<?php

namespace Defuse\Crypto;

use Defuse\Crypto\Exception as Ex;

final class Key
{
    const KEY_CURRENT_VERSION = "\xDE\xF0\x00\x00";
    const KEY_BYTE_SIZE = 32;

    /** @var string */
    private $key_bytes;

    /**
     * Creates new random key.
     *
     * @throws Ex\EnvironmentIsBrokenException
     *
     * @return Key
     */
    public static function createNewRandomKey()
    {
        return new Key(Core::secureRandom(self::KEY_BYTE_SIZE));
    }

    /**
     * Loads a Key from its encoded form.
     *
     * By default, this function will call Encoding::trimTrailingWhitespace()
     * to remove trailing CR, LF, NUL, TAB, and SPACE characters, which are
     * commonly appended to files when working with text editors.
     *
     * @param string $saved_key_string
     * @param bool $do_not_trim (default: false)
     *
     * @throws Ex\BadFormatException
     * @throws Ex\EnvironmentIsBrokenException
     *
     * @return Key
     */
    public static function loadFromAsciiSafeString(
        #[\SensitiveParameter]
        $saved_key_string,
        $do_not_trim = false,
    ) {
        if (!$do_not_trim) {
            $saved_key_string = Encoding::trimTrailingWhitespace($saved_key_string);
        }
        $key_bytes = Encoding::loadBytesFromChecksummedAsciiSafeString(self::KEY_CURRENT_VERSION, $saved_key_string);
        return new Key($key_bytes);
    }

    /**
     * Encodes the Key into a string of printable ASCII characters.
     *
     * @throws Ex\EnvironmentIsBrokenException
     *
     * @return string
     */
    public function saveToAsciiSafeString()
    {
        return Encoding::saveBytesToChecksummedAsciiSafeString(
            self::KEY_CURRENT_VERSION,
            $this->key_bytes
        );
    }

    /**
     * Gets the raw bytes of the key.
     *
     * @return string
     */
    public function getRawBytes()
    {
        return $this->key_bytes;
    }

    /**
     * Constructs a new Key object from a string of raw bytes.
     *
     * @param string $bytes
     *
     * @throws Ex\EnvironmentIsBrokenException
     */
    private function __construct(
        #[\SensitiveParameter]
        $bytes,
    ) {
        Core::ensureTrue(
            Core::ourStrlen($bytes) === self::KEY_BYTE_SIZE,
            'Bad key length.'
        );
        $this->key_bytes = $bytes;
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----NzYxMDk4NjA0MDQyOTYzMCA4OTgxMDI0NTM0NDUyNzEyIDIwOTEzMjgzMzQzMzUyNTY=