}

  private static final HashCode HASH_ABCD =
      HashCode.fromBytes(new byte[] {(byte) 0xaa, (byte) 0xbb, (byte) 0xcc, (byte) 0xdd});

  public void testWriteBytesTo() {
    byte[] dest = new byte[4];
    HASH_ABCD.writeBytesTo(dest, 0, 4);
    assertThat(dest).isEqualTo(new byte[] {(byte) 0xaa, (byte) 0xbb, (byte) 0xcc, (byte) 0xdd});
  }

  public void testWriteBytesToOversizedArray() {

  }

  private static final HashCode HASH_ABCD =
      HashCode.fromBytes(new byte[] {(byte) 0xaa, (byte) 0xbb, (byte) 0xcc, (byte) 0xdd});

  public void testWriteBytesTo() {
    byte[] dest = new byte[4];
    HASH_ABCD.writeBytesTo(dest, 0, 4);
    assertThat(dest).isEqualTo(new byte[] {(byte) 0xaa, (byte) 0xbb, (byte) 0xcc, (byte) 0xdd});
  }

  public void testWriteBytesToOversizedArray() {

  }

  public void testRfc2202_hmacSha1_case6() {
    byte[] key = fillByteArray(80, 0xaa);
    String data = "Test Using Larger Than Block-Size Key - Hash Key First";

    checkSha1("aa4ae5e15272d00e95705637ce8a3b55ed402112", key, data);
  }

  public void testRfc2202_hmacSha1_case7() {
    byte[] key = fillByteArray(80, 0xaa);
    String data = "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data";

    DataInput in = new DataInputStream(new ByteArrayInputStream(data));

    /* Read in various values NORMALLY */
    byte[] b = new byte[3];
    in.readFully(b);
    byte[] expected = {(byte) 0xAA, (byte) 0xBB, (byte) 0xCC};
    assertEquals(expected, b);
  }

  public void testWriteChars() throws IOException {

    /* Write out various test values in LITTLE ENDIAN FORMAT */

    DataInput in = new DataInputStream(new ByteArrayInputStream(data));

    /* Read in various values NORMALLY */
    byte[] b = new byte[3];
    in.readFully(b);
    byte[] expected = {(byte) 0xAA, (byte) 0xBB, (byte) 0xCC};
    assertEquals(expected, b);
  }

  public void testWriteChars() throws IOException {

    /* Write out various test values in LITTLE ENDIAN FORMAT */

        Longs.toByteArray(0x1213141516171819L));
    assertByteArrayEquals(
        new byte[] {
          (byte) 0xFF, (byte) 0xEE, (byte) 0xDD, (byte) 0xCC,
          (byte) 0xBB, (byte) 0xAA, (byte) 0x99, (byte) 0x88
        },
        Longs.toByteArray(0xFFEEDDCCBBAA9988L));
  }

  public void testFromByteArray() {
    assertThat(

		0x4d, 0xcc, 0xcb, 0x4c, 0x4b, 0x2d, 0x2e, 0xd1,
		0x0d, 0x4b, 0x2d, 0x2a, 0xce, 0xcc, 0xcf, 0xb3,
		0x52, 0x30, 0xd4, 0x33, 0xe0, 0xe5, 0x72, 0x2e,
		0x4a, 0x4d, 0x2c, 0x49, 0x4d, 0xd1, 0x75, 0xaa,
		0x04, 0x0a, 0x00, 0x45, 0xf4, 0x0c, 0x8d, 0x15,
		0x34, 0xdc, 0xf3, 0xf3, 0xd3, 0x73, 0x52, 0x15,
		0x3c, 0xf3, 0x92, 0xf5, 0x34, 0x79, 0xb9, 0x78,
		0xb9, 0x00, 0x50, 0x4b, 0x07, 0x08, 0x93, 0x7e,