}
176
177
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