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Manu Herrera
2019-10-01 12:22:30 -03:00
parent 41e6aad190
commit d301c63596
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hdkeychain
==========
[![Build Status](http://img.shields.io/travis/btcsuite/btcutil.svg)](https://travis-ci.org/btcsuite/btcutil)
[![ISC License](http://img.shields.io/badge/license-ISC-blue.svg)](http://copyfree.org)
[![GoDoc](http://img.shields.io/badge/godoc-reference-blue.svg)](http://godoc.org/github.com/btcsuite/btcutil/hdkeychain)
Package hdkeychain provides an API for bitcoin hierarchical deterministic
extended keys (BIP0032).
A comprehensive suite of tests is provided to ensure proper functionality. See
`test_coverage.txt` for the gocov coverage report. Alternatively, if you are
running a POSIX OS, you can run the `cov_report.sh` script for a real-time
report.
## Feature Overview
- Full BIP0032 implementation
- Single type for private and public extended keys
- Convenient cryptograpically secure seed generation
- Simple creation of master nodes
- Support for multi-layer derivation
- Easy serialization and deserialization for both private and public extended
keys
- Support for custom networks by registering them with chaincfg
- Obtaining the underlying EC pubkeys, EC privkeys, and associated bitcoin
addresses ties in seamlessly with existing btcec and btcutil types which
provide powerful tools for working with them to do things like sign
transations and generate payment scripts
- Uses the btcec package which is highly optimized for secp256k1
- Code examples including:
- Generating a cryptographically secure random seed and deriving a
master node from it
- Default HD wallet layout as described by BIP0032
- Audits use case as described by BIP0032
- Comprehensive test coverage including the BIP0032 test vectors
- Benchmarks
## Installation and Updating
```bash
$ go get -u github.com/btcsuite/btcutil/hdkeychain
```
## Examples
* [NewMaster Example](http://godoc.org/github.com/btcsuite/btcutil/hdkeychain#example-NewMaster)
Demonstrates how to generate a cryptographically random seed then use it to
create a new master node (extended key).
* [Default Wallet Layout Example](http://godoc.org/github.com/btcsuite/btcutil/hdkeychain#example-package--DefaultWalletLayout)
Demonstrates the default hierarchical deterministic wallet layout as described
in BIP0032.
* [Audits Use Case Example](http://godoc.org/github.com/btcsuite/btcutil/hdkeychain#example-package--Audits)
Demonstrates the audits use case in BIP0032.
## License
Package hdkeychain is licensed under the [copyfree](http://copyfree.org) ISC
License.

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#!/bin/sh
# This script uses gocov to generate a test coverage report.
# The gocov tool my be obtained with the following command:
# go get github.com/axw/gocov/gocov
#
# It will be installed to $GOPATH/bin, so ensure that location is in your $PATH.
# Check for gocov.
type gocov >/dev/null 2>&1
if [ $? -ne 0 ]; then
echo >&2 "This script requires the gocov tool."
echo >&2 "You may obtain it with the following command:"
echo >&2 "go get github.com/axw/gocov/gocov"
exit 1
fi
gocov test | gocov report

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// Copyright (c) 2014 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
/*
Package hdkeychain provides an API for bitcoin hierarchical deterministic
extended keys (BIP0032).
Overview
The ability to implement hierarchical deterministic wallets depends on the
ability to create and derive hierarchical deterministic extended keys.
At a high level, this package provides support for those hierarchical
deterministic extended keys by providing an ExtendedKey type and supporting
functions. Each extended key can either be a private or public extended key
which itself is capable of deriving a child extended key.
Determining the Extended Key Type
Whether an extended key is a private or public extended key can be determined
with the IsPrivate function.
Transaction Signing Keys and Payment Addresses
In order to create and sign transactions, or provide others with addresses to
send funds to, the underlying key and address material must be accessible. This
package provides the ECPubKey, ECPrivKey, and Address functions for this
purpose.
The Master Node
As previously mentioned, the extended keys are hierarchical meaning they are
used to form a tree. The root of that tree is called the master node and this
package provides the NewMaster function to create it from a cryptographically
random seed. The GenerateSeed function is provided as a convenient way to
create a random seed for use with the NewMaster function.
Deriving Children
Once you have created a tree root (or have deserialized an extended key as
discussed later), the child extended keys can be derived by using the Child
function. The Child function supports deriving both normal (non-hardened) and
hardened child extended keys. In order to derive a hardened extended key, use
the HardenedKeyStart constant + the hardened key number as the index to the
Child function. This provides the ability to cascade the keys into a tree and
hence generate the hierarchical deterministic key chains.
Normal vs Hardened Child Extended Keys
A private extended key can be used to derive both hardened and non-hardened
(normal) child private and public extended keys. A public extended key can only
be used to derive non-hardened child public extended keys. As enumerated in
BIP0032 "knowledge of the extended public key plus any non-hardened private key
descending from it is equivalent to knowing the extended private key (and thus
every private and public key descending from it). This means that extended
public keys must be treated more carefully than regular public keys. It is also
the reason for the existence of hardened keys, and why they are used for the
account level in the tree. This way, a leak of an account-specific (or below)
private key never risks compromising the master or other accounts."
Neutering a Private Extended Key
A private extended key can be converted to a new instance of the corresponding
public extended key with the Neuter function. The original extended key is not
modified. A public extended key is still capable of deriving non-hardened child
public extended keys.
Serializing and Deserializing Extended Keys
Extended keys are serialized and deserialized with the String and
NewKeyFromString functions. The serialized key is a Base58-encoded string which
looks like the following:
public key: xpub68Gmy5EdvgibQVfPdqkBBCHxA5htiqg55crXYuXoQRKfDBFA1WEjWgP6LHhwBZeNK1VTsfTFUHCdrfp1bgwQ9xv5ski8PX9rL2dZXvgGDnw
private key: xprv9uHRZZhk6KAJC1avXpDAp4MDc3sQKNxDiPvvkX8Br5ngLNv1TxvUxt4cV1rGL5hj6KCesnDYUhd7oWgT11eZG7XnxHrnYeSvkzY7d2bhkJ7
Network
Extended keys are much like normal Bitcoin addresses in that they have version
bytes which tie them to a specific network. The SetNet and IsForNet functions
are provided to set and determinine which network an extended key is associated
with.
*/
package hdkeychain

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// Copyright (c) 2014-2016 The btcsuite developers
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.
package hdkeychain
// References:
// [BIP32]: BIP0032 - Hierarchical Deterministic Wallets
// https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki
import (
"bytes"
"crypto/hmac"
"crypto/rand"
"crypto/sha512"
"encoding/binary"
"errors"
"fmt"
"math/big"
"github.com/btcsuite/btcd/btcec"
"github.com/btcsuite/btcd/chaincfg"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcutil"
"github.com/btcsuite/btcutil/base58"
)
const (
// RecommendedSeedLen is the recommended length in bytes for a seed
// to a master node.
RecommendedSeedLen = 32 // 256 bits
// HardenedKeyStart is the index at which a hardended key starts. Each
// extended key has 2^31 normal child keys and 2^31 hardned child keys.
// Thus the range for normal child keys is [0, 2^31 - 1] and the range
// for hardened child keys is [2^31, 2^32 - 1].
HardenedKeyStart = 0x80000000 // 2^31
// MinSeedBytes is the minimum number of bytes allowed for a seed to
// a master node.
MinSeedBytes = 16 // 128 bits
// MaxSeedBytes is the maximum number of bytes allowed for a seed to
// a master node.
MaxSeedBytes = 64 // 512 bits
// serializedKeyLen is the length of a serialized public or private
// extended key. It consists of 4 bytes version, 1 byte depth, 4 bytes
// fingerprint, 4 bytes child number, 32 bytes chain code, and 33 bytes
// public/private key data.
serializedKeyLen = 4 + 1 + 4 + 4 + 32 + 33 // 78 bytes
// maxUint8 is the max positive integer which can be serialized in a uint8
maxUint8 = 1<<8 - 1
)
var (
// ErrDeriveHardFromPublic describes an error in which the caller
// attempted to derive a hardened extended key from a public key.
ErrDeriveHardFromPublic = errors.New("cannot derive a hardened key " +
"from a public key")
// ErrDeriveBeyondMaxDepth describes an error in which the caller
// has attempted to derive more than 255 keys from a root key.
ErrDeriveBeyondMaxDepth = errors.New("cannot derive a key with more than " +
"255 indices in its path")
// ErrNotPrivExtKey describes an error in which the caller attempted
// to extract a private key from a public extended key.
ErrNotPrivExtKey = errors.New("unable to create private keys from a " +
"public extended key")
// ErrInvalidChild describes an error in which the child at a specific
// index is invalid due to the derived key falling outside of the valid
// range for secp256k1 private keys. This error indicates the caller
// should simply ignore the invalid child extended key at this index and
// increment to the next index.
ErrInvalidChild = errors.New("the extended key at this index is invalid")
// ErrUnusableSeed describes an error in which the provided seed is not
// usable due to the derived key falling outside of the valid range for
// secp256k1 private keys. This error indicates the caller must choose
// another seed.
ErrUnusableSeed = errors.New("unusable seed")
// ErrInvalidSeedLen describes an error in which the provided seed or
// seed length is not in the allowed range.
ErrInvalidSeedLen = fmt.Errorf("seed length must be between %d and %d "+
"bits", MinSeedBytes*8, MaxSeedBytes*8)
// ErrBadChecksum describes an error in which the checksum encoded with
// a serialized extended key does not match the calculated value.
ErrBadChecksum = errors.New("bad extended key checksum")
// ErrInvalidKeyLen describes an error in which the provided serialized
// key is not the expected length.
ErrInvalidKeyLen = errors.New("the provided serialized extended key " +
"length is invalid")
)
// masterKey is the master key used along with a random seed used to generate
// the master node in the hierarchical tree.
var masterKey = []byte("Bitcoin seed")
// ExtendedKey houses all the information needed to support a hierarchical
// deterministic extended key. See the package overview documentation for
// more details on how to use extended keys.
type ExtendedKey struct {
key []byte // This will be the pubkey for extended pub keys
pubKey []byte // This will only be set for extended priv keys
chainCode []byte
depth uint8
parentFP []byte
childNum uint32
version []byte
isPrivate bool
}
// NewExtendedKey returns a new instance of an extended key with the given
// fields. No error checking is performed here as it's only intended to be a
// convenience method used to create a populated struct. This function should
// only by used by applications that need to create custom ExtendedKeys. All
// other applications should just use NewMaster, Child, or Neuter.
func NewExtendedKey(version, key, chainCode, parentFP []byte, depth uint8,
childNum uint32, isPrivate bool) *ExtendedKey {
// NOTE: The pubKey field is intentionally left nil so it is only
// computed and memoized as required.
return &ExtendedKey{
key: key,
chainCode: chainCode,
depth: depth,
parentFP: parentFP,
childNum: childNum,
version: version,
isPrivate: isPrivate,
}
}
// pubKeyBytes returns bytes for the serialized compressed public key associated
// with this extended key in an efficient manner including memoization as
// necessary.
//
// When the extended key is already a public key, the key is simply returned as
// is since it's already in the correct form. However, when the extended key is
// a private key, the public key will be calculated and memoized so future
// accesses can simply return the cached result.
func (k *ExtendedKey) pubKeyBytes() []byte {
// Just return the key if it's already an extended public key.
if !k.isPrivate {
return k.key
}
// This is a private extended key, so calculate and memoize the public
// key if needed.
if len(k.pubKey) == 0 {
pkx, pky := btcec.S256().ScalarBaseMult(k.key)
pubKey := btcec.PublicKey{Curve: btcec.S256(), X: pkx, Y: pky}
k.pubKey = pubKey.SerializeCompressed()
}
return k.pubKey
}
// IsPrivate returns whether or not the extended key is a private extended key.
//
// A private extended key can be used to derive both hardened and non-hardened
// child private and public extended keys. A public extended key can only be
// used to derive non-hardened child public extended keys.
func (k *ExtendedKey) IsPrivate() bool {
return k.isPrivate
}
// Depth returns the current derivation level with respect to the root.
//
// The root key has depth zero, and the field has a maximum of 255 due to
// how depth is serialized.
func (k *ExtendedKey) Depth() uint8 {
return k.depth
}
// ParentFingerprint returns a fingerprint of the parent extended key from which
// this one was derived.
func (k *ExtendedKey) ParentFingerprint() uint32 {
return binary.BigEndian.Uint32(k.parentFP)
}
// Child returns a derived child extended key at the given index. When this
// extended key is a private extended key (as determined by the IsPrivate
// function), a private extended key will be derived. Otherwise, the derived
// extended key will be also be a public extended key.
//
// When the index is greater to or equal than the HardenedKeyStart constant, the
// derived extended key will be a hardened extended key. It is only possible to
// derive a hardended extended key from a private extended key. Consequently,
// this function will return ErrDeriveHardFromPublic if a hardened child
// extended key is requested from a public extended key.
//
// A hardened extended key is useful since, as previously mentioned, it requires
// a parent private extended key to derive. In other words, normal child
// extended public keys can be derived from a parent public extended key (no
// knowledge of the parent private key) whereas hardened extended keys may not
// be.
//
// NOTE: There is an extremely small chance (< 1 in 2^127) the specific child
// index does not derive to a usable child. The ErrInvalidChild error will be
// returned if this should occur, and the caller is expected to ignore the
// invalid child and simply increment to the next index.
func (k *ExtendedKey) Child(i uint32) (*ExtendedKey, error) {
// Prevent derivation of children beyond the max allowed depth.
if k.depth == maxUint8 {
return nil, ErrDeriveBeyondMaxDepth
}
// There are four scenarios that could happen here:
// 1) Private extended key -> Hardened child private extended key
// 2) Private extended key -> Non-hardened child private extended key
// 3) Public extended key -> Non-hardened child public extended key
// 4) Public extended key -> Hardened child public extended key (INVALID!)
// Case #4 is invalid, so error out early.
// A hardened child extended key may not be created from a public
// extended key.
isChildHardened := i >= HardenedKeyStart
if !k.isPrivate && isChildHardened {
return nil, ErrDeriveHardFromPublic
}
// The data used to derive the child key depends on whether or not the
// child is hardened per [BIP32].
//
// For hardened children:
// 0x00 || ser256(parentKey) || ser32(i)
//
// For normal children:
// serP(parentPubKey) || ser32(i)
keyLen := 33
data := make([]byte, keyLen+4)
if isChildHardened {
// Case #1.
// When the child is a hardened child, the key is known to be a
// private key due to the above early return. Pad it with a
// leading zero as required by [BIP32] for deriving the child.
copy(data[1:], k.key)
} else {
// Case #2 or #3.
// This is either a public or private extended key, but in
// either case, the data which is used to derive the child key
// starts with the secp256k1 compressed public key bytes.
copy(data, k.pubKeyBytes())
}
binary.BigEndian.PutUint32(data[keyLen:], i)
// Take the HMAC-SHA512 of the current key's chain code and the derived
// data:
// I = HMAC-SHA512(Key = chainCode, Data = data)
hmac512 := hmac.New(sha512.New, k.chainCode)
hmac512.Write(data)
ilr := hmac512.Sum(nil)
// Split "I" into two 32-byte sequences Il and Ir where:
// Il = intermediate key used to derive the child
// Ir = child chain code
il := ilr[:len(ilr)/2]
childChainCode := ilr[len(ilr)/2:]
// Both derived public or private keys rely on treating the left 32-byte
// sequence calculated above (Il) as a 256-bit integer that must be
// within the valid range for a secp256k1 private key. There is a small
// chance (< 1 in 2^127) this condition will not hold, and in that case,
// a child extended key can't be created for this index and the caller
// should simply increment to the next index.
ilNum := new(big.Int).SetBytes(il)
if ilNum.Cmp(btcec.S256().N) >= 0 || ilNum.Sign() == 0 {
return nil, ErrInvalidChild
}
// The algorithm used to derive the child key depends on whether or not
// a private or public child is being derived.
//
// For private children:
// childKey = parse256(Il) + parentKey
//
// For public children:
// childKey = serP(point(parse256(Il)) + parentKey)
var isPrivate bool
var childKey []byte
if k.isPrivate {
// Case #1 or #2.
// Add the parent private key to the intermediate private key to
// derive the final child key.
//
// childKey = parse256(Il) + parenKey
keyNum := new(big.Int).SetBytes(k.key)
ilNum.Add(ilNum, keyNum)
ilNum.Mod(ilNum, btcec.S256().N)
childKey = ilNum.Bytes()
isPrivate = true
} else {
// Case #3.
// Calculate the corresponding intermediate public key for
// intermediate private key.
ilx, ily := btcec.S256().ScalarBaseMult(il)
if ilx.Sign() == 0 || ily.Sign() == 0 {
return nil, ErrInvalidChild
}
// Convert the serialized compressed parent public key into X
// and Y coordinates so it can be added to the intermediate
// public key.
pubKey, err := btcec.ParsePubKey(k.key, btcec.S256())
if err != nil {
return nil, err
}
// Add the intermediate public key to the parent public key to
// derive the final child key.
//
// childKey = serP(point(parse256(Il)) + parentKey)
childX, childY := btcec.S256().Add(ilx, ily, pubKey.X, pubKey.Y)
pk := btcec.PublicKey{Curve: btcec.S256(), X: childX, Y: childY}
childKey = pk.SerializeCompressed()
}
// The fingerprint of the parent for the derived child is the first 4
// bytes of the RIPEMD160(SHA256(parentPubKey)).
parentFP := btcutil.Hash160(k.pubKeyBytes())[:4]
return NewExtendedKey(k.version, childKey, childChainCode, parentFP,
k.depth+1, i, isPrivate), nil
}
// Neuter returns a new extended public key from this extended private key. The
// same extended key will be returned unaltered if it is already an extended
// public key.
//
// As the name implies, an extended public key does not have access to the
// private key, so it is not capable of signing transactions or deriving
// child extended private keys. However, it is capable of deriving further
// child extended public keys.
func (k *ExtendedKey) Neuter() (*ExtendedKey, error) {
// Already an extended public key.
if !k.isPrivate {
return k, nil
}
// Get the associated public extended key version bytes.
version, err := chaincfg.HDPrivateKeyToPublicKeyID(k.version)
if err != nil {
return nil, err
}
// Convert it to an extended public key. The key for the new extended
// key will simply be the pubkey of the current extended private key.
//
// This is the function N((k,c)) -> (K, c) from [BIP32].
return NewExtendedKey(version, k.pubKeyBytes(), k.chainCode, k.parentFP,
k.depth, k.childNum, false), nil
}
// ECPubKey converts the extended key to a btcec public key and returns it.
func (k *ExtendedKey) ECPubKey() (*btcec.PublicKey, error) {
return btcec.ParsePubKey(k.pubKeyBytes(), btcec.S256())
}
// ECPrivKey converts the extended key to a btcec private key and returns it.
// As you might imagine this is only possible if the extended key is a private
// extended key (as determined by the IsPrivate function). The ErrNotPrivExtKey
// error will be returned if this function is called on a public extended key.
func (k *ExtendedKey) ECPrivKey() (*btcec.PrivateKey, error) {
if !k.isPrivate {
return nil, ErrNotPrivExtKey
}
privKey, _ := btcec.PrivKeyFromBytes(btcec.S256(), k.key)
return privKey, nil
}
// Address converts the extended key to a standard bitcoin pay-to-pubkey-hash
// address for the passed network.
func (k *ExtendedKey) Address(net *chaincfg.Params) (*btcutil.AddressPubKeyHash, error) {
pkHash := btcutil.Hash160(k.pubKeyBytes())
return btcutil.NewAddressPubKeyHash(pkHash, net)
}
// paddedAppend appends the src byte slice to dst, returning the new slice.
// If the length of the source is smaller than the passed size, leading zero
// bytes are appended to the dst slice before appending src.
func paddedAppend(size uint, dst, src []byte) []byte {
for i := 0; i < int(size)-len(src); i++ {
dst = append(dst, 0)
}
return append(dst, src...)
}
// String returns the extended key as a human-readable base58-encoded string.
func (k *ExtendedKey) String() string {
if len(k.key) == 0 {
return "zeroed extended key"
}
var childNumBytes [4]byte
binary.BigEndian.PutUint32(childNumBytes[:], k.childNum)
// The serialized format is:
// version (4) || depth (1) || parent fingerprint (4)) ||
// child num (4) || chain code (32) || key data (33) || checksum (4)
serializedBytes := make([]byte, 0, serializedKeyLen+4)
serializedBytes = append(serializedBytes, k.version...)
serializedBytes = append(serializedBytes, k.depth)
serializedBytes = append(serializedBytes, k.parentFP...)
serializedBytes = append(serializedBytes, childNumBytes[:]...)
serializedBytes = append(serializedBytes, k.chainCode...)
if k.isPrivate {
serializedBytes = append(serializedBytes, 0x00)
serializedBytes = paddedAppend(32, serializedBytes, k.key)
} else {
serializedBytes = append(serializedBytes, k.pubKeyBytes()...)
}
checkSum := chainhash.DoubleHashB(serializedBytes)[:4]
serializedBytes = append(serializedBytes, checkSum...)
return base58.Encode(serializedBytes)
}
// IsForNet returns whether or not the extended key is associated with the
// passed bitcoin network.
func (k *ExtendedKey) IsForNet(net *chaincfg.Params) bool {
return bytes.Equal(k.version, net.HDPrivateKeyID[:]) ||
bytes.Equal(k.version, net.HDPublicKeyID[:])
}
// SetNet associates the extended key, and any child keys yet to be derived from
// it, with the passed network.
func (k *ExtendedKey) SetNet(net *chaincfg.Params) {
if k.isPrivate {
k.version = net.HDPrivateKeyID[:]
} else {
k.version = net.HDPublicKeyID[:]
}
}
// zero sets all bytes in the passed slice to zero. This is used to
// explicitly clear private key material from memory.
func zero(b []byte) {
lenb := len(b)
for i := 0; i < lenb; i++ {
b[i] = 0
}
}
// Zero manually clears all fields and bytes in the extended key. This can be
// used to explicitly clear key material from memory for enhanced security
// against memory scraping. This function only clears this particular key and
// not any children that have already been derived.
func (k *ExtendedKey) Zero() {
zero(k.key)
zero(k.pubKey)
zero(k.chainCode)
zero(k.parentFP)
k.version = nil
k.key = nil
k.depth = 0
k.childNum = 0
k.isPrivate = false
}
// NewMaster creates a new master node for use in creating a hierarchical
// deterministic key chain. The seed must be between 128 and 512 bits and
// should be generated by a cryptographically secure random generation source.
//
// NOTE: There is an extremely small chance (< 1 in 2^127) the provided seed
// will derive to an unusable secret key. The ErrUnusable error will be
// returned if this should occur, so the caller must check for it and generate a
// new seed accordingly.
func NewMaster(seed []byte, net *chaincfg.Params) (*ExtendedKey, error) {
// Per [BIP32], the seed must be in range [MinSeedBytes, MaxSeedBytes].
if len(seed) < MinSeedBytes || len(seed) > MaxSeedBytes {
return nil, ErrInvalidSeedLen
}
// First take the HMAC-SHA512 of the master key and the seed data:
// I = HMAC-SHA512(Key = "Bitcoin seed", Data = S)
hmac512 := hmac.New(sha512.New, masterKey)
hmac512.Write(seed)
lr := hmac512.Sum(nil)
// Split "I" into two 32-byte sequences Il and Ir where:
// Il = master secret key
// Ir = master chain code
secretKey := lr[:len(lr)/2]
chainCode := lr[len(lr)/2:]
// Ensure the key in usable.
secretKeyNum := new(big.Int).SetBytes(secretKey)
if secretKeyNum.Cmp(btcec.S256().N) >= 0 || secretKeyNum.Sign() == 0 {
return nil, ErrUnusableSeed
}
parentFP := []byte{0x00, 0x00, 0x00, 0x00}
return NewExtendedKey(net.HDPrivateKeyID[:], secretKey, chainCode,
parentFP, 0, 0, true), nil
}
// NewKeyFromString returns a new extended key instance from a base58-encoded
// extended key.
func NewKeyFromString(key string) (*ExtendedKey, error) {
// The base58-decoded extended key must consist of a serialized payload
// plus an additional 4 bytes for the checksum.
decoded := base58.Decode(key)
if len(decoded) != serializedKeyLen+4 {
return nil, ErrInvalidKeyLen
}
// The serialized format is:
// version (4) || depth (1) || parent fingerprint (4)) ||
// child num (4) || chain code (32) || key data (33) || checksum (4)
// Split the payload and checksum up and ensure the checksum matches.
payload := decoded[:len(decoded)-4]
checkSum := decoded[len(decoded)-4:]
expectedCheckSum := chainhash.DoubleHashB(payload)[:4]
if !bytes.Equal(checkSum, expectedCheckSum) {
return nil, ErrBadChecksum
}
// Deserialize each of the payload fields.
version := payload[:4]
depth := payload[4:5][0]
parentFP := payload[5:9]
childNum := binary.BigEndian.Uint32(payload[9:13])
chainCode := payload[13:45]
keyData := payload[45:78]
// The key data is a private key if it starts with 0x00. Serialized
// compressed pubkeys either start with 0x02 or 0x03.
isPrivate := keyData[0] == 0x00
if isPrivate {
// Ensure the private key is valid. It must be within the range
// of the order of the secp256k1 curve and not be 0.
keyData = keyData[1:]
keyNum := new(big.Int).SetBytes(keyData)
if keyNum.Cmp(btcec.S256().N) >= 0 || keyNum.Sign() == 0 {
return nil, ErrUnusableSeed
}
} else {
// Ensure the public key parses correctly and is actually on the
// secp256k1 curve.
_, err := btcec.ParsePubKey(keyData, btcec.S256())
if err != nil {
return nil, err
}
}
return NewExtendedKey(version, keyData, chainCode, parentFP, depth,
childNum, isPrivate), nil
}
// GenerateSeed returns a cryptographically secure random seed that can be used
// as the input for the NewMaster function to generate a new master node.
//
// The length is in bytes and it must be between 16 and 64 (128 to 512 bits).
// The recommended length is 32 (256 bits) as defined by the RecommendedSeedLen
// constant.
func GenerateSeed(length uint8) ([]byte, error) {
// Per [BIP32], the seed must be in range [MinSeedBytes, MaxSeedBytes].
if length < MinSeedBytes || length > MaxSeedBytes {
return nil, ErrInvalidSeedLen
}
buf := make([]byte, length)
_, err := rand.Read(buf)
if err != nil {
return nil, err
}
return buf, nil
}

20
vendor/github.com/btcsuite/btcutil/hdkeychain/test_coverage.txt generated vendored Normal file
View File

@@ -0,0 +1,20 @@
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.String 100.00% (18/18)
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.Zero 100.00% (9/9)
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.pubKeyBytes 100.00% (7/7)
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.Neuter 100.00% (6/6)
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.ECPrivKey 100.00% (4/4)
github.com/conformal/btcutil/hdkeychain/extendedkey.go zero 100.00% (3/3)
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.SetNet 100.00% (3/3)
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.Address 100.00% (2/2)
github.com/conformal/btcutil/hdkeychain/extendedkey.go newExtendedKey 100.00% (1/1)
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.IsPrivate 100.00% (1/1)
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.ParentFingerprint 100.00% (1/1)
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.ECPubKey 100.00% (1/1)
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.IsForNet 100.00% (1/1)
github.com/conformal/btcutil/hdkeychain/extendedkey.go NewKeyFromString 95.83% (23/24)
github.com/conformal/btcutil/hdkeychain/extendedkey.go ExtendedKey.Child 91.67% (33/36)
github.com/conformal/btcutil/hdkeychain/extendedkey.go NewMaster 91.67% (11/12)
github.com/conformal/btcutil/hdkeychain/extendedkey.go GenerateSeed 85.71% (6/7)
github.com/conformal/btcutil/hdkeychain ----------------------------- 95.59% (130/136)