<?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 $do_not_trim (default: false)
     *
     * @throws Ex\BadFormatException
     * @throws Ex\EnvironmentIsBrokenException
     *
     * @return Key
     */
    public static function loadFromAsciiSafeString($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 $bytes
     *
     * @throws Ex\EnvironmentIsBrokenException
     */
    private function __construct($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:----NTE3NTI2OTY2OTgxNDAzMCAzMjk4NDg1MDQyODcwMzUzIDcyNTM4MzUwNzQ3NTc5MDI=