317 lines
8.0 KiB
C
317 lines
8.0 KiB
C
/*-
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* Copyright (c) 2010, 2013 Zheng Liu <lz@freebsd.org>
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* Copyright (c) 2012, Vyacheslav Matyushin
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* The following notice applies to the code in ext2_half_md4():
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*
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* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
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*
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* License to copy and use this software is granted provided that it
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* is identified as the "RSA Data Security, Inc. MD4 Message-Digest
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* Algorithm" in all material mentioning or referencing this software
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* or this function.
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*
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* License is also granted to make and use derivative works provided
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* that such works are identified as "derived from the RSA Data
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* Security, Inc. MD4 Message-Digest Algorithm" in all material
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* mentioning or referencing the derived work.
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*
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* RSA Data Security, Inc. makes no representations concerning either
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* the merchantability of this software or the suitability of this
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* software for any particular purpose. It is provided "as is"
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* without express or implied warranty of any kind.
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*
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* These notices must be retained in any copies of any part of this
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* documentation and/or software.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/conf.h>
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#include <sys/vnode.h>
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#include <sys/stat.h>
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#include <sys/mount.h>
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#include <fs/ext2fs/htree.h>
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#include <fs/ext2fs/inode.h>
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#include <fs/ext2fs/ext2_mount.h>
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#include <fs/ext2fs/ext2_extern.h>
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/* F, G, and H are MD4 functions */
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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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/* ROTATE_LEFT rotates x left n bits */
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#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n))))
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/*
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* FF, GG, and HH are transformations for rounds 1, 2, and 3.
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* Rotation is separated from addition to prevent recomputation.
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*/
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#define FF(a, b, c, d, x, s) { \
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(a) += F ((b), (c), (d)) + (x); \
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(a) = ROTATE_LEFT ((a), (s)); \
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}
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#define GG(a, b, c, d, x, s) { \
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(a) += G ((b), (c), (d)) + (x) + (uint32_t)0x5A827999; \
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(a) = ROTATE_LEFT ((a), (s)); \
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}
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#define HH(a, b, c, d, x, s) { \
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(a) += H ((b), (c), (d)) + (x) + (uint32_t)0x6ED9EBA1; \
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(a) = ROTATE_LEFT ((a), (s)); \
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}
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/*
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* MD4 basic transformation. It transforms state based on block.
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*
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* This is a half md4 algorithm since Linux uses this algorithm for dir
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* index. This function is derived from the RSA Data Security, Inc. MD4
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* Message-Digest Algorithm and was modified as necessary.
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*
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* The return value of this function is uint32_t in Linux, but actually we don't
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* need to check this value, so in our version this function doesn't return any
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* value.
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*/
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static void
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ext2_half_md4(uint32_t hash[4], uint32_t data[8])
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{
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uint32_t a = hash[0], b = hash[1], c = hash[2], d = hash[3];
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/* Round 1 */
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FF(a, b, c, d, data[0], 3);
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FF(d, a, b, c, data[1], 7);
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FF(c, d, a, b, data[2], 11);
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FF(b, c, d, a, data[3], 19);
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FF(a, b, c, d, data[4], 3);
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FF(d, a, b, c, data[5], 7);
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FF(c, d, a, b, data[6], 11);
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FF(b, c, d, a, data[7], 19);
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/* Round 2 */
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GG(a, b, c, d, data[1], 3);
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GG(d, a, b, c, data[3], 5);
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GG(c, d, a, b, data[5], 9);
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GG(b, c, d, a, data[7], 13);
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GG(a, b, c, d, data[0], 3);
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GG(d, a, b, c, data[2], 5);
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GG(c, d, a, b, data[4], 9);
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GG(b, c, d, a, data[6], 13);
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/* Round 3 */
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HH(a, b, c, d, data[3], 3);
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HH(d, a, b, c, data[7], 9);
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HH(c, d, a, b, data[2], 11);
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HH(b, c, d, a, data[6], 15);
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HH(a, b, c, d, data[1], 3);
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HH(d, a, b, c, data[5], 9);
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HH(c, d, a, b, data[0], 11);
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HH(b, c, d, a, data[4], 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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/*
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* Tiny Encryption Algorithm.
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*/
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static void
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ext2_tea(uint32_t hash[4], uint32_t data[8])
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{
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uint32_t tea_delta = 0x9E3779B9;
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uint32_t sum;
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uint32_t x = hash[0], y = hash[1];
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int n = 16;
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int i = 1;
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while (n-- > 0) {
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sum = i * tea_delta;
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x += ((y << 4) + data[0]) ^ (y + sum) ^ ((y >> 5) + data[1]);
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y += ((x << 4) + data[2]) ^ (x + sum) ^ ((x >> 5) + data[3]);
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i++;
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}
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hash[0] += x;
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hash[1] += y;
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}
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static uint32_t
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ext2_legacy_hash(const char *name, int len, int unsigned_char)
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{
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uint32_t h0, h1 = 0x12A3FE2D, h2 = 0x37ABE8F9;
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uint32_t multi = 0x6D22F5;
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const unsigned char *uname = (const unsigned char *)name;
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const signed char *sname = (const signed char *)name;
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int val, i;
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for (i = 0; i < len; i++) {
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if (unsigned_char)
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val = (u_int)*uname++;
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else
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val = (int)*sname++;
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h0 = h2 + (h1 ^ (val * multi));
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if (h0 & 0x80000000)
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h0 -= 0x7FFFFFFF;
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h2 = h1;
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h1 = h0;
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}
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return (h1 << 1);
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}
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static void
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ext2_prep_hashbuf(const char *src, int slen, uint32_t *dst, int dlen,
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int unsigned_char)
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{
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uint32_t padding = slen | (slen << 8) | (slen << 16) | (slen << 24);
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uint32_t buf_val;
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const unsigned char *ubuf = (const unsigned char *)src;
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const signed char *sbuf = (const signed char *)src;
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int len, i;
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int buf_byte;
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if (slen > dlen)
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len = dlen;
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else
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len = slen;
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buf_val = padding;
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for (i = 0; i < len; i++) {
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if (unsigned_char)
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buf_byte = (u_int)ubuf[i];
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else
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buf_byte = (int)sbuf[i];
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if ((i % 4) == 0)
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buf_val = padding;
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buf_val <<= 8;
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buf_val += buf_byte;
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if ((i % 4) == 3) {
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*dst++ = buf_val;
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dlen -= sizeof(uint32_t);
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buf_val = padding;
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}
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}
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dlen -= sizeof(uint32_t);
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if (dlen >= 0)
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*dst++ = buf_val;
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dlen -= sizeof(uint32_t);
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while (dlen >= 0) {
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*dst++ = padding;
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dlen -= sizeof(uint32_t);
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}
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}
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int
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ext2_htree_hash(const char *name, int len,
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uint32_t *hash_seed, int hash_version,
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uint32_t *hash_major, uint32_t *hash_minor)
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{
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uint32_t hash[4];
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uint32_t data[8];
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uint32_t major = 0, minor = 0;
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int unsigned_char = 0;
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if (!name || !hash_major)
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return (-1);
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if (len < 1 || len > 255)
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goto error;
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hash[0] = 0x67452301;
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hash[1] = 0xEFCDAB89;
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hash[2] = 0x98BADCFE;
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hash[3] = 0x10325476;
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if (hash_seed)
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memcpy(hash, hash_seed, sizeof(hash));
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switch (hash_version) {
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case EXT2_HTREE_TEA_UNSIGNED:
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unsigned_char = 1;
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/* FALLTHROUGH */
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case EXT2_HTREE_TEA:
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while (len > 0) {
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ext2_prep_hashbuf(name, len, data, 16, unsigned_char);
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ext2_tea(hash, data);
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len -= 16;
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name += 16;
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}
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major = hash[0];
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minor = hash[1];
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break;
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case EXT2_HTREE_LEGACY_UNSIGNED:
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unsigned_char = 1;
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/* FALLTHROUGH */
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case EXT2_HTREE_LEGACY:
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major = ext2_legacy_hash(name, len, unsigned_char);
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break;
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case EXT2_HTREE_HALF_MD4_UNSIGNED:
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unsigned_char = 1;
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/* FALLTHROUGH */
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case EXT2_HTREE_HALF_MD4:
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while (len > 0) {
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ext2_prep_hashbuf(name, len, data, 32, unsigned_char);
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ext2_half_md4(hash, data);
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len -= 32;
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name += 32;
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}
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major = hash[1];
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minor = hash[2];
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break;
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default:
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goto error;
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}
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major &= ~1;
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if (major == (EXT2_HTREE_EOF << 1))
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major = (EXT2_HTREE_EOF - 1) << 1;
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*hash_major = major;
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if (hash_minor)
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*hash_minor = minor;
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return (0);
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error:
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*hash_major = 0;
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if (hash_minor)
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*hash_minor = 0;
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return (-1);
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}
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