<?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:----OTE1NDE2NDI4MjM4MDg3NSA4MDU3ODU5ODQyNTQwNzk1IDgwODc4OTY0NzcyNzYxMDM=