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125 lines
3.4 KiB
125 lines
3.4 KiB
package cryptostore
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import keys "github.com/tendermint/go-crypto/keys"
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// Manager combines encyption and storage implementation to provide
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// a full-featured key manager
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type Manager struct {
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es encryptedStorage
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}
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func New(coder Encoder, store keys.Storage) Manager {
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return Manager{
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es: encryptedStorage{
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coder: coder,
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store: store,
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},
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}
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}
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// exists just to make sure we fulfill the Signer interface
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func (s Manager) assertSigner() keys.Signer {
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return s
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}
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// exists just to make sure we fulfill the Manager interface
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func (s Manager) assertKeyManager() keys.Manager {
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return s
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}
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// Create adds a new key to the storage engine, returning error if
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// another key already stored under this name
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//
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// algo must be a supported go-crypto algorithm:
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//
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func (s Manager) Create(name, passphrase, algo string) (keys.Info, error) {
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gen, err := getGenerator(algo)
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if err != nil {
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return keys.Info{}, err
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}
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key := gen.Generate()
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err = s.es.Put(name, passphrase, key)
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return info(name, key), err
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}
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// List loads the keys from the storage and enforces alphabetical order
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func (s Manager) List() (keys.Infos, error) {
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res, err := s.es.List()
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res.Sort()
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return res, err
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}
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// Get returns the public information about one key
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func (s Manager) Get(name string) (keys.Info, error) {
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_, info, err := s.es.store.Get(name)
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return info, err
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}
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// Sign will modify the Signable in order to attach a valid signature with
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// this public key
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//
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// If no key for this name, or the passphrase doesn't match, returns an error
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func (s Manager) Sign(name, passphrase string, tx keys.Signable) error {
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key, _, err := s.es.Get(name, passphrase)
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if err != nil {
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return err
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}
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sig := key.Sign(tx.SignBytes())
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pubkey := key.PubKey()
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return tx.Sign(pubkey, sig)
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}
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// Export decodes the private key with the current password, encodes
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// it with a secure one-time password and generates a sequence that can be
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// Imported by another Manager
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//
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// This is designed to copy from one device to another, or provide backups
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// during version updates.
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func (s Manager) Export(name, oldpass, transferpass string) ([]byte, error) {
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key, _, err := s.es.Get(name, oldpass)
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if err != nil {
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return nil, err
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}
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res, err := s.es.coder.Encrypt(key, transferpass)
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return res, err
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}
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// Import accepts bytes generated by Export along with the same transferpass
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// If they are valid, it stores the password under the given name with the
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// new passphrase.
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func (s Manager) Import(name, newpass, transferpass string, data []byte) error {
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key, err := s.es.coder.Decrypt(data, transferpass)
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if err != nil {
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return err
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}
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return s.es.Put(name, newpass, key)
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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 (s Manager) Delete(name, passphrase string) error {
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// verify we have the proper password before deleting
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_, _, err := s.es.Get(name, passphrase)
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if err != nil {
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return err
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}
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return s.es.Delete(name)
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}
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// Update changes the passphrase with which a already stored key is encoded.
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//
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// oldpass must be the current passphrase used for encoding, newpass will be
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// the only valid passphrase from this time forward
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func (s Manager) Update(name, oldpass, newpass string) error {
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key, _, err := s.es.Get(name, oldpass)
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if err != nil {
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return err
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}
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// we must delete first, as Putting over an existing name returns an error
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s.Delete(name, oldpass)
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return s.es.Put(name, newpass, key)
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}
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