mcrypt_enc_get_iv_size
Returns the size of the IV of the opened algorithm
WarningThis function has been
DEPRECATED as of PHP 7.1.0 and
REMOVED as of PHP 7.2.0. Relying on this function
is highly discouraged.
Description
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.
Parameters
-
td
-
The encryption descriptor.
Return Values
Returns the size of the IV, or 0 if the IV is ignored by the algorithm.