PHP ActiveX

AES OFB Output Feedback Mode Encryption

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Demonstrates how to encrypt using AES OFB (Output Feedback) mode. PHP ActiveX

<?php

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

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

$crypt->CryptAlgorithm = 'aes';
// 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';

$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('Popular opinions, on subjects not palpable to sense, are often true, but seldom or never the whole truth. -- John Stuart Mill');
print $encStr . "\n";

$decrypt = new COM("Chilkat.Crypt2");
$decrypt->CryptAlgorithm = 'aes';
$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";

?>