PHP Simple Encryption (php-simple-encryption)

A PHP library that makes encryption and decryption of text easy.

Requirements

• PHP 7.2+
• Openssl PHP extension

Installation

Simply add a dependency on stymiee/php-simple-encryption to your project's composer.json file if you use Composer to manage the dependencies of your project.

Here is a minimal example of a composer.json file that just defines a dependency on PHP Simple Encryption:

{
    "require": {
        "stymiee/php-simple-encryption": "^1"
    }
}

Basic Usage

To get a more detailed introduction to this library, visit the PHP Simple Encryption tutorial on my blog.

require('./vendor/autoload.php');

use Encryption\Encryption;
use Encryption\Exception\EncryptionException;

$text = 'The quick brown fox jumps over the lazy dog';
$key  = 'secretkey';
try {
    $encryption = Encryption::getEncryptionObject();
    $iv = $encryption->generateIv();
    $encryptedText = $encryption->encrypt($text, $key, $iv);
    $decryptedText = $encryption->decrypt($encryptedText, $key, $iv);

    printf('Cipher   : %s%s', $encryption->getName(), PHP_EOL);
    printf('Encrypted: %s%s', $encryptedText, PHP_EOL);
    printf('Decrypted: %s%s', $decryptedText, PHP_EOL);
    printf('Version  : %s%s', Encryption::VERSION, PHP_EOL);
}
catch (EncryptionException $e) {
    echo $e;
}

Outputs

Cipher   : AES-256-CBC
Encrypted: lierDqV4Qo3Cm87YU01K+YnQsDGrFsYypjHJVZaagqfLFg7xb2T7b9qfqb4NcoIGcTzqvQbOx72AVgbuRFxqgg==
Decrypted: The quick brown fox jumps over the lazy dog
Version  : 1

An exception may be thrown if:

• An invalid/unsupported cipher is attempted to be used (Encryption\Exception\InvalidCipherException)
• A cipher available in openssl but yet implemented is attempted to be used (Encryption\Exception\CipherNotImplementedException)
• generateIv() is unable to generate a initialization vector (Encryption\Exception\GenerateIvException).
• Encryption::encrypt() is unable to encrypt the data (Encryption\Exception\EncryptException).
• Encryption::decrypt() is unable to decrypt the data (Encryption\Exception\DecryptException).

Supported Ciphers

The PHP Simple Encryption library currently defaults to AES-256-CBC. This may change in future versions and will result in a major version bump when this occurs. You can check the version of your library by calling Encryption::VERSION. This library is currently on version "1".

To determine what cipher you are using you can call the getName() method on your encryption object.

$encryption = Encryption::getEncryptionObject();
$cipherName = $encryption->getName(); // AES-256-CBC

To get a list of ciphers supported by your system and this library you can call Encryption::listAvailableCiphers() to receive an array of available ciphers. This list is an intersection of available ciphers from your system's installed version of Openssl and ciphers supported by this library.

Total ciphers supported: 139
Default cipher: AES-256-CBC (version 1)

AES	Aria/Blowfish	Camellia/Cast5/SM4	DES/Idea/RC2/RC4/Seed
aes-128-cbc	aria-128-cbc	camellia-128-cbc	des-cbc
aes-128-cbc-hmac-sha1	aria-128-ccm	camellia-128-cfb	des-cfb
aes-128-cbc-hmac-sha256	aria-128-cfb	camellia-128-cfb	des-cfb1
aes-128-ccm	aria-128-cfb1	camellia-128-cfb	des-cfb8
aes-128-cfb	aria-128-cfb8	camellia-128-ctr	des-ecb
aes-128-cfb1	aria-128-ctr	camellia-128-ecb	des-ede
aes-128-cfb8	aria-128-ecb	camellia-128-ofb	des-ede3
aes-128-ctr	aria-128-gcm	camellia-192-cbc	des-ede-cbc
aes-128-ecb	aria-128-ofb	camellia-192-cfb	des-ede-cfb
aes-128-gcm	aria-192-cbc	camellia-192-cfb	des-ede-ofb
aes-128-ofb	aria-192-ccm	camellia-192-cfb	des-ede3-cbc
aes-128-xts	aria-192-cfb	camellia-192-ctr	des-ede3-cfb
aes-192-cbc	aria-192-cfb1	camellia-192-ecb	des-ede3-cfb1
aes-192-ccm	aria-192-cfb8	camellia-192-ofb	des-ede3-cfb8
aes-192-cfb	aria-192-ctr	camellia-256-cbc	des-ede3-ofb
aes-192-cfb1	aria-192-ecb	camellia-256-cfb	des-ofb
aes-192-cfb8	aria-192-gcm	camellia-256-cfb	desx-cbc
aes-192-ctr	aria-192-ofb	camellia-256-cfb	id-aes128-ccm
aes-192-ecb	aria-256-cbc	camellia-256-ctr	id-aes128-gcm
aes-192-gcm	aria-256-ccm	camellia-256-ecb	id-aes192-ccm
aes-192-ofb	aria-256-cfb	camellia-256-ofb	id-aes192-gcm
aes-256-cbc	aria-256-cfb1	cast5-cbc	id-aes256-ccm
aes-256-cbc-hmac-sha1	aria-256-cfb8	cast5-cfb	id-aes256-gcm
aes-256-cbc-hmac-sha256	aria-256-ctr	cast5-ecb	idea-cbc
aes-256-ccm	aria-256-ecb	cast5-ofb	idea-cfb
aes-256-cfb	aria-256-gcm	chacha20	idea-ecb
aes-256-cfb1	aria-256-ofb	chacha20-poly1305	idea-ofb
aes-256-cfb8	bf-cbc	seed-cbc	rc2-40-cbc
aes-256-ctr	bf-cfb	seed-cfb	rc2-64-cbc
aes-256-ecb	bf-ecb	seed-ecb	rc2-cbc
aes-256-gcm	bf-ofb	seed-ofb	rc2-cfb
aes-256-ofb	sm4-cbc		rc2-ecb
aes-256-xts	sm4-cfb		rc2-ofb
	sm4-ctr		rc4
	sm4-ecb		rc4-40
			rc4-hmac-md5

Notes

If the text to be encrypted contains trailing null characters they will be removed when decrypting those values.

Some ciphers may not work on your version of PHP. The newer your version of PHP (and its openssl extension), the more ciphers that will be available to you.

Support

If you require assistance using this library start by viewing the HELP.md file included in this package. It includes common problems and their solutions.

If you need additional assistance, I can be found at Stack Overflow. Be sure when you ask a question pertaining to the usage of this library be sure to tag your question with the PHP and encryption tags. Make sure you follow their guide for asking a good question as poorly asked questions will be closed, and I will not be able to assist you.

A good question will include all the following:

• A description of the problem (what are you trying to do? what results are you expecting? what results are you actually getting?)
• The code you are using (only post the relevant code)
• Your unencrypted text
• The key you are using
• The IV you are using
• The output of your method call(s)
• Any error message(s) you are getting

Do not use Stack Overflow to report bugs. Bugs may be reported here.