hd

Documentation

Overview

Package hd provides basic functionality Hierarchical Deterministic Wallets.

The user must understand the overall concept of the BIP 32 and the BIP 44 specs:

https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki
https://github.com/bitcoin/bips/blob/master/bip-0032.mediawiki

In combination with the bip39 package in go-crypto this package provides the functionality for deriving keys using a BIP 44 HD path, or, more general, by passing a BIP 32 path.

In particular, this package (together with bip39) provides all necessary functionality to derive keys from mnemonics generated during the cosmos fundraiser.

Index

• Constants
• func ComputeMastersFromSeed(seed []byte) (secret [32]byte, chainCode [32]byte)
• func DerivePrivateKeyForPath(privKeyBytes [32]byte, chainCode [32]byte, path string) ([32]byte, error)
• type BIP44Params
  • func NewFundraiserParams(account uint32, addressIdx uint32) *BIP44Params
  • func NewParams(purpose, coinType, account uint32, change bool, addressIdx uint32) *BIP44Params
  • func NewParamsFromPath(path string) (*BIP44Params, error)
  • func (p BIP44Params) DerivationPath() []uint32
  • func (p BIP44Params) String() string

Constants

const (
	BIP44Prefix        = "44'/118'/"
	FullFundraiserPath = BIP44Prefix + "0'/0/0"
)

BIP44Prefix is the parts of the BIP32 HD path that are fixed by what we used during the fundraiser.

Functions

func ComputeMastersFromSeed

func ComputeMastersFromSeed(seed []byte) (secret [32]byte, chainCode [32]byte)

ComputeMastersFromSeed returns the master public key, master secret, and chain code in hex.

func DerivePrivateKeyForPath

func DerivePrivateKeyForPath(privKeyBytes [32]byte, chainCode [32]byte, path string) ([32]byte, error)

DerivePrivateKeyForPath derives the private key by following the BIP 32/44 path from privKeyBytes, using the given chainCode.

Types

type BIP44Params

type BIP44Params struct {
	Purpose      uint32 `json:"purpose"`
	CoinType     uint32 `json:"coinType"`
	Account      uint32 `json:"account"`
	Change       bool   `json:"change"`
	AddressIndex uint32 `json:"addressIndex"`
}

BIP44Params wraps BIP 44 params (5 level BIP 32 path). To receive a canonical string representation ala m / purpose' / coinType' / account' / change / addressIndex call String() on a BIP44Params instance.

func NewFundraiserParams

func NewFundraiserParams(account uint32, addressIdx uint32) *BIP44Params

NewFundraiserParams creates a BIP 44 parameter object from the params: m / 44' / 118' / account' / 0 / address_index The fixed parameters (purpose', coin_type', and change) are determined by what was used in the fundraiser.

func NewParams

func NewParams(purpose, coinType, account uint32, change bool, addressIdx uint32) *BIP44Params

NewParams creates a BIP 44 parameter object from the params: m / purpose' / coinType' / account' / change / addressIndex

func NewParamsFromPath

func NewParamsFromPath(path string) (*BIP44Params, error)

Parse the BIP44 path and unmarshal into the struct. nolint: gocyclo

func (BIP44Params) DerivationPath

func (p BIP44Params) DerivationPath() []uint32

DerivationPath returns the BIP44 fields as an array.

func (BIP44Params) String

func (p BIP44Params) String() string