wallet

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 Go to latest Published: Mar 30, 2020 License: MIT Imports: 25 Imported by: 0

README

Wallet

TODO

  • Update layout of this README to match Renter README. (ie subsystems, key files, links, etc)
Wallet Encryption Subsystem

This section gives an overview of how encryption is handled within the I3v wallet and refers to the source code within encrypt.go. The encryption within the wallet is done using the Twofish cipher in Galois Counter Mode and hashing is done using the Blake2B algorithm.

The following pieces of information are currently being encrypted by the wallet:

Masterkey

The masterkey is a key that is either derived from a custom password provided by the user or the wallet seed if no custom password is provided. Either way, the custom password or seed are hashed before being used as the masterkey to encrypt/decrypt the wallet to produce exactly 32 bytes of entropy for the Twofish cipher. The masterkey itself is also never used directly to encrypt any data. Instead it is used with the wallet's UID to derive a key to encrypt the seed.

To allow the user to recover the wallet after forgetting a custom password, the masterkey is encrypted and stored within the wallet's BoltDB bucket. In this case the encryption key used is derived from the primary seed and the wallet's UID.

Seed Encryption

To protect the user's primary seed, the so-called seedFile is encrypted before being stored on disk within the wallet's BoltDB bucket. This file contains the primary seed, a random UID and the encrypted verification plaintext. The UID is used to derive a key to encrypt the verification plaintext from the masterkey and the verification plaintext can be used to verify that decrypting the seed was successful. This is done by decrypting the seedFile and then decrypting the verification plaintext and comparing it to the expected plaintext in the verificationPlaintextconstant. Without the verification plaintext this wouldn't be possible since both the UID and the seed are random entropy.

Locking / Unlocking the Wallet

"Locking" and "Unlocking" the wallet refers to the process of wiping sensitive data from memory and loading the encrypted data from disk into memory and decrypting it respectively. The following fields are wiped by the wallet's wipeSecrets method when the wallet is locked.

  • w.keys // secret keys derived from seeds
  • w.seeds // imported seeds
  • w.primarySeed // wallet's primary seed
Changing the password

There are 2 ways to change the wallet's password. Either by providing the current masterkey which allows the wallet to decrypt the data on disk and reencrypt it using a new key or by using the primary seed. The latter will use the seed to retrieve the masterkey from disk and then use it to reencrypt the wallet.

Documentation

Index

Constants

View Source 
const (
	// I3vgFileExtension is the file extension to be used for i3vg files
	I3vgFileExtension = ".i3vkey"

	// I3vgFileHeader is the header for all i3vg files. Do not change. Because i3vg was created
	// early in development, compatibility with i3vg requires manually handling
	// the headers and version instead of using the persist package.
	I3vgFileHeader = "i3vg"

	// I3vgFileVersion is the version number to be used for i3vg files
	I3vgFileVersion = "1.0"
)
View Source 
const (
	// RespendTimeout records the number of blocks that the wallet will wait
	// before spending an output that has been spent in the past. If the
	// transaction spending the output has not made it to the transaction pool
	// after the limit, the assumption is that it never will.
	RespendTimeout = 100
)

Variables

View Source 
var (

	// ErrInconsistentKeys is the error when keyfiles provided are for different addresses
	ErrInconsistentKeys = errors.New("keyfiles provided that are for different addresses")
	// ErrInsufficientKeys is the error when there's not enough keys provided to spend the i3vfunds
	ErrInsufficientKeys = errors.New("not enough keys provided to spend the i3vfunds")
	// ErrNoKeyfile is the error when no keyfile has been presented
	ErrNoKeyfile = errors.New("no keyfile has been presented")
	// ErrUnknownHeader is the error when file contains wrong header
	ErrUnknownHeader = errors.New("file contains the wrong header")
	// ErrUnknownVersion is the error when the file has an unknown version number
	ErrUnknownVersion = errors.New("file has an unknown version number")
)

Functions

func ComputeValuedTransactions 

func ComputeValuedTransactions(pts []modules.ProcessedTransaction, blockHeight types.BlockHeight) ([]modules.ValuedTransaction, error)

ComputeValuedTransactions creates ValuedTransaction from a set of ProcessedTransactions.

func SignTransaction 

func SignTransaction(txn *types.Transaction, seed modules.Seed, toSign []crypto.Hash, height types.BlockHeight) error

SignTransaction signs txn using secret keys derived from seed. The transaction should be complete with the exception of the Signature fields of each TransactionSignature referenced by toSign, which must not be empty.

SignTransaction must derive all of the keys from scratch, so it is appreciably slower than calling the Wallet.SignTransaction method. Only the first 1 million keys are derived.

Types

type Wallet 

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

Wallet is an object that tracks balances, creates keys and addresses, manages building and sending transactions.

func New 

func New(cs modules.ConsensusSet, tpool modules.TransactionPool, persistDir string) (*Wallet, error)

New creates a new wallet, loading any known addresses from the input file name and then using the file to save in the future. Keys and addresses are not loaded into the wallet during the call to 'new', but rather during the call to 'Unlock'.

func NewCustomWallet 

func NewCustomWallet(cs modules.ConsensusSet, tpool modules.TransactionPool, persistDir string, deps modules.Dependencies) (*Wallet, error)

NewCustomWallet creates a new wallet using custom dependencies.

func (*Wallet) AddUnlockConditions 

func (w *Wallet) AddUnlockConditions(uc types.UnlockConditions) error

AddUnlockConditions adds a set of UnlockConditions to the wallet database.

func (*Wallet) AddWatchAddresses 

func (w *Wallet) AddWatchAddresses(addrs []types.UnlockHash, unused bool) error

AddWatchAddresses instructs the wallet to begin tracking a set of addresses, in addition to the addresses it was previously tracking. If none of the addresses have appeared in the blockchain, the unused flag may be set to true. Otherwise, the wallet must rescan the blockchain to search for transactions containing the addresses.

func (*Wallet) AddressTransactions 

func (w *Wallet) AddressTransactions(uh types.UnlockHash) (pts []modules.ProcessedTransaction, err error)

AddressTransactions returns all of the wallet transactions associated with a single unlock hash.

func (*Wallet) AddressUnconfirmedTransactions 

func (w *Wallet) AddressUnconfirmedTransactions(uh types.UnlockHash) (pts []modules.ProcessedTransaction, err error)

AddressUnconfirmedTransactions returns all of the unconfirmed wallet transactions related to a specific address.

func (*Wallet) Alerts 

func (w *Wallet) Alerts() []modules.Alert

Alerts implements the Alerter interface for the wallet.

func (*Wallet) AllAddresses 

func (w *Wallet) AllAddresses() ([]types.UnlockHash, error)

AllAddresses returns all addresses that the wallet is able to spend from, including unseeded addresses. Addresses are returned sorted in byte-order.

func (*Wallet) AllSeeds 

func (w *Wallet) AllSeeds() ([]modules.Seed, error)

AllSeeds returns a list of all seeds known to and used by the wallet.

func (*Wallet) ChangeKey 

func (w *Wallet) ChangeKey(masterKey crypto.CipherKey, newKey crypto.CipherKey) error

ChangeKey changes the wallet's encryption key from masterKey to newKey.

func (*Wallet) ChangeKeyWithSeed 

func (w *Wallet) ChangeKeyWithSeed(seed modules.Seed, newKey crypto.CipherKey) error

ChangeKeyWithSeed is the same as ChangeKey but uses the primary seed instead of the current masterKey.

func (*Wallet) Close 

func (w *Wallet) Close() error

Close terminates all ongoing processes involving the wallet, enabling garbage collection.

func (*Wallet) ConfirmedBalance 

func (w *Wallet) ConfirmedBalance() (i3vcoinBalance types.Currency, i3vfundBalance types.Currency, i3vfundClaimBalance types.Currency, err error)

ConfirmedBalance returns the balance of the wallet according to all of the confirmed transactions.

func (*Wallet) CreateBackup 

func (w *Wallet) CreateBackup(backupFilepath string) error

CreateBackup creates a backup file at the desired filepath.

func (*Wallet) DustThreshold 

func (w *Wallet) DustThreshold() (types.Currency, error)

DustThreshold returns the quantity per byte below which a Currency is considered to be Dust.

func (*Wallet) Encrypt 

func (w *Wallet) Encrypt(masterKey crypto.CipherKey) (modules.Seed, error)

Encrypt will create a primary seed for the wallet and encrypt it using masterKey. If masterKey is blank, then the hash of the primary seed will be used instead. The wallet will still be locked after Encrypt is called.

Encrypt can only be called once throughout the life of the wallet, and will return an error on subsequent calls (even after restarting the wallet). To reset the wallet, the wallet files must be moved to a different directory or deleted.

func (*Wallet) Encrypted 

func (w *Wallet) Encrypted() (bool, error)

Encrypted returns whether or not the wallet has been encrypted.

func (*Wallet) Height 

func (w *Wallet) Height() (types.BlockHeight, error)

Height return the internal processed consensus height of the wallet

func (*Wallet) InitFromSeed 

func (w *Wallet) InitFromSeed(masterKey crypto.CipherKey, seed modules.Seed) error

InitFromSeed functions like Init, but using a specified seed. Unlike Init, the blockchain will be scanned to determine the seed's progress. For this reason, InitFromSeed should not be called until the blockchain is fully synced.

func (*Wallet) IsMasterKey 

func (w *Wallet) IsMasterKey(masterKey crypto.CipherKey) (bool, error)

IsMasterKey verifies that the masterKey is the key used to encrypt the wallet.

func (*Wallet) LastAddresses 

func (w *Wallet) LastAddresses(n uint64) ([]types.UnlockHash, error)

LastAddresses returns the last n addresses starting at the last seedProgress for which an address was generated. If n is greater than the current progress, fewer than n keys will be returned. That means all addresses can be retrieved in reverse order by simply supplying math.MaxUint64 for n.

func (*Wallet) Load033xWallet 

func (w *Wallet) Load033xWallet(masterKey crypto.CipherKey, filepath033x string) error

Load033xWallet loads a v0.3.3.x wallet as an unseeded key, such that the funds become spendable to the current wallet.

func (*Wallet) LoadI3vgKeys 

func (w *Wallet) LoadI3vgKeys(masterKey crypto.CipherKey, keyfiles []string) error

LoadI3vgKeys loads a set of i3vg-generated keys into the wallet.

func (*Wallet) LoadSeed 

func (w *Wallet) LoadSeed(masterKey crypto.CipherKey, seed modules.Seed) error

LoadSeed will track all of the addresses generated by the input seed, reclaiming any funds that were lost due to a deleted file or lost encryption key. An error will be returned if the seed has already been integrated with the wallet.

func (*Wallet) Lock 

func (w *Wallet) Lock() error

Lock will erase all keys from memory and prevent the wallet from spending coins until it is unlocked.

func (*Wallet) NextAddress 

func (w *Wallet) NextAddress() (types.UnlockConditions, error)

NextAddress returns an unlock hash that is ready to receive i3vcoins or i3vfunds. The address is generated using the primary address seed.

func (*Wallet) NextAddresses 

func (w *Wallet) NextAddresses(n uint64) ([]types.UnlockConditions, error)

NextAddresses returns n unlock hashes that are ready to receive i3vcoins or i3vfunds. The addresses are generated using the primary address seed.

Warning: If this function is used to generate large numbers of addresses, those addresses should be used. Otherwise the lookahead might not be able to keep up and multiple wallets with the same seed might desync.

func (*Wallet) PrimarySeed 

func (w *Wallet) PrimarySeed() (modules.Seed, uint64, error)

PrimarySeed returns the decrypted primary seed of the wallet, as well as the number of addresses that the seed can be safely used to generate.

func (*Wallet) ProcessConsensusChange 

func (w *Wallet) ProcessConsensusChange(cc modules.ConsensusChange)

ProcessConsensusChange parses a consensus change to update the set of confirmed outputs known to the wallet.

func (*Wallet) ReceiveUpdatedUnconfirmedTransactions 

func (w *Wallet) ReceiveUpdatedUnconfirmedTransactions(diff *modules.TransactionPoolDiff)

ReceiveUpdatedUnconfirmedTransactions updates the wallet's unconfirmed transaction set.

func (*Wallet) RegisterTransaction 

func (w *Wallet) RegisterTransaction(t types.Transaction, parents []types.Transaction) (modules.TransactionBuilder, error)

RegisterTransaction takes a transaction and its parents and returns a modules.TransactionBuilder which can be used to expand the transaction. The most typical call is 'RegisterTransaction(types.Transaction{}, nil)', which registers a new transaction without parents.

func (*Wallet) RemoveWatchAddresses 

func (w *Wallet) RemoveWatchAddresses(addrs []types.UnlockHash, unused bool) error

RemoveWatchAddresses instructs the wallet to stop tracking a set of addresses and delete their associated transactions. If none of the addresses have appeared in the blockchain, the unused flag may be set to true. Otherwise, the wallet must rescan the blockchain to rebuild its transaction history.

func (*Wallet) Rescanning 

func (w *Wallet) Rescanning() (bool, error)

Rescanning reports whether the wallet is currently rescanning the blockchain.

func (*Wallet) Reset 

func (w *Wallet) Reset() error

Reset will reset the wallet, clearing the database and returning it to the unencrypted state.

func (*Wallet) SendI3vcoins 

func (w *Wallet) SendI3vcoins(amount types.Currency, dest types.UnlockHash) (txns []types.Transaction, err error)

SendI3vcoins creates a transaction sending 'amount' to 'dest'. The transaction is submitted to the transaction pool and is also returned.

func (*Wallet) SendI3vcoinsMulti 

func (w *Wallet) SendI3vcoinsMulti(outputs []types.I3vcoinOutput) (txns []types.Transaction, err error)

SendI3vcoinsMulti creates a transaction that includes the specified outputs. The transaction is submitted to the transaction pool and is also returned.

func (*Wallet) SendI3vfunds 

func (w *Wallet) SendI3vfunds(amount types.Currency, dest types.UnlockHash) (txns []types.Transaction, err error)

SendI3vfunds creates a transaction sending 'amount' to 'dest'. The transaction is submitted to the transaction pool and is also returned.

func (*Wallet) SetSettings 

func (w *Wallet) SetSettings(s modules.WalletSettings) error

SetSettings will update the settings for the wallet.

func (*Wallet) Settings 

func (w *Wallet) Settings() (modules.WalletSettings, error)

Settings returns the wallet's current settings

func (*Wallet) SignTransaction 

func (w *Wallet) SignTransaction(txn *types.Transaction, toSign []crypto.Hash) error

SignTransaction signs txn using secret keys known to the wallet. The transaction should be complete with the exception of the Signature fields of each TransactionSignature referenced by toSign. For convenience, if toSign is empty, SignTransaction signs everything that it can.

func (*Wallet) StartTransaction 

func (w *Wallet) StartTransaction() (modules.TransactionBuilder, error)

StartTransaction is a convenience function that calls RegisterTransaction(types.Transaction{}, nil).

func (*Wallet) SweepSeed 

func (w *Wallet) SweepSeed(seed modules.Seed) (coins, funds types.Currency, err error)

SweepSeed scans the blockchain for outputs generated from seed and creates a transaction that transfers them to the wallet. Note that this incurs a transaction fee. It returns the total value of the outputs, minus the fee. If only i3vfunds were found, the fee is deducted from the wallet.

func (*Wallet) Transaction 

func (w *Wallet) Transaction(txid types.TransactionID) (pt modules.ProcessedTransaction, found bool, err error)

Transaction returns the transaction with the given id. 'False' is returned if the transaction does not exist.

func (*Wallet) Transactions 

func (w *Wallet) Transactions(startHeight, endHeight types.BlockHeight) (pts []modules.ProcessedTransaction, err error)

Transactions returns all transactions relevant to the wallet that were confirmed in the range [startHeight, endHeight].

func (*Wallet) UnconfirmedBalance 

func (w *Wallet) UnconfirmedBalance() (outgoingI3vcoins types.Currency, incomingI3vcoins types.Currency, err error)

UnconfirmedBalance returns the number of outgoing and incoming i3vcoins in the unconfirmed transaction set. Refund outputs are included in this reporting.

func (*Wallet) UnconfirmedTransactions 

func (w *Wallet) UnconfirmedTransactions() ([]modules.ProcessedTransaction, error)

UnconfirmedTransactions returns the set of unconfirmed transactions that are relevant to the wallet.

func (*Wallet) Unlock 

func (w *Wallet) Unlock(masterKey crypto.CipherKey) error

Unlock will decrypt the wallet seed and load all of the addresses into memory.

func (*Wallet) UnlockAsync 

func (w *Wallet) UnlockAsync(masterKey crypto.CipherKey) <-chan error

UnlockAsync will decrypt the wallet seed and load all of the addresses into memory.

func (*Wallet) UnlockConditions 

func (w *Wallet) UnlockConditions(addr types.UnlockHash) (uc types.UnlockConditions, err error)

UnlockConditions returns the UnlockConditions for the specified address, if they are known to the wallet.

func (*Wallet) Unlocked 

func (w *Wallet) Unlocked() (bool, error)

Unlocked indicates whether the wallet is locked or unlocked.

func (*Wallet) UnspentOutputs 

func (w *Wallet) UnspentOutputs() ([]modules.UnspentOutput, error)

UnspentOutputs returns the unspent outputs tracked by the wallet.

func (*Wallet) WatchAddresses 

func (w *Wallet) WatchAddresses() ([]types.UnlockHash, error)

WatchAddresses returns the set of addresses that the wallet is currently watching.

Source Files

View all Source files

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