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<?php |
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/** |
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* URLCrypt |
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* |
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* PHP library to securely encode and decode short pieces of arbitrary binary data in URLs. |
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* |
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* (c) Guillermo Gonzalez |
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* |
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* For the full copyright and license information, please view the COPYING |
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* file that was distributed with this source code. |
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*/ |
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namespace Atrapalo\UrlCrypt; |
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/** |
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* Class UrlCrypt |
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* @package Atrapalo\UrlCrypt |
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*/ |
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class UrlCrypt |
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{ |
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public $table = "1bcd2fgh3jklmn4pqrstAvwxyz567890"; |
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private $ivSize; |
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private $cipher = 'AES-128-CBC'; |
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public function __construct(string $table = null) |
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{ |
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$this->ivSize = openssl_cipher_iv_length($this->cipher); |
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if (!is_null($table) && $table != '') { |
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$this->table = $table; |
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} |
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} |
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public static function getInstance(string $table = null): UrlCrypt |
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{ |
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return new self($table); |
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} |
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public function encode(string $string): string |
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{ |
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$table = str_split($this->table, 1); |
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$size = strlen($string) * 8 / 5; |
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$stringArray = str_split($string, 1); |
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$message = ""; |
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foreach ($stringArray as $char) { |
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$message .= str_pad(decbin(ord($char)), 8, "0", STR_PAD_LEFT); |
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} |
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$message = str_pad($message, ceil(strlen($message) / 5) * 5, "0", STR_PAD_RIGHT); |
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$encodeString = ""; |
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for ($i = 0; $i < $size; $i++) { |
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$encodeString .= $table[bindec(substr($message, $i * 5, 5))]; |
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} |
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return $encodeString; |
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} |
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public function decode(string $string): string |
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{ |
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$table = str_split($this->table, 1); |
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$size = strlen($string) * 5 / 8; |
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$stringArray = str_split($string, 1); |
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$message = ""; |
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foreach ($stringArray as $char) { |
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$message .= str_pad(decbin(array_search($char, $table)), 5, "0", STR_PAD_LEFT); |
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} |
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$originalString = ''; |
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for ($i = 0; $i < floor($size); $i++) { |
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$originalString .= chr(bindec(substr($message, $i * 8, 8))); |
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} |
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return $originalString; |
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} |
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public function encrypt(string $string, string $key): string |
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{ |
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$key = $this->prepareKey($key); |
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$iv = openssl_random_pseudo_bytes($this->ivSize); |
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$cipherText = openssl_encrypt($string, $this->cipher, $key, OPENSSL_RAW_DATA, $iv); |
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if(false === $cipherText) { |
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$this->throwOpensslError(); |
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} |
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return $this->encode(base64_encode($cipherText).'::'.base64_encode($iv)); |
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} |
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public function decrypt(string $string, string $key): string |
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{ |
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$string = $this->decode($string); |
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if (strpos($string, '::') === false) { |
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return $this->legacyDecrypt($string, $key); |
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} |
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$key = $this->prepareKey($key); |
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list($string, $iv) = explode('::', $string); |
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$string = openssl_decrypt(base64_decode($string), $this->cipher, $key, OPENSSL_RAW_DATA, base64_decode($iv)); |
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return $string; |
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} |
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private function prepareKey(string $key): string |
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{ |
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if (is_null($key) || $key == "") { |
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throw new \Exception('No key provided.'); |
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} |
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return md5($key, true); |
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} |
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private function isHexString(string $string): string |
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{ |
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return (preg_match('/^[0-9a-f]+$/i', $string) === 1); |
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} |
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private function throwOpensslError() |
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{ |
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$message = ''; |
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while ($msg = openssl_error_string()) { |
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$message .= "{$msg}. "; |
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} |
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throw new \RuntimeException(trim($message)); |
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} |
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private function legacyDecrypt(string $string, string $key): string |
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{ |
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$key = $this->legacyPrepareKey($key); |
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$iv = substr($string, 0, $this->ivSize); |
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$string = substr($string, $this->ivSize); |
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$string = openssl_decrypt($string, $this->cipher, $key, OPENSSL_RAW_DATA|OPENSSL_ZERO_PADDING, $iv); |
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preg_match_all('#([\\000]+)$#', $string, $matches); |
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if (isset($matches[1][0]) && mb_strlen($matches[1][0], '8bit') > 1) { |
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$string = rtrim($string, "\0"); |
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} |
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return $string; |
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} |
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private function legacyPrepareKey(string $key): string |
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{ |
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if (is_null($key) || $key == "") { |
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throw new \Exception('No key provided.'); |
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} |
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if (in_array(strlen($key), [32, 48, 64]) && $this->isHexString($key)) { |
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return pack('H*', $key); |
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} elseif (in_array(strlen($key), [16, 24, 32])) { |
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return $key; |
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} else { |
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return md5($key); |
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} |
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} |
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} |
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atrapalo /
URLcrypt
