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keybase.go
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keybase.go
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package keys
import (
"bufio"
"fmt"
"os"
"strings"
"github.com/pkg/errors"
"github.com/cosmos/go-bip39"
"github.com/cosmos/cosmos-sdk/crypto"
"github.com/cosmos/cosmos-sdk/crypto/keys/hd"
"github.com/cosmos/cosmos-sdk/crypto/keys/mintkey"
"github.com/cosmos/cosmos-sdk/types"
tmcrypto "github.com/tendermint/tendermint/crypto"
"github.com/tendermint/tendermint/crypto/encoding/amino"
"github.com/tendermint/tendermint/crypto/secp256k1"
dbm "github.com/tendermint/tendermint/libs/db"
"github.com/cosmos/cosmos-sdk/crypto/keys/keyerror"
)
var _ Keybase = dbKeybase{}
// Language is a language to create the BIP 39 mnemonic in.
// Currently, only english is supported though.
// Find a list of all supported languages in the BIP 39 spec (word lists).
type Language int
const (
// English is the default language to create a mnemonic.
// It is the only supported language by this package.
English Language = iota + 1
// Japanese is currently not supported.
Japanese
// Korean is currently not supported.
Korean
// Spanish is currently not supported.
Spanish
// ChineseSimplified is currently not supported.
ChineseSimplified
// ChineseTraditional is currently not supported.
ChineseTraditional
// French is currently not supported.
French
// Italian is currently not supported.
Italian
addressSuffix = "address"
infoSuffix = "info"
)
const (
// used for deriving seed from mnemonic
defaultBIP39Passphrase = ""
// bits of entropy to draw when creating a mnemonic
defaultEntropySize = 256
)
var (
// ErrUnsupportedSigningAlgo is raised when the caller tries to use a
// different signing scheme than secp256k1.
ErrUnsupportedSigningAlgo = errors.New("unsupported signing algo: only secp256k1 is supported")
// ErrUnsupportedLanguage is raised when the caller tries to use a
// different language than english for creating a mnemonic sentence.
ErrUnsupportedLanguage = errors.New("unsupported language: only english is supported")
)
// dbKeybase combines encryption and storage implementation to provide
// a full-featured key manager
type dbKeybase struct {
db dbm.DB
}
// New creates a new keybase instance using the passed DB for reading and writing keys.
func New(db dbm.DB) Keybase {
return dbKeybase{
db: db,
}
}
// CreateMnemonic generates a new key and persists it to storage, encrypted
// using the provided password.
// It returns the generated mnemonic and the key Info.
// It returns an error if it fails to
// generate a key for the given algo type, or if another key is
// already stored under the same name.
func (kb dbKeybase) CreateMnemonic(name string, language Language, passwd string, algo SigningAlgo) (info Info, mnemonic string, err error) {
if language != English {
return nil, "", ErrUnsupportedLanguage
}
if algo != Secp256k1 {
err = ErrUnsupportedSigningAlgo
return
}
// default number of words (24):
// this generates a mnemonic directly from the number of words by reading system entropy.
entropy, err := bip39.NewEntropy(defaultEntropySize)
if err != nil {
return
}
mnemonic, err = bip39.NewMnemonic(entropy)
if err != nil {
return
}
seed := bip39.NewSeed(mnemonic, defaultBIP39Passphrase)
info, err = kb.persistDerivedKey(seed, passwd, name, hd.FullFundraiserPath)
return
}
// TEMPORARY METHOD UNTIL WE FIGURE OUT USER FACING HD DERIVATION API
func (kb dbKeybase) CreateKey(name, mnemonic, passwd string) (info Info, err error) {
words := strings.Split(mnemonic, " ")
if len(words) != 12 && len(words) != 24 {
err = fmt.Errorf("recovering only works with 12 word (fundraiser) or 24 word mnemonics, got: %v words", len(words))
return
}
seed, err := bip39.NewSeedWithErrorChecking(mnemonic, defaultBIP39Passphrase)
if err != nil {
return
}
info, err = kb.persistDerivedKey(seed, passwd, name, hd.FullFundraiserPath)
return
}
// CreateFundraiserKey converts a mnemonic to a private key and persists it,
// encrypted with the given password.
// TODO(ismail)
func (kb dbKeybase) CreateFundraiserKey(name, mnemonic, passwd string) (info Info, err error) {
words := strings.Split(mnemonic, " ")
if len(words) != 12 {
err = fmt.Errorf("recovering only works with 12 word (fundraiser), got: %v words", len(words))
return
}
seed, err := bip39.NewSeedWithErrorChecking(mnemonic, defaultBIP39Passphrase)
if err != nil {
return
}
info, err = kb.persistDerivedKey(seed, passwd, name, hd.FullFundraiserPath)
return
}
func (kb dbKeybase) Derive(name, mnemonic, bip39Passphrase, encryptPasswd string, params hd.BIP44Params) (info Info, err error) {
seed, err := bip39.NewSeedWithErrorChecking(mnemonic, bip39Passphrase)
if err != nil {
return
}
info, err = kb.persistDerivedKey(seed, encryptPasswd, name, params.String())
return
}
// CreateLedger creates a new locally-stored reference to a Ledger keypair
// It returns the created key info and an error if the Ledger could not be queried
func (kb dbKeybase) CreateLedger(name string, path crypto.DerivationPath, algo SigningAlgo) (Info, error) {
if algo != Secp256k1 {
return nil, ErrUnsupportedSigningAlgo
}
priv, err := crypto.NewPrivKeyLedgerSecp256k1(path)
if err != nil {
return nil, err
}
pub := priv.PubKey()
return kb.writeLedgerKey(pub, path, name), nil
}
// CreateOffline creates a new reference to an offline keypair
// It returns the created key info
func (kb dbKeybase) CreateOffline(name string, pub tmcrypto.PubKey) (Info, error) {
return kb.writeOfflineKey(pub, name), nil
}
func (kb *dbKeybase) persistDerivedKey(seed []byte, passwd, name, fullHdPath string) (info Info, err error) {
// create master key and derive first key:
masterPriv, ch := hd.ComputeMastersFromSeed(seed)
derivedPriv, err := hd.DerivePrivateKeyForPath(masterPriv, ch, fullHdPath)
if err != nil {
return
}
// if we have a password, use it to encrypt the private key and store it
// else store the public key only
if passwd != "" {
info = kb.writeLocalKey(secp256k1.PrivKeySecp256k1(derivedPriv), name, passwd)
} else {
pubk := secp256k1.PrivKeySecp256k1(derivedPriv).PubKey()
info = kb.writeOfflineKey(pubk, name)
}
return
}
// List returns the keys from storage in alphabetical order.
func (kb dbKeybase) List() ([]Info, error) {
var res []Info
iter := kb.db.Iterator(nil, nil)
defer iter.Close()
for ; iter.Valid(); iter.Next() {
key := string(iter.Key())
// need to include only keys in storage that have an info suffix
if strings.HasSuffix(key, infoSuffix) {
info, err := readInfo(iter.Value())
if err != nil {
return nil, err
}
res = append(res, info)
}
}
return res, nil
}
// Get returns the public information about one key.
func (kb dbKeybase) Get(name string) (Info, error) {
bs := kb.db.Get(infoKey(name))
if len(bs) == 0 {
return nil, keyerror.NewErrKeyNotFound(name)
}
return readInfo(bs)
}
func (kb dbKeybase) GetByAddress(address types.AccAddress) (Info, error) {
ik := kb.db.Get(addrKey(address))
if len(ik) == 0 {
return nil, fmt.Errorf("key with address %s not found", address)
}
bs := kb.db.Get(ik)
return readInfo(bs)
}
// Sign signs the msg with the named key.
// It returns an error if the key doesn't exist or the decryption fails.
func (kb dbKeybase) Sign(name, passphrase string, msg []byte) (sig []byte, pub tmcrypto.PubKey, err error) {
info, err := kb.Get(name)
if err != nil {
return
}
var priv tmcrypto.PrivKey
switch info.(type) {
case localInfo:
linfo := info.(localInfo)
if linfo.PrivKeyArmor == "" {
err = fmt.Errorf("private key not available")
return
}
priv, err = mintkey.UnarmorDecryptPrivKey(linfo.PrivKeyArmor, passphrase)
if err != nil {
return nil, nil, err
}
case ledgerInfo:
linfo := info.(ledgerInfo)
priv, err = crypto.NewPrivKeyLedgerSecp256k1(linfo.Path)
if err != nil {
return
}
case offlineInfo:
linfo := info.(offlineInfo)
_, err := fmt.Fprintf(os.Stderr, "Bytes to sign:\n%s", msg)
if err != nil {
return nil, nil, err
}
buf := bufio.NewReader(os.Stdin)
_, err = fmt.Fprintf(os.Stderr, "\nEnter Amino-encoded signature:\n")
if err != nil {
return nil, nil, err
}
// Will block until user inputs the signature
signed, err := buf.ReadString('\n')
if err != nil {
return nil, nil, err
}
cdc.MustUnmarshalBinaryLengthPrefixed([]byte(signed), sig)
return sig, linfo.GetPubKey(), nil
}
sig, err = priv.Sign(msg)
if err != nil {
return nil, nil, err
}
pub = priv.PubKey()
return sig, pub, nil
}
func (kb dbKeybase) ExportPrivateKeyObject(name string, passphrase string) (tmcrypto.PrivKey, error) {
info, err := kb.Get(name)
if err != nil {
return nil, err
}
var priv tmcrypto.PrivKey
switch info.(type) {
case localInfo:
linfo := info.(localInfo)
if linfo.PrivKeyArmor == "" {
err = fmt.Errorf("private key not available")
return nil, err
}
priv, err = mintkey.UnarmorDecryptPrivKey(linfo.PrivKeyArmor, passphrase)
if err != nil {
return nil, err
}
case ledgerInfo:
return nil, errors.New("Only works on local private keys")
case offlineInfo:
return nil, errors.New("Only works on local private keys")
}
return priv, nil
}
func (kb dbKeybase) Export(name string) (armor string, err error) {
bz := kb.db.Get(infoKey(name))
if bz == nil {
return "", fmt.Errorf("no key to export with name %s", name)
}
return mintkey.ArmorInfoBytes(bz), nil
}
// ExportPubKey returns public keys in ASCII armored format.
// Retrieve a Info object by its name and return the public key in
// a portable format.
func (kb dbKeybase) ExportPubKey(name string) (armor string, err error) {
bz := kb.db.Get(infoKey(name))
if bz == nil {
return "", fmt.Errorf("no key to export with name %s", name)
}
info, err := readInfo(bz)
if err != nil {
return
}
return mintkey.ArmorPubKeyBytes(info.GetPubKey().Bytes()), nil
}
func (kb dbKeybase) Import(name string, armor string) (err error) {
bz := kb.db.Get(infoKey(name))
if len(bz) > 0 {
return errors.New("Cannot overwrite data for name " + name)
}
infoBytes, err := mintkey.UnarmorInfoBytes(armor)
if err != nil {
return
}
kb.db.Set(infoKey(name), infoBytes)
return nil
}
// ImportPubKey imports ASCII-armored public keys.
// Store a new Info object holding a public key only, i.e. it will
// not be possible to sign with it as it lacks the secret key.
func (kb dbKeybase) ImportPubKey(name string, armor string) (err error) {
bz := kb.db.Get(infoKey(name))
if len(bz) > 0 {
return errors.New("Cannot overwrite data for name " + name)
}
pubBytes, err := mintkey.UnarmorPubKeyBytes(armor)
if err != nil {
return
}
pubKey, err := cryptoAmino.PubKeyFromBytes(pubBytes)
if err != nil {
return
}
kb.writeOfflineKey(pubKey, name)
return
}
// Delete removes key forever, but we must present the
// proper passphrase before deleting it (for security).
// It returns an error if the key doesn't exist or
// passphrases don't match.
// Passphrase is ignored when deleting references to
// offline and Ledger / HW wallet keys.
func (kb dbKeybase) Delete(name, passphrase string, skipPass bool) error {
// verify we have the proper password before deleting
info, err := kb.Get(name)
if err != nil {
return err
}
if linfo, ok := info.(localInfo); ok && !skipPass {
if _, err = mintkey.UnarmorDecryptPrivKey(linfo.PrivKeyArmor, passphrase); err != nil {
return err
}
}
kb.db.DeleteSync(addrKey(info.GetAddress()))
kb.db.DeleteSync(infoKey(name))
return nil
}
// Update changes the passphrase with which an already stored key is
// encrypted.
//
// oldpass must be the current passphrase used for encryption,
// getNewpass is a function to get the passphrase to permanently replace
// the current passphrase
func (kb dbKeybase) Update(name, oldpass string, getNewpass func() (string, error)) error {
info, err := kb.Get(name)
if err != nil {
return err
}
switch info.(type) {
case localInfo:
linfo := info.(localInfo)
key, err := mintkey.UnarmorDecryptPrivKey(linfo.PrivKeyArmor, oldpass)
if err != nil {
return err
}
newpass, err := getNewpass()
if err != nil {
return err
}
kb.writeLocalKey(key, name, newpass)
return nil
default:
return fmt.Errorf("locally stored key required")
}
}
// CloseDB releases the lock and closes the storage backend.
func (kb dbKeybase) CloseDB() {
kb.db.Close()
}
func (kb dbKeybase) writeLocalKey(priv tmcrypto.PrivKey, name, passphrase string) Info {
// encrypt private key using passphrase
privArmor := mintkey.EncryptArmorPrivKey(priv, passphrase)
// make Info
pub := priv.PubKey()
info := newLocalInfo(name, pub, privArmor)
kb.writeInfo(info, name)
return info
}
func (kb dbKeybase) writeLedgerKey(pub tmcrypto.PubKey, path crypto.DerivationPath, name string) Info {
info := newLedgerInfo(name, pub, path)
kb.writeInfo(info, name)
return info
}
func (kb dbKeybase) writeOfflineKey(pub tmcrypto.PubKey, name string) Info {
info := newOfflineInfo(name, pub)
kb.writeInfo(info, name)
return info
}
func (kb dbKeybase) writeInfo(info Info, name string) {
// write the info by key
key := infoKey(name)
kb.db.SetSync(key, writeInfo(info))
// store a pointer to the infokey by address for fast lookup
kb.db.SetSync(addrKey(info.GetAddress()), key)
}
func addrKey(address types.AccAddress) []byte {
return []byte(fmt.Sprintf("%s.%s", address.String(), addressSuffix))
}
func infoKey(name string) []byte {
return []byte(fmt.Sprintf("%s.%s", name, infoSuffix))
}