OpenSSL PHP example

openssl-example.php

<?php

class protector {

	private $passphrase = null;
	private $private_key = null;
	private $public_key = null;

	public function __construct() {

	}

	public function __destruct() {

	}

	public function encrypt($unencrypted_data) {
		if (empty($this->public_key)) {
			throw new api_exception('Please set the public key before attempting encryption.');
		}
	
		$public_key = openssl_pkey_get_public($this->public_key);
		if (!$public_key) {
			throw new api_exception('Please set a valid public key before attempting encryption.');
		}

		$encrypted_data = '';
		openssl_public_encrypt($unencrypted_data, $encrypted_data, $public_key);

		return($encrypted_data);
	}


	public function decrypt($encrypted_data) {
		if (empty($this->private_key)) {
			throw new api_exception('Please set the private key before attempting decryption.');
		}

		$private_key = openssl_pkey_get_private($this->private_key, $this->passphrase);
		if (!$private_key) {
			throw new api_exception('Please set a valid private key before attempting decryption.');
		}

		$unencrypted_data = '';
		openssl_private_decrypt($encrypted_data, $unencrypted_data, $private_key);

		return($unencrypted_data);
	}

	public function set_passphrase($passphrase) {
		$this->passphrase = trim($passphrase);
		return($this);
	}

	public function set_private_key($private_key) {
		$this->private_key = trim($private_key);
		return($this);
	}

	public function set_public_key($public_key) {
		$this->public_key = trim($public_key);
		return($this);
	}

	public function get_private_key() {
		return($this->private_key);
	}

	public function get_public_key() {
		return($this->public_key);
	}

}

nice