/* mdfour.c An implementation of MD4 designed for use in the samba SMB authentication protocol Copyright (C) 1997-1998 Andrew Tridgell 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 $Id: mdfour.c 2557 2007-08-01 14:55:28Z acceptthis $ */ #include /* XoXus: needed for memset call */ #ifndef _MDFOUR_H #define _MDFOUR_H #ifndef int32 #define int32 int #endif #if SIZEOF_INT > 4 #define LARGE_INT32 #endif #ifndef uint32 #define uint32 unsigned int32 #endif struct mdfour { uint32 A, B, C, D; uint32 totalN; }; static void mdfour_begin(struct mdfour *md); // old: MD4Init static void mdfour_update(struct mdfour *md, unsigned char *in, size_t n); //old: MD4Update static void mdfour_result(struct mdfour *md, unsigned char *out); // old: MD4Final static void mdfour(unsigned char *out, unsigned char *in, size_t n); #endif // _MDFOUR_H /* NOTE: This code makes no attempt to be fast! It assumes that a int is at least 32 bits long */ #define F(X,Y,Z) (((X)&(Y)) | ((~(X))&(Z))) #define G(X,Y,Z) (((X)&(Y)) | ((X)&(Z)) | ((Y)&(Z))) #define H(X,Y,Z) ((X)^(Y)^(Z)) #ifdef LARGE_INT32 #define lshift(x,s) ((((x)<<(s))&0xFFFFFFFF) | (((x)>>(32-(s)))&0xFFFFFFFF)) #else #define lshift(x,s) (((x)<<(s)) | ((x)>>(32-(s)))) #endif #define ROUND1(a,b,c,d,k,s) a = lshift(a + F(b,c,d) + X[k], s) #define ROUND2(a,b,c,d,k,s) a = lshift(a + G(b,c,d) + X[k] + 0x5A827999,s) #define ROUND3(a,b,c,d,k,s) a = lshift(a + H(b,c,d) + X[k] + 0x6ED9EBA1,s) /* this applies md4 to 64 byte chunks */ static void mdfour64(struct mdfour *m, uint32 *M) { int j; uint32 AA, BB, CC, DD; uint32 X[16]; uint32 A,B,C,D; for (j=0;j<16;j++) X[j] = M[j]; A = m->A; B = m->B; C = m->C; D = m->D; AA = A; BB = B; CC = C; DD = D; ROUND1(A,B,C,D, 0, 3); ROUND1(D,A,B,C, 1, 7); ROUND1(C,D,A,B, 2, 11); ROUND1(B,C,D,A, 3, 19); ROUND1(A,B,C,D, 4, 3); ROUND1(D,A,B,C, 5, 7); ROUND1(C,D,A,B, 6, 11); ROUND1(B,C,D,A, 7, 19); ROUND1(A,B,C,D, 8, 3); ROUND1(D,A,B,C, 9, 7); ROUND1(C,D,A,B, 10, 11); ROUND1(B,C,D,A, 11, 19); ROUND1(A,B,C,D, 12, 3); ROUND1(D,A,B,C, 13, 7); ROUND1(C,D,A,B, 14, 11); ROUND1(B,C,D,A, 15, 19); ROUND2(A,B,C,D, 0, 3); ROUND2(D,A,B,C, 4, 5); ROUND2(C,D,A,B, 8, 9); ROUND2(B,C,D,A, 12, 13); ROUND2(A,B,C,D, 1, 3); ROUND2(D,A,B,C, 5, 5); ROUND2(C,D,A,B, 9, 9); ROUND2(B,C,D,A, 13, 13); ROUND2(A,B,C,D, 2, 3); ROUND2(D,A,B,C, 6, 5); ROUND2(C,D,A,B, 10, 9); ROUND2(B,C,D,A, 14, 13); ROUND2(A,B,C,D, 3, 3); ROUND2(D,A,B,C, 7, 5); ROUND2(C,D,A,B, 11, 9); ROUND2(B,C,D,A, 15, 13); ROUND3(A,B,C,D, 0, 3); ROUND3(D,A,B,C, 8, 9); ROUND3(C,D,A,B, 4, 11); ROUND3(B,C,D,A, 12, 15); ROUND3(A,B,C,D, 2, 3); ROUND3(D,A,B,C, 10, 9); ROUND3(C,D,A,B, 6, 11); ROUND3(B,C,D,A, 14, 15); ROUND3(A,B,C,D, 1, 3); ROUND3(D,A,B,C, 9, 9); ROUND3(C,D,A,B, 5, 11); ROUND3(B,C,D,A, 13, 15); ROUND3(A,B,C,D, 3, 3); ROUND3(D,A,B,C, 11, 9); ROUND3(C,D,A,B, 7, 11); ROUND3(B,C,D,A, 15, 15); A += AA; B += BB; C += CC; D += DD; #ifdef LARGE_INT32 A &= 0xFFFFFFFF; B &= 0xFFFFFFFF; C &= 0xFFFFFFFF; D &= 0xFFFFFFFF; #endif for (j=0;j<16;j++) X[j] = 0; m->A = A; m->B = B; m->C = C; m->D = D; } static void copy64(uint32 *M, unsigned char *in) { int i; for (i=0;i<16;i++) M[i] = (in[i*4+3]<<24) | (in[i*4+2]<<16) | (in[i*4+1]<<8) | (in[i*4+0]<<0); } static void copy4(unsigned char *out,uint32 x) { out[0] = x&0xFF; out[1] = (x>>8)&0xFF; out[2] = (x>>16)&0xFF; out[3] = (x>>24)&0xFF; } static void mdfour_begin(struct mdfour *md) { md->A = 0x67452301; md->B = 0xefcdab89; md->C = 0x98badcfe; md->D = 0x10325476; md->totalN = 0; } static void mdfour_tail(struct mdfour *m, unsigned char *in, size_t n) { unsigned char buf[128]; uint32 M[16]; uint32 b; m->totalN += n; b = m->totalN * 8; memset(buf, 0, 128); if (n) memcpy(buf, in, n); buf[n] = 0x80; if (n <= 55) { copy4(buf+56, b); copy64(M, buf); mdfour64(m, M); } else { copy4(buf+120, b); copy64(M, buf); mdfour64(m, M); copy64(M, buf+64); mdfour64(m, M); } } static void mdfour_update(struct mdfour *m, unsigned char *in, size_t n) { uint32 M[16]; // if (n == 0) mdfour_tail(in, n); //Spike: This is where the bug was. while (n >= 64) { copy64(M, in); mdfour64(m, M); in += 64; n -= 64; m->totalN += 64; } mdfour_tail(m, in, n); } static void mdfour_result(struct mdfour *m, unsigned char *out) { copy4(out, m->A); copy4(out+4, m->B); copy4(out+8, m->C); copy4(out+12, m->D); } static void mdfour(unsigned char *out, unsigned char *in, size_t n) { struct mdfour md; mdfour_begin(&md); mdfour_update(&md, in, n); mdfour_result(&md, out); } /////////////////////////////////////////////////////////////// // MD4-based checksum utility functions // // Copyright (C) 2000 Jeff Teunissen // // Author: Jeff Teunissen // Date: 01 Jan 2000 unsigned Com_BlockChecksum (void *buffer, size_t length) { int digest[4]; unsigned val; mdfour ( (unsigned char *) digest, (unsigned char *) buffer, length ); val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3]; return val; } void Com_BlockFullChecksum (void *buffer, size_t len, unsigned char *outbuf) { mdfour ( outbuf, (unsigned char *) buffer, len ); }