mirror of
https://port.numenaute.org/aleajactaest/khanat-code-old.git
synced 2024-11-30 07:35:59 +00:00
85 lines
No EOL
3.3 KiB
PHP
85 lines
No EOL
3.3 KiB
PHP
<?php
|
|
/**
|
|
* Basic encryption/decryption class.
|
|
* We use this class atm for encrypting & decrypting the imap passwords.
|
|
*/
|
|
class MyCrypt{
|
|
|
|
private $config; /**< array that should contain the enc_method & hash_method & key */
|
|
|
|
|
|
/**
|
|
* constructor.
|
|
* loads the config array with the given argument.
|
|
* @param $cryptinfo an array containing the info needed to encrypt & decrypt.(enc_method & hash_method & key)
|
|
*/
|
|
function __construct($cryptinfo) {
|
|
$this->config = $cryptinfo;
|
|
}
|
|
|
|
/**
|
|
* encrypts by using the given enc_method and hash_method.
|
|
* It will first check if the methods are supported, if not it will throw an error, if so it will encrypt the $data
|
|
* @param $data the string that we want to encrypt.
|
|
* @return the encrypted string.
|
|
*/
|
|
public function encrypt($data) {
|
|
|
|
self::check_methods($this->config['enc_method'], $this->config['hash_method']);
|
|
$iv = self::hashIV($this->config['key'], $this->config['hash_method'], openssl_cipher_iv_length($this->config['enc_method']));
|
|
$infostr = sprintf('$%s$%s$', $this->config['enc_method'], $this->config['hash_method']);
|
|
return $infostr . openssl_encrypt($data, $this->config['enc_method'], $this->config['key'], false, $iv);
|
|
}
|
|
|
|
/**
|
|
* decrypts by using the given enc_method and hash_method.
|
|
* @param $edata the encrypted string that we want to decrypt
|
|
* @return the decrypted string.
|
|
*/
|
|
public function decrypt($edata) {
|
|
$e_arr = explode('$', $edata);
|
|
if( count($e_arr) != 4 ) {
|
|
Throw new Exception('Given data is missing crucial sections.');
|
|
}
|
|
$this->config['enc_method'] = $e_arr[1];
|
|
$this->config['hash_method'] = $e_arr[2];
|
|
self::check_methods($this->config['enc_method'], $this->config['hash_method']);
|
|
$iv = self::hashIV($this->config['key'], $this->config['hash_method'], openssl_cipher_iv_length($this->config['enc_method']));
|
|
return openssl_decrypt($e_arr[3], $this->config['enc_method'], $this->config['key'], false, $iv);
|
|
}
|
|
|
|
/**
|
|
* hashes the key by using a hash method specified.
|
|
* @param $key the key to be hashed
|
|
* @param $method the metho of hashing to be used
|
|
* @param $iv_size the size of the initialization vector.
|
|
* @return return the hashed key up till the size of the iv_size param.
|
|
*/
|
|
private static function hashIV($key, $method, $iv_size) {
|
|
$myhash = hash($method, $key, TRUE);
|
|
while( strlen($myhash) < $iv_size ) {
|
|
$myhash .= hash($method, $myhash, TRUE);
|
|
}
|
|
return substr($myhash, 0, $iv_size);
|
|
}
|
|
|
|
/**
|
|
* checks if the encryption and hash methods are supported
|
|
* @param $enc the encryption method.
|
|
* @param $hash the hash method.
|
|
* @throw Exception in case a method is not supported.
|
|
*/
|
|
private static function check_methods($enc, $hash) {
|
|
|
|
if( ! function_exists('openssl_encrypt') ) {
|
|
Throw new Exception('openssl_encrypt() not supported.');
|
|
} else if( ! in_array($enc, openssl_get_cipher_methods()) ) {
|
|
Throw new Exception('Encryption method ' . $enc . ' not supported.');
|
|
} else if( ! in_array(strtolower($hash), hash_algos()) ) {
|
|
Throw new Exception('Hashing method ' . $hash . ' not supported.');
|
|
}
|
|
}
|
|
|
|
|
|
|
|
} |