GopayHelper – replace mcrypt functions for PHP 7.2

gopay_helper.php

<?php
	public static function encrypt($data, $secureKey) {
		return GopayHelper::encrypt_php72($data, $secureKey, 'DES-EDE3');
 	}
	
  	public static function decrypt($data, $secureKey) {
		return GopayHelper::decrypt_php72($data, $secureKey, 'DES-EDE3');
 	}

	/**
	 * @param string $data
	 * @param string $key
	 * @param string $method
	 * @return string
	 */
	public static function encrypt_php72(string $data, string $key, string $method): string
	{
		$data_padded = $data;
		if (strlen($data_padded) % 8) {
			$data_padded = str_pad($data_padded,
				strlen($data_padded) + 8 - strlen($data_padded) % 8, "\0");
		}

		$ivSize = openssl_cipher_iv_length($method);
		$iv = openssl_random_pseudo_bytes($ivSize);

		$encrypted = openssl_encrypt($data_padded, $method, $key, OPENSSL_RAW_DATA | OPENSSL_NO_PADDING, $iv);

		return bin2hex($encrypted);
	}

	/**
	 * @param string $data
	 * @param string $key
	 * @param string $method
	 * @return string
	 */
	public static function decrypt_php72(string $data, string $key, string $method): string
	{
		$data = GopayHelper::convert($data);

		$ivSize = openssl_cipher_iv_length($method);
		$iv = substr($data, 0, $ivSize);

		$data = openssl_decrypt(substr($data, $ivSize), $method, $key, OPENSSL_RAW_DATA | OPENSSL_NO_PADDING, $iv);

		return trim($data);
	}