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* Yet another MD4 implementation
* Removed Com_BlockChecksumkey and replaced its functionality in the calling function
This commit is contained in:
Tim Angus
parent
0856744622
commit
6a396f761f
3 changed files with 188 additions and 199 deletions
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@ -1739,7 +1739,8 @@ static pack_t *FS_LoadZipFile( char *zipfile, const char *basename )
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buildBuffer = Z_Malloc( (gi.number_entry * sizeof( fileInPack_t )) + len );
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namePtr = ((char *) buildBuffer) + gi.number_entry * sizeof( fileInPack_t );
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fs_headerLongs = Z_Malloc( gi.number_entry * sizeof(int) );
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fs_headerLongs = Z_Malloc( ( gi.number_entry + 1 ) * sizeof(int) );
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fs_headerLongs[ fs_numHeaderLongs++ ] = LittleLong( fs_checksumFeed );
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// get the hash table size from the number of files in the zip
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// because lots of custom pk3 files have less than 32 or 64 files
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@ -1790,8 +1791,8 @@ static pack_t *FS_LoadZipFile( char *zipfile, const char *basename )
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unzGoToNextFile(uf);
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}
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pack->checksum = Com_BlockChecksum( fs_headerLongs, 4 * fs_numHeaderLongs );
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pack->pure_checksum = Com_BlockChecksumKey( fs_headerLongs, 4 * fs_numHeaderLongs, LittleLong(fs_checksumFeed) );
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pack->checksum = Com_BlockChecksum( &fs_headerLongs[ 1 ], 4 * ( fs_numHeaderLongs - 1 ) );
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pack->pure_checksum = Com_BlockChecksum( fs_headerLongs, 4 * fs_numHeaderLongs );
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pack->checksum = LittleLong( pack->checksum );
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pack->pure_checksum = LittleLong( pack->pure_checksum );
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@ -1,238 +1,227 @@
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/*
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* Cryptographic API.
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*
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* MD4 Message Digest Algorithm (RFC1320).
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*
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* Implementation derived from Andrew Tridgell and Steve French's
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* CIFS MD4 implementation, and the cryptoapi implementation
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* originally based on the public domain implementation written
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* by Colin Plumb in 1993.
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*
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* Copyright (c) Andrew Tridgell 1997-1998.
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* Modified by Steve French (sfrench@us.ibm.com) 2002
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* Copyright (c) Cryptoapi developers.
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* Copyright (c) 2002 David S. Miller (davem@redhat.com)
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* Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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*/
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/*
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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: mdfour.c,v 1.1 2002/08/23 22:03:27 abster Exp $
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*/
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#include "q_shared.h"
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#include "qcommon.h"
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typedef unsigned int u32;
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#define MD4_DIGEST_SIZE 16
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#define MD4_HMAC_BLOCK_SIZE 64
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#define MD4_BLOCK_WORDS 16
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#define MD4_HASH_WORDS 4
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#ifndef int32
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#define int32 int
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#endif
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struct md4_ctx {
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u32 hash[MD4_HASH_WORDS];
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u32 block[MD4_BLOCK_WORDS];
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u32 byte_count;
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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 ID_INLINE u32 lshift(u32 x, unsigned int s)
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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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static struct mdfour *m;
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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(uint32 *M)
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{
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x &= 0xFFFFFFFF;
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return ((x << s) & 0xFFFFFFFF) | (x >> (32 - s));
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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 ID_INLINE u32 F(u32 x, u32 y, u32 z)
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static void copy64(uint32 *M, byte *in)
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{
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return (x & y) | ((~x) & z);
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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 ID_INLINE u32 G(u32 x, u32 y, u32 z)
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static void copy4(byte *out,uint32 x)
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{
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return (x & y) | (x & z) | (y & z);
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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 ID_INLINE u32 H(u32 x, u32 y, u32 z)
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void mdfour_begin(struct mdfour *md)
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{
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return x ^ y ^ z;
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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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#define ROUND1(a,b,c,d,k,s) (a = lshift(a + F(b,c,d) + k, s))
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#define ROUND2(a,b,c,d,k,s) (a = lshift(a + G(b,c,d) + k + (u32)0x5A827999,s))
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#define ROUND3(a,b,c,d,k,s) (a = lshift(a + H(b,c,d) + k + (u32)0x6ED9EBA1,s))
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static ID_INLINE void LittleLongArray(u32 *buf, unsigned int words)
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static void mdfour_tail(byte *in, int n)
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{
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while (words--) {
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*buf = LittleLong(*buf);
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buf++;
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byte 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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Com_Memset(buf, 0, 128);
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if (n) Com_Memcpy(buf, in, n);
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buf[n] = 0x80;
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if (n <= 55) {
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copy4(buf+56, b);
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copy64(M, buf);
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mdfour64(M);
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} else {
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copy4(buf+120, b);
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copy64(M, buf);
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mdfour64(M);
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copy64(M, buf+64);
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mdfour64(M);
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}
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}
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static void md4_transform(u32 *hash, u32 const *in)
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static void mdfour_update(struct mdfour *md, byte *in, int n)
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{
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u32 a, b, c, d;
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uint32 M[16];
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a = hash[0];
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b = hash[1];
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c = hash[2];
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d = hash[3];
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if (n == 0) mdfour_tail(in, n);
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ROUND1(a, b, c, d, in[0], 3);
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ROUND1(d, a, b, c, in[1], 7);
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ROUND1(c, d, a, b, in[2], 11);
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ROUND1(b, c, d, a, in[3], 19);
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ROUND1(a, b, c, d, in[4], 3);
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ROUND1(d, a, b, c, in[5], 7);
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ROUND1(c, d, a, b, in[6], 11);
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ROUND1(b, c, d, a, in[7], 19);
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ROUND1(a, b, c, d, in[8], 3);
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ROUND1(d, a, b, c, in[9], 7);
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ROUND1(c, d, a, b, in[10], 11);
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ROUND1(b, c, d, a, in[11], 19);
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ROUND1(a, b, c, d, in[12], 3);
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ROUND1(d, a, b, c, in[13], 7);
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ROUND1(c, d, a, b, in[14], 11);
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ROUND1(b, c, d, a, in[15], 19);
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m = md;
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ROUND2(a, b, c, d,in[ 0], 3);
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ROUND2(d, a, b, c, in[4], 5);
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ROUND2(c, d, a, b, in[8], 9);
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ROUND2(b, c, d, a, in[12], 13);
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ROUND2(a, b, c, d, in[1], 3);
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ROUND2(d, a, b, c, in[5], 5);
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ROUND2(c, d, a, b, in[9], 9);
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ROUND2(b, c, d, a, in[13], 13);
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ROUND2(a, b, c, d, in[2], 3);
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ROUND2(d, a, b, c, in[6], 5);
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ROUND2(c, d, a, b, in[10], 9);
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ROUND2(b, c, d, a, in[14], 13);
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ROUND2(a, b, c, d, in[3], 3);
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ROUND2(d, a, b, c, in[7], 5);
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ROUND2(c, d, a, b, in[11], 9);
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ROUND2(b, c, d, a, in[15], 13);
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ROUND3(a, b, c, d,in[ 0], 3);
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ROUND3(d, a, b, c, in[8], 9);
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ROUND3(c, d, a, b, in[4], 11);
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ROUND3(b, c, d, a, in[12], 15);
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ROUND3(a, b, c, d, in[2], 3);
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ROUND3(d, a, b, c, in[10], 9);
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ROUND3(c, d, a, b, in[6], 11);
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ROUND3(b, c, d, a, in[14], 15);
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ROUND3(a, b, c, d, in[1], 3);
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ROUND3(d, a, b, c, in[9], 9);
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ROUND3(c, d, a, b, in[5], 11);
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ROUND3(b, c, d, a, in[13], 15);
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ROUND3(a, b, c, d, in[3], 3);
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ROUND3(d, a, b, c, in[11], 9);
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ROUND3(c, d, a, b, in[7], 11);
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ROUND3(b, c, d, a, in[15], 15);
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hash[0] += a;
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hash[1] += b;
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hash[2] += c;
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hash[3] += d;
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}
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static ID_INLINE void md4_transform_helper(struct md4_ctx *ctx)
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{
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LittleLongArray(ctx->block, sizeof(ctx->block) / 4);
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md4_transform(ctx->hash, ctx->block);
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}
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static void md4_init(void *ctx)
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{
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struct md4_ctx *mctx = ctx;
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mctx->hash[0] = 0x67452301;
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mctx->hash[1] = 0xefcdab89;
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mctx->hash[2] = 0x98badcfe;
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mctx->hash[3] = 0x10325476;
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mctx->byte_count = 0;
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}
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static void md4_update(void *ctx, const byte *data, unsigned int len)
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{
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struct md4_ctx *mctx = ctx;
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const u32 avail = sizeof(mctx->block) - (mctx->byte_count & 0x3f);
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mctx->byte_count += len;
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if (avail > len) {
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Com_Memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
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data, len);
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return;
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while (n >= 64) {
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copy64(M, in);
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mdfour64(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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Com_Memcpy((char *)mctx->block + (sizeof(mctx->block) - avail),
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data, avail);
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md4_transform_helper(mctx);
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data += avail;
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len -= avail;
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while (len >= sizeof(mctx->block)) {
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Com_Memcpy(mctx->block, data, sizeof(mctx->block));
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md4_transform_helper(mctx);
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data += sizeof(mctx->block);
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len -= sizeof(mctx->block);
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}
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Com_Memcpy(mctx->block, data, len);
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mdfour_tail(in, n);
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}
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static void md4_final(void *ctx, byte *out)
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static void mdfour_result(struct mdfour *md, byte *out)
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{
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struct md4_ctx *mctx = ctx;
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const unsigned int offset = mctx->byte_count & 0x3f;
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char *p = (char *)mctx->block + offset;
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int padding = 56 - (offset + 1);
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m = md;
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*p++ = 0x80;
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if (padding < 0) {
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Com_Memset(p, 0x00, padding + 8);
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md4_transform_helper(mctx);
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p = (char *)mctx->block;
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padding = 56;
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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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Com_Memset(p, 0, padding);
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mctx->block[14] = mctx->byte_count << 3;
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mctx->block[15] = mctx->byte_count >> 29;
|
||||
LittleLongArray(mctx->block, (sizeof(mctx->block) - 8) / 4);
|
||||
md4_transform(mctx->hash, mctx->block);
|
||||
Com_Memcpy(out, mctx->hash, sizeof(mctx->hash));
|
||||
Com_Memset(mctx, 0, sizeof(*mctx));
|
||||
static void mdfour(byte *out, byte *in, int n)
|
||||
{
|
||||
struct mdfour md;
|
||||
mdfour_begin(&md);
|
||||
mdfour_update(&md, in, n);
|
||||
mdfour_result(&md, out);
|
||||
}
|
||||
|
||||
//===================================================================
|
||||
|
||||
unsigned Com_BlockChecksum( const void *buffer, int length )
|
||||
unsigned Com_BlockChecksum (const void *buffer, int length)
|
||||
{
|
||||
int digest[4];
|
||||
unsigned val;
|
||||
struct md4_ctx ctx;
|
||||
int digest[4];
|
||||
unsigned val;
|
||||
|
||||
md4_init( &ctx );
|
||||
md4_update( &ctx, (byte *)buffer, length );
|
||||
md4_final( &ctx, (byte *)digest );
|
||||
|
||||
val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
|
||||
|
||||
return val;
|
||||
}
|
||||
|
||||
unsigned Com_BlockChecksumKey( const void *buffer, int length, int key )
|
||||
{
|
||||
int digest[4];
|
||||
unsigned val;
|
||||
struct md4_ctx ctx;
|
||||
|
||||
md4_init( &ctx );
|
||||
md4_update( &ctx, (byte *)&key, 4 );
|
||||
md4_update( &ctx, (byte *)buffer, length );
|
||||
md4_final( &ctx, (byte *)digest );
|
||||
mdfour( (byte *)digest, (byte *)buffer, length );
|
||||
|
||||
val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
|
||||
|
||||
|
|
|
|||
|
|
@ -726,7 +726,6 @@ void Com_Quit_f( void );
|
|||
int Com_EventLoop( void );
|
||||
int Com_Milliseconds( void ); // will be journaled properly
|
||||
unsigned Com_BlockChecksum( const void *buffer, int length );
|
||||
unsigned Com_BlockChecksumKey ( const void *buffer, int length, int key);
|
||||
int Com_HashKey(char *string, int maxlen);
|
||||
int Com_Filter(char *filter, char *name, int casesensitive);
|
||||
int Com_FilterPath(char *filter, char *name, int casesensitive);
|
||||
|
|
|
|||
Loading…
Reference in a new issue