Description
int
mcrypt_get_iv_size ( string cipher, string mode)
int
mcrypt_get_iv_size ( resource td)
The first prototype is when linked against libmcrypt 2.2.x, the
second when linked against libmcrypt 2.4.x.
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 algorithm specified.
