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    use *;

    extern "C" {
        pub fn DH_new() -> *mut DH;
        pub fn DH_free(dh: *mut DH);

        pub fn DH_generate_parameters(
            prime_len: c_int,
            generator: c_int,
            callback: Option<extern "C" fn(c_int, c_int, *mut c_void)>,
            cb_arg: *mut c_void,
        ) -> *mut DH;

        pub fn DH_generate_key(dh: *mut DH) -> c_int;
        pub fn DH_compute_key(key: *mut c_uchar, pub_key: *const BIGNUM, dh: *mut DH) -> c_int;
        pub fn DH_size(dh: *const DH) -> c_int;

        pub fn d2i_DHparams(k: *mut *mut DH, pp: *mut *const c_uchar, length: c_long) -> *mut DH;
        pub fn i2d_DHparams(dh: *const DH, pp: *mut *mut c_uchar) -> c_int;

        #[cfg(ossl102)]
        pub fn DH_get_1024_160() -> *mut DH;
        #[cfg(ossl102)]
        pub fn DH_get_2048_224() -> *mut DH;
        #[cfg(ossl102)]
        pub fn DH_get_2048_256() -> *mut DH;

        #[cfg(any(ossl110, libressl270))]
        pub fn DH_set0_pqg(dh: *mut DH, p: *mut BIGNUM, q: *mut BIGNUM, g: *mut BIGNUM) -> c_int;
        #[cfg(any(ossl110, libressl270))]
        pub fn DH_get0_pqg(
            dh: *const DH,
            p: *mut *const BIGNUM,
            q: *mut *const BIGNUM,
            g: *mut *const BIGNUM,
        );

        #[cfg(any(ossl110, libressl270))]
        pub fn DH_get0_key(dh: *const DH, pub_key: *mut *const BIGNUM, priv_key: *mut *const BIGNUM);
    }