96 lines
2.2 KiB
PHP
96 lines
2.2 KiB
PHP
<?php namespace Laravel;
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if (trim(Config::$items['application']['key']) === '')
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{
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throw new \LogicException('The encryption 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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protected 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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protected 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 given string will be encrypted using AES-256 encryption for a high
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* degree of security. The returned string will also be base64 encoded.
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*
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* Mcrypt must be installed on your machine before using this method, and
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* an application key must be specified in the application configuration.
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*
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* <code>
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* // Encrypt a string using the Mcrypt PHP extension
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* $encrypted = Crypter::encrpt('secret');
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* </code>
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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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* The given encrypted value must have been encrypted using Laravel and
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* the application key specified in the application configuration file.
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*
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* Mcrypt must be installed on your machine before using this method.
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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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if (($value = base64_decode($value)) === false)
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{
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throw new \InvalidArgumentException('Decryption error. Input value is not valid base64 data.');
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}
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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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return rtrim(mcrypt_decrypt(static::$cipher, static::key(), $value, static::$mode, $iv), "\0");
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}
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/**
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* Get the input vector size for the cipher and mode.
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*
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* @return int
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*/
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protected static function iv_size()
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{
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return mcrypt_get_iv_size(static::$cipher, static::$mode);
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}
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/**
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* Get the encryption key from the application configuration.
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*
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* @return string
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*/
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protected static function key()
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{
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return Config::$items['application']['key'];
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}
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}
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