Function libsodium_sys::crypto_stream_xsalsa20_xor

pub unsafe extern fn crypto_stream_xsalsa20_xor(c: *mut u8,
                                                m: *const u8,
                                                mlen: c_ulonglong,
                                                n: *const [u8; 24],
                                                k: *const [u8; 32])
                                                -> c_int