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<!-------------------------------     STEP 1      --------------------------->
<!--  Fill in the details (CodeProject will reformat this section for you) -->

<pre>
Title:       ReHash
Author:      Dominik Reichl 
Email:       dominik.reichl@t-online.de
Environment: VC++ 5.0-7.0, NT 4.0, Win95/98/ME, Win2k, WinXP
Keywords:    Hash, Security, Cryptography, Win32
Level:       Intermediate&quot;
Description: A console-based hash calculator. Supported algorithms: CRC-16, CRC-16-CCITT, CRC-32, FCS-16, FCS-32, GHash-32-3, GHash-32-5, GOST-Hash, HAVAL-5-256, MD2, MD4, MD5, SHA-1, SHA-256, SHA-384, SHA-512, Tiger.
Section      Cpp
SubSection   Cryptography
</pre>

<!-------------------------------     STEP 2      --------------------------->
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<ul class=download>
<li><a href="rehash_exe.zip">Download Win32 executable - 167 Kb </a></li>
<li><a href="rehash_src.zip">Download source code - 276 Kb</a></li>
</ul>

<p><img src="rehash.jpg" alt="ReHash screenshot" width="572px" height="341px"></p>

<!-------------------------------     STEP 3      --------------------------->
<!--  Add the article text. Please use simple formatting (<h2>, <p> etc)   --> 
<br>
<h2>Contents</h2>
<ul>
<li><a href="#reintro">Introduction</a></li>
<li><a href="#realgos">Supported algorithms</a></li>
<li><a href="#reusage">Usage</a></li>
<li><a href="#rethanks">Thanks / acknowledgements</a></li>
</ul>

<br>
<h2><a name="reintro">Introduction</a></h2>

ReHash is a free, open source console-based hash calculator.<br><br>
You can disable hash algorithms selectively per command-line if you don't need
or like them, you can choose if you want to use recursive directory scanning or not.<br><br>
This tool is ideal for webmasters who wish to provide their users hash values of
their (downloadable) files. The complete hashing process can be automated by using a
shell/batch script. No additional user interaction is needed (i.e. the program
won't ask for anything, it's just using the command-line).
<br><br>
ReHash is distributed under the terms of the GNU General Public License v2.
<br><br>
<br>
<h2><a name="realgos">Supported algorithms</a></h2>

The current version of ReHash supports the following hash algorithms:<br><br>

<table width="100%" border="1">
<tr bgColor="#F0F0F0">
<td><center><b>Algorithm</b></center></td>
<td><center><b>Standard</b></center></td>
<td><center><b>Inventor</b></center></td>
<td><center><b>Hash Digest Size</b></center></td>
</tr>

<tr><td>CRC-16</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td><div align="right">16 bits</div></td></tr>

<tr bgColor="#F0F0F0"><td>CRC-16-CCITT</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td><div align="right">16 bits</div></td></tr>

<tr><td>CRC-32</td>
<td>ANSI X3.66, FIPS PUB 71</td>
<td>&nbsp;</td>
<td><div align="right">32 bits</div></td></tr>

<tr bgColor="#F0F0F0"><td>FCS-16</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td><div align="right">16 bits</div></td></tr>

<tr><td>FCS-32</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td><div align="right">32 bits</div></td></tr>

<tr bgColor="#F0F0F0"><td>GHash (GHash-32-3, GHash-32-5)</td>
<td>-</td>
<td>-</td>
<td><div align="right">32 bits</div></td></tr>

<tr><td>GOST-Hash</td>
<td>R 34.11-94</td>
<td>&nbsp;</td>
<td><div align="right">256 bits</div></td></tr>

<tr bgColor="#F0F0F0"><td>HAVAL (5 passes, 256 bits)</td>
<td>&nbsp;</td>
<td>Zheng, Pieprzyk,<br>Seberry</td>
<td><div align="right">256 bits</div></td></tr>

<tr><td>MD2</td>
<td>RFC 1319</td>
<td>Rivest</td>
<td><div align="right">128 bits</div></td></tr>

<tr bgColor="#F0F0F0"><td>MD4</td>
<td>RFC 1320</td>
<td>Rivest</td>
<td><div align="right">128 bits</div></td></tr>

<tr><td>MD5</td>
<td>RFC 1321</td>
<td>Rivest</td>
<td><div align="right">128 bits</div></td></tr>

<tr bgColor="#F0F0F0"><td>SHA-1</td>
<td>FIPS PUB 180-1</td>
<td>NIST/NSA</td>
<td><div align="right">160 bits</div></td></tr>

<tr><td>SHA-2 (SHA256/SHA384/SHA512)</td>
<td>&nbsp;</td>
<td>NIST/NSA</td>
<td><div align="right">256/384/512 bits</div></td></tr>

<tr bgColor="#F0F0F0"><td>SizeHash-32</td>
<td>-</td>
<td>-</td>
<td><div align="right">32 bits</div></td></tr>

<tr><td>Tiger</td>
<td>&nbsp;</td>
<td>Anderson, Biham</td>
<td><div align="right">192 bits</div></td></tr>

</table>

<br><br>

<h2><a name="reusage">Usage</a></h2>
<pre>rehash.exe [options] filespec [&gt; outputfile]</pre>
<br>
The command-line is parsed from the left to the right. So if you execute ReHash like this:
<pre>rehash.exe -all -none *.*</pre>
it will output nothing, because you first activate all algorithms and then deactivate them
all.<br><br>
<br>
<b>Some usage examples:</b><br><br>

Hash all INI files in C:\Windows (including subdirectories) using all hash algorithms:
<pre>rehash.exe C:\Windows\*.ini</pre><br>

Hash all INI files in C:\Windows (excluding subdirectories) using all hash algorithms:
<pre>rehash.exe -norecur C:\Windows</pre><br>

Hash all BAT files on C:\ (including subdirectories) using only MD5 and SHA-1
(remember command-line is parsed from the left to the right):
<pre>rehash.exe -none -md5 -sha1 C:\*.bat</pre><br>

Hash all files in C:\Temp (excluding subdirectories) using only the GOST algorithm:
<pre>rehash.exe -norecur -none -gost C:\Temp\*</pre><br>

Hash all ZIP files in C:\homepage (including subdirectories) using only the MD5 algorithm
and output the hashes to C:\homepage\downloads\hashes.txt:
<pre>rehash.exe -none -md5 C:\homepage\*.zip &gt; C:\homepage\downloads\hashes.txt</pre><br>


<b>All options:</b><br><br>

<table width="100%" border="1">
<tr bgColor="#F0F0F0">
<td width="25%"><center><b>Option</b></center></td>
<td><center><b>Description</b></center></td>
</tr>

<tr><td>-help / -h / -?/<br>-version / -v</td>
<td>Print some information about ReHash.</td></tr>

<tr><td>-fullpath / -f</td>
<td>Output the full paths of hashed files.</td></tr>

<tr><td>-nopath</td>
<td>Just output the filenames of hashed files, not the full paths to the files.</td></tr>

<tr><td>-rcrsv / -recur / -r</td>
<td>Recursive scanning. Scan all files in the specified path including files in
subdirectories.</td></tr>

<tr><td>-norcrsv / -norecur</td>
<td>Disable recursive scanning. Scan only the files in the specified path not
including subdirectories.</td></tr>

<tr><td>-all / -a</td>
<td>Enable all algorithms.</td></tr>

<tr><td>-none / -n</td>
<td>Disable all algorithms.</td></tr>

<tr><td>-crc16 / -nocrc16</td>
<td>Enable/disable the CRC-16 algorithm.</td></tr>

<tr><td>-crc16c / -nocrc16c</td>
<td>Enable/disable the CRC-16-CCITT algorithm.</td></tr>

<tr><td>-crc32 / -nocrc32</td>
<td>Enable/disable the CRC-32 algorithm.</td></tr>

<tr><td>-fcs16 / -nofcs16</td>
<td>Enable/disable the FCS-16 algorithm.</td></tr>

<tr><td>-fcs32 / -nofcs32</td>
<td>Enable/disable the FCS-32 algorithm.</td></tr>

<tr><td>-ghash3 / -noghash3</td>
<td>Enable/disable the GHash-3 algorithm.</td></tr>

<tr><td>-ghash5 / -noghash5</td>
<td>Enable/disable the GHash-5 algorithm.</td></tr>

<tr><td>-gost / -nogost</td>
<td>Enable/disable the GOST-Hash algorithm.</td></tr>

<tr><td>-haval / -nohaval</td>
<td>Enable/disable the HAVAL-5-256 algorithm.</td></tr>

<tr><td>-md2 / -nomd2</td>
<td>Enable/disable the MD2 algorithm.</td></tr>
<tr><td>-md4 / -nomd4</td>
<td>Enable/disable the MD4 algorithm.</td></tr>
<tr><td>-md5 / -nomd5</td>
<td>Enable/disable the MD5 algorithm.</td></tr>

<tr><td>-sha1 / -nosha1</td>
<td>Enable/disable the SHA-1 algorithm.</td></tr>
<tr><td>-sha256 / -nosha256</td>
<td>Enable/disable the SHA-256 algorithm.</td></tr>
<tr><td>-sha384 / -nosha384</td>
<td>Enable/disable the SHA-384 algorithm.</td></tr>
<tr><td>-sha512 / -nosha512</td>
<td>Enable/disable the SHA-512 algorithm.</td></tr>

<tr><td>-size32 / -nosize32</td>
<td>Enable/disable the Size-32 algorithm (simply the byte-count of the message).</td></tr>

<tr><td>-tiger / -notiger</td>
<td>Enable/disable the TIGER algorithm.</td></tr>

</table>
<br><br>

<h2><a name="rethanks">Thanks / acknowledgements</a></h2>
Thanks to (no particular order):
<ul>
<li>Markku-Juhani O. Saarinen - GOST-Hash implementation</li>
<li>Yuliang Zheng - HAVAL implementation</li>
<li>Wei Dai - implementations of various algorithms</li>
<li>Dr Brian Gladman - SHA-1/SHA-2 implementation</li>
<li>Tom St Denis - Tiger implementation</li>
</ul>

<br>
<h2>History</h2>
<ul>
<li><b>12 April 2003 - v1.0</b><br>
First public release</li>
</ul>

<br>

<!-------------------------------    That's it!   --------------------------->
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