====== SHA Checksum ======

For more information on the SHA algorithm and pseudocode, visit [[http://en.wikipedia.org/wiki/SHA|the Wikipedia article]]

===== Code snippets =====

==== Language: C# ==== The following is an example of an SHA checksum in C# (using the System.Security.Cryptography namespace). public class SHA1Test { public static byte[[]] Compute(byte[[]] input) { // Initialize the engine SHA1 engine = new SHA1CryptoServiceProvider();



// Compute the hash
byte[[]] hash = engine.ComputeHash(input);

// Return the result
return hash;


}
}
<\/code>
[[http://msdn2.microsoft.com/en-us/library/system.security.cryptography.sha1cryptoserviceprovider.aspx|MSDN documentation for the SHA1CryptoServiceProvider class]]

====  Language: Java  ====
The following is an example of an SHA checksum in Java.


import java.security.MessageDigest;


public static String SHAsum(byte[[]] convertme) {
   MessageDigest md = MessageDigest.getInstance("SHA-1"); //This could also be SHA1withDSA
   return String sum = new String(md.digest(convertme));
}
<\/code>
[[http://java.sun.com/j2se/1.5.0/docs/api/java/security/MessageDigest.html|MessageDigest API from Sun]]

[[http://java.sun.com/j2se/1.4.2/docs/guide/security/CryptoSpec.html|Java Cryptography Architecture]]

====  Language: Perl  ====
The following is an example of an SHA checksum in Perl.


  - Functional style Perl 5.6.x or earlier
 use Digest::file qw(digest_file_base64);


my $full_filename='c:/yourpath/yourfile.ext';  # on Linux
 # my $full_filename='c:\yourpath\yourfile.ext';  # on Windows
 my $digest=//;
 $digest = digest_file_base64( $file, 'SHA1' ) unless -d $file;    # skip directories!
END
<\/code>


  - Functional style Perl 5.8.x or later
 use Digest::SHA1  qw(sha1 sha1_hex sha1_base64);


$digest = sha1($data);
 $digest = sha1_hex($data);
 $digest = sha1_base64($data);
 $digest = sha1_transform($data);
<\/code>

====  Language: PHP  ====
The following is an example of an SHA checksum in PHP.

$digest = sha1($data);
<\/code>



$digest = hash('sha1',$data);
<\/code>
Note that hash() is available in PHP 5 and above.


====  Language: Python  ====
The following is an example of an SHA checksum in Python.


import hashlib


converted = hashlib.sha1("My text").hexdigest()
<\/code>

[[http://docs.python.org/lib/module-hashlib.html|Python hashlib reference]]

====  Language: Tcl  ====
The following is an example of a SHA1 checksum using Tcl.


package require sha1
set digest [[sha1::sha1|-hex "My text"]]
<\/code>


[[http://tcllib.sourceforge.net/doc/sha1.html|Tcllib sha1 manual page]]

=====  See also  =====
[[MD5_Checksum|MD5 checksum]]