Function ecc_sign_hash 

pub unsafe extern "C" fn ecc_sign_hash(
    in_: *const c_uchar,
    inlen: c_ulong,
    out: *mut c_uchar,
    outlen: *mut c_ulong,
    prng: *mut prng_state,
    wprng: c_int,
    key: *mut ecc_key,
) -> c_int