hd

Documentation

Overview

Package hd provides support for hierarchical deterministic wallets generation and derivation.

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
• Variables
• func ComputeMastersFromSeed(seed []byte) (secret [32]byte, chainCode [32]byte)
• func DerivePrivateKeyForPath(privKeyBytes, chainCode [32]byte, path string) ([]byte, error)
• type BIP44Params
  • func CreateHDPath(coinType, account, index uint32) *BIP44Params
  • func NewFundraiserParams(account, coinType, 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
• type DeriveFn
• type GenerateFn
• type PubKeyType
• type WalletGenerator

Constants

const (
	// MultiType implies that a pubkey is a multisignature
	MultiType = PubKeyType("multi")
	// Secp256k1Type uses the Bitcoin secp256k1 ECDSA parameters.
	Secp256k1Type = PubKeyType("secp256k1")
	// Ed25519Type represents the Ed25519Type signature system.
	// It is currently not supported for end-user keys (wallets/ledgers).
	Ed25519Type = PubKeyType("ed25519")
	// Sr25519Type represents the Sr25519Type signature system.
	Sr25519Type = PubKeyType("sr25519")
)

Variables

var Secp256k1 = secp256k1Algo{}

Secp256k1 uses the Bitcoin secp256k1 ECDSA parameters.

Functions

func ComputeMastersFromSeed

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

ComputeMastersFromSeed returns the master secret key's, and chain code.

func DerivePrivateKeyForPath

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

func CreateHDPath(coinType, account, index uint32) *BIP44Params

CreateHDPath returns BIP 44 object from account and index parameters.

func NewFundraiserParams

func NewFundraiserParams(account, coinType, addressIdx uint32) *BIP44Params

NewFundraiserParams creates a BIP 44 parameter object from the params: m / 44' / coinType' / 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)

NewParamsFromPath parses the BIP44 path and unmarshals it into a Bip44Params. It supports both absolute and relative paths.

func (BIP44Params) DerivationPath

func (p BIP44Params) DerivationPath() []uint32

DerivationPath returns the BIP44 fields as an array.

func (BIP44Params) String

func (p BIP44Params) String() string

String returns the full absolute HD path of the BIP44 (https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki) params: m / purpose' / coin_type' / account' / change / address_index

type DeriveFn

type DeriveFn func(mnemonic string, bip39Passphrase, hdPath string) ([]byte, error)

type GenerateFn

type GenerateFn func(bz []byte) types.PrivKey

type PubKeyType

type PubKeyType string

PubKeyType defines an algorithm to derive key-pairs which can be used for cryptographic signing.

type WalletGenerator

type WalletGenerator interface {
	Derive(mnemonic string, bip39Passphrase, hdPath string) ([]byte, error)
	Generate(bz []byte) types.PrivKey
}