Golang hdkeychain.NewKeyFromString函數代碼示例

// EmpowerSeries adds the given extended private key (in raw format) to the
// series with the given ID, thus allowing it to sign deposit/withdrawal
// scripts. The series with the given ID must exist, the key must be a valid
// private extended key and must match one of the series' extended public keys.
//
// This method must be called with the Pool's manager unlocked.
func (p *Pool) EmpowerSeries(seriesID uint32, rawPrivKey string) error {
	// make sure this series exists
	series := p.Series(seriesID)
	if series == nil {
		str := fmt.Sprintf("series %d does not exist for this voting pool",
			seriesID)
		return newError(ErrSeriesNotExists, str, nil)
	}

	// Check that the private key is valid.
	privKey, err := hdkeychain.NewKeyFromString(rawPrivKey)
	if err != nil {
		str := fmt.Sprintf("invalid extended private key %v", rawPrivKey)
		return newError(ErrKeyChain, str, err)
	}
	if !privKey.IsPrivate() {
		str := fmt.Sprintf(
			"to empower a series you need the extended private key, not an extended public key %v",
			privKey)
		return newError(ErrKeyIsPublic, str, err)
	}

	pubKey, err := privKey.Neuter()
	if err != nil {
		str := fmt.Sprintf("invalid extended private key %v, can't convert to public key",
			rawPrivKey)
		return newError(ErrKeyNeuter, str, err)
	}

	lookingFor := pubKey.String()
	found := false

	// Make sure the private key has the corresponding public key in the series,
	// to be able to empower it.
	for i, publicKey := range series.publicKeys {
		if publicKey.String() == lookingFor {
			found = true
			series.privateKeys[i] = privKey
		}
	}

	if !found {
		str := fmt.Sprintf(
			"private Key does not have a corresponding public key in this series")
		return newError(ErrKeysPrivatePublicMismatch, str, nil)
	}

	if err = p.saveSeriesToDisk(seriesID, series); err != nil {
		return err
	}

	return nil
}

// BenchmarkSerialize benchmarks how long it takes to serialize a private
// extended key.
func BenchmarkSerialize(b *testing.B) {
	b.StopTimer()
	masterKey, err := hdkeychain.NewKeyFromString(bip0032MasterPriv1)
	if err != nil {
		b.Errorf("Failed to decode master seed: %v", err)
	}
	b.StartTimer()

	for i := 0; i < b.N; i++ {
		masterKey.String()
	}
}

// BenchmarkDeriveHardened benchmarks how long it takes to derive a hardened
// child from a master private extended key.
func BenchmarkDeriveHardened(b *testing.B) {
	b.StopTimer()
	masterKey, err := hdkeychain.NewKeyFromString(bip0032MasterPriv1)
	if err != nil {
		b.Errorf("Failed to decode master seed: %v", err)
	}
	b.StartTimer()

	for i := 0; i < b.N; i++ {
		masterKey.Child(hdkeychain.HardenedKeyStart)
	}
}

// decryptExtendedKey uses Manager.Decrypt() to decrypt the encrypted byte slice and return
// an extended (public or private) key representing it.
//
// This method must be called with the Pool's manager unlocked.
func (p *Pool) decryptExtendedKey(keyType waddrmgr.CryptoKeyType, encrypted []byte) (*hdkeychain.ExtendedKey, error) {
	decrypted, err := p.manager.Decrypt(keyType, encrypted)
	if err != nil {
		str := fmt.Sprintf("cannot decrypt key %v", encrypted)
		return nil, newError(ErrCrypto, str, err)
	}
	result, err := hdkeychain.NewKeyFromString(string(decrypted))
	zero.Bytes(decrypted)
	if err != nil {
		str := fmt.Sprintf("cannot get key from string %v", decrypted)
		return nil, newError(ErrKeyChain, str, err)
	}
	return result, nil
}

// TestErrors performs some negative tests for various invalid cases to ensure
// the errors are handled properly.
func TestErrors(t *testing.T) {
	// Should get an error when seed has too few bytes.
	net := &chaincfg.MainNetParams
	_, err := hdkeychain.NewMaster(bytes.Repeat([]byte{0x00}, 15), net)
	if err != hdkeychain.ErrInvalidSeedLen {
		t.Errorf("NewMaster: mismatched error -- got: %v, want: %v",
			err, hdkeychain.ErrInvalidSeedLen)
	}

	// Should get an error when seed has too many bytes.
	_, err = hdkeychain.NewMaster(bytes.Repeat([]byte{0x00}, 65), net)
	if err != hdkeychain.ErrInvalidSeedLen {
		t.Errorf("NewMaster: mismatched error -- got: %v, want: %v",
			err, hdkeychain.ErrInvalidSeedLen)
	}

	// Generate a new key and neuter it to a public extended key.
	seed, err := hdkeychain.GenerateSeed(hdkeychain.RecommendedSeedLen)
	if err != nil {
		t.Errorf("GenerateSeed: unexpected error: %v", err)
		return
	}
	extKey, err := hdkeychain.NewMaster(seed, net)
	if err != nil {
		t.Errorf("NewMaster: unexpected error: %v", err)
		return
	}
	pubKey, err := extKey.Neuter()
	if err != nil {
		t.Errorf("Neuter: unexpected error: %v", err)
		return
	}

	// Deriving a hardened child extended key should fail from a public key.
	_, err = pubKey.Child(hdkeychain.HardenedKeyStart)
	if err != hdkeychain.ErrDeriveHardFromPublic {
		t.Errorf("Child: mismatched error -- got: %v, want: %v",
			err, hdkeychain.ErrDeriveHardFromPublic)
	}

	// NewKeyFromString failure tests.
	tests := []struct {
		name      string
		key       string
		err       error
		neuter    bool
		neuterErr error
	}{
		{
			name: "invalid key length",
			key:  "xpub1234",
			err:  hdkeychain.ErrInvalidKeyLen,
		},
		{
			name: "bad checksum",
			key:  "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EBygr15",
			err:  hdkeychain.ErrBadChecksum,
		},
		{
			name: "pubkey not on curve",
			key:  "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ1hr9Rwbk95YadvBkQXxzHBSngB8ndpW6QH7zhhsXZ2jHyZqPjk",
			err:  errors.New("pubkey isn't on secp256k1 curve"),
		},
		{
			name:      "unsupported version",
			key:       "xbad4LfUL9eKmA66w2GJdVMqhvDmYGJpTGjWRAtjHqoUY17sGaymoMV9Cm3ocn9Ud6Hh2vLFVC7KSKCRVVrqc6dsEdsTjRV1WUmkK85YEUujAPX",
			err:       nil,
			neuter:    true,
			neuterErr: chaincfg.ErrUnknownHDKeyID,
		},
	}

	for i, test := range tests {
		extKey, err := hdkeychain.NewKeyFromString(test.key)
		if !reflect.DeepEqual(err, test.err) {
			t.Errorf("NewKeyFromString #%d (%s): mismatched error "+
				"-- got: %v, want: %v", i, test.name, err,
				test.err)
			continue
		}

		if test.neuter {
			_, err := extKey.Neuter()
			if !reflect.DeepEqual(err, test.neuterErr) {
				t.Errorf("Neuter #%d (%s): mismatched error "+
					"-- got: %v, want: %v", i, test.name,
					err, test.neuterErr)
				continue
			}
		}
	}
}

// BenchmarkDeserialize benchmarks how long it takes to deserialize a private
// extended key.
func BenchmarkDeserialize(b *testing.B) {
	for i := 0; i < b.N; i++ {
		hdkeychain.NewKeyFromString(bip0032MasterPriv1)
	}
}

// UnmarshalJSON unmarshals the object from JSON. Part of json.Unmarshaller
// interface.
func (k *MasterKey) UnmarshalJSON(in []byte) error {
	var str string
	err := json.Unmarshal(in, &str)
	if err != nil {
		return err
	}

	key, err := hdkeychain.NewKeyFromString(str)
	if err != nil {
		return err
	}
	*k = MasterKey(*key)
	return nil
}

func createTestPubKeys(t *testing.T, number, offset int) []*hdkeychain.ExtendedKey {
	xpubRaw := "xpub661MyMwAqRbcFwdnYF5mvCBY54vaLdJf8c5ugJTp5p7PqF9J1USgBx12qYMnZ9yUiswV7smbQ1DSweMqu8wn7Jociz4PWkuJ6EPvoVEgMw7"
	xpubKey, err := hdkeychain.NewKeyFromString(xpubRaw)
	if err != nil {
		t.Fatalf("Failed to generate new key: %v", err)
	}

	keys := make([]*hdkeychain.ExtendedKey, number)
	for i := uint32(0); i < uint32(len(keys)); i++ {
		chPubKey, err := xpubKey.Child(i + uint32(offset))
		if err != nil {
			t.Fatalf("Failed to generate child key: %v", err)
		}
		keys[i] = chPubKey
	}
	return keys
}

// This example demonstrates the audits use case in BIP0032.
func Example_audits() {
	// The audits use case described in BIP0032 is:
	//
	// In case an auditor needs full access to the list of incoming and
	// outgoing payments, one can share all account public extended keys.
	// This will allow the auditor to see all transactions from and to the
	// wallet, in all accounts, but not a single secret key.
	//
	//   * N(m/*)
	//   corresponds to the neutered master extended key (also called
	//   the master public extended key)

	// Ordinarily this would either be read from some encrypted source
	// and be decrypted or generated as the NewMaster example shows, but
	// for the purposes of this example, the private extended key for the
	// master node is being hard coded here.
	master := "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jP" +
		"PqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi"

	// Start by getting an extended key instance for the master node.
	// This gives the path:
	//   m
	masterKey, err := hdkeychain.NewKeyFromString(master)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Neuter the master key to generate a master public extended key.  This
	// gives the path:
	//   N(m/*)
	masterPubKey, err := masterKey.Neuter()
	if err != nil {
		fmt.Println(err)
		return
	}

	// Share the master public extended key with the auditor.
	fmt.Println("Audit key N(m/*):", masterPubKey)

	// Output:
	// Audit key N(m/*): xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8
}

// Convert the given slice of strings into a slice of ExtendedKeys,
// checking that all of them are valid public (and not private) keys,
// and that there are no duplicates.
func convertAndValidatePubKeys(rawPubKeys []string) ([]*hdkeychain.ExtendedKey, error) {
	seenKeys := make(map[string]bool)
	keys := make([]*hdkeychain.ExtendedKey, len(rawPubKeys))
	for i, rawPubKey := range rawPubKeys {
		if _, seen := seenKeys[rawPubKey]; seen {
			str := fmt.Sprintf("duplicated public key: %v", rawPubKey)
			return nil, newError(ErrKeyDuplicate, str, nil)
		}
		seenKeys[rawPubKey] = true

		key, err := hdkeychain.NewKeyFromString(rawPubKey)
		if err != nil {
			str := fmt.Sprintf("invalid extended public key %v", rawPubKey)
			return nil, newError(ErrKeyChain, str, err)
		}

		if key.IsPrivate() {
			str := fmt.Sprintf("private keys not accepted: %v", rawPubKey)
			return nil, newError(ErrKeyIsPrivate, str, nil)
		}
		keys[i] = key
	}
	return keys, nil
}

//.........這裏部分代碼省略.........
		serializedKey := key.String()
		if serializedKey != wantKey {
			t.Errorf("String #%d (%s): mismatched serialized key "+
				"-- want %s, got %s", i, testName, wantKey,
				serializedKey)
			return false
		}

		wantErr := hdkeychain.ErrNotPrivExtKey
		_, err := key.ECPrivKey()
		if !reflect.DeepEqual(err, wantErr) {
			t.Errorf("ECPrivKey #%d (%s): mismatched error: want "+
				"%v, got %v", i, testName, wantErr, err)
			return false
		}

		wantErr = errors.New("pubkey string is empty")
		_, err = key.ECPubKey()
		if !reflect.DeepEqual(err, wantErr) {
			t.Errorf("ECPubKey #%d (%s): mismatched error: want "+
				"%v, got %v", i, testName, wantErr, err)
			return false
		}

		wantAddr := "1HT7xU2Ngenf7D4yocz2SAcnNLW7rK8d4E"
		addr, err := key.Address(&chaincfg.MainNetParams)
		if err != nil {
			t.Errorf("Addres s #%d (%s): unexpected error: %v", i,
				testName, err)
			return false
		}
		if addr.EncodeAddress() != wantAddr {
			t.Errorf("Address #%d (%s): mismatched address -- want "+
				"%s, got %s", i, testName, wantAddr,
				addr.EncodeAddress())
			return false
		}

		return true
	}

	for i, test := range tests {
		// Create new key from seed and get the neutered version.
		masterSeed, err := hex.DecodeString(test.master)
		if err != nil {
			t.Errorf("DecodeString #%d (%s): unexpected error: %v",
				i, test.name, err)
			continue
		}
		key, err := hdkeychain.NewMaster(masterSeed, test.net)
		if err != nil {
			t.Errorf("NewMaster #%d (%s): unexpected error when "+
				"creating new master key: %v", i, test.name,
				err)
			continue
		}
		neuteredKey, err := key.Neuter()
		if err != nil {
			t.Errorf("Neuter #%d (%s): unexpected error: %v", i,
				test.name, err)
			continue
		}

		// Ensure both non-neutered and neutered keys are zeroed
		// properly.
		key.Zero()
		if !testZeroed(i, test.name+" from seed not neutered", key) {
			continue
		}
		neuteredKey.Zero()
		if !testZeroed(i, test.name+" from seed neutered", key) {
			continue
		}

		// Deserialize key and get the neutered version.
		key, err = hdkeychain.NewKeyFromString(test.extKey)
		if err != nil {
			t.Errorf("NewKeyFromString #%d (%s): unexpected "+
				"error: %v", i, test.name, err)
			continue
		}
		neuteredKey, err = key.Neuter()
		if err != nil {
			t.Errorf("Neuter #%d (%s): unexpected error: %v", i,
				test.name, err)
			continue
		}

		// Ensure both non-neutered and neutered keys are zeroed
		// properly.
		key.Zero()
		if !testZeroed(i, test.name+" deserialized not neutered", key) {
			continue
		}
		neuteredKey.Zero()
		if !testZeroed(i, test.name+" deserialized neutered", key) {
			continue
		}
	}
}

// TestNet ensures the network related APIs work as intended.
func TestNet(t *testing.T) {
	tests := []struct {
		name      string
		key       string
		origNet   *chaincfg.Params
		newNet    *chaincfg.Params
		newPriv   string
		newPub    string
		isPrivate bool
	}{
		// Private extended keys.
		{
			name:      "mainnet -> simnet",
			key:       "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi",
			origNet:   &chaincfg.MainNetParams,
			newNet:    &chaincfg.SimNetParams,
			newPriv:   "sprv8Erh3X3hFeKunvVdAGQQtambRPapECWiTDtvsTGdyrhzhbYgnSZajRRWbihzvq4AM4ivm6uso31VfKaukwJJUs3GYihXP8ebhMb3F2AHu3P",
			newPub:    "spub4Tr3T2ab61tD1Qa6GHwRFiiKyRRJdfEZpSpXfqgFYCEyaPsqKysqHDjzSzMJSiUEGbcsG3w2SLMoTqn44B8x6u3MLRRkYfACTUBnHK79THk",
			isPrivate: true,
		},
		{
			name:      "simnet -> mainnet",
			key:       "sprv8Erh3X3hFeKunvVdAGQQtambRPapECWiTDtvsTGdyrhzhbYgnSZajRRWbihzvq4AM4ivm6uso31VfKaukwJJUs3GYihXP8ebhMb3F2AHu3P",
			origNet:   &chaincfg.SimNetParams,
			newNet:    &chaincfg.MainNetParams,
			newPriv:   "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi",
			newPub:    "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8",
			isPrivate: true,
		},
		{
			name:      "mainnet -> regtest",
			key:       "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi",
			origNet:   &chaincfg.MainNetParams,
			newNet:    &chaincfg.RegressionNetParams,
			newPriv:   "tprv8ZgxMBicQKsPeDgjzdC36fs6bMjGApWDNLR9erAXMs5skhMv36j9MV5ecvfavji5khqjWaWSFhN3YcCUUdiKH6isR4Pwy3U5y5egddBr16m",
			newPub:    "tpubD6NzVbkrYhZ4XgiXtGrdW5XDAPFCL9h7we1vwNCpn8tGbBcgfVYjXyhWo4E1xkh56hjod1RhGjxbaTLV3X4FyWuejifB9jusQ46QzG87VKp",
			isPrivate: true,
		},
		{
			name:      "regtest -> mainnet",
			key:       "tprv8ZgxMBicQKsPeDgjzdC36fs6bMjGApWDNLR9erAXMs5skhMv36j9MV5ecvfavji5khqjWaWSFhN3YcCUUdiKH6isR4Pwy3U5y5egddBr16m",
			origNet:   &chaincfg.RegressionNetParams,
			newNet:    &chaincfg.MainNetParams,
			newPriv:   "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi",
			newPub:    "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8",
			isPrivate: true,
		},

		// Public extended keys.
		{
			name:      "mainnet -> simnet",
			key:       "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8",
			origNet:   &chaincfg.MainNetParams,
			newNet:    &chaincfg.SimNetParams,
			newPub:    "spub4Tr3T2ab61tD1Qa6GHwRFiiKyRRJdfEZpSpXfqgFYCEyaPsqKysqHDjzSzMJSiUEGbcsG3w2SLMoTqn44B8x6u3MLRRkYfACTUBnHK79THk",
			isPrivate: false,
		},
		{
			name:      "simnet -> mainnet",
			key:       "spub4Tr3T2ab61tD1Qa6GHwRFiiKyRRJdfEZpSpXfqgFYCEyaPsqKysqHDjzSzMJSiUEGbcsG3w2SLMoTqn44B8x6u3MLRRkYfACTUBnHK79THk",
			origNet:   &chaincfg.SimNetParams,
			newNet:    &chaincfg.MainNetParams,
			newPub:    "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8",
			isPrivate: false,
		},
		{
			name:      "mainnet -> regtest",
			key:       "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8",
			origNet:   &chaincfg.MainNetParams,
			newNet:    &chaincfg.RegressionNetParams,
			newPub:    "tpubD6NzVbkrYhZ4XgiXtGrdW5XDAPFCL9h7we1vwNCpn8tGbBcgfVYjXyhWo4E1xkh56hjod1RhGjxbaTLV3X4FyWuejifB9jusQ46QzG87VKp",
			isPrivate: false,
		},
		{
			name:      "regtest -> mainnet",
			key:       "tpubD6NzVbkrYhZ4XgiXtGrdW5XDAPFCL9h7we1vwNCpn8tGbBcgfVYjXyhWo4E1xkh56hjod1RhGjxbaTLV3X4FyWuejifB9jusQ46QzG87VKp",
			origNet:   &chaincfg.RegressionNetParams,
			newNet:    &chaincfg.MainNetParams,
			newPub:    "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8",
			isPrivate: false,
		},
	}

	for i, test := range tests {
		extKey, err := hdkeychain.NewKeyFromString(test.key)
		if err != nil {
			t.Errorf("NewKeyFromString #%d (%s): unexpected error "+
				"creating extended key: %v", i, test.name,
				err)
			continue
		}

		if !extKey.IsForNet(test.origNet) {
			t.Errorf("IsForNet #%d (%s): key is not for expected "+
				"network %v", i, test.name, test.origNet.Name)
			continue
		}

		extKey.SetNet(test.newNet)
//.........這裏部分代碼省略.........

// TestExtendedKeyAPI ensures the API on the ExtendedKey type works as intended.
func TestExtendedKeyAPI(t *testing.T) {
	tests := []struct {
		name       string
		extKey     string
		isPrivate  bool
		parentFP   uint32
		privKey    string
		privKeyErr error
		pubKey     string
		address    string
	}{
		{
			name:      "test vector 1 master node private",
			extKey:    "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi",
			isPrivate: true,
			parentFP:  0,
			privKey:   "e8f32e723decf4051aefac8e2c93c9c5b214313817cdb01a1494b917c8436b35",
			pubKey:    "0339a36013301597daef41fbe593a02cc513d0b55527ec2df1050e2e8ff49c85c2",
			address:   "15mKKb2eos1hWa6tisdPwwDC1a5J1y9nma",
		},
		{
			name:       "test vector 1 chain m/0H/1/2H public",
			extKey:     "xpub6D4BDPcP2GT577Vvch3R8wDkScZWzQzMMUm3PWbmWvVJrZwQY4VUNgqFJPMM3No2dFDFGTsxxpG5uJh7n7epu4trkrX7x7DogT5Uv6fcLW5",
			isPrivate:  false,
			parentFP:   3203769081,
			privKeyErr: hdkeychain.ErrNotPrivExtKey,
			pubKey:     "0357bfe1e341d01c69fe5654309956cbea516822fba8a601743a012a7896ee8dc2",
			address:    "1NjxqbA9aZWnh17q1UW3rB4EPu79wDXj7x",
		},
	}

	for i, test := range tests {
		key, err := hdkeychain.NewKeyFromString(test.extKey)
		if err != nil {
			t.Errorf("NewKeyFromString #%d (%s): unexpected "+
				"error: %v", i, test.name, err)
			continue
		}

		if key.IsPrivate() != test.isPrivate {
			t.Errorf("IsPrivate #%d (%s): mismatched key type -- "+
				"want private %v, got private %v", i, test.name,
				test.isPrivate, key.IsPrivate())
			continue
		}

		parentFP := key.ParentFingerprint()
		if parentFP != test.parentFP {
			t.Errorf("ParentFingerprint #%d (%s): mismatched "+
				"parent fingerprint -- want %d, got %d", i,
				test.name, test.parentFP, parentFP)
			continue
		}

		serializedKey := key.String()
		if serializedKey != test.extKey {
			t.Errorf("String #%d (%s): mismatched serialized key "+
				"-- want %s, got %s", i, test.name, test.extKey,
				serializedKey)
			continue
		}

		privKey, err := key.ECPrivKey()
		if !reflect.DeepEqual(err, test.privKeyErr) {
			t.Errorf("ECPrivKey #%d (%s): mismatched error: want "+
				"%v, got %v", i, test.name, test.privKeyErr, err)
			continue
		}
		if test.privKeyErr == nil {
			privKeyStr := hex.EncodeToString(privKey.Serialize())
			if privKeyStr != test.privKey {
				t.Errorf("ECPrivKey #%d (%s): mismatched "+
					"private key -- want %s, got %s", i,
					test.name, test.privKey, privKeyStr)
				continue
			}
		}

		pubKey, err := key.ECPubKey()
		if err != nil {
			t.Errorf("ECPubKey #%d (%s): unexpected error: %v", i,
				test.name, err)
			continue
		}
		pubKeyStr := hex.EncodeToString(pubKey.SerializeCompressed())
		if pubKeyStr != test.pubKey {
			t.Errorf("ECPubKey #%d (%s): mismatched public key -- "+
				"want %s, got %s", i, test.name, test.pubKey,
				pubKeyStr)
			continue
		}

		addr, err := key.Address(&chaincfg.MainNetParams)
		if err != nil {
			t.Errorf("Address #%d (%s): unexpected error: %v", i,
				test.name, err)
			continue
		}
		if addr.EncodeAddress() != test.address {
//.........這裏部分代碼省略.........

// TestPublicDerivation tests several vectors which derive public keys from
// other public keys works as intended.
func TestPublicDerivation(t *testing.T) {
	// The public extended keys for test vectors in [BIP32].
	testVec1MasterPubKey := "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8"
	testVec2MasterPubKey := "xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB"

	tests := []struct {
		name    string
		master  string
		path    []uint32
		wantPub string
	}{
		// Test vector 1
		{
			name:    "test vector 1 chain m",
			master:  testVec1MasterPubKey,
			path:    []uint32{},
			wantPub: "xpub661MyMwAqRbcFtXgS5sYJABqqG9YLmC4Q1Rdap9gSE8NqtwybGhePY2gZ29ESFjqJoCu1Rupje8YtGqsefD265TMg7usUDFdp6W1EGMcet8",
		},
		{
			name:    "test vector 1 chain m/0",
			master:  testVec1MasterPubKey,
			path:    []uint32{0},
			wantPub: "xpub68Gmy5EVb2BdFbj2LpWrk1M7obNuaPTpT5oh9QCCo5sRfqSHVYWex97WpDZzszdzHzxXDAzPLVSwybe4uPYkSk4G3gnrPqqkV9RyNzAcNJ1",
		},
		{
			name:    "test vector 1 chain m/0/1",
			master:  testVec1MasterPubKey,
			path:    []uint32{0, 1},
			wantPub: "xpub6AvUGrnEpfvJBbfx7sQ89Q8hEMPM65UteqEX4yUbUiES2jHfjexmfJoxCGSwFMZiPBaKQT1RiKWrKfuDV4vpgVs4Xn8PpPTR2i79rwHd4Zr",
		},
		{
			name:    "test vector 1 chain m/0/1/2",
			master:  testVec1MasterPubKey,
			path:    []uint32{0, 1, 2},
			wantPub: "xpub6BqyndF6rhZqmgktFCBcapkwubGxPqoAZtQaYewJHXVKZcLdnqBVC8N6f6FSHWUghjuTLeubWyQWfJdk2G3tGgvgj3qngo4vLTnnSjAZckv",
		},
		{
			name:    "test vector 1 chain m/0/1/2/2",
			master:  testVec1MasterPubKey,
			path:    []uint32{0, 1, 2, 2},
			wantPub: "xpub6FHUhLbYYkgFQiFrDiXRfQFXBB2msCxKTsNyAExi6keFxQ8sHfwpogY3p3s1ePSpUqLNYks5T6a3JqpCGszt4kxbyq7tUoFP5c8KWyiDtPp",
		},
		{
			name:    "test vector 1 chain m/0/1/2/2/1000000000",
			master:  testVec1MasterPubKey,
			path:    []uint32{0, 1, 2, 2, 1000000000},
			wantPub: "xpub6GX3zWVgSgPc5tgjE6ogT9nfwSADD3tdsxpzd7jJoJMqSY12Be6VQEFwDCp6wAQoZsH2iq5nNocHEaVDxBcobPrkZCjYW3QUmoDYzMFBDu9",
		},

		// Test vector 2
		{
			name:    "test vector 2 chain m",
			master:  testVec2MasterPubKey,
			path:    []uint32{},
			wantPub: "xpub661MyMwAqRbcFW31YEwpkMuc5THy2PSt5bDMsktWQcFF8syAmRUapSCGu8ED9W6oDMSgv6Zz8idoc4a6mr8BDzTJY47LJhkJ8UB7WEGuduB",
		},
		{
			name:    "test vector 2 chain m/0",
			master:  testVec2MasterPubKey,
			path:    []uint32{0},
			wantPub: "xpub69H7F5d8KSRgmmdJg2KhpAK8SR3DjMwAdkxj3ZuxV27CprR9LgpeyGmXUbC6wb7ERfvrnKZjXoUmmDznezpbZb7ap6r1D3tgFxHmwMkQTPH",
		},
		{
			name:    "test vector 2 chain m/0/2147483647",
			master:  testVec2MasterPubKey,
			path:    []uint32{0, 2147483647},
			wantPub: "xpub6ASAVgeWMg4pmutghzHG3BohahjwNwPmy2DgM6W9wGegtPrvNgjBwuZRD7hSDFhYfunq8vDgwG4ah1gVzZysgp3UsKz7VNjCnSUJJ5T4fdD",
		},
		{
			name:    "test vector 2 chain m/0/2147483647/1",
			master:  testVec2MasterPubKey,
			path:    []uint32{0, 2147483647, 1},
			wantPub: "xpub6CrnV7NzJy4VdgP5niTpqWJiFXMAca6qBm5Hfsry77SQmN1HGYHnjsZSujoHzdxf7ZNK5UVrmDXFPiEW2ecwHGWMFGUxPC9ARipss9rXd4b",
		},
		{
			name:    "test vector 2 chain m/0/2147483647/1/2147483646",
			master:  testVec2MasterPubKey,
			path:    []uint32{0, 2147483647, 1, 2147483646},
			wantPub: "xpub6FL2423qFaWzHCvBndkN9cbkn5cysiUeFq4eb9t9kE88jcmY63tNuLNRzpHPdAM4dUpLhZ7aUm2cJ5zF7KYonf4jAPfRqTMTRBNkQL3Tfta",
		},
		{
			name:    "test vector 2 chain m/0/2147483647/1/2147483646/2",
			master:  testVec2MasterPubKey,
			path:    []uint32{0, 2147483647, 1, 2147483646, 2},
			wantPub: "xpub6H7WkJf547AiSwAbX6xsm8Bmq9M9P1Gjequ5SipsjipWmtXSyp4C3uwzewedGEgAMsDy4jEvNTWtxLyqqHY9C12gaBmgUdk2CGmwachwnWK",
		},
	}

tests:
	for i, test := range tests {
		extKey, err := hdkeychain.NewKeyFromString(test.master)
		if err != nil {
			t.Errorf("NewKeyFromString #%d (%s): unexpected error "+
				"creating extended key: %v", i, test.name,
				err)
			continue
		}

//.........這裏部分代碼省略.........

// This example demonstrates the default hierarchical deterministic wallet
// layout as described in BIP0032.
func Example_defaultWalletLayout() {
	// The default wallet layout described in BIP0032 is:
	//
	// Each account is composed of two keypair chains: an internal and an
	// external one. The external keychain is used to generate new public
	// addresses, while the internal keychain is used for all other
	// operations (change addresses, generation addresses, ..., anything
	// that doesn't need to be communicated).
	//
	//   * m/iH/0/k
	//     corresponds to the k'th keypair of the external chain of account
	//     number i of the HDW derived from master m.
	//   * m/iH/1/k
	//     corresponds to the k'th keypair of the internal chain of account
	//     number i of the HDW derived from master m.

	// Ordinarily this would either be read from some encrypted source
	// and be decrypted or generated as the NewMaster example shows, but
	// for the purposes of this example, the private extended key for the
	// master node is being hard coded here.
	master := "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jP" +
		"PqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi"

	// Start by getting an extended key instance for the master node.
	// This gives the path:
	//   m
	masterKey, err := hdkeychain.NewKeyFromString(master)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Derive the extended key for account 0.  This gives the path:
	//   m/0H
	acct0, err := masterKey.Child(hdkeychain.HardenedKeyStart + 0)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Derive the extended key for the account 0 external chain.  This
	// gives the path:
	//   m/0H/0
	acct0Ext, err := acct0.Child(0)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Derive the extended key for the account 0 internal chain.  This gives
	// the path:
	//   m/0H/1
	acct0Int, err := acct0.Child(1)
	if err != nil {
		fmt.Println(err)
		return
	}

	// At this point, acct0Ext and acct0Int are ready to derive the keys for
	// the external and internal wallet chains.

	// Derive the 10th extended key for the account 0 external chain.  This
	// gives the path:
	//   m/0H/0/10
	acct0Ext10, err := acct0Ext.Child(10)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Derive the 1st extended key for the account 0 internal chain.  This
	// gives the path:
	//   m/0H/1/0
	acct0Int0, err := acct0Int.Child(0)
	if err != nil {
		fmt.Println(err)
		return
	}

	// Get and show the address associated with the extended keys for the
	// main bitcoin	network.
	acct0ExtAddr, err := acct0Ext10.Address(&chaincfg.MainNetParams)
	if err != nil {
		fmt.Println(err)
		return
	}
	acct0IntAddr, err := acct0Int0.Address(&chaincfg.MainNetParams)
	if err != nil {
		fmt.Println(err)
		return
	}
	fmt.Println("Account 0 External Address 10:", acct0ExtAddr)
	fmt.Println("Account 0 Internal Address 0:", acct0IntAddr)

	// Output:
	// Account 0 External Address 10: 1HVccubUT8iKTapMJ5AnNA4sLRN27xzQ4F
	// Account 0 Internal Address 0: 1J5rebbkQaunJTUoNVREDbeB49DqMNFFXk
}