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202 lines
5.3 KiB
202 lines
5.3 KiB
package keys
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import (
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"fmt"
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"strings"
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"github.com/pkg/errors"
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crypto "github.com/tendermint/go-crypto"
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"github.com/tendermint/go-crypto/keys/words"
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dbm "github.com/tendermint/tmlibs/db"
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)
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// dbKeybase combines encyption and storage implementation to provide
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// a full-featured key manager
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type dbKeybase struct {
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db dbm.DB
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codec words.Codec
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}
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func New(db dbm.DB, codec words.Codec) dbKeybase {
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return dbKeybase{
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db: db,
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codec: codec,
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}
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}
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var _ Keybase = dbKeybase{}
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// Create generates a new key and persists it to storage, encrypted
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// using the passphrase. It returns the generated seedphrase
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// (mnemonic) and the key Info. It returns an error if it fails to
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// generate a key for the given algo type, or if another key is
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// already stored under the same name.
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func (kb dbKeybase) Create(name, passphrase string, algo CryptoAlgo) (Info, string, error) {
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// NOTE: secret is SHA256 hashed by secp256k1 and ed25519.
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// 16 byte secret corresponds to 12 BIP39 words.
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// XXX: Ledgers use 24 words now - should we ?
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secret := crypto.CRandBytes(16)
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priv, err := generate(algo, secret)
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if err != nil {
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return Info{}, "", err
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}
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// encrypt and persist the key
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info := kb.writeKey(priv, name, passphrase)
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// we append the type byte to the serialized secret to help with
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// recovery
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// ie [secret] = [type] + [secret]
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typ := cryptoAlgoToByte(algo)
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secret = append([]byte{typ}, secret...)
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// return the mnemonic phrase
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words, err := kb.codec.BytesToWords(secret)
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seed := strings.Join(words, " ")
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return info, seed, err
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}
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// Recover converts a seedphrase to a private key and persists it,
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// encrypted with the given passphrase. Functions like Create, but
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// seedphrase is input not output.
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func (kb dbKeybase) Recover(name, passphrase, seedphrase string) (Info, error) {
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words := strings.Split(strings.TrimSpace(seedphrase), " ")
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secret, err := kb.codec.WordsToBytes(words)
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if err != nil {
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return Info{}, err
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}
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// secret is comprised of the actual secret with the type
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// appended.
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// ie [secret] = [type] + [secret]
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typ, secret := secret[0], secret[1:]
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algo := byteToCryptoAlgo(typ)
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priv, err := generate(algo, secret)
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if err != nil {
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return Info{}, err
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}
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// encrypt and persist key.
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public := kb.writeKey(priv, name, passphrase)
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return public, err
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}
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// List returns the keys from storage in alphabetical order.
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func (kb dbKeybase) List() ([]Info, error) {
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var res []Info
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iter := kb.db.Iterator(nil, nil)
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defer iter.Close()
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for ; iter.Valid(); iter.Next() {
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// key := iter.Key()
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info, err := readInfo(iter.Value())
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if err != nil {
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return nil, err
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}
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res = append(res, info)
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}
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return res, nil
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}
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// Get returns the public information about one key.
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func (kb dbKeybase) Get(name string) (Info, error) {
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bs := kb.db.Get(infoKey(name))
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return readInfo(bs)
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}
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// Sign signs the msg with the named key.
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// It returns an error if the key doesn't exist or the decryption fails.
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func (kb dbKeybase) Sign(name, passphrase string, msg []byte) (sig crypto.Signature, pub crypto.PubKey, err error) {
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info, err := kb.Get(name)
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if err != nil {
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return
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}
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priv, err := unarmorDecryptPrivKey(info.PrivKeyArmor, passphrase)
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if err != nil {
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return
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}
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sig = priv.Sign(msg)
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pub = priv.PubKey()
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return
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}
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func (kb dbKeybase) Export(name string) (armor string, err error) {
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bz := kb.db.Get(infoKey(name))
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if bz == nil {
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return "", errors.New("No key to export with name " + name)
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}
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return armorInfoBytes(bz), nil
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}
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func (kb dbKeybase) Import(name string, armor string) (err error) {
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bz := kb.db.Get(infoKey(name))
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if len(bz) > 0 {
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return errors.New("Cannot overwrite data for name " + name)
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}
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infoBytes, err := unarmorInfoBytes(armor)
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if err != nil {
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return
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}
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kb.db.Set(infoKey(name), infoBytes)
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return nil
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}
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// Delete removes key forever, but we must present the
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// proper passphrase before deleting it (for security).
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func (kb dbKeybase) Delete(name, passphrase string) error {
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// verify we have the proper password before deleting
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info, err := kb.Get(name)
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if err != nil {
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return err
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}
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_, err = unarmorDecryptPrivKey(info.PrivKeyArmor, passphrase)
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if err != nil {
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return err
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}
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kb.db.DeleteSync(infoKey(name))
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return nil
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}
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// Update changes the passphrase with which an already stored key is
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// encrypted.
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//
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// oldpass must be the current passphrase used for encryption,
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// newpass will be the only valid passphrase from this time forward.
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func (kb dbKeybase) Update(name, oldpass, newpass string) error {
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info, err := kb.Get(name)
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if err != nil {
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return err
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}
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key, err := unarmorDecryptPrivKey(info.PrivKeyArmor, oldpass)
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if err != nil {
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return err
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}
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kb.writeKey(key, name, newpass)
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return nil
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}
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func (kb dbKeybase) writeKey(priv crypto.PrivKey, name, passphrase string) Info {
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// generate the encrypted privkey
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privArmor := encryptArmorPrivKey(priv, passphrase)
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// make Info
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info := newInfo(name, priv.PubKey(), privArmor)
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// write them both
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kb.db.SetSync(infoKey(name), info.bytes())
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return info
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}
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func generate(algo CryptoAlgo, secret []byte) (crypto.PrivKey, error) {
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switch algo {
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case AlgoEd25519:
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return crypto.GenPrivKeyEd25519FromSecret(secret), nil
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case AlgoSecp256k1:
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return crypto.GenPrivKeySecp256k1FromSecret(secret), nil
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default:
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err := errors.Errorf("Cannot generate keys for algorithm: %s", algo)
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return nil, err
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}
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}
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func infoKey(name string) []byte {
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return []byte(fmt.Sprintf("%s.info", name))
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}
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