87 lines
2.0 KiB
PHP
87 lines
2.0 KiB
PHP
<?php namespace Laravel; isset($GLOBALS['APP_PATH']) or die('No direct script access.');
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if (trim(Config::get('application.key')) === '')
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{
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throw new \Exception('The Crypter class may not be used without an application key.');
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}
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class Crypter {
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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 = MCRYPT_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 = MCRYPT_MODE_CBC;
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/**
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* Encrypt a string using Mcrypt.
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*
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* The string will be encrypted using the AES-256 scheme and will be base64 encoded.
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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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$iv = mcrypt_create_iv(static::iv_size(), MCRYPT_RAND);
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$value = mcrypt_encrypt(static::$cipher, static::key(), $value, static::$mode, $iv);
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return base64_encode($iv.$value);
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}
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/**
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* Decrypt a string using Mcrypt.
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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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$value = base64_decode($value);
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// To decrypt the value, we first need to extract the input vector and
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// the encrypted value. The input vector size varies across different
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// encryption ciphers and modes, so we will get the correct size for
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// the cipher and mode being used by the class.
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$iv = substr($value, 0, static::iv_size());
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$value = substr($value, static::iv_size());
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// Once we have the input vector and the value, we can give them both
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// to Mcrypt for decryption. The value is sometimes padded with \0,
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// so we will trim all of the padding characters from the string.
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$key = static::key();
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return rtrim(mcrypt_decrypt(static::$cipher, $key, $value, static::$mode, $iv), "\0");
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}
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/**
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* Get the input vector size for the cipher and mode.
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*
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* @return int
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*/
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protected static function iv_size()
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{
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return mcrypt_get_iv_size(static::$cipher, static::$mode);
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}
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/**
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* Get the encryption key from the application configuration.
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*
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* @return string
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*/
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protected static function key()
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{
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return Config::get('application.key');
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}
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} |