(PHP ActiveX) Blowfish OFB Output Feedback Mode Encryption

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Crypt2')
$crypt = new COM("Chilkat.Crypt2");

// Use "blowfish2" to produce correct results that match published blowfish test vectors.
$crypt->CryptAlgorithm = 'blowfish2';
// Set the cipher mode to Output Feedback
$crypt->CipherMode = 'ofb';
$crypt->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->EncodingMode = 'hex';

// The block size of the blowfish algoirthm is 8 bytes, therefore the IV is 8 bytes.
$ivHex = '0001020304050607';
$crypt->SetEncodedIV($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('Emergencies have always been the pretext on which the safeguards of individual liberty have been eroded. -- Friedrich Hayek');
print $encStr . "\n";

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Crypt2')
$decrypt = new COM("Chilkat.Crypt2");
$decrypt->CryptAlgorithm = 'blowfish2';
$decrypt->CipherMode = 'ofb';
$decrypt->KeyLength = 256;
$decrypt->EncodingMode = 'hex';
$decrypt->SetEncodedIV($ivHex,'hex');
$decrypt->SetEncodedKey($keyHex,'hex');

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

?>