PHP Extension

PBKDF2 - Derive Key from Password

See more Encryption Examples

Demonstrates how to derive a symmetric encryption key from a password using PBKDF2. PHP Extension

<?php

include("chilkat.php");

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$crypt = new CkCrypt2();

$pw = 'password';

$pwCharset = 'utf-8';

// Such as sha256, sha512
$hashAlg = 'sha256';

// 16 bytes
$saltHex = '78578E5A5D63CB0668AB39B21C8637FA';

$iterationCount = 100000;

// Derive a 256-bit key from the password.
$outputBitLen = 256;

// 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";

// Sample output:
// AE96E261E32792D0FD6F0E72F8E872D046F7DB4C1FA7C83892EC73C49F461B70

?>