go-eth2-wallet-distributed

Distributed Ethereum 2 wallet.

Table of Contents

• Install
• Usage
• Maintainers
• Contribute
• License

Install

go-eth2-wallet-distributed is a standard Go module which can be installed with:

go get github.com/wealdtech/go-eth2-wallet-distributed

Usage

Access to the wallet is usually via go-eth2-wallet; the first two examples below shows how this can be achieved.

This wallet generates keys non-deterministically, i.e. there is no relationship between keys or idea of a "seed".

Wallet and account names may be composed of any valid UTF-8 characters; the only restriction is they can not start with the underscore (_) character.

Due to their nature, distributed wallets are not capable of creating accounts by themselves. Distributed accounts are created by a separate process, and a local part of the distributed wallet can be imported. Note that although distributed wallets do not have passphrases they still need to be unlocked before accounts can be imported. This can be carried out with walllet.Unlock(nil)

Batches

This wallet provides the ability to create account batches. A batch is a single piece of data that contains all accounts in a wallet at a given point in time, all encrypted with the same key. This significantly decreases the time to obtain and decrypt accounts, however it does make the wallet less dynamic in that changes to accounts in the wallet will not be reflected in the batch automatically.

Batching is a manual process, and must be triggered by the user calling the BatchWallet() function. It is recommended that batching is called once, after all required accounts in a wallet have been created. It is possible to run subsequent BatchWallet() functions if further accounts have been added, however each call will recreate the batch in its entirety rather than incrementally on top of any existing batch, and as such it can take a significant amount of time to complete. Wallets are unaware of changes in batches, so any Wallet would need to be discarded and re-opened after a call to BatchWallet()

Example

Creating a wallet

package main

import (
	context

	e2wallet "github.com/wealdtech/go-eth2-wallet"
)

func main() {

    // Create a wallet
    wallet, err := e2wallet.CreateWallet("My wallet", e2wallet.WithType("distributed"))
    if err != nil {
        panic(err)
    }

    ...
}

Accessing a wallet

package main

import (
	e2wallet "github.com/wealdtech/go-eth2-wallet"
)

func main() {

    // Open a wallet
    wallet, err := e2wallet.OpenWallet("My wallet")
    if err != nil {
        panic(err)
    }

    ...
}

Importing an account

package main

import (
	"context"

	e2wallet "github.com/wealdtech/go-eth2-wallet"
	e2wtypes "github.com/wealdtech/go-eth2-wallet-types/v2"
)

func main() {

	// Open a wallet
	wallet, err := e2wallet.OpenWallet("My wallet")
	if err != nil {
		panic(err)
	}

	err = wallet.(e2wtypes.WalletLocker).Unlock(context.Background(), nil)
	if err != nil {
		panic(err)
	}
	// Always immediately defer locking the wallet to ensure it does not remain unlocked outside of the function.
	defer wallet.(e2wtypes.WalletLocker).Lock(context.Background())

	// Data obtained from a distributed key generation process.
	privateKey := []byte{
		0x36, 0xe7, 0x51, 0xee, 0x36, 0x9c, 0x2d, 0xdd, 0xf3, 0x1a, 0x2b, 0x84, 0x0b, 0x05, 0x81, 0x92,
		0x77, 0xfc, 0xb3, 0xde, 0x81, 0xc3, 0xeb, 0x80, 0xde, 0x21, 0xcf, 0x2c, 0x74, 0xd6, 0xda, 0x3b,
	}
	signingThreshold := uint32(2)
	verificationVector := [][]byte{
		[]byte{
			0xb6, 0x81, 0x88, 0x71, 0x95, 0x0a, 0x0a, 0x51, 0x13, 0xbe, 0x35, 0xbb, 0x07, 0x06, 0x18, 0x4b,
			0x84, 0x16, 0x40, 0x8a, 0x9e, 0x8b, 0x64, 0x98, 0xd3, 0x07, 0xa5, 0x6f, 0xbb, 0x63, 0x4f, 0x93,
			0x4e, 0xf6, 0x1d, 0x39, 0x88, 0xcd, 0x0d, 0xa3, 0xf0, 0xa8, 0x5d, 0xf9, 0x07, 0x9d, 0x9b, 0x92,
		},
		[]byte{
			0x88, 0x8f, 0x45, 0xa1, 0x4a, 0x3f, 0x01, 0xff, 0x7c, 0xd1, 0xd4, 0xb0, 0x8b, 0xec, 0xd8, 0xfd,
			0x55, 0xfb, 0xf9, 0x2f, 0x40, 0xd1, 0x4d, 0xbd, 0xe8, 0xfd, 0x26, 0xe8, 0x65, 0xea, 0xda, 0x99,
			0xf4, 0x6b, 0x85, 0xa3, 0xbd, 0xf4, 0xd2, 0x33, 0xff, 0x3e, 0xe5, 0x67, 0x5d, 0xeb, 0x41, 0xef,
		},
	}
	participants := map[uint64]string{
		1: "server1:443",
		2: "server2:443",
		3: "server3:443",
	}

	account, err := wallet.(e2wtypes.WalletDistributedAccountImporter).ImportDistributedAccount(context.Background(),
		"My account",
		privateKey,
		signingThreshold,
		verificationVector,
		participants,
		[]byte("my account secret"))
	if err != nil {
		panic(err)
	}

	// Wallet should be locked as soon as unlocked operations have finished; it is safe to explicitly call wallet.Lock() as well
	// as defer it as per above.
	wallet.(e2wtypes.WalletLocker).Lock(context.Background())

	...
}

Maintainers

Jim McDonald: @mcdee.

Contribute

Contributions welcome. Please check out the issues.

License

Apache-2.0 © 2020 Weald Technology Trading Ltd