quakeforge/libs/util/checksum.c

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/*
checksum.c
CRC and MD4-based checksum utility functions
Copyright (C) 2000 Jeff Teunissen <d2deek@pmail.net>
Author: Jeff Teunissen <d2deek@pmail.net>
Date: 01 Jan 2000
Copyright (C) 1996-1997 Id Software, Inc.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to:
Free Software Foundation, Inc.
59 Temple Place - Suite 330
Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
static __attribute__ ((used)) const char rcsid[] =
"$Id$";
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include "QF/checksum.h"
#include "QF/crc.h"
#include "QF/mdfour.h"
#include "QF/qendian.h"
static byte chktbl[1024 + 4] = {
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0x78, 0xd2, 0x94, 0xe3, 0x41, 0xec, 0xd6, 0xd5,
0xcb, 0xfc, 0xdb, 0x8a, 0x4b, 0xcc, 0x85, 0x01,
0x23, 0xd2, 0xe5, 0xf2, 0x29, 0xa7, 0x45, 0x94,
0x4a, 0x62, 0xe3, 0xa5, 0x6f, 0x3f, 0xe1, 0x7a,
0x64, 0xed, 0x5c, 0x99, 0x29, 0x87, 0xa8, 0x78,
0x59, 0x0d, 0xaa, 0x0f, 0x25, 0x0a, 0x5c, 0x58,
0xfb, 0x00, 0xa7, 0xa8, 0x8a, 0x1d, 0x86, 0x80,
0xc5, 0x1f, 0xd2, 0x28, 0x69, 0x71, 0x58, 0xc3,
0x51, 0x90, 0xe1, 0xf8, 0x6a, 0xf3, 0x8f, 0xb0,
0x68, 0xdf, 0x95, 0x40, 0x5c, 0xe4, 0x24, 0x6b,
0x29, 0x19, 0x71, 0x3f, 0x42, 0x63, 0x6c, 0x48,
0xe7, 0xad, 0xa8, 0x4b, 0x91, 0x8f, 0x42, 0x36,
0x34, 0xe7, 0x32, 0x55, 0x59, 0x2d, 0x36, 0x38,
0x38, 0x59, 0x9b, 0x08, 0x16, 0x4d, 0x8d, 0xf8,
0x0a, 0xa4, 0x52, 0x01, 0xbb, 0x52, 0xa9, 0xfd,
0x40, 0x18, 0x97, 0x37, 0xff, 0xc9, 0x82, 0x27,
0xb2, 0x64, 0x60, 0xce, 0x00, 0xd9, 0x04, 0xf0,
0x9e, 0x99, 0xbd, 0xce, 0x8f, 0x90, 0x4a, 0xdd,
0xe1, 0xec, 0x19, 0x14, 0xb1, 0xfb, 0xca, 0x1e,
0x98, 0x0f, 0xd4, 0xcb, 0x80, 0xd6, 0x05, 0x63,
0xfd, 0xa0, 0x74, 0xa6, 0x86, 0xf6, 0x19, 0x98,
0x76, 0x27, 0x68, 0xf7, 0xe9, 0x09, 0x9a, 0xf2,
0x2e, 0x42, 0xe1, 0xbe, 0x64, 0x48, 0x2a, 0x74,
0x30, 0xbb, 0x07, 0xcc, 0x1f, 0xd4, 0x91, 0x9d,
0xac, 0x55, 0x53, 0x25, 0xb9, 0x64, 0xf7, 0x58,
0x4c, 0x34, 0x16, 0xbc, 0xf6, 0x12, 0x2b, 0x65,
0x68, 0x25, 0x2e, 0x29, 0x1f, 0xbb, 0xb9, 0xee,
0x6d, 0x0c, 0x8e, 0xbb, 0xd2, 0x5f, 0x1d, 0x8f,
0xc1, 0x39, 0xf9, 0x8d, 0xc0, 0x39, 0x75, 0xcf,
0x25, 0x17, 0xbe, 0x96, 0xaf, 0x98, 0x9f, 0x5f,
0x65, 0x15, 0xc4, 0x62, 0xf8, 0x55, 0xfc, 0xab,
0x54, 0xcf, 0xdc, 0x14, 0x06, 0xc8, 0xfc, 0x42,
0xd3, 0xf0, 0xad, 0x10, 0x08, 0xcd, 0xd4, 0x11,
0xbb, 0xca, 0x67, 0xc6, 0x48, 0x5f, 0x9d, 0x59,
0xe3, 0xe8, 0x53, 0x67, 0x27, 0x2d, 0x34, 0x9e,
0x9e, 0x24, 0x29, 0xdb, 0x69, 0x99, 0x86, 0xf9,
0x20, 0xb5, 0xbb, 0x5b, 0xb0, 0xf9, 0xc3, 0x67,
0xad, 0x1c, 0x9c, 0xf7, 0xcc, 0xef, 0xce, 0x69,
0xe0, 0x26, 0x8f, 0x79, 0xbd, 0xca, 0x10, 0x17,
0xda, 0xa9, 0x88, 0x57, 0x9b, 0x15, 0x24, 0xba,
0x84, 0xd0, 0xeb, 0x4d, 0x14, 0xf5, 0xfc, 0xe6,
0x51, 0x6c, 0x6f, 0x64, 0x6b, 0x73, 0xec, 0x85,
0xf1, 0x6f, 0xe1, 0x67, 0x25, 0x10, 0x77, 0x32,
0x9e, 0x85, 0x6e, 0x69, 0xb1, 0x83, 0x00, 0xe4,
0x13, 0xa4, 0x45, 0x34, 0x3b, 0x40, 0xff, 0x41,
0x82, 0x89, 0x79, 0x57, 0xfd, 0xd2, 0x8e, 0xe8,
0xfc, 0x1d, 0x19, 0x21, 0x12, 0x00, 0xd7, 0x66,
0xe5, 0xc7, 0x10, 0x1d, 0xcb, 0x75, 0xe8, 0xfa,
0xb6, 0xee, 0x7b, 0x2f, 0x1a, 0x25, 0x24, 0xb9,
0x9f, 0x1d, 0x78, 0xfb, 0x84, 0xd0, 0x17, 0x05,
0x71, 0xb3, 0xc8, 0x18, 0xff, 0x62, 0xee, 0xed,
0x53, 0xab, 0x78, 0xd3, 0x65, 0x2d, 0xbb, 0xc7,
0xc1, 0xe7, 0x70, 0xa2, 0x43, 0x2c, 0x7c, 0xc7,
0x16, 0x04, 0xd2, 0x45, 0xd5, 0x6b, 0x6c, 0x7a,
0x5e, 0xa1, 0x50, 0x2e, 0x31, 0x5b, 0xcc, 0xe8,
0x65, 0x8b, 0x16, 0x85, 0xbf, 0x82, 0x83, 0xfb,
0xde, 0x9f, 0x36, 0x48, 0x32, 0x79, 0xd6, 0x9b,
0xfb, 0x52, 0x45, 0xbf, 0x43, 0xf7, 0x0b, 0x0b,
0x19, 0x19, 0x31, 0xc3, 0x85, 0xec, 0x1d, 0x8c,
0x20, 0xf0, 0x3a, 0xfa, 0x80, 0x4d, 0x2c, 0x7d,
0xac, 0x60, 0x09, 0xc0, 0x40, 0xee, 0xb9, 0xeb,
0x13, 0x5b, 0xe8, 0x2b, 0xb1, 0x20, 0xf0, 0xce,
0x4c, 0xbd, 0xc6, 0x04, 0x86, 0x70, 0xc6, 0x33,
0xc3, 0x15, 0x0f, 0x65, 0x19, 0xfd, 0xc2, 0xd3,
// map checksum goes here
0x00, 0x00, 0x00, 0x00
};
/*
COM_BlockSequenceCRCByte
For proxy protecting
*/
byte
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COM_BlockSequenceCRCByte (const byte * base, int length, int sequence)
{
byte chkb[60 + 4];
byte *p;
unsigned short crc;
p = chktbl + (sequence % (sizeof (chktbl) - 8));
if (length > 60)
length = 60;
memcpy (chkb, base, length);
chkb[length] = (sequence & 0xff) ^ p[0];
chkb[length + 1] = p[1];
chkb[length + 2] = ((sequence >> 8) & 0xff) ^ p[2];
chkb[length + 3] = p[3];
length += 4;
crc = CRC_Block (chkb, length);
crc &= 0xff;
return (byte) crc;
}
unsigned int
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Com_BlockChecksum (const void *buffer, int length)
{
int digest[4];
unsigned int val;
mdfour ((unsigned char *) digest, (unsigned char *) buffer, length);
val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
return LittleLong (val);
}
void
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Com_BlockFullChecksum (const void *buffer, int len, unsigned char *outbuf)
{
mdfour (outbuf, (unsigned char *) buffer, len);
}