Function EC_KEY_METHOD_get_sign

pub unsafe extern "C" fn EC_KEY_METHOD_get_sign(
    meth: *const ec_key_method_st,
    psign: *mut Option<unsafe extern "C" fn(_: i32, _: *const u8, _: i32, _: *mut u8, _: *mut u32, _: *const bignum_st, _: *const bignum_st, _: *mut ec_key_st) -> i32>,
    psign_setup: *mut Option<unsafe extern "C" fn(_: *mut ec_key_st, _: *mut bignum_ctx, _: *mut *mut bignum_st, _: *mut *mut bignum_st) -> i32>,
    psign_sig: *mut Option<unsafe extern "C" fn(_: *const u8, _: i32, _: *const bignum_st, _: *const bignum_st, _: *mut ec_key_st) -> *mut ECDSA_SIG_st>,
)