Returns the size of the IV of the opened algorithm


(PHP 4 >= 4.0.2, PHP 5)

mcrypt_enc_get_iv_sizeReturns the size of the IV of the opened algorithm

Описание

int mcrypt_enc_get_iv_size ( resource $td )

This function returns the size of the IV of the algorithm specified by the encryption descriptor in bytes. An IV is used in cbc, cfb and ofb modes, and in some algorithms in stream mode.

Список параметров

td

The encryption descriptor.

Возвращаемые значения

Returns the size of the IV, or 0 if the IV is ignored by the algorithm.