(PHP Extension) AES Encrypt String (utf-8 byte representation) and return Base64

Demonstrates how to AES encrypt the utf-8 byte representation of a string and return in base64 format.

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

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

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

$crypt = new CkCrypt2();

$crypt->put_CryptAlgorithm('aes');
$crypt->put_CipherMode('cbc');
$crypt->put_KeyLength(256);
$crypt->put_Charset('utf-8');
$crypt->put_EncodingMode('base64');

$ivHex = '000102030405060708090A0B0C0D0E0F';
$crypt->SetEncodedIV($ivHex,'hex');
$keyHex = '000102030405060708090A0B0C0D0E0F101112131415161718191A1B1C1D1E1F';
$crypt->SetEncodedKey($keyHex,'hex');

$encryptedStr = $crypt->encryptStringENC('This is the original string');
print $encryptedStr . "\n";

// Let's say we want to URL encode the base64 string..
$crypt->put_CryptAlgorithm('none');
$crypt->put_EncodingMode('url');
$urlEncoded = $crypt->encryptStringENC($encryptedStr);
print $urlEncoded . "\n";

// Sample output:

//  q3fmgEqjqa9o//ZS6aPuh4Wtbrrxx/WOIQSKeVnesZg=
//  q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D

// -------------------------------------------------------------------
// Now let's do the reverse...
// 

// We start with a string that is the binary encrypted data, base64 encoded, and then URL encoded.
$encBase64Url = 'q3fmgEqjqa9o%2F%2FZS6aPuh4Wtbrrxx%2FWOIQSKeVnesZg%3D';

// We'll use the same crypt object.  If using a new instance of the crypt object,
// make sure *all* settings are identical:  the algorithm, cipher mode, key length, charset, encoding mode, IV, and secret key.

// Decode from URL...
$crypt->put_CryptAlgorithm('none');
$crypt->put_EncodingMode('url');
$encBase64 = $crypt->decryptStringENC($urlEncoded);
print $encBase64 . "\n";

// Now decrypt...
$crypt->put_CryptAlgorithm('aes');
$crypt->put_EncodingMode('base64');
$originalStr = $crypt->decryptStringENC($encBase64);
print $originalStr . "\n";

?>