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Diffstat (limited to 'fs/cifs/md4.c')
| -rw-r--r-- | fs/cifs/md4.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/fs/cifs/md4.c b/fs/cifs/md4.c new file mode 100644 index 00000000000..46d62c9dda0 --- /dev/null +++ b/fs/cifs/md4.c @@ -0,0 +1,205 @@ +/* + 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; +} |