php-cipher

Intro

About

• A simple abstraction for PHP's mcrypt extension.
• Limited but easy-to-use OOP-style functionality.
• This class is not entirely idiot-proof, however.
• Defaults to AES-256-CBC w/ SHA-256 hashed key.
• The IV (if applicable) is embedded in the encrypted output; the decrypt method expects the IV to be prefixed.
• encrypt will accept any data type - it internally serializes the input.
• Key and data padding is not necessary, PHP does this internally.

Included Files

• See examples.php for usage.
• Class is in Cipher.php.
• An interactive form is available as interactive.php.

Usage

Basic

$key    = 'secret one @!#$';
$cipher = 'blowfish';
$mode   = 'cbc';
$algo   = 'sha256';
$cbcBlowfish = new Cipher($key,$cipher,$mode,$algo);
$cbcBlowfishEncrypted = $cbcBlowfish->encrypt('Top Secret Stuff');
$cbcBlowfishDecrypted = $cbcBlowfish->decrypt($cbcBlowfishEncrypted);

Persistent

Since the IV prefixed the encrypted output automatically, it can be easily decrypted later on:

$key    = 'correct horse battery staple';
$cipher = 'rijndael-256';
$mode   = 'cbc';
$algo   = 'whirlpool';

// remember, Cipher can accept any serializable data type
$data   = array('just','an','example');

// something on page one
$persistent1 = new Cipher($key,$cipher,$mode,$algo); 
$persistentEncrypted = $persistent1->encrypt($$data);
// do something with $persistentEncrypted

// and at a later date use the same Cipher configuration to decrypt
$persistent2 = new Cipher($key,$cipher,$mode,$algo);
$persistentDecrypted = $persistent2->decrypt($persistentEncrypted);

// do something with the decrypted data
$isIdentical = count(array_diff($data,$persistentDecrypted)) === 0;

License: BSD 3-Clause

Copyright (c) 2014, Andrew Zammit zammit.andrew@gmail.com (zamnuts) All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

• Neither the name of Andrew Zammit nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.