/** * Sets the key. * * Rijndael supports five different key lengths * * @see setKeyLength() * @access public * @param string $key * @throws \LengthException if the key length isn't supported */ function setKey($key) { switch (strlen($key)) { case 16: case 24: case 32: break; default: throw new \LengthException('Key of size ' . strlen($key) . ' not supported by this algorithm. Only keys of sizes 16, 24 or 32 supported'); } parent::setKey($key); }
/** * Sets the key. * * Keys can be of any length. RC2, itself, uses 8 to 1024 bit keys (eg. * strlen($key) <= 128), however, we only use the first 128 bytes if $key * has more then 128 bytes in it, and set $key to a single null byte if * it is empty. * * If the key is not explicitly set, it'll be assumed to be a single * null byte. * * @see \phpseclib\Crypt\Common\SymmetricKey::setKey() * @access public * @param string $key * @param int $t1 optional Effective key length in bits. * @throws \LengthException if the key length isn't supported */ function setKey($key, $t1 = false) { $this->orig_key = $key; if ($t1 === false) { $t1 = $this->default_key_length; } if ($t1 < 1 || $t1 > 1024) { throw new \LengthException('Key size of ' . $length . ' bits is not supported by this algorithm. Only keys between 1 and 1024 bits, inclusive, are supported'); } $this->current_key_length = $t1; // Key byte count should be 1..128. $key = strlen($key) ? substr($key, 0, 128) : ""; $t = strlen($key); // The mcrypt RC2 implementation only supports effective key length // of 1024 bits. It is however possible to handle effective key // lengths in range 1..1024 by expanding the key and applying // inverse pitable mapping to the first byte before submitting it // to mcrypt. // Key expansion. $l = array_values(unpack('C*', $key)); $t8 = $t1 + 7 >> 3; $tm = 0xff >> 8 * $t8 - $t1; // Expand key. $pitable = $this->pitable; for ($i = $t; $i < 128; $i++) { $l[$i] = $pitable[$l[$i - 1] + $l[$i - $t]]; } $i = 128 - $t8; $l[$i] = $pitable[$l[$i] & $tm]; while ($i--) { $l[$i] = $pitable[$l[$i + 1] ^ $l[$i + $t8]]; } // Prepare the key for mcrypt. $l[0] = $this->invpitable[$l[0]]; array_unshift($l, 'C*'); parent::setKey(call_user_func_array('pack', $l)); }