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<P><B><FONT face=Verdana size=5>RSA MD5 Message Digest </FONT></B></P>
<P align=justify><B><FONT face=Verdana size=2>Summary</FONT></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana"><B><BR></B></SPAN><FONT
face=Verdana size=2>This is a Visual C++ implementation of the RSA MD5 message
digest algorithm. The algorithm calculates a 32 byte checksum for any data
sequence (e.g., array of bytes, a string or a file). Full details of the MD5
algorithm are provided within the code. </FONT></P>
<P align=center><FONT face=Verdana size=2><BR><IMG height=451
alt="Screenshot of MD5 Test Program" src="RSA MD5 Doc_files/MD5ScreenShot1.jpg"
width=579 border=0></FONT></P>
<P align=center><B><U><FONT face=Verdana size=2>MD5 Checksum Test
Program</FONT></U></B></P>
<P align=justify><B><FONT face=Verdana size=2>Download</FONT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Verdana"><BR></SPAN></B><FONT face=Verdana
size=2>The download consists of two Visual C++ V6 projects, the executable
program itself, test data files and documentation.</FONT>
<P><B><FONT face=Verdana size=2>Download Contents</FONT></B></P>
<BLOCKQUOTE><FONT face=Verdana size=2><B>MD5 Library Source Code
(MD5.dsw)</B></FONT><BR><FONT face=Verdana size=2>This Visual C++ project
builds a static library that provides the MD5 calculation routines. The source
code will unzip to a folder named 'Code'. The library will build to 'Release'
or 'Debug' subfolders. Do not change this folder configuration if you wish to
build the MD5 Test Program (see below).<BR></FONT><BR><FONT face=Verdana
size=2><B>MD5 Test Program Source Code
(MD5ChecksumTest.dsw)</B></FONT><BR><FONT face=Verdana size=2>This Visual C++
project builds an executable program that uses the MD5 library to calculate
checksums. The source code will unzip to a folder named 'Test'. The executable
will build to 'Release' or 'Debug' subfolders. The MD5 Library is a dependent
subproject and so will build automatically before the test program. The MD5
library source code must be held in a folder named 'Code' which should be at
the same level as the 'Test' folder. This is the default folder configuration
created by the zip file. <BR></FONT><BR><FONT face=Verdana size=2><B>MD5 Test
Program Executable (MD5ChecksumTest.exe)</B></FONT><BR><FONT
face=Verdana size=2>This is the executable program built by the MD5 Test
Program Source Code (see screenshot above). It can be used to calculate the
MD5 checksum for manually entered strings or for individual files.
<BR></FONT><BR><FONT face=Verdana size=2><B>Test Data</B></FONT><BR><FONT
face=Verdana size=2>Several test data files are included within the test
program source code and executable zip files. These test files will unzip to a
folder named 'TestData'. The MD5 Test program uses these files to perform an
automatic self verification. It expects to find them within the TestData
subfolder.</FONT>
<P><FONT face=Verdana size=2><B>Documentation<BR></B>A copy of this web page
is included in the download. The majority of the projects' documentation is in
the form of commented source code. </FONT></P></BLOCKQUOTE>
<P align=justify><FONT face=Verdana size=2><B>Further Details - MD5
Library<BR></B><SPAN style="FONT-WEIGHT: 400">The MD5 message digest algorithm
is wrapped in a C++ class named CMD5Checksum. This exports three public
functions:-</SPAN></FONT></P>
<BLOCKQUOTE>
<P align=justify><CODE><SPAN style="FONT-WEIGHT: 400"><FONT face=Verdana
size=2>● CString GetMD5( BYTE* pBuf, UINT nLength )<BR>● CString
GetMD5( CFile& File )<BR>● CString GetMD5( const CString&
strFilePath ) </FONT></SPAN></P></CODE></BLOCKQUOTE>
<P align=justify><FONT face=Verdana size=2>All three are implemented as static
functions. The checksum calculated is returned as a 32 character hexadecimal
number held in a CString. GetMD5 is overloaded to take data to be checksummed as
either an array of bytes or as a file. The class CMD5Checksum is held within the
MD5 library source code. Building this project creates the static library
MD5.lib. </FONT></P>
<P align=justify><FONT face=Verdana size=2><B>Further Details - MD5 Test
Program<BR></B>A demonstration and test environment is provided in the MD5 test
program. This allows the user to:-</FONT></P>
<BLOCKQUOTE>
<P align=justify><SPAN style="FONT-WEIGHT: 400"><FONT face=Verdana
size=2>● </FONT></SPAN><FONT face=Verdana size=2>Type a string and see
its checksum calculated in real time<BR></FONT><SPAN
style="FONT-WEIGHT: 400"><FONT face=Verdana size=2>● </FONT></SPAN><FONT
face=Verdana size=2>Select a file and calculate its checksum <BR></FONT><SPAN
style="FONT-WEIGHT: 400"><FONT face=Verdana size=2>● Perform an
automatic self verification<BR>● Get performance figures
<BR></P></BLOCKQUOTE></FONT></SPAN>
<P align=justify><FONT face=Verdana size=2>The user may type into the "Enter a
string" edit box; the corresponding checksum will be calculated and displayed in
real time. The test program source code download includes test data files. The
user may browse and choose a file for checksum in the "Select a file" edit box;
the file's checksum is then displayed. The checksums for the smaller test files
may be verified by typing the contents directly into the "Enter a string" edit
box. Obviously, the checksums obtained by both methods should be the same! The
test environment also includes a "Self Test" button. This checksums each of the
supplied test data files in turn and verifies the results. Finally, a
"Performance Test" is provided. This displays and records statistics that
indicate the execution speed of the checksum calculation. Thus, the performance
implications of any modifications to the implementation can be assessed.
</FONT></P>
<P align=justify><B><FONT face=Verdana size=2>Public Domain</FONT></B><FONT
face=Verdana size=2><BR>This implementation of the RSA MD5 algorithm was
developed by Langfine Ltd and has been placed in the public domain for free use.
However, wherever it is used, the RSA copyright notices must be adhered to, as
described within the code and the test application's "About" box. Also, Langfine
must be credited. If the code is modified in any way, this should be mentioned.
Source code should clearly distinguish between Langfine's original code and the
modifications. </FONT></P>
<P align=justify><font face="Verdana" size="2"><b>Version History</b><br>
V1.2 Performance indicators added.<br>
V1.1 Performance improved by making some functions inline.<br>
V1.0 First release.</font></P>
<P align=justify><FONT face=Verdana size=2><B>Disclaimer<BR></B>This download is
provided free of charge by Langfine Ltd. All use is at your own risk. No
liability of any kind whatsoever is accepted by Langfine Ltd. See <A
href="file:///D:/Data%20-%20Webs/Langfine%20-%20Software%20for%20the%203Rs/Legal.htm">Disclaimers</A>.
</FONT></P>
<P align=justify><B><FONT face=Verdana size=2>Comments</FONT></B><FONT
face=Verdana size=2><BR>Comments are welcome at <A
href="mailto:md5@langfine.com">md5@langfine.com</A>. If you improve the
implementation in any way, we will be happy to update our code and make your
changes available here.</FONT></P>
<P align=justify><font face="Verdana" size="2"><b>Updates</b><br>
Please visit the downloads section of our website for updates;
<a href="http://www.langfine.com">www.langfine.com</a>. </font></P>
<P align=justify> </P>
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