4 An implementation of MD4 designed for use in the samba SMB
5 authentication protocol
7 Copyright (C) 1997-1998 Andrew Tridgell
9 This program is free software; you can redistribute it and/or
10 modify it under the terms of the GNU General Public License
11 as published by the Free Software Foundation; either version 2
12 of the License, or (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
18 See the GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to:
23 Free Software Foundation, Inc.
24 59 Temple Place - Suite 330
25 Boston, MA 02111-1307, USA
30 #include <string.h> /* XoXus: needed for memset call */
33 /* NOTE: This code makes no attempt to be fast!
35 It assumes that a int is at least 32 bits long
38 static struct mdfour *m;
40 #define F(X,Y,Z) (((X)&(Y)) | ((~(X))&(Z)))
41 #define G(X,Y,Z) (((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z)))
42 #define H(X,Y,Z) ((X)^(Y)^(Z))
44 #define lshift(x,s) ((((x)<<(s))&0xFFFFFFFF) | (((x)>>(32-(s)))&0xFFFFFFFF))
46 #define lshift(x,s) (((x)<<(s)) | ((x)>>(32-(s))))
49 #define ROUND1(a,b,c,d,k,s) a = lshift(a + F(b,c,d) + X[k], s)
50 #define ROUND2(a,b,c,d,k,s) a = lshift(a + G(b,c,d) + X[k] + 0x5A827999,s)
51 #define ROUND3(a,b,c,d,k,s) a = lshift(a + H(b,c,d) + X[k] + 0x6ED9EBA1,s)
53 /* this applies md4 to 64 byte chunks */
54 static void mdfour64(uint32 *M)
57 uint32 AA, BB, CC, DD;
64 A = m->A; B = m->B; C = m->C; D = m->D;
65 AA = A; BB = B; CC = C; DD = D;
67 ROUND1(A,B,C,D, 0, 3); ROUND1(D,A,B,C, 1, 7);
68 ROUND1(C,D,A,B, 2, 11); ROUND1(B,C,D,A, 3, 19);
69 ROUND1(A,B,C,D, 4, 3); ROUND1(D,A,B,C, 5, 7);
70 ROUND1(C,D,A,B, 6, 11); ROUND1(B,C,D,A, 7, 19);
71 ROUND1(A,B,C,D, 8, 3); ROUND1(D,A,B,C, 9, 7);
72 ROUND1(C,D,A,B, 10, 11); ROUND1(B,C,D,A, 11, 19);
73 ROUND1(A,B,C,D, 12, 3); ROUND1(D,A,B,C, 13, 7);
74 ROUND1(C,D,A,B, 14, 11); ROUND1(B,C,D,A, 15, 19);
76 ROUND2(A,B,C,D, 0, 3); ROUND2(D,A,B,C, 4, 5);
77 ROUND2(C,D,A,B, 8, 9); ROUND2(B,C,D,A, 12, 13);
78 ROUND2(A,B,C,D, 1, 3); ROUND2(D,A,B,C, 5, 5);
79 ROUND2(C,D,A,B, 9, 9); ROUND2(B,C,D,A, 13, 13);
80 ROUND2(A,B,C,D, 2, 3); ROUND2(D,A,B,C, 6, 5);
81 ROUND2(C,D,A,B, 10, 9); ROUND2(B,C,D,A, 14, 13);
82 ROUND2(A,B,C,D, 3, 3); ROUND2(D,A,B,C, 7, 5);
83 ROUND2(C,D,A,B, 11, 9); ROUND2(B,C,D,A, 15, 13);
85 ROUND3(A,B,C,D, 0, 3); ROUND3(D,A,B,C, 8, 9);
86 ROUND3(C,D,A,B, 4, 11); ROUND3(B,C,D,A, 12, 15);
87 ROUND3(A,B,C,D, 2, 3); ROUND3(D,A,B,C, 10, 9);
88 ROUND3(C,D,A,B, 6, 11); ROUND3(B,C,D,A, 14, 15);
89 ROUND3(A,B,C,D, 1, 3); ROUND3(D,A,B,C, 9, 9);
90 ROUND3(C,D,A,B, 5, 11); ROUND3(B,C,D,A, 13, 15);
91 ROUND3(A,B,C,D, 3, 3); ROUND3(D,A,B,C, 11, 9);
92 ROUND3(C,D,A,B, 7, 11); ROUND3(B,C,D,A, 15, 15);
94 A += AA; B += BB; C += CC; D += DD;
97 A &= 0xFFFFFFFF; B &= 0xFFFFFFFF;
98 C &= 0xFFFFFFFF; D &= 0xFFFFFFFF;
104 m->A = A; m->B = B; m->C = C; m->D = D;
107 static void copy64(uint32 *M, unsigned char *in)
112 M[i] = (in[i*4+3]<<24) | (in[i*4+2]<<16) |
113 (in[i*4+1]<<8) | (in[i*4+0]<<0);
116 static void copy4(unsigned char *out,uint32 x)
119 out[1] = (x>>8)&0xFF;
120 out[2] = (x>>16)&0xFF;
121 out[3] = (x>>24)&0xFF;
124 void mdfour_begin(struct mdfour *md)
134 static void mdfour_tail(unsigned char *in, int n)
136 unsigned char buf[128];
145 if (n) memcpy(buf, in, n);
161 void mdfour_update(struct mdfour *md, unsigned char *in, int n)
165 // start of edit by Forest 'LordHavoc' Hale
166 // commented out to prevent crashing when length is 0
167 // if (n == 0) mdfour_tail(in, n);
168 // end of edit by Forest 'LordHavoc' Hale
184 void mdfour_result(struct mdfour *md, unsigned char *out)
195 void mdfour(unsigned char *out, unsigned char *in, int n)
199 mdfour_update(&md, in, n);
200 mdfour_result(&md, out);
203 ///////////////////////////////////////////////////////////////
204 // MD4-based checksum utility functions
206 // Copyright (C) 2000 Jeff Teunissen <d2deek@pmail.net>
208 // Author: Jeff Teunissen <d2deek@pmail.net>
211 unsigned Com_BlockChecksum (void *buffer, int length)
216 mdfour ( (unsigned char *) digest, (unsigned char *) buffer, length );
218 val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
223 void Com_BlockFullChecksum (void *buffer, int len, unsigned char *outbuf)
225 mdfour ( outbuf, (unsigned char *) buffer, len );