<?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:----ODc2MTE0NzU0ODQwNjQwNSA3MDM3MzY5NTg4NzU5NjQ0IDczMzkzNjA1OTYyMjE2Mzc=