Expose `Cipher::cipher_final_unchecked`

            assert!(output.len() >= block_size);

        }

        unsafe { self.cipher_final_unchecked(output) }

    }

    /// Finalizes the encryption or decryption process.

    ///

    /// Any remaining data will be written to the output buffer.

    ///

    /// Returns the number of bytes written to `output`.

    ///

    /// This function is the same as [`Self::cipher_final`] but with

    /// the output buffer size check removed.

    ///

    /// SAFETY: The caller is expected to provide `output` buffer

    /// large enough to contain correct number of bytes. For streaming

    /// ciphers the output buffer can be empty, for block ciphers the

    /// output buffer should be at least as big as the block.

    #[corresponds(EVP_CipherFinal)]

    pub unsafe fn cipher_final_unchecked(

        &mut self,

        output: &mut [u8],

    ) -> Result<usize, ErrorStack> {

        let mut outl = 0;

        unsafe {

        cvt(ffi::EVP_CipherFinal(

            self.as_ptr(),

            output.as_mut_ptr(),

            &mut outl,

        ))?;

        }

        Ok(outl as usize)

    }