<?php

namespace WPFitter\Aws\Crypto;

/** @internal */
abstract class MaterialsProviderV2 implements MaterialsProviderInterfaceV2
{
    private static $supportedKeySizes = [128 => \true, 256 => \true];
    /**
     * Returns if the requested size is supported by AES.
     *
     * @param int $keySize Size of the requested key in bits.
     *
     * @return bool
     */
    public static function isSupportedKeySize($keySize)
    {
        return isset(self::$supportedKeySizes[$keySize]);
    }
    /**
     * Returns the wrap algorithm name for this Provider.
     *
     * @return string
     */
    public abstract function getWrapAlgorithmName();
    /**
     * Takes an encrypted content encryption key (CEK) and material description
     * for use decrypting the key according to the Provider's specifications.
     *
     * @param string $encryptedCek Encrypted key to be decrypted by the Provider
     *                             for use decrypting other data.
     * @param string $materialDescription Material Description for use in
     *                                    decrypting the CEK.
     * @param string $options Options for use in decrypting the CEK.
     *
     * @return string
     */
    public abstract function decryptCek($encryptedCek, $materialDescription, $options);
    /**
     * @param string $keySize Length of a cipher key in bits for generating a
     *                        random content encryption key (CEK).
     * @param array $context Context map needed for key encryption
     * @param array $options Additional options to be used in CEK generation
     *
     * @return array
     */
    public abstract function generateCek($keySize, $context, $options);
    /**
     * @param string $openSslName Cipher OpenSSL name to use for generating
     *                            an initialization vector.
     *
     * @return string
     */
    public function generateIv($openSslName)
    {
        return \openssl_random_pseudo_bytes(\openssl_cipher_iv_length($openSslName));
    }
}
