// Copyright 2017 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package hash_test
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import (
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"bytes"
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"crypto/sha256"
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"encoding"
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"fmt"
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"log"
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)
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func Example_binaryMarshaler() {
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const (
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input1 = "The tunneling gopher digs downwards, "
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input2 = "unaware of what he will find."
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)
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first := sha256.New()
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first.Write([]byte(input1))
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marshaler, ok := first.(encoding.BinaryMarshaler)
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if !ok {
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log.Fatal("first does not implement encoding.BinaryMarshaler")
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}
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state, err := marshaler.MarshalBinary()
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if err != nil {
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log.Fatal("unable to marshal hash:", err)
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}
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second := sha256.New()
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unmarshaler, ok := second.(encoding.BinaryUnmarshaler)
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if !ok {
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log.Fatal("second does not implement encoding.BinaryUnmarshaler")
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}
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if err := unmarshaler.UnmarshalBinary(state); err != nil {
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log.Fatal("unable to unmarshal hash:", err)
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}
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first.Write([]byte(input2))
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second.Write([]byte(input2))
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fmt.Printf("%x\n", first.Sum(nil))
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fmt.Println(bytes.Equal(first.Sum(nil), second.Sum(nil)))
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// Output:
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// 57d51a066f3a39942649cd9a76c77e97ceab246756ff3888659e6aa5a07f4a52
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// true
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}
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