MD5

Revision as of 07:15, 18 May 2007

Author: Matthew Wegner

Overview

This C# code snippet generates an MD5 hash for an input string. The formatting will match the output of PHP's md5() function.

C#

Best placed in your static-only utility class.

<csharp>public string Md5Sum(string strToEncrypt) { System.Text.UTF8Encoding ue = new System.Text.UTF8Encoding(); byte[] bytes = ue.GetBytes(strToEncrypt);

// encrypt bytes System.Security.Cryptography.MD5CryptoServiceProvider md5 = new System.Security.Cryptography.MD5CryptoServiceProvider(); byte[] hashBytes = md5.ComputeHash(bytes);

// Convert the encrypted bytes back to a string (base 16) string hashString = "";

for (int i = 0; i < hashBytes.Length; i++) { hashString += System.Convert.ToString(hashBytes[i], 16).PadLeft(2, '0'); }

return hashString.PadLeft(32, '0'); } </csharp>

JavaScript

... and just in case anyone was wondering. This is also possible using JavaScript:

<javascript>import System; import System.Text; import System.Security.Cryptography;

static function Md5Sum(strToEncrypt) { var encoding = UTF8Encoding(); var bytes = encoding.GetBytes(strToEncrypt);

// encrypt bytes var md5 = MD5CryptoServiceProvider(); var hashBytes = md5.ComputeHash(bytes);

// Convert the encrypted bytes back to a string (base 16) var hashString = "";

for (var i = 0; i < hashBytes.Length; i++) { hashString += Convert.ToString(hashBytes[i], 16).PadLeft(2, '0'); }

return hashString.PadLeft(32, '0'); }</javascript>

You can use SHA1CryptoServiceProvider instead of MD5CryptoServiceProvider if you want to create SHA1 hashes instead of MD5 hashes.

The server side

As noted above, the above unity snippets will return a hash matching the one returned from PHP's md5() function. In case you are using another language on the server side, here are some examples:

Perl

<perl> use Digest::MD5 qw(md5_hash);

my $hashString = md5_hash($stringToHash); </perl>

Python

<python> import md5

def Md5Sum(inputString):

  m = md5.new()
  m.update(inputString)
  return m.hexdigest()

</python>

Shell

Requires that you have the md5sum program installed on the server. <bash> HASH = `echo "$STRING_TO_HASH" | md5sum | cut -f 1 -d' '` </bash>