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// Copyright 2009 The Go Authors. All rights reserved.

// Use of this source code is governed by a BSD-style

// license that can be found in the LICENSE file.

// Package hash provides interfaces for hash functions.

package hash

import "io"

// Hash is the common interface implemented by all hash functions.

type Hash interface {

        // Write adds more data to the running hash.

        // It never returns an error.

        io.Writer

        // Sum appends the current hash to b and returns the resulting slice.

        // It does not change the underlying hash state.

        Sum(b []byte) []byte

        // Reset resets the hash to one with zero bytes written.

        Reset()

        // Size returns the number of bytes Sum will return.

        Size() int

        // BlockSize returns the hash's underlying block size.

        // The Write method must be able to accept any amount

        // of data, but it may operate more efficiently if all writes

        // are a multiple of the block size.

        BlockSize() int

}

// Hash32 is the common interface implemented by all 32-bit hash functions.

type Hash32 interface {

        Hash

        Sum32() uint32

}

// Hash64 is the common interface implemented by all 64-bit hash functions.

type Hash64 interface {

        Hash

        Sum64() uint64

}