/* 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. Modified by Steve French (sfrench@us.ibm.com) 2002-2003 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 <linux/module.h> #include <linux/fs.h> #include "cifsencrypt.h" /* NOTE: This code makes no attempt to be fast! */ static __u32 F(__u32 X, __u32 Y, __u32 Z) { return (X & Y) | ((~X) & Z); } static __u32 G(__u32 X, __u32 Y, __u32 Z) { return (X & Y) | (X & Z) | (Y & Z); } static __u32 H(__u32 X, __u32 Y, __u32 Z) { return X ^ Y ^ Z; } static __u32 lshift(__u32 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] + (__u32)0x5A827999,s) #define ROUND3(a,b,c,d,k,s) (*a) = lshift((*a) + H(*b,*c,*d) + X[k] + (__u32)0x6ED9EBA1,s) /* this applies md4 to 64 byte chunks */ static void mdfour64(__u32 * M, __u32 * A, __u32 *B, __u32 * C, __u32 *D) { int j; __u32 AA, BB, CC, DD; __u32 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(__u32 * 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, __u32 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]; __u32 M[16]; __u32 b = n * 8; int i; __u32 A = 0x67452301; __u32 B = 0xefcdab89; __u32 C = 0x98badcfe; __u32 D = 0x10325476; while (n > 64) { copy64(M, in); mdfour64(M, &A, &B, &C, &D); 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, &A, &B, &C, &D); } else { copy4(buf + 120, b); copy64(M, buf); mdfour64(M, &A, &B, &C, &D); copy64(M, buf + 64); mdfour64(M, &A, &B, &C, &D); } 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; }