If your database is stolen, the thief won't have your users' plaintext passwords, only the hashes.

So, the thief won't be able to try to use that password in another system (as many users use the same password everywhere, this would be dangerous).

## Install `passlib`

PassLib is a great Python package to handle password hashes.

It supports many secure hashing algorithms and utilities to work with them.

  }

  private Hasher fromHashers(Hasher[] hashers) {
    return new Hasher() {
      @Override
      public Hasher putByte(byte b) {
        for (Hasher hasher : hashers) {
          hasher.putByte(b);
        }
        return this;
      }

      @Override
      public Hasher putBytes(byte[] bytes) {
        for (Hasher hasher : hashers) {
          hasher.putBytes(bytes);
        }

            appendCollectionToHasherKeepingOrder(hasher, sortedFingerprints);
        }
    },
    KEEP_ORDER {
        @Override
        public void appendToHasher(Hasher hasher, Collection<FileSystemLocationFingerprint> fingerprints) {
            appendCollectionToHasherKeepingOrder(hasher, fingerprints);
        }
    };

    public abstract void appendToHasher(Hasher hasher, Collection<FileSystemLocationFingerprint> fingerprints);

        Hasher hasher = Hashing.newHasher();
        addToHash(hasher, spec.getClassNames());
        addToHash(hasher, spec.getPackageNames());
        addToHash(hasher, spec.getPackagePrefixes());
        addToHash(hasher, spec.getResourcePrefixes());
        addToHash(hasher, spec.getResourceNames());
        addToHash(hasher, spec.getDisallowedClassNames());

        HashCode dependenciesHash
    ) {
        Hasher hasher = Hashing.newHasher();
        hasher.putString(normalizedInputArtifactPath);
        hasher.putString(producerBuildTreePath);
        hasher.put(secondaryInputsSnapshot);
        hasher.putHash(dependenciesHash);
        return new TransformWorkspaceIdentity(secondaryInputsSnapshot, hasher.hash());
    }

    hasher.putShort((short) 0x0201);
    hasher.assertBytes(new byte[] {1, 2});
  }

  public void testInt() {
    TestHasher hasher = new TestHasher();
    hasher.putInt(0x04030201);
    hasher.assertBytes(new byte[] {1, 2, 3, 4});
  }

  public void testLong() {
    TestHasher hasher = new TestHasher();
    hasher.putLong(0x0807060504030201L);
    hasher.assertBytes(new byte[] {1, 2, 3, 4, 5, 6, 7, 8});

	}
	indexes := subTreeIndex(0, n, nil)
	hashes, err := r.ReadHashes(indexes)
	if err != nil {
		return Hash{}, err
	}
	if len(hashes) != len(indexes) {
		return Hash{}, fmt.Errorf("tlog: ReadHashes(%d indexes) = %d hashes", len(indexes), len(hashes))
	}
	hash, hashes := subTreeHash(0, n, hashes)
	if len(hashes) != 0 {
		panic("tlog: bad index math in TreeHash")
	}
	return hash, nil
}

            hasher.putInt(bytes.length);
            hasher.putBytes(bytes);
        }

        @Override
        public void putBytes(byte[] bytes, int off, int len) {
            hasher.putInt(len);
            hasher.putBytes(bytes, off, len);
        }

        @Override
        public void putHash(HashCode hashCode) {
            hasher.putInt(hashCode.length());
            hasher.putHash(hashCode);

        transform.applyConfigurationTo(hasher);
        return hasher.hash();
    }

    private static ClasspathFileHasher createFileHasherWithConfig(HashCode configHash, ClasspathFileHasher fileHasher) {
        return sourceSnapshot -> {
            Hasher hasher = Hashing.newHasher();
            hasher.putHash(configHash);
            hasher.putHash(fileHasher.hashOf(sourceSnapshot));

  private final ByteBuffer scratch = ByteBuffer.allocate(8).order(ByteOrder.LITTLE_ENDIAN);

  /** Updates this hasher with the given byte. */
  protected abstract void update(byte b);

  /** Updates this hasher with the given bytes. */
  protected void update(byte[] b) {
    update(b, 0, b.length);
  }

  /** Updates this hasher with {@code len} bytes starting at {@code off} in the given buffer. */