2 * Copyright (c) 2016 Kai Wang
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 ELFTC_VCSID("$Id: pe_rich.c 3312 2016-01-10 09:23:51Z kaiwang27 $");
35 pe_rich_header(PE *pe)
43 if (pe->pe_rh == NULL && pe->pe_stub_ex > 0 &&
44 (pe->pe_flags & LIBPE_F_LOAD_DOS_STUB) == 0) {
45 assert((pe->pe_flags & LIBPE_F_SPECIAL_FILE) == 0);
46 (void) libpe_read_msdos_stub(pe);
49 if (pe->pe_rh == NULL) {
58 rol32(uint32_t n, int c)
63 return ((n << c) | (n >> (0x20 - c)));
67 pe_rich_header_validate(PE *pe)
74 if (pe_rich_header(pe) == NULL)
77 assert(pe->pe_rh_start != NULL);
80 * Initial value of the checksum is the offset to the begin of
83 cksum = pe->pe_rh_start - pe->pe_stub;
86 * Add the bytes before the Rich header to the checksum, rotated
89 for (p = pe->pe_stub; p < pe->pe_rh_start; p++) {
91 off = p - pe->pe_stub;
92 if (off >= 0x3c && off < 0x40)
94 cksum += rol32((unsigned char) *p, off);
97 /* Add each compid rotated left by its count to the checksum. */
99 for (i = 0; (uint32_t) i < rh->rh_total; i++)
100 cksum += rol32(rh->rh_compid[i], rh->rh_cnt[i]);
102 /* Validate the checksum with the XOR mask stored after "Rich". */
103 if (cksum == rh->rh_xor)