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Internal/package-cryptography/Drivers/OpensslDriver.php

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+<?php namespace ZN\Cryptography\Drivers;
+/**
+ * ZN PHP Web Framework
+ * 
+ * "Simplicity is the ultimate sophistication." ~ Da Vinci
+ * 
+ * @package ZN
+ * @license MIT [http://opensource.org/licenses/MIT]
+ * @author  Ozan UYKUN [ozan@znframework.com]
+ */
+
+use ZN\Base;
+use ZN\Support;
+use ZN\Datatype;
+use ZN\Cryptography\CryptoMapping;
+use ZN\Cryptography\Exception\InvalidCipherMethodException;
+
+class OpensslDriver extends CryptoMapping
+{
+	/**
+     * Magic constructor
+     * 
+     * @param void
+     * 
+     * @return void
+	 * 
+	 * @codeCoverageIgnore
+     */
+	public function __construct()
+	{
+		Support::func('openssl_open', 'OPENSSL');
+
+		parent::__construct();
+	}
+
+	/**
+     * It encrypts the data.
+     * 
+     * @param string $data
+     * @param string|array  $settings
+     * 
+     * @return string
+     */
+	public function encrypt($data, $settings)
+	{
+		$this->stringParameter($settings);
+
+		$set = $this->_settings($settings);
+
+		$encode = trim(openssl_encrypt($data, $set->cipher, $set->key, 0, $set->iv));
+
+		return base64_encode($encode);
+	}
+
+	/**
+     * It decrypts the data.
+     * 
+     * @param string $data
+     * @param array  $settings
+     * 
+     * @return string
+     */
+	public function decrypt($data, $settings)
+	{
+		$this->stringParameter($settings);
+
+		$set  = $this->_settings($settings);
+		$data = base64_decode($data);
+
+		return trim(openssl_decrypt(trim($data), $set->cipher, $set->key, 0, $set->iv));
+	}
+
+	/**
+     * Generates a random password.
+     * 
+     * @param int $length
+     * 
+     * @return string
+     */
+	public function keygen($length)
+	{
+		return openssl_random_pseudo_bytes($length);
+	}
+
+	/**
+     * protected vector size
+     * 
+     * @param string $cipher
+	 * @param string $key
+     * 
+     * @return string
+     */
+	protected function vectorSize($cipher, $key)
+	{
+		$iv = openssl_cipher_iv_length($cipher);
+
+		return mb_substr(hash('sha1', $key), 0, $iv);
+	}
+
+	/**
+     * protected settings
+     * 
+     * @param array $settings
+     * 
+     * @return object
+     */
+    protected function _settings($settings)
+    {
+		$cipher = $settings['cipher'] ?? 'aes-128';
+	 	$key    = $settings['key']    ?? $this->key;
+		$mode   = $settings['mode']   ?? 'cbc';
+		$cipher = strtolower(Base::suffix($cipher, '-' . $mode));
+
+		if( ! in_array($cipher, openssl_get_cipher_methods()) )
+		{
+			throw new InvalidCipherMethodException(NULL, $cipher); // @codeCoverageIgnore
+		}
+
+		$iv = $settings['vector'] ?? $this->vectorSize($cipher, $key);
+		
+        return (object)
+        [
+            'key'    => $key,
+            'iv'     => $iv,
+            'cipher' => $cipher
+        ];
+	}
+	
+	/**
+	 * protected string parameters
+	 */
+	protected function stringParameter(&$parameters)
+	{
+		if( is_string($parameters) )
+		{
+			$ex = explode('-', $parameters);
+
+			$mode = $ex[count($ex) - 1] ?? '';
+
+			array_pop($ex);
+
+			$settings['mode']   = $mode;
+			$settings['cipher'] = implode('-', $ex);
+
+			$parameters = $settings;
+		}
+	}
+}