PBKDF2 - Derive Key from Password

Demonstrates how to derive a symmetric encryption key from a password using PBKDF2. This example matches the results found at this URL: http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

Download Chilkat Crypt ActiveX

<?php

$crypt = new COM("Chilkat.Crypt2");

$success = $crypt->UnlockComponent('Anything for 30-day trial');
if ($success != true) {
    print $crypt->lastErrorText() . "\n";
    exit;
}

//  http://www.di-mgt.com.au/cryptoKDFs.html#examplespbkdf

$pw = 'password';
$pwCharset = 'ansi';
//  Hash algorithms may be: sha1, md2, md5, etc.
$hashAlg = 'sha1';
//  The salt should be 8 bytes:
$saltHex = '78578E5A5D63CB06';
$iterationCount = 2048;
//  Derive a 192-bit key from the password.
$outputBitLen = 192;

//  The derived key is returned as a hex or base64 encoded string.
//  (Note: The salt argument must be a string that also uses
//  the same encoding.)
$enc = 'hex';

$hexKey = $crypt->pbkdf2($pw,$pwCharset,$hashAlg,$saltHex,$iterationCount,$outputBitLen,$enc);

print $hexKey . "\n";

//  The output should have this value:
//  BFDE6BE94DF7E11DD409BCE20A0255EC327CB936FFE93643


?>