Function nginx::ECDSA_do_sign_ex

pub unsafe extern "C" fn ECDSA_do_sign_ex(
    dgst: *const c_uchar, 
    dgstlen: c_int, 
    kinv: *const BIGNUM, 
    rp: *const BIGNUM, 
    eckey: *mut EC_KEY
) -> *mut ECDSA_SIG