Function ocb_decrypt_verify_memory 

pub unsafe extern "C" fn ocb_decrypt_verify_memory(
    cipher: c_int,
    key: *const c_uchar,
    keylen: c_ulong,
    nonce: *const c_uchar,
    ct: *const c_uchar,
    ctlen: c_ulong,
    pt: *mut c_uchar,
    tag: *const c_uchar,
    taglen: c_ulong,
    stat: *mut c_int,
) -> c_int