diff options
| -rw-r--r-- | tools/bootstrp/md5.cxx | 64 |
1 files changed, 63 insertions, 1 deletions
diff --git a/tools/bootstrp/md5.cxx b/tools/bootstrp/md5.cxx index bca89725fac2..a234f278cc9d 100644 --- a/tools/bootstrp/md5.cxx +++ b/tools/bootstrp/md5.cxx @@ -44,8 +44,62 @@ #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, ByteString &aChecksum ) { + 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; @@ -58,11 +112,19 @@ rtlDigestError calc_md5_checksum( const char *filename, ByteString &aChecksum ) if ( digest ) { size_t nBytesRead; - sal_uInt8 buffer[0x1000]; + 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 ); } |