libgo/go/hash/hash.go

   1 // Copyright 2009 The Go Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style
   3 // license that can be found in the LICENSE file.
   4
   5 package hash
   6
   7 import "io"
   8
   9 // Hash is the common interface implemented by all hash functions.
  10 type Hash interface {
  11         // Write adds more data to the running hash.
  12         // It never returns an error.
  13         io.Writer
  14
  15         // Sum returns the current hash, without changing the
  16         // underlying hash state.
  17         Sum() []byte
  18
  19         // Reset resets the hash to one with zero bytes written.
  20         Reset()
  21
  22         // Size returns the number of bytes Sum will return.
  23         Size() int
  24 }
  25
  26 // Hash32 is the common interface implemented by all 32-bit hash functions.
  27 type Hash32 interface {
  28         Hash
  29         Sum32() uint32
  30 }
  31
  32 // Hash64 is the common interface implemented by all 64-bit hash functions.
  33 type Hash64 interface {
  34         Hash
  35         Sum64() uint64
  36 }