smbmd4.c
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上传日期:2007-01-04
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文件大小:4k
- /*
- Unix SMB/Netbios implementation.
- Version 1.9.
- a implementation of MD4 designed for use in the SMB authentication protocol
- Copyright (C) Andrew Tridgell 1997-1998.
-
- 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 the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
- #include "smbmd4.h"
- typedef unsigned uint32;
- /* NOTE: This code makes no attempt to be fast!
- It assumes that a int is at least 32 bits long
- */
- static uint32 A, B, C, D;
- static uint32 F(uint32 X, uint32 Y, uint32 Z)
- {
- return (X&Y) | ((~X)&Z);
- }
- static uint32 G(uint32 X, uint32 Y, uint32 Z)
- {
- return (X&Y) | (X&Z) | (Y&Z);
- }
- static uint32 H(uint32 X, uint32 Y, uint32 Z)
- {
- return X^Y^Z;
- }
- static uint32 lshift(uint32 x, int s)
- {
- x &= 0xFFFFFFFF;
- return ((x<<s)&0xFFFFFFFF) | (x>>(32-s));
- }
- #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] + (uint32)0x5A827999,s)
- #define ROUND3(a,b,c,d,k,s) a = lshift(a + H(b,c,d) + X[k] + (uint32)0x6ED9EBA1,s)
- /* this applies md4 to 64 byte chunks */
- static void mdfour64(uint32 *M)
- {
- int j;
- uint32 AA, BB, CC, DD;
- uint32 X[16];
- for (j=0;j<16;j++)
- X[j] = M[j];
- 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;
-
- A &= 0xFFFFFFFF; B &= 0xFFFFFFFF;
- C &= 0xFFFFFFFF; D &= 0xFFFFFFFF;
- for (j=0;j<16;j++)
- X[j] = 0;
- }
- 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;
- }
- /* produce a md4 message digest from data of length n bytes */
- void mdfour(unsigned char *out, unsigned char *in, int n)
- {
- unsigned char buf[128];
- uint32 M[16];
- uint32 b = n * 8;
- int i;
- A = 0x67452301;
- B = 0xefcdab89;
- C = 0x98badcfe;
- D = 0x10325476;
- while (n > 64) {
- copy64(M, in);
- mdfour64(M);
- in += 64;
- n -= 64;
- }
- for (i=0;i<128;i++)
- buf[i] = 0;
- memcpy(buf, in, n);
- buf[n] = 0x80;
-
- if (n <= 55) {
- copy4(buf+56, b);
- copy64(M, buf);
- mdfour64(M);
- } else {
- copy4(buf+120, b);
- copy64(M, buf);
- mdfour64(M);
- copy64(M, buf+64);
- mdfour64(M);
- }
- for (i=0;i<128;i++)
- buf[i] = 0;
- copy64(M, buf);
- copy4(out, A);
- copy4(out+4, B);
- copy4(out+8, C);
- copy4(out+12, D);
- A = B = C = D = 0;
- }