1215870ddd
git-svn-id: svn://10.65.10.50/branches/R_10_00@22976 c028cbd2-c16b-5b4b-a496-9718f37d4682
537 lines
21 KiB
C++
537 lines
21 KiB
C++
/*****************************************************************************************
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*** MD5Checksum.cpp: implementation of the MD5Checksum class.
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*** Developed by Langfine Ltd.
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*** Released to the public domain 12/Nov/2001.
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*** Please visit our website www.langfine.com
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*** Any modifications must be clearly commented to distinguish them from Langfine's
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*** original source code. Please advise Langfine of useful modifications so that we
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*** can make them generally available.
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*****************************************************************************************/
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/****************************************************************************************
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This software is derived from the RSA Data Security, Inc. MD5 Message-Digest Algorithm.
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Incorporation of this statement is a condition of use; please see the RSA
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Data Security Inc copyright notice below:-
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Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All
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rights reserved.
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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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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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Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
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rights reserved.
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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. MD5 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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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. MD5 Message-Digest Algorithm" in all material
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mentioning or referencing the derived work.
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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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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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/****************************************************************************************
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This implementation of the RSA MD5 Algorithm was written by Langfine Ltd
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(www.langfine.com).
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Langfine Ltd 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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In addition to the above, Langfine make no warrant or assurances regarding the
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accuracy of this implementation of the MD5 checksum algorithm nor any assurances regarding
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its suitability for any purposes.
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This implementation may be used freely provided that Langfine is credited
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in a copyright or similar notices (eg, RSA MD5 Algorithm implemented by Langfine
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Ltd.) and provided that the RSA Data Security notices are complied with.
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*/
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#include "wxinc.h"
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#include "MD5Checksum.h"
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#include "MD5ChecksumDefines.h"
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#include <wx/file.h>
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#include "wx/filename.h"
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::GetMD5
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DETAILS: static, public
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DESCRIPTION: Gets the MD5 checksum for a specified file
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RETURNS: wxString : the hexadecimal MD5 checksum for the specified file
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ARGUMENTS: wxString& strFilePath : the full pathname of the specified file
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NOTES: Provides an interface to the wxMD5Checksum class. 'strFilePath' name should
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hold the full pathname of the file, eg C:\My Documents\Arcticle.txt.
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NB. If any problems occur with opening or reading this file, a CFileException
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will be thrown; callers of this function should be ready to catch this
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exception.
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*****************************************************************************************/
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wxString wxMD5Checksum::GetMD5(const wxString& strFilePath)
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{
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if(!wxFileName::FileExists(strFilePath))
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return wxEmptyString;
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//open the file as a binary file in readonly mode, denying write access
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wxFile File(strFilePath, wxFile::read);
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//the file has been successfully opened, so now get and return its checksum
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return GetMD5(File);
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}
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::GetMD5
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DETAILS: static, public
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DESCRIPTION: Gets the MD5 checksum for a specified file
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RETURNS: wxString : the hexadecimal MD5 checksum for the specified file
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ARGUMENTS: wxFile& File : the specified file
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NOTES: Provides an interface to the wxMD5Checksum class. 'File' should be open in
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binary readonly mode before calling this function.
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NB. Callers of this function should be ready to catch any CFileException
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thrown by the wxFile functions
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*****************************************************************************************/
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wxString wxMD5Checksum::GetMD5(wxFile& File)
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{
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wxMD5Checksum MD5Checksum; //checksum object
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int nLength = 0; //number of bytes read from the file
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const int nBufferSize = 1024; //checksum the file in blocks of 1024 bytes
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unsigned char Buffer[nBufferSize]; //buffer for data read from the file
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//checksum the file in blocks of 1024 bytes
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while ((nLength = File.Read( Buffer, nBufferSize )) > 0 )
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{
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MD5Checksum.Update( Buffer, nLength );
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}
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//finalise the checksum and return it
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return MD5Checksum.Final();
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}
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::GetMD5
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DETAILS: static, public
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DESCRIPTION: Gets the MD5 checksum for data in a unsigned char array
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RETURNS: wxString : the hexadecimal MD5 checksum for the specified data
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ARGUMENTS: unsigned char* pBuf : pointer to the unsigned char array
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unsigned int nLength : number of BYTEs of data to be checksumed
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NOTES: Provides an interface to the wxMD5Checksum class. Any data that can
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be cast to a unsigned char array of known length can be checksummed by this
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function. Typically, wxString and char arrays will be checksumed,
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although this function can be used to check the integrity of any unsigned char array.
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A buffer of zero length can be checksummed; all buffers of zero length
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will return the same checksum.
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*****************************************************************************************/
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wxString wxMD5Checksum::GetMD5(unsigned char* pBuf, unsigned int nLength)
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{
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//calculate and return the checksum
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wxMD5Checksum MD5Checksum;
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MD5Checksum.Update( pBuf, nLength );
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return MD5Checksum.Final();
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}
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::RotateLeft
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DETAILS: private
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DESCRIPTION: Rotates the bits in a 32 bit unsigned long left by a specified amount
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RETURNS: The rotated unsigned long
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ARGUMENTS: unsigned long x : the value to be rotated
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int n : the number of bits to rotate by
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*****************************************************************************************/
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unsigned long wxMD5Checksum::RotateLeft(unsigned long x, int n)
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{
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//check that unsigned long is 4 bytes long - true in Visual C++ 6 and 32 bit Windows
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wxASSERT( sizeof(x) == 4 );
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//rotate and return x
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return (x << n) | (x >> (32-n));
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}
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::FF
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DETAILS: protected
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DESCRIPTION: Implementation of basic MD5 transformation algorithm
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RETURNS: none
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ARGUMENTS: unsigned long &A, B, C, D : Current (partial) checksum
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unsigned long X : Input data
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unsigned long S : MD5_SXX Transformation constant
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unsigned long T : MD5_TXX Transformation constant
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NOTES: None
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*****************************************************************************************/
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void wxMD5Checksum::FF( unsigned long& A, unsigned long B, unsigned long C, unsigned long D, unsigned long X, unsigned long S, unsigned long T)
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{
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unsigned long F = (B & C) | (~B & D);
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A += F + X + T;
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A = RotateLeft(A, S);
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A += B;
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}
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::GG
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DETAILS: protected
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DESCRIPTION: Implementation of basic MD5 transformation algorithm
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RETURNS: none
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ARGUMENTS: unsigned long &A, B, C, D : Current (partial) checksum
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unsigned long X : Input data
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unsigned long S : MD5_SXX Transformation constant
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unsigned long T : MD5_TXX Transformation constant
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NOTES: None
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*****************************************************************************************/
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void wxMD5Checksum::GG( unsigned long& A, unsigned long B, unsigned long C, unsigned long D, unsigned long X, unsigned long S, unsigned long T)
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{
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unsigned long G = (B & D) | (C & ~D);
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A += G + X + T;
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A = RotateLeft(A, S);
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A += B;
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}
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::HH
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DETAILS: protected
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DESCRIPTION: Implementation of basic MD5 transformation algorithm
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RETURNS: none
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ARGUMENTS: unsigned long &A, B, C, D : Current (partial) checksum
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unsigned long X : Input data
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unsigned long S : MD5_SXX Transformation constant
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unsigned long T : MD5_TXX Transformation constant
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NOTES: None
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*****************************************************************************************/
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void wxMD5Checksum::HH( unsigned long& A, unsigned long B, unsigned long C, unsigned long D, unsigned long X, unsigned long S, unsigned long T)
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{
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unsigned long H = (B ^ C ^ D);
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A += H + X + T;
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A = RotateLeft(A, S);
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A += B;
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}
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::II
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DETAILS: protected
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DESCRIPTION: Implementation of basic MD5 transformation algorithm
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RETURNS: none
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ARGUMENTS: unsigned long &A, B, C, D : Current (partial) checksum
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unsigned long X : Input data
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unsigned long S : MD5_SXX Transformation constant
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unsigned long T : MD5_TXX Transformation constant
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NOTES: None
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*****************************************************************************************/
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void wxMD5Checksum::II( unsigned long& A, unsigned long B, unsigned long C, unsigned long D, unsigned long X, unsigned long S, unsigned long T)
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{
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unsigned long I = (C ^ (B | ~D));
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A += I + X + T;
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A = RotateLeft(A, S);
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A += B;
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}
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::ByteToDWord
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DETAILS: private
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DESCRIPTION: Transfers the data in an 8 bit array to a 32 bit array
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RETURNS: void
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ARGUMENTS: unsigned long* Output : the 32 bit (unsigned long) destination array
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unsigned char* Input : the 8 bit (unsigned char) source array
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unsigned int nLength : the number of 8 bit data items in the source array
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NOTES: Four BYTES from the input array are transferred to each unsigned long entry
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of the output array. The first unsigned char is transferred to the bits (0-7)
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of the output unsigned long, the second unsigned char to bits 8-15 etc.
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The algorithm assumes that the input array is a multiple of 4 bytes long
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so that there is a perfect fit into the array of 32 bit words.
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*****************************************************************************************/
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void wxMD5Checksum::ByteToDWord(unsigned long* Output, unsigned char* Input, unsigned int nLength)
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{
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//entry invariants
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wxASSERT( nLength % 4 == 0 );
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//initialisations
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unsigned int i=0; //index to Output array
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unsigned int j=0; //index to Input array
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//transfer the data by shifting and copying
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for ( ; j < nLength; i++, j += 4)
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{
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Output[i] = (unsigned long)Input[j] |
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(unsigned long)Input[j+1] << 8 |
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(unsigned long)Input[j+2] << 16 |
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(unsigned long)Input[j+3] << 24;
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}
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}
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::Transform
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DETAILS: protected
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DESCRIPTION: MD5 basic transformation algorithm; transforms 'm_lMD5'
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RETURNS: void
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ARGUMENTS: unsigned char Block[64]
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NOTES: An MD5 checksum is calculated by four rounds of 'Transformation'.
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The MD5 checksum currently held in m_lMD5 is merged by the
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transformation process with data passed in 'Block'.
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*****************************************************************************************/
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void wxMD5Checksum::Transform(unsigned char Block[64])
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{
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//initialise local data with current checksum
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unsigned long a = m_lMD5[0];
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unsigned long b = m_lMD5[1];
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unsigned long c = m_lMD5[2];
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unsigned long d = m_lMD5[3];
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//copy BYTES from input 'Block' to an array of ULONGS 'X'
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unsigned long X[16];
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ByteToDWord( X, Block, 64 );
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//Perform Round 1 of the transformation
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FF (a, b, c, d, X[ 0], MD5_S11, MD5_T01);
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FF (d, a, b, c, X[ 1], MD5_S12, MD5_T02);
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FF (c, d, a, b, X[ 2], MD5_S13, MD5_T03);
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FF (b, c, d, a, X[ 3], MD5_S14, MD5_T04);
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FF (a, b, c, d, X[ 4], MD5_S11, MD5_T05);
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FF (d, a, b, c, X[ 5], MD5_S12, MD5_T06);
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FF (c, d, a, b, X[ 6], MD5_S13, MD5_T07);
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FF (b, c, d, a, X[ 7], MD5_S14, MD5_T08);
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FF (a, b, c, d, X[ 8], MD5_S11, MD5_T09);
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FF (d, a, b, c, X[ 9], MD5_S12, MD5_T10);
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FF (c, d, a, b, X[10], MD5_S13, MD5_T11);
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FF (b, c, d, a, X[11], MD5_S14, MD5_T12);
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FF (a, b, c, d, X[12], MD5_S11, MD5_T13);
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FF (d, a, b, c, X[13], MD5_S12, MD5_T14);
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FF (c, d, a, b, X[14], MD5_S13, MD5_T15);
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FF (b, c, d, a, X[15], MD5_S14, MD5_T16);
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//Perform Round 2 of the transformation
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GG (a, b, c, d, X[ 1], MD5_S21, MD5_T17);
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GG (d, a, b, c, X[ 6], MD5_S22, MD5_T18);
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GG (c, d, a, b, X[11], MD5_S23, MD5_T19);
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GG (b, c, d, a, X[ 0], MD5_S24, MD5_T20);
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GG (a, b, c, d, X[ 5], MD5_S21, MD5_T21);
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GG (d, a, b, c, X[10], MD5_S22, MD5_T22);
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GG (c, d, a, b, X[15], MD5_S23, MD5_T23);
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GG (b, c, d, a, X[ 4], MD5_S24, MD5_T24);
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GG (a, b, c, d, X[ 9], MD5_S21, MD5_T25);
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GG (d, a, b, c, X[14], MD5_S22, MD5_T26);
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GG (c, d, a, b, X[ 3], MD5_S23, MD5_T27);
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GG (b, c, d, a, X[ 8], MD5_S24, MD5_T28);
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GG (a, b, c, d, X[13], MD5_S21, MD5_T29);
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GG (d, a, b, c, X[ 2], MD5_S22, MD5_T30);
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GG (c, d, a, b, X[ 7], MD5_S23, MD5_T31);
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GG (b, c, d, a, X[12], MD5_S24, MD5_T32);
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//Perform Round 3 of the transformation
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HH (a, b, c, d, X[ 5], MD5_S31, MD5_T33);
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HH (d, a, b, c, X[ 8], MD5_S32, MD5_T34);
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HH (c, d, a, b, X[11], MD5_S33, MD5_T35);
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HH (b, c, d, a, X[14], MD5_S34, MD5_T36);
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HH (a, b, c, d, X[ 1], MD5_S31, MD5_T37);
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HH (d, a, b, c, X[ 4], MD5_S32, MD5_T38);
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HH (c, d, a, b, X[ 7], MD5_S33, MD5_T39);
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HH (b, c, d, a, X[10], MD5_S34, MD5_T40);
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HH (a, b, c, d, X[13], MD5_S31, MD5_T41);
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HH (d, a, b, c, X[ 0], MD5_S32, MD5_T42);
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HH (c, d, a, b, X[ 3], MD5_S33, MD5_T43);
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HH (b, c, d, a, X[ 6], MD5_S34, MD5_T44);
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HH (a, b, c, d, X[ 9], MD5_S31, MD5_T45);
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HH (d, a, b, c, X[12], MD5_S32, MD5_T46);
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HH (c, d, a, b, X[15], MD5_S33, MD5_T47);
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HH (b, c, d, a, X[ 2], MD5_S34, MD5_T48);
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//Perform Round 4 of the transformation
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II (a, b, c, d, X[ 0], MD5_S41, MD5_T49);
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II (d, a, b, c, X[ 7], MD5_S42, MD5_T50);
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II (c, d, a, b, X[14], MD5_S43, MD5_T51);
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II (b, c, d, a, X[ 5], MD5_S44, MD5_T52);
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II (a, b, c, d, X[12], MD5_S41, MD5_T53);
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II (d, a, b, c, X[ 3], MD5_S42, MD5_T54);
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II (c, d, a, b, X[10], MD5_S43, MD5_T55);
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II (b, c, d, a, X[ 1], MD5_S44, MD5_T56);
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II (a, b, c, d, X[ 8], MD5_S41, MD5_T57);
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II (d, a, b, c, X[15], MD5_S42, MD5_T58);
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II (c, d, a, b, X[ 6], MD5_S43, MD5_T59);
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II (b, c, d, a, X[13], MD5_S44, MD5_T60);
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II (a, b, c, d, X[ 4], MD5_S41, MD5_T61);
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II (d, a, b, c, X[11], MD5_S42, MD5_T62);
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II (c, d, a, b, X[ 2], MD5_S43, MD5_T63);
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II (b, c, d, a, X[ 9], MD5_S44, MD5_T64);
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//add the transformed values to the current checksum
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m_lMD5[0] += a;
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m_lMD5[1] += b;
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m_lMD5[2] += c;
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m_lMD5[3] += d;
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}
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/*****************************************************************************************
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CONSTRUCTOR: wxMD5Checksum
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DESCRIPTION: Initialises member data
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ARGUMENTS: None
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NOTES: None
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*****************************************************************************************/
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wxMD5Checksum::wxMD5Checksum()
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{
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// zero members
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memset( m_lpszBuffer, 0, 64 );
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m_nCount[0] = m_nCount[1] = 0;
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// Load magic state initialization constants
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m_lMD5[0] = MD5_INIT_STATE_0;
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m_lMD5[1] = MD5_INIT_STATE_1;
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m_lMD5[2] = MD5_INIT_STATE_2;
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m_lMD5[3] = MD5_INIT_STATE_3;
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}
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::DWordToByte
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DETAILS: private
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DESCRIPTION: Transfers the data in an 32 bit array to a 8 bit array
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RETURNS: void
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ARGUMENTS: unsigned char* Output : the 8 bit destination array
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unsigned long* Input : the 32 bit source array
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unsigned int nLength : the number of 8 bit data items in the source array
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NOTES: One unsigned long from the input array is transferred into four BYTES
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in the output array. The first (0-7) bits of the first unsigned long are
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transferred to the first output unsigned char, bits bits 8-15 are transferred from
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the second unsigned char etc.
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The algorithm assumes that the output array is a multiple of 4 bytes long
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so that there is a perfect fit of 8 bit BYTES into the 32 bit DWORDs.
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*****************************************************************************************/
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void wxMD5Checksum::DWordToByte(unsigned char* Output, unsigned long* Input, unsigned int nLength )
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{
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//entry invariants
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wxASSERT( nLength % 4 == 0 );
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//transfer the data by shifting and copying
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unsigned int i = 0;
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unsigned int j = 0;
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for ( ; j < nLength; i++, j += 4)
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{
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Output[j] = (UCHAR)(Input[i] & 0xff);
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Output[j+1] = (UCHAR)((Input[i] >> 8) & 0xff);
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Output[j+2] = (UCHAR)((Input[i] >> 16) & 0xff);
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Output[j+3] = (UCHAR)((Input[i] >> 24) & 0xff);
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}
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}
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/*****************************************************************************************
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FUNCTION: wxMD5Checksum::Final
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DETAILS: protected
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DESCRIPTION: Implementation of main MD5 checksum algorithm; ends the checksum calculation.
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RETURNS: wxString : the final hexadecimal MD5 checksum result
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ARGUMENTS: None
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NOTES: Performs the final MD5 checksum calculation ('Update' does most of the work,
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this function just finishes the calculation.)
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*****************************************************************************************/
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wxString wxMD5Checksum::Final()
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{
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//Save number of bits
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unsigned char Bits[8];
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DWordToByte( Bits, m_nCount, 8 );
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|
|
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//Pad out to 56 mod 64.
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unsigned int nIndex = (unsigned int)((m_nCount[0] >> 3) & 0x3f);
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unsigned int nPadLen = (nIndex < 56) ? (56 - nIndex) : (120 - nIndex);
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Update( PADDING, nPadLen );
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|
|
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//Append length (before padding)
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|
Update( Bits, 8 );
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|
|
|
//Store final state in 'lpszMD5'
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|
const int nMD5Size = 16;
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|
unsigned char lpszMD5[ nMD5Size ];
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DWordToByte( lpszMD5, m_lMD5, nMD5Size );
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|
|
|
//Convert the hexadecimal checksum to a wxString
|
|
wxString strMD5;
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for ( int i=0; i < nMD5Size; i++)
|
|
{
|
|
wxString Str;
|
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if (lpszMD5[i] == 0) {
|
|
Str = wxT("00");
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|
}
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else if (lpszMD5[i] <= 15) {
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Str.Printf(wxT("0%x"),lpszMD5[i]);
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|
}
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|
else {
|
|
Str.Printf(wxT("%x"),lpszMD5[i]);
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|
}
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|
|
|
wxASSERT( Str.Length() == 2 );
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|
strMD5 += Str;
|
|
}
|
|
wxASSERT( strMD5.Length() == 32 );
|
|
return strMD5;
|
|
}
|
|
|
|
|
|
/*****************************************************************************************
|
|
FUNCTION: wxMD5Checksum::Update
|
|
DETAILS: protected
|
|
DESCRIPTION: Implementation of main MD5 checksum algorithm
|
|
RETURNS: void
|
|
ARGUMENTS: unsigned char* Input : input block
|
|
unsigned int nInputLen : length of input block
|
|
NOTES: Computes the partial MD5 checksum for 'nInputLen' bytes of data in 'Input'
|
|
*****************************************************************************************/
|
|
void wxMD5Checksum::Update( unsigned char* Input, unsigned long nInputLen )
|
|
{
|
|
//Compute number of bytes mod 64
|
|
unsigned int nIndex = (unsigned int)((m_nCount[0] >> 3) & 0x3F);
|
|
|
|
//Update number of bits
|
|
if ( ( m_nCount[0] += nInputLen << 3 ) < ( nInputLen << 3) )
|
|
{
|
|
m_nCount[1]++;
|
|
}
|
|
m_nCount[1] += (nInputLen >> 29);
|
|
|
|
//Transform as many times as possible.
|
|
unsigned int i=0;
|
|
unsigned int nPartLen = 64 - nIndex;
|
|
if (nInputLen >= nPartLen)
|
|
{
|
|
memcpy( &m_lpszBuffer[nIndex], Input, nPartLen );
|
|
Transform( m_lpszBuffer );
|
|
for (i = nPartLen; i + 63 < nInputLen; i += 64)
|
|
{
|
|
Transform( &Input[i] );
|
|
}
|
|
nIndex = 0;
|
|
}
|
|
else
|
|
{
|
|
i = 0;
|
|
}
|
|
|
|
// Buffer remaining input
|
|
memcpy( &m_lpszBuffer[nIndex], &Input[i], nInputLen-i);
|
|
}
|
|
|
|
|