<?php
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namespace PhpZip\Util;
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use PhpZip\Exception\RuntimeException;
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/**
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* Crypto Utils.
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*
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* @internal
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*/
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class CryptoUtil
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{
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/**
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* Returns random bytes.
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*
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* @param int $length
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*
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* @throws \Exception
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*
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* @return string
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*
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* @deprecated Use random_bytes()
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*/
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final public static function randomBytes($length)
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{
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return random_bytes($length);
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}
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/**
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* Decrypt AES-CTR.
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*
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* @param string $data Encrypted data
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* @param string $key Aes key
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* @param string $iv Aes IV
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*
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* @return string Raw data
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*/
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public static function decryptAesCtr($data, $key, $iv)
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{
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if (\extension_loaded('openssl')) {
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$numBits = \strlen($key) * 8;
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/** @noinspection PhpComposerExtensionStubsInspection */
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return openssl_decrypt($data, 'AES-' . $numBits . '-CTR', $key, \OPENSSL_RAW_DATA, $iv);
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}
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if (\extension_loaded('mcrypt')) {
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return mcrypt_decrypt(\MCRYPT_RIJNDAEL_128, $key, $data, 'ctr', $iv);
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}
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throw new RuntimeException('Extension openssl or mcrypt not loaded');
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}
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/**
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* Encrypt AES-CTR.
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*
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* @param string $data Raw data
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* @param string $key Aes key
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* @param string $iv Aes IV
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*
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* @return string Encrypted data
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*/
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public static function encryptAesCtr($data, $key, $iv)
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{
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if (\extension_loaded('openssl')) {
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$numBits = \strlen($key) * 8;
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/** @noinspection PhpComposerExtensionStubsInspection */
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return openssl_encrypt($data, 'AES-' . $numBits . '-CTR', $key, \OPENSSL_RAW_DATA, $iv);
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}
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if (\extension_loaded('mcrypt')) {
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return mcrypt_encrypt(\MCRYPT_RIJNDAEL_128, $key, $data, 'ctr', $iv);
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}
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throw new RuntimeException('Extension openssl or mcrypt not loaded');
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}
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}
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