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<?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; } }