Function ocb3_init 

pub unsafe extern "C" fn ocb3_init(
    ocb: *mut ocb3_state,
    cipher: c_int,
    key: *const c_uchar,
    keylen: c_ulong,
    nonce: *const c_uchar,
    noncelen: c_ulong,
    taglen: c_ulong,
) -> c_int