tinymeng\OAuth2\Helper\AES

Complexity

Total Complexity

9

Size/Duplication

Total Lines	45
Duplicated Lines	0 %

Importance

Changes	1
Bugs	0	Features	0

5 Methods

Rating	Name	Duplication	Size	Complexity
A	validateKey()	0	4	2
A	validateIv()	0	4	3
A	decrypt()	0	6	2
A	encrypt()	0	6	1
A	getMode()	0	3	1

<?php

namespace tinymeng\OAuth2\Helper;

/**
 * Class AES.
 *
 * @author overtrue <i@overtrue.me>
 */
class AES
{
    public static function encrypt(string $text, string $key, string $iv, int $option = OPENSSL_RAW_DATA): string
    {
        self::validateKey($key);
        self::validateIv($iv);

        return openssl_encrypt($text, self::getMode($key), $key, $option, $iv);
    }

    /**
     * @param string|null $method
     */
    public static function decrypt(string $cipherText, string $key, string $iv, int $option = OPENSSL_RAW_DATA, $method = null): string
    {
        self::validateKey($key);
        self::validateIv($iv);

        return openssl_decrypt($cipherText, $method ?: self::getMode($key), $key, $option, $iv);
    }

    /**
     * @param string $key
     *
     * @return string
     */
    public static function getMode($key)
    {
        return 'aes-'.(8 * strlen($key)).'-cbc';
    }

    public static function validateKey(string $key)
    {
        if (!in_array(strlen($key), [16, 24, 32], true)) {
            throw new \InvalidArgumentException(sprintf('Key length must be 16, 24, or 32 bytes; got key len (%s).', strlen($key)));
        }
    }

    /**
     * @throws \InvalidArgumentException
     */
    public static function validateIv(string $iv)
    {
        if (!empty($iv) && 16 !== strlen($iv)) {
            throw new \InvalidArgumentException('IV length must be 16 bytes.');
        }
    }
}