accounts

Documentation

Overview

Package accounts implements encrypted storage of secp256k1 private keys.

Keys are stored as encrypted JSON files according to the Web3 Secret Storage specification. See https://github.com/ethereum/wiki/wiki/Web3-Secret-Storage-Definition for more information.

Index

• Constants
• Variables
• func EncryptKey(key *Key, auth string, scryptN, scryptP int) ([]byte, error)
• type Account
  • func (acc *Account) MarshalJSON() ([]byte, error)
  • func (acc *Account) UnmarshalJSON(raw []byte) error
• type AmbiguousAddrError
  • func (err *AmbiguousAddrError) Error() string
• type Key
  • func DecryptKey(keyjson []byte, auth string) (*Key, error)
  • func NewKeyForDirectICAP(rand io.Reader) *Key
  • func (k *Key) MarshalJSON() (j []byte, err error)
  • func (k *Key) UnmarshalJSON(j []byte) (err error)
• type Manager
  • func NewManager(keydir string, scryptN, scryptP int) *Manager
  • func NewPlaintextManager(keydir string) *Manager
  • func (am *Manager) AccountByIndex(i int) (Account, error)
  • func (am *Manager) Accounts() []Account
  • func (am *Manager) Delete(a Account, passphrase string) error
  • func (am *Manager) Export(a Account, passphrase, newPassphrase string) (keyJSON []byte, err error)
  • func (am *Manager) Find(a Account) (Account, error)
  • func (am *Manager) HasAddress(addr common.Address) bool
  • func (am *Manager) Import(keyJSON []byte, passphrase, newPassphrase string) (Account, error)
  • func (am *Manager) ImportECDSA(priv *ecdsa.PrivateKey, passphrase string) (Account, error)
  • func (am *Manager) ImportPreSaleKey(keyJSON []byte, passphrase string) (Account, error)
  • func (am *Manager) Lock(addr common.Address) error
  • func (am *Manager) NewAccount(passphrase string) (Account, error)
  • func (am *Manager) Sign(addr common.Address, hash []byte) ([]byte, error)
  • func (am *Manager) SignWithPassphrase(a Account, passphrase string, hash []byte) (signature []byte, err error)
  • func (am *Manager) TimedUnlock(a Account, passphrase string, timeout time.Duration) error
  • func (am *Manager) Unlock(a Account, passphrase string) error
  • func (am *Manager) Update(a Account, passphrase, newPassphrase string) error

Constants

const (

	// StandardScryptN is the N parameter of Scrypt encryption algorithm, using 256MB
	// memory and taking approximately 1s CPU time on a modern processor.
	StandardScryptN = 1 << 18

	// StandardScryptP is the P parameter of Scrypt encryption algorithm, using 256MB
	// memory and taking approximately 1s CPU time on a modern processor.
	StandardScryptP = 1

	// LightScryptN is the N parameter of Scrypt encryption algorithm, using 4MB
	// memory and taking approximately 100ms CPU time on a modern processor.
	LightScryptN = 1 << 12

	// LightScryptP is the P parameter of Scrypt encryption algorithm, using 4MB
	// memory and taking approximately 100ms CPU time on a modern processor.
	LightScryptP = 6
)

Variables

var (
	ErrLocked  = errors.New("account is locked")
	ErrNoMatch = errors.New("no key for given address or file")
	ErrDecrypt = errors.New("could not decrypt key with given passphrase")
)

Functions

func EncryptKey

func EncryptKey(key *Key, auth string, scryptN, scryptP int) ([]byte, error)

EncryptKey encrypts a key using the specified scrypt parameters into a json blob that can be decrypted later on.

Types

type Account

type Account struct {
	Address common.Address // Ethereum account address derived from the key

	// File contains the key file name.
	// When Acccount is used as an argument to select a key, File can be left blank to
	// select just by address or set to the basename or absolute path of a file in the key
	// directory. Accounts returned by Manager will always contain an absolute path.
	File string
}

Account represents a stored key. When used as an argument, it selects a unique key file to act on.

func (*Account) MarshalJSON

func (acc *Account) MarshalJSON() ([]byte, error)

func (*Account) UnmarshalJSON

func (acc *Account) UnmarshalJSON(raw []byte) error

type AmbiguousAddrError

type AmbiguousAddrError struct {
	Addr    common.Address
	Matches []Account
}

AmbiguousAddrError is returned when attempting to unlock an address for which more than one file exists.

func (*AmbiguousAddrError) Error

func (err *AmbiguousAddrError) Error() string

type Key

type Key struct {
	Id uuid.UUID // Version 4 "random" for unique id not derived from key data
	// to simplify lookups we also store the address
	Address common.Address
	// we only store privkey as pubkey/address can be derived from it
	// privkey in this struct is always in plaintext
	PrivateKey *ecdsa.PrivateKey
}

func DecryptKey

func DecryptKey(keyjson []byte, auth string) (*Key, error)

DecryptKey decrypts a key from a json blob, returning the private key itself.

func NewKeyForDirectICAP

func NewKeyForDirectICAP(rand io.Reader) *Key

NewKeyForDirectICAP generates a key whose address fits into < 155 bits so it can fit into the Direct ICAP spec. for simplicity and easier compatibility with other libs, we retry until the first byte is 0.

func (*Key) MarshalJSON

func (k *Key) MarshalJSON() (j []byte, err error)

func (*Key) UnmarshalJSON

func (k *Key) UnmarshalJSON(j []byte) (err error)

type Manager

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

Manager manages a key storage directory on disk.

func NewManager

func NewManager(keydir string, scryptN, scryptP int) *Manager

NewManager creates a manager for the given directory.

func NewPlaintextManager

func NewPlaintextManager(keydir string) *Manager

NewPlaintextManager creates a manager for the given directory. Deprecated: Use NewManager.

func (*Manager) AccountByIndex

func (am *Manager) AccountByIndex(i int) (Account, error)

AccountByIndex returns the ith account.

func (*Manager) Accounts

func (am *Manager) Accounts() []Account

Accounts returns all key files present in the directory.

func (*Manager) Delete

func (am *Manager) Delete(a Account, passphrase string) error

Delete deletes the key matched by account if the passphrase is correct. If the account contains no filename, the address must match a unique key.

func (*Manager) Export

func (am *Manager) Export(a Account, passphrase, newPassphrase string) (keyJSON []byte, err error)

Export exports as a JSON key, encrypted with newPassphrase.

func (*Manager) Find

func (am *Manager) Find(a Account) (Account, error)

Find resolves the given account into a unique entry in the keystore.

func (*Manager) HasAddress

func (am *Manager) HasAddress(addr common.Address) bool

HasAddress reports whether a key with the given address is present.

func (*Manager) Import

func (am *Manager) Import(keyJSON []byte, passphrase, newPassphrase string) (Account, error)

Import stores the given encrypted JSON key into the key directory.

func (*Manager) ImportECDSA

func (am *Manager) ImportECDSA(priv *ecdsa.PrivateKey, passphrase string) (Account, error)

ImportECDSA stores the given key into the key directory, encrypting it with the passphrase.

func (*Manager) ImportPreSaleKey

func (am *Manager) ImportPreSaleKey(keyJSON []byte, passphrase string) (Account, error)

ImportPreSaleKey decrypts the given Ethereum presale wallet and stores a key file in the key directory. The key file is encrypted with the same passphrase.

func (*Manager) Lock

func (am *Manager) Lock(addr common.Address) error

Lock removes the private key with the given address from memory.

func (*Manager) NewAccount

func (am *Manager) NewAccount(passphrase string) (Account, error)

NewAccount generates a new key and stores it into the key directory, encrypting it with the passphrase.

func (*Manager) Sign

func (am *Manager) Sign(addr common.Address, hash []byte) ([]byte, error)

Sign calculates a ECDSA signature for the given hash. The produced signature is in the [R || S || V] format where V is 0 or 1.

func (*Manager) SignWithPassphrase

func (am *Manager) SignWithPassphrase(a Account, passphrase string, hash []byte) (signature []byte, err error)

SignWithPassphrase signs hash if the private key matching the given address can be decrypted with the given passphrase. The produced signature is in the [R || S || V] format where V is 0 or 1.

func (*Manager) TimedUnlock

func (am *Manager) TimedUnlock(a Account, passphrase string, timeout time.Duration) error

TimedUnlock unlocks the given account with the passphrase. The account stays unlocked for the duration of timeout. A timeout of 0 unlocks the account until the program exits. The account must match a unique key file.

If the account address is already unlocked for a duration, TimedUnlock extends or shortens the active unlock timeout. If the address was previously unlocked indefinitely the timeout is not altered.

func (*Manager) Unlock

func (am *Manager) Unlock(a Account, passphrase string) error

Unlock unlocks the given account indefinitely.

func (*Manager) Update

func (am *Manager) Update(a Account, passphrase, newPassphrase string) error

Update changes the passphrase of an existing account.