1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org 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 Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#include "md5.hxx"
#include <cstddef>
#include <stdio.h>
#include <rtl/strbuf.hxx>
#ifdef WNT
#define FILE_OPEN_READ "rb"
#else
#define FILE_OPEN_READ "r"
#endif
// Extended calc_md5_checksum to recognize Windows executables and libraries. To
// create the same md5 checksum for a (code/data) identical file it ignores a different
// date and header checksum. Please see crashrep/source/win32/soreport.cpp
// where the same method is also used. The crash reporter uses the MD5
// checksums to transfer them to the crash database. You have to make sure that both
// methods use the same algorithm otherwise there could be problems with stack reports.
void normalize_pe_image(sal_uInt8* buffer, size_t nBufferSize)
{
const int OFFSET_PE_OFFSET = 0x3c;
const int OFFSET_COFF_TIMEDATESTAMP = 4;
const int PE_SIGNATURE_SIZE = 4;
const int COFFHEADER_SIZE = 20;
const int OFFSET_PE_OPTIONALHEADER_CHECKSUM = 64;
// Check the header part of the file buffer
if (buffer[0] == sal_uInt8('M') && buffer[1] == sal_uInt8('Z'))
{
unsigned long PEHeaderOffset = (long)buffer[OFFSET_PE_OFFSET];
if (PEHeaderOffset < nBufferSize-4)
{
if ( buffer[PEHeaderOffset+0] == sal_uInt8('P') &&
buffer[PEHeaderOffset+1] == sal_uInt8('E') &&
buffer[PEHeaderOffset+2] == 0 &&
buffer[PEHeaderOffset+3] == 0 )
{
PEHeaderOffset += PE_SIGNATURE_SIZE;
if (PEHeaderOffset+OFFSET_COFF_TIMEDATESTAMP < nBufferSize-4)
{
// Set timedatestamp and checksum fields to a normalized
// value to enforce the same MD5 checksum for identical
// Windows executables/libraries.
buffer[PEHeaderOffset+OFFSET_COFF_TIMEDATESTAMP+0] = 0;
buffer[PEHeaderOffset+OFFSET_COFF_TIMEDATESTAMP+1] = 0;
buffer[PEHeaderOffset+OFFSET_COFF_TIMEDATESTAMP+2] = 0;
buffer[PEHeaderOffset+OFFSET_COFF_TIMEDATESTAMP+3] = 0;
}
if (PEHeaderOffset+COFFHEADER_SIZE+OFFSET_PE_OPTIONALHEADER_CHECKSUM < nBufferSize-4)
{
// Set checksum to a normalized value
buffer[PEHeaderOffset+COFFHEADER_SIZE+OFFSET_PE_OPTIONALHEADER_CHECKSUM] = 0;
buffer[PEHeaderOffset+COFFHEADER_SIZE+OFFSET_PE_OPTIONALHEADER_CHECKSUM+1] = 0;
buffer[PEHeaderOffset+COFFHEADER_SIZE+OFFSET_PE_OPTIONALHEADER_CHECKSUM+2] = 0;
buffer[PEHeaderOffset+COFFHEADER_SIZE+OFFSET_PE_OPTIONALHEADER_CHECKSUM+3] = 0;
}
}
}
}
}
rtlDigestError calc_md5_checksum(const char *filename, rtl::OString &rChecksum)
{
const size_t BUFFER_SIZE = 0x1000;
const size_t MINIMAL_SIZE = 512;
sal_uInt8 checksum[RTL_DIGEST_LENGTH_MD5];
rtlDigestError error = rtl_Digest_E_None;
rtl::OStringBuffer aChecksumBuf;
FILE *fp = fopen( filename, FILE_OPEN_READ );
if ( fp )
{
rtlDigest digest = rtl_digest_createMD5();
if ( digest )
{
size_t nBytesRead;
sal_uInt8 buffer[BUFFER_SIZE];
bool bHeader(true);
while ( rtl_Digest_E_None == error &&
0 != (nBytesRead = fread( buffer, 1, sizeof(buffer), fp )) )
{
if (bHeader)
{
bHeader = false;
if (nBytesRead >= MINIMAL_SIZE && buffer[0] == sal_uInt8('M') && buffer[1] == sal_uInt8('Z') )
normalize_pe_image(buffer, nBytesRead);
}
error = rtl_digest_updateMD5( digest, buffer, nBytesRead );
}
if ( rtl_Digest_E_None == error )
{
error = rtl_digest_getMD5( digest, checksum, sizeof(checksum) );
}
rtl_digest_destroyMD5( digest );
for ( std::size_t i = 0; i < sizeof(checksum); i++ )
{
if ( checksum[i] < 16 )
aChecksumBuf.append('0');
aChecksumBuf.append(static_cast<sal_Int32>(checksum[i]), 16);
}
}
fclose( fp );
}
else
error = rtl_Digest_E_Unknown;
rChecksum = aChecksumBuf.makeStringAndClear();
return error;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
|
