233 lines
6.3 KiB
Go
233 lines
6.3 KiB
Go
// Copyright 2014 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package keystore
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import (
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"bytes"
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"crypto/ecdsa"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"time"
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"github.com/ethereum/go-ethereum/accounts"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/pborman/uuid"
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)
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const (
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version = 3
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)
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type Key struct {
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Id uuid.UUID // Version 4 "random" for unique id not derived from key data
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// to simplify lookups we also store the address
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Address common.Address
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// we only store privkey as pubkey/address can be derived from it
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// privkey in this struct is always in plaintext
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PrivateKey *ecdsa.PrivateKey
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}
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type keyStore interface {
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// Loads and decrypts the key from disk.
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GetKey(addr common.Address, filename string, auth string) (*Key, error)
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// Writes and encrypts the key.
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StoreKey(filename string, k *Key, auth string) error
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// Joins filename with the key directory unless it is already absolute.
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JoinPath(filename string) string
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}
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type plainKeyJSON struct {
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Address string `json:"address"`
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PrivateKey string `json:"privatekey"`
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Id string `json:"id"`
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Version int `json:"version"`
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}
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type encryptedKeyJSONV3 struct {
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Address string `json:"address"`
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Crypto CryptoJSON `json:"crypto"`
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Id string `json:"id"`
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Version int `json:"version"`
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}
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type encryptedKeyJSONV1 struct {
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Address string `json:"address"`
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Crypto CryptoJSON `json:"crypto"`
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Id string `json:"id"`
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Version string `json:"version"`
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}
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type CryptoJSON struct {
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Cipher string `json:"cipher"`
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CipherText string `json:"ciphertext"`
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CipherParams cipherparamsJSON `json:"cipherparams"`
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KDF string `json:"kdf"`
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KDFParams map[string]interface{} `json:"kdfparams"`
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MAC string `json:"mac"`
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}
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type cipherparamsJSON struct {
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IV string `json:"iv"`
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}
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func (k *Key) MarshalJSON() (j []byte, err error) {
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jStruct := plainKeyJSON{
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hex.EncodeToString(k.Address[:]),
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hex.EncodeToString(crypto.FromECDSA(k.PrivateKey)),
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k.Id.String(),
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version,
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}
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j, err = json.Marshal(jStruct)
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return j, err
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}
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func (k *Key) UnmarshalJSON(j []byte) (err error) {
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keyJSON := new(plainKeyJSON)
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err = json.Unmarshal(j, &keyJSON)
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if err != nil {
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return err
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}
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u := new(uuid.UUID)
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*u = uuid.Parse(keyJSON.Id)
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k.Id = *u
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addr, err := hex.DecodeString(keyJSON.Address)
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if err != nil {
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return err
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}
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privkey, err := crypto.HexToECDSA(keyJSON.PrivateKey)
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if err != nil {
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return err
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}
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k.Address = common.BytesToAddress(addr)
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k.PrivateKey = privkey
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return nil
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}
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func newKeyFromECDSA(privateKeyECDSA *ecdsa.PrivateKey) *Key {
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id := uuid.NewRandom()
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key := &Key{
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Id: id,
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Address: crypto.PubkeyToAddress(privateKeyECDSA.PublicKey),
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PrivateKey: privateKeyECDSA,
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}
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return key
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}
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// NewKeyForDirectICAP generates a key whose address fits into < 155 bits so it can fit
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// into the Direct ICAP spec. for simplicity and easier compatibility with other libs, we
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// retry until the first byte is 0.
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func NewKeyForDirectICAP(rand io.Reader) *Key {
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randBytes := make([]byte, 64)
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_, err := rand.Read(randBytes)
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if err != nil {
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panic("key generation: could not read from random source: " + err.Error())
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}
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reader := bytes.NewReader(randBytes)
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privateKeyECDSA, err := ecdsa.GenerateKey(crypto.S256(), reader)
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if err != nil {
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panic("key generation: ecdsa.GenerateKey failed: " + err.Error())
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}
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key := newKeyFromECDSA(privateKeyECDSA)
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if !strings.HasPrefix(key.Address.Hex(), "0x00") {
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return NewKeyForDirectICAP(rand)
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}
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return key
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}
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func newKey(rand io.Reader) (*Key, error) {
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privateKeyECDSA, err := ecdsa.GenerateKey(crypto.S256(), rand)
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if err != nil {
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return nil, err
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}
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return newKeyFromECDSA(privateKeyECDSA), nil
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}
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func storeNewKey(ks keyStore, rand io.Reader, auth string) (*Key, accounts.Account, error) {
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key, err := newKey(rand)
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if err != nil {
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return nil, accounts.Account{}, err
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}
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a := accounts.Account{
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Address: key.Address,
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URL: accounts.URL{Scheme: KeyStoreScheme, Path: ks.JoinPath(keyFileName(key.Address))},
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}
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if err := ks.StoreKey(a.URL.Path, key, auth); err != nil {
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zeroKey(key.PrivateKey)
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return nil, a, err
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}
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return key, a, err
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}
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func writeTemporaryKeyFile(file string, content []byte) (string, error) {
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// Create the keystore directory with appropriate permissions
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// in case it is not present yet.
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const dirPerm = 0700
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if err := os.MkdirAll(filepath.Dir(file), dirPerm); err != nil {
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return "", err
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}
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// Atomic write: create a temporary hidden file first
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// then move it into place. TempFile assigns mode 0600.
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f, err := ioutil.TempFile(filepath.Dir(file), "."+filepath.Base(file)+".tmp")
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if err != nil {
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return "", err
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}
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if _, err := f.Write(content); err != nil {
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f.Close()
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os.Remove(f.Name())
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return "", err
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}
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f.Close()
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return f.Name(), nil
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}
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func writeKeyFile(file string, content []byte) error {
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name, err := writeTemporaryKeyFile(file, content)
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if err != nil {
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return err
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}
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return os.Rename(name, file)
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}
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// keyFileName implements the naming convention for keyfiles:
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// UTC--<created_at UTC ISO8601>-<address hex>
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func keyFileName(keyAddr common.Address) string {
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ts := time.Now().UTC()
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return fmt.Sprintf("UTC--%s--%s", toISO8601(ts), hex.EncodeToString(keyAddr[:]))
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}
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func toISO8601(t time.Time) string {
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var tz string
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name, offset := t.Zone()
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if name == "UTC" {
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tz = "Z"
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} else {
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tz = fmt.Sprintf("%03d00", offset/3600)
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}
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return fmt.Sprintf("%04d-%02d-%02dT%02d-%02d-%02d.%09d%s",
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t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), t.Nanosecond(), tz)
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}
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