hdwallets

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 Go to latest Published: Dec 11, 2019 License: MIT Imports: 13 Imported by: 0

README

Go BLS HD Wallet tools

This library is using the BLS12-381 curve to generate HD Wallets. This should not be used for Bitcoin or any other cryptocurrency using the secp256k1 curve.

Information

Since BLS public keys are a little bit larger than usual keys, the base58 encoding is not possible to be used on BLS HD wallets. Instead, we used bech32 encoding using the xpub and xprv prefixes in plain text.

Get this library

    go get github.com/grupokindynos/olympus-utils/hdwallets

Example

    // Generate a random 256 bit seed
    seed, err := hdwallets.GenerateSeed(256)

    // Create a master private key:
    // To create extended keys, you must add the prefix definitions.
    // To use Bitcoin defaults use nil as prefix param.
    masterprv := hdwallet.NewMaster(seed, nil)

    // Convert a private key to public key
    // To convert an extended key into the public form, you need to pass
    // de prefix defeinitions. To use the Bitcoin defaults, pass nil.
    masterpub := masterprv.Neuter(nil)
    
    // Generate hardened child key based on private or public key
    childprv, err := masterprv.Child(HardenedKeyStart + 0)
    childpub, err := masterpub.Child(HardenedKeyStart + 0)

    // Generate new child key based on private or public key
    childprv, err := masterprv.Child(0)
    childpub, err := masterpub.Child(0)

Documentation

Index

Constants

View Source 
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

)

Variables

View Source 
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")
)

Functions

func GenerateSeed 

func GenerateSeed(length uint8) ([]byte, error)

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 NewHash512 

func NewHash512() hash.Hash

NewHash512 creates a new 512-bit hash.

Types

type ExtendedKey 

type ExtendedKey struct {
	// contains filtered or unexported fields
}

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.

func NewExtendedKey 

func NewExtendedKey(version, key, chainCode, parentFP []byte, depth uint8,
	childNum uint32, isPrivate bool) *ExtendedKey

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 NewKeyFromString 

func NewKeyFromString(key string) (*ExtendedKey, error)

NewKeyFromString returns a new extended key instance from a base58-encoded extended key.

func NewMaster 

func NewMaster(seed []byte, net *NetPrefix) (*ExtendedKey, error)

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 (*ExtendedKey) BlsPrivKey 

func (k *ExtendedKey) BlsPrivKey() (*g1pubs.SecretKey, error)

BlsPrivKey converts the extended key to a bls 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 (*ExtendedKey) BlsPubKey 

func (k *ExtendedKey) BlsPubKey() (*g1pubs.PublicKey, error)

BlsPubKey converts the extended key to a bls public key and returns it.

func (*ExtendedKey) Child 

func (k *ExtendedKey) Child(i uint32) (*ExtendedKey, error)

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 (*ExtendedKey) Depth 

func (k *ExtendedKey) Depth() uint8

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 (*ExtendedKey) IsForNet 

func (k *ExtendedKey) IsForNet(net *NetPrefix) bool

IsForNet returns whether or not the extended key is associated with the passed bitcoin network.

func (*ExtendedKey) IsPrivate 

func (k *ExtendedKey) IsPrivate() bool

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 (*ExtendedKey) Neuter 

func (k *ExtendedKey) Neuter(net *NetPrefix) (*ExtendedKey, error)

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 (*ExtendedKey) ParentFingerprint 

func (k *ExtendedKey) ParentFingerprint() uint32

ParentFingerprint returns a fingerprint of the parent extended key from which this one was derived.

func (*ExtendedKey) SetNet 

func (k *ExtendedKey) SetNet(net *NetPrefix)

SetNet associates the extended key, and any child keys yet to be derived from it, with the passed network.

func (*ExtendedKey) String 

func (k *ExtendedKey) String() string

String returns the extended key as a human-readable base58-encoded string.

func (*ExtendedKey) Zero 

func (k *ExtendedKey) Zero()

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.

type Hash512 

type Hash512 struct {
	// contains filtered or unexported fields
}

Hash512 is a 512-bit hash based on two SHA256 hashes concatenated together.

func (*Hash512) BlockSize 

func (h *Hash512) BlockSize() int

BlockSize gets the block size of the hash (which is the same as SHA256).

func (*Hash512) Reset 

func (h *Hash512) Reset()

Reset resets the hash to the default state.

func (*Hash512) Size 

func (h *Hash512) Size() int

Size gets the size of the hash in bytes.

func (*Hash512) Sum 

func (h *Hash512) Sum(data []byte) []byte

Sum appends the checksum of the hash to the data provided and returns it.

func (*Hash512) Write 

func (h *Hash512) Write(data []byte) (int, error)

type NetPrefix 

type NetPrefix struct {
	ExtPub  []byte
	ExtPriv []byte
}

NetPrefix are prefixes used per-network.

Source Files

View all Source files

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