Function libsodium::crypto_box_curve25519xsalsa20poly1305_open

pub unsafe extern "C" fn crypto_box_curve25519xsalsa20poly1305_open(
    m: *mut c_uchar, 
    c: *const c_uchar, 
    clen: c_ulonglong, 
    n: *const c_uchar, 
    pk: *const c_uchar, 
    sk: *const c_uchar
) -> c_int