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
|
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#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: */
|
