121 lines
3.0 KiB
PHP
121 lines
3.0 KiB
PHP
<?php namespace System;
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class Crypt {
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/**
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* The encryption cipher.
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*
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* @var string
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*/
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public static $cipher = 'rijndael-256';
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/**
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* The encryption mode.
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*
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* @var string
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*/
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public static $mode = 'cbc';
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/**
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* Encrypt a value using the MCrypt library.
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*
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* @param string $value
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* @return string
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*/
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public static function encrypt($value)
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{
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// -----------------------------------------------------
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// Determine the input vector source. Different servers
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// and operating systems will have varying options.
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// -----------------------------------------------------
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if (defined('MCRYPT_DEV_URANDOM'))
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{
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$random = MCRYPT_DEV_URANDOM;
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}
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elseif (defined('MCRYPT_DEV_RANDOM'))
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{
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$random = MCRYPT_DEV_RANDOM;
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}
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else
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{
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$random = MCRYPT_RAND;
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}
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// -----------------------------------------------------
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// The system random number generator must be seeded
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// to produce adequately random results.
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// -----------------------------------------------------
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if ($random === MCRYPT_RAND)
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{
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mt_srand();
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}
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$iv = mcrypt_create_iv(static::iv_size(), $random);
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$value = mcrypt_encrypt(static::$cipher, static::key(), $value, static::$mode, $iv);
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// -----------------------------------------------------
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// We use base64 encoding to get a nice string value.
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// -----------------------------------------------------
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return base64_encode($iv.$value);
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}
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/**
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* Decrypt a value using the MCrypt library.
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*
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* @param string $value
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* @return string
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*/
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public static function decrypt($value)
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{
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// -----------------------------------------------------
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// Since all of our encrypted values are base64 encoded,
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// we will decode the value here and verify it.
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// -----------------------------------------------------
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$value = base64_decode($value, true);
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if ( ! $value)
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{
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throw new \Exception('Decryption error. Input value is not valid base64 data.');
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}
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// -----------------------------------------------------
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// Extract the input vector from the value.
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// -----------------------------------------------------
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$iv = substr($value, 0, static::iv_size());
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// -----------------------------------------------------
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// Remove the input vector from the encrypted value.
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// -----------------------------------------------------
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$value = substr($value, static::iv_size());
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return rtrim(mcrypt_decrypt(static::$cipher, static::key(), $value, static::$mode, $iv), "\0");
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}
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/**
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* Get the application key.
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*
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* @return string
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*/
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private static function key()
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{
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if (is_null($key = Config::get('application.key')) or $key == '')
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{
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throw new \Exception("The encryption class can not be used without an encryption key.");
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}
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return $key;
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}
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/**
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* Get the input vector size for the cipher and mode.
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*
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* Different ciphers and modes use varying lengths of input vectors.
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*
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* @return int
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*/
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private static function iv_size()
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{
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return mcrypt_get_iv_size(static::$cipher, static::$mode);
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}
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} |