Function EC_KEY_METHOD_set_sign

pub unsafe extern "C" fn EC_KEY_METHOD_set_sign(
    meth: *mut ec_key_method_st,
    sign: Option<unsafe extern "C" fn(i32, *const u8, i32, *mut u8, *mut u32, *const bignum_st, *const bignum_st, *mut ec_key_st) -> i32>,
    sign_setup: Option<unsafe extern "C" fn(*mut ec_key_st, *mut bignum_ctx, *mut *mut bignum_st, *mut *mut bignum_st) -> i32>,
    sign_sig: Option<unsafe extern "C" fn(*const u8, i32, *const bignum_st, *const bignum_st, *mut ec_key_st) -> *mut ECDSA_SIG_st>,
)