pkey_ctx: add set dsa paramgen bits

        Ok(())

    }

    /// Sets the DSA paramgen bits.

    ///

    /// This is only useful for DSA keys.

    #[corresponds(EVP_PKEY_CTX_set_dsa_paramgen_bits)]

    #[inline]

    pub fn set_dsa_paramgen_bits(&mut self, bits: u32) -> Result<(), ErrorStack> {

        unsafe {

            cvt(ffi::EVP_PKEY_CTX_set_dsa_paramgen_bits(

                self.as_ptr(),

                bits as i32,

            ))?;

        }

        Ok(())

    }

    /// Returns the RSA padding mode in use.

    ///

    /// This is only useful for RSA keys.