mockedCrypto.when(Crypto::getMD5).thenReturn(mockMd5);
            when(mockMd5.getDigestLength()).thenReturn(16); // MD5 digest length is 16
            HMACT64 hmac = new HMACT64(TEST_KEY);
            assertEquals(16, hmac.engineGetDigestLength());
            verify(mockMd5, times(1)).getDigestLength();
        }
    }

    @Test
    void testEngineDigest() throws NoSuchAlgorithmException {

        } catch (final Exception ex) {
            throw new IllegalStateException();
        }
    }

    @Override
    protected int engineGetDigestLength() {
        return md5.getDigestLength();
    }

    @Override
    protected void engineReset() {
        md5.reset();
        md5.update(ipad);
    }

    @Override
    protected void engineUpdate(final byte b) {

        } catch (final Exception ex) {
            throw new IllegalStateException();
        }
    }

    @Override
    protected int engineGetDigestLength() {
        return this.md5.getDigestLength();
    }

    @Override
    protected void engineReset() {
        this.md5.reset();
        this.md5.update(this.ipad);
    }

    @Override
    protected void engineUpdate(final byte b) {