(PHP Extension) Twofish OFB Output Feedback Mode Encryption

Demonstrates how to encrypt using Twofish OFB (Output Feedback) mode.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux

<?php

include("chilkat.php");
// Use "chilkat_9_5_0.php" for versions of Chilkat < 10.0.0

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

$crypt = new CkCrypt2();

$crypt->put_CryptAlgorithm('twofish');
// Set the cipher mode to Output Feedback
$crypt->put_CipherMode('ofb');
$crypt->put_KeyLength(256);

// EncodingMode specifies the encoding of the output for
// encryption, and the input for decryption.
// It may be "hex", "url", "base64", "quoted-printable", or many other choices.
$crypt->put_EncodingMode('hex');

$ivHex = '000102030405060708090A0B0C0D0E0F';
$crypt->SetEncodedIV($ivHex,'hex');

// The secret key must equal the size of the key.  For
// 256-bit encryption, the binary secret key is 32 bytes.
$keyHex = '603deb1015ca71be2b73aef0857d77811f352c073b6108d72d9810a30914dff4';
$crypt->SetEncodedKey($keyHex,'hex');

// Encrypt a string...
$encStr = $crypt->encryptStringENC('Without music to decorate it, time is just a bunch of boring production deadlines or dates by which bills must be paid. -- Frank Zappa');
print $encStr . "\n";

$decrypt = new CkCrypt2();
$decrypt->put_CryptAlgorithm('twofish');
$decrypt->put_CipherMode('ofb');
$decrypt->put_KeyLength(256);
$decrypt->put_EncodingMode('hex');
$decrypt->SetEncodedIV($ivHex,'hex');
$decrypt->SetEncodedKey($keyHex,'hex');

// Now decrypt:
$decStr = $decrypt->decryptStringENC($encStr);
print $decStr . "\n";

?>