255 lines
5.8 KiB
C
255 lines
5.8 KiB
C
/*
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mdfour.c
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An implementation of MD4 designed for use in the samba SMB
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authentication protocol
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Copyright (C) 1997-1998 Andrew Tridgell
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id$
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*/
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#include "qtv.h"
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#include <string.h> /* XoXus: needed for memset call */
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#ifndef _MDFOUR_H
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#define _MDFOUR_H
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#ifndef int32
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#define int32 int
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#endif
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#if SIZEOF_INT > 4
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#define LARGE_INT32
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#endif
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#ifndef uint32
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#define uint32 unsigned int32
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#endif
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struct mdfour {
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uint32 A, B, C, D;
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uint32 totalN;
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};
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static void mdfour_begin(struct mdfour *md); // old: MD4Init
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static void mdfour_update(struct mdfour *md, unsigned char *in, int n); //old: MD4Update
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static void mdfour_result(struct mdfour *md, unsigned char *out); // old: MD4Final
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static void mdfour(unsigned char *out, unsigned char *in, int n);
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#endif // _MDFOUR_H
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/* NOTE: This code makes no attempt to be fast!
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It assumes that a int is at least 32 bits long
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*/
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#define F(X,Y,Z) (((X)&(Y)) | ((~(X))&(Z)))
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#define G(X,Y,Z) (((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z)))
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#define H(X,Y,Z) ((X)^(Y)^(Z))
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#ifdef LARGE_INT32
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#define lshift(x,s) ((((x)<<(s))&0xFFFFFFFF) | (((x)>>(32-(s)))&0xFFFFFFFF))
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#else
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#define lshift(x,s) (((x)<<(s)) | ((x)>>(32-(s))))
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#endif
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#define ROUND1(a,b,c,d,k,s) a = lshift(a + F(b,c,d) + X[k], s)
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#define ROUND2(a,b,c,d,k,s) a = lshift(a + G(b,c,d) + X[k] + 0x5A827999,s)
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#define ROUND3(a,b,c,d,k,s) a = lshift(a + H(b,c,d) + X[k] + 0x6ED9EBA1,s)
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/* this applies md4 to 64 byte chunks */
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static void mdfour64(struct mdfour *m, uint32 *M)
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{
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int j;
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uint32 AA, BB, CC, DD;
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uint32 X[16];
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uint32 A,B,C,D;
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for (j=0;j<16;j++)
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X[j] = M[j];
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A = m->A; B = m->B; C = m->C; D = m->D;
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AA = A; BB = B; CC = C; DD = D;
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ROUND1(A,B,C,D, 0, 3); ROUND1(D,A,B,C, 1, 7);
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ROUND1(C,D,A,B, 2, 11); ROUND1(B,C,D,A, 3, 19);
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ROUND1(A,B,C,D, 4, 3); ROUND1(D,A,B,C, 5, 7);
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ROUND1(C,D,A,B, 6, 11); ROUND1(B,C,D,A, 7, 19);
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ROUND1(A,B,C,D, 8, 3); ROUND1(D,A,B,C, 9, 7);
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ROUND1(C,D,A,B, 10, 11); ROUND1(B,C,D,A, 11, 19);
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ROUND1(A,B,C,D, 12, 3); ROUND1(D,A,B,C, 13, 7);
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ROUND1(C,D,A,B, 14, 11); ROUND1(B,C,D,A, 15, 19);
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ROUND2(A,B,C,D, 0, 3); ROUND2(D,A,B,C, 4, 5);
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ROUND2(C,D,A,B, 8, 9); ROUND2(B,C,D,A, 12, 13);
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ROUND2(A,B,C,D, 1, 3); ROUND2(D,A,B,C, 5, 5);
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ROUND2(C,D,A,B, 9, 9); ROUND2(B,C,D,A, 13, 13);
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ROUND2(A,B,C,D, 2, 3); ROUND2(D,A,B,C, 6, 5);
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ROUND2(C,D,A,B, 10, 9); ROUND2(B,C,D,A, 14, 13);
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ROUND2(A,B,C,D, 3, 3); ROUND2(D,A,B,C, 7, 5);
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ROUND2(C,D,A,B, 11, 9); ROUND2(B,C,D,A, 15, 13);
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ROUND3(A,B,C,D, 0, 3); ROUND3(D,A,B,C, 8, 9);
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ROUND3(C,D,A,B, 4, 11); ROUND3(B,C,D,A, 12, 15);
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ROUND3(A,B,C,D, 2, 3); ROUND3(D,A,B,C, 10, 9);
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ROUND3(C,D,A,B, 6, 11); ROUND3(B,C,D,A, 14, 15);
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ROUND3(A,B,C,D, 1, 3); ROUND3(D,A,B,C, 9, 9);
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ROUND3(C,D,A,B, 5, 11); ROUND3(B,C,D,A, 13, 15);
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ROUND3(A,B,C,D, 3, 3); ROUND3(D,A,B,C, 11, 9);
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ROUND3(C,D,A,B, 7, 11); ROUND3(B,C,D,A, 15, 15);
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A += AA; B += BB; C += CC; D += DD;
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#ifdef LARGE_INT32
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A &= 0xFFFFFFFF; B &= 0xFFFFFFFF;
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C &= 0xFFFFFFFF; D &= 0xFFFFFFFF;
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#endif
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for (j=0;j<16;j++)
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X[j] = 0;
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m->A = A; m->B = B; m->C = C; m->D = D;
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}
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static void copy64(uint32 *M, unsigned char *in)
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{
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int i;
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for (i=0;i<16;i++)
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M[i] = (in[i*4+3]<<24) | (in[i*4+2]<<16) |
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(in[i*4+1]<<8) | (in[i*4+0]<<0);
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}
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static void copy4(unsigned char *out,uint32 x)
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{
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out[0] = x&0xFF;
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out[1] = (x>>8)&0xFF;
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out[2] = (x>>16)&0xFF;
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out[3] = (x>>24)&0xFF;
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}
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static void mdfour_begin(struct mdfour *md)
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{
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md->A = 0x67452301;
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md->B = 0xefcdab89;
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md->C = 0x98badcfe;
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md->D = 0x10325476;
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md->totalN = 0;
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}
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static void mdfour_tail(struct mdfour *m, unsigned char *in, int n)
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{
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unsigned char buf[128];
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uint32 M[16];
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uint32 b;
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m->totalN += n;
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b = m->totalN * 8;
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memset(buf, 0, 128);
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if (n) memcpy(buf, in, n);
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buf[n] = 0x80;
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if (n <= 55)
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{
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copy4(buf+56, b);
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copy64(M, buf);
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mdfour64(m, M);
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}
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else
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{
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copy4(buf+120, b);
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copy64(M, buf);
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mdfour64(m, M);
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copy64(M, buf+64);
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mdfour64(m, M);
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}
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}
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static void mdfour_update(struct mdfour *m, unsigned char *in, int n)
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{
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uint32 M[16];
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// if (n == 0) mdfour_tail(in, n); //Spike: This is where the bug was.
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while (n >= 64)
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{
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copy64(M, in);
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mdfour64(m, M);
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in += 64;
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n -= 64;
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m->totalN += 64;
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}
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mdfour_tail(m, in, n);
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}
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static void mdfour_result(struct mdfour *m, unsigned char *out)
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{
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copy4(out, m->A);
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copy4(out+4, m->B);
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copy4(out+8, m->C);
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copy4(out+12, m->D);
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}
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static void mdfour(unsigned char *out, unsigned char *in, int n)
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{
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struct mdfour md;
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mdfour_begin(&md);
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mdfour_update(&md, in, n);
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mdfour_result(&md, out);
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}
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///////////////////////////////////////////////////////////////
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// MD4-based checksum utility functions
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//
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// Copyright (C) 2000 Jeff Teunissen <d2deek@pmail.net>
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//
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// Author: Jeff Teunissen <d2deek@pmail.net>
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// Date: 01 Jan 2000
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unsigned Com_BlockChecksum (void *buffer, int length)
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{
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int digest[4];
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unsigned val;
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mdfour ( (unsigned char *) digest, (unsigned char *) buffer, length );
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val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
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return val;
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}
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void Com_BlockFullChecksum (void *buffer, int len, unsigned char *outbuf)
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{
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mdfour ( outbuf, (unsigned char *) buffer, len );
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}
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