shift -= 32;
        }
      }

      int k1 = mixK1((int) buffer);
      h1 ^= k1;
      return fmix(h1, len);
    } else {
      return hashBytes(input.toString().getBytes(charset));
    }
  }

  @Override
  public HashCode hashBytes(byte[] input, int off, int len) {
    checkPositionIndexes(off, off + len, input.length);
    int h1 = seed;
    int i;

    ImmutableSet<HashCode> hashCodes =
        ImmutableSet.of(
            SIP_WITH_KEY.hashBytes(col1),
            SIP_WITH_KEY.hashBytes(col2),
            SIP_WITH_KEY.hashBytes(col3));
    assertEquals(3, hashCodes.size());
  }

  public void testToString() {

    ImmutableSet<HashCode> hashCodes =
        ImmutableSet.of(
            SIP_WITH_KEY.hashBytes(col1),
            SIP_WITH_KEY.hashBytes(col2),
            SIP_WITH_KEY.hashBytes(col3));
    assertEquals(3, hashCodes.size());
  }

  public void testToString() {

    int res = 0;
    for (int i = 0; i < reps; i++) {
      res +=
          System.identityHashCode(
              hashFunctionEnum
                  .getHashFunction()
                  .hashBytes(strings[i & SAMPLE_MASK].getBytes(UTF_8)));
    }
    return res;
  }

  @Benchmark
  int hashUtf8GetBytesHasher(int reps) {
    int res = 0;
    for (int i = 0; i < reps; i++) {
      res +=

    assertEquals(hashFunction.hashBytes(bytes), hashFunction.hashBytes(ByteBuffer.wrap(bytes)));
  }

  static void assertHashByteBufferExhaustsBuffer(HashFunction hashFunction) {
    Random rng = new Random(0L);
    byte[] bytes = new byte[rng.nextInt(256) + 1];
    rng.nextBytes(bytes);
    ByteBuffer buffer = ByteBuffer.wrap(bytes);
    HashCode unused = hashFunction.hashBytes(buffer);

    Mac mac = Mac.getInstance(algorithm);
    mac.init(key);
    mac.update(input);

    assertEquals(HashCode.fromBytes(mac.doFinal()), hashFunc.hashBytes(input));
    assertEquals(HashCode.fromBytes(mac.doFinal(input)), hashFunc.hashBytes(input));
  }

  // Tests from RFC2022: https://tools.ietf.org/html/rfc2202

  public void testRfc2202_hmacSha1_case1() {
    byte[] key = fillByteArray(20, 0x0b);

    }
  }

  static class NonStreamingVersion extends AbstractNonStreamingHashFunction {
    @Override
    public int bits() {
      return 32;
    }

    @Override
    public HashCode hashBytes(byte[] input, int off, int len) {
      return HashCode.fromBytes(Arrays.copyOfRange(input, off, off + len));
    }
  }

    verifyNoMoreInteractions(hashFunction, hasher);
  }

  public void testHash_hashesCorrectly() throws Exception {
    byte[] buf = new byte[] {'y', 'a', 'm', 's'};
    HashCode expectedHash = sha512().hashBytes(buf);
    HashingOutputStream out = new HashingOutputStream(sha512(), buffer);

    out.write(buf);

    assertEquals(expectedHash, out.hash());
  }

  public void testChecksForNull() throws Exception {

    assertThat(hashCode.bits()).isAtLeast(32); // sanity
    byte[] hashBytes = hashCode.asBytes();
    int totalBytes = hashCode.bits() / 8;

    for (int bytes = 0; bytes < totalBytes; bytes++) {
      byte[] bb = new byte[bytes];
      hashCode.writeBytesTo(bb, 0, bb.length);

      assertThat(bb).isEqualTo(Arrays.copyOf(hashBytes, bytes));
    }
  }

  private static class ExpectedHashCode {

    verifyNoMoreInteractions(hashFunction, hasher);
  }

  public void testHash_hashesCorrectly() throws Exception {
    byte[] buf = new byte[] {'y', 'a', 'm', 's'};
    HashCode expectedHash = sha512().hashBytes(buf);
    HashingOutputStream out = new HashingOutputStream(sha512(), buffer);

    out.write(buf);

    assertEquals(expectedHash, out.hash());
  }

  public void testChecksForNull() throws Exception {