(PHP 4 = 4.0.2)
The first prototype is when linked against libmcrypt
2.2.x, the second when linked against libmcrypt 2.4.x or
higher.
mcrypt_get_iv_size() returns the
size of the Initialisation Vector (IV) in bytes. On error the
function returns FALSE. If
the IV is ignored in the specified cipher/mode combination
zero is returned.
cipher is one of the
MCRYPT_ciphername constants of the name of the algorithm as
string.
mode is one of the
MCRYPT_MODE_modename constants of one of "ecb", "cbc", "cfb",
"ofb", "nofb" or "stream".
td is the resource
that is returned by
mcrypt_module_open().
|
See also: mcrypt_create_iv()