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keystore.go
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keystore.go
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// Copyright (c) 2015 Mute Communications Ltd.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cryptengine
import (
"database/sql"
"github.com/mutecomm/mute/encode/base64"
"github.com/mutecomm/mute/log"
"github.com/mutecomm/mute/msg/session"
"github.com/mutecomm/mute/uid"
"github.com/mutecomm/mute/util"
)
// GetSessionState implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) GetSessionState(sessionStateKey string) (
*session.State,
error,
) {
ss, err := ce.keyDB.GetSessionState(sessionStateKey)
if err != nil {
return nil, err
}
return ss, nil
}
// SetSessionState implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) SetSessionState(
sessionStateKey string,
sessionState *session.State,
) error {
return ce.keyDB.SetSessionState(sessionStateKey, sessionState)
}
// StoreSession implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) StoreSession(
sessionKey, rootKeyHash, chainKey string,
send, recv []string,
) error {
return ce.keyDB.AddSession(sessionKey, rootKeyHash, chainKey, send, recv)
}
// HasSession implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) HasSession(sessionKey string) bool {
_, _, _, err := ce.keyDB.GetSession(sessionKey)
switch {
case err == sql.ErrNoRows:
return false
case err != nil:
// TODO: handle this without panic!
panic(log.Critical(err))
}
return true
}
// GetPrivateKeyEntry implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) GetPrivateKeyEntry(pubKeyHash string) (*uid.KeyEntry, error) {
log.Debugf("ce.FindKeyEntry: pubKeyHash=%s", pubKeyHash)
ki, sigPubKey, privateKey, err := ce.keyDB.GetPrivateKeyInit(pubKeyHash)
if err != nil {
if err == sql.ErrNoRows {
return nil, session.ErrNoKeyEntry
}
return nil, err
}
// decrypt KeyEntry
ke, err := ki.KeyEntryECDHE25519(sigPubKey)
if err != nil {
return nil, err
}
// set private key
if err := ke.SetPrivateKey(privateKey); err != nil {
return nil, err
}
return ke, nil
}
// GetPublicKeyEntry implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) GetPublicKeyEntry(uidMsg *uid.Message) (*uid.KeyEntry, string, error) {
log.Debugf("ce.FindKeyEntry: uidMsg.Identity()=%s", uidMsg.Identity())
// get KeyInit
sigKeyHash, err := uidMsg.SigKeyHash()
if err != nil {
return nil, "", err
}
ki, err := ce.keyDB.GetPublicKeyInit(sigKeyHash)
if err != nil {
if err == sql.ErrNoRows {
return nil, "", session.ErrNoKeyEntry
}
return nil, "", err
}
// decrypt SessionAnchor
sa, err := ki.SessionAnchor(uidMsg.SigPubKey())
if err != nil {
return nil, "", err
}
// get KeyEntry message from SessionAnchor
ke, err := sa.KeyEntry("ECDHE25519")
if err != nil {
return nil, "", err
}
return ke, sa.NymAddress(), nil
}
// GetMessageKey implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) GetMessageKey(
sessionKey string,
sender bool,
msgIndex uint64,
) (*[64]byte, error) {
key, err := ce.keyDB.GetMessageKey(sessionKey, sender, msgIndex)
if err != nil {
return nil, err
}
// decode key
var messageKey [64]byte
k, err := base64.Decode(key)
if err != nil {
return nil,
log.Errorf("cryptengine: cannot decode key for %s", sessionKey)
}
if copy(messageKey[:], k) != 64 {
return nil,
log.Errorf("cryptengine: key for %s has wrong length", sessionKey)
}
return &messageKey, nil
}
// NumMessageKeys implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) NumMessageKeys(sessionKey string) (uint64, error) {
_, _, n, err := ce.keyDB.GetSession(sessionKey)
if err != nil {
return 0, err
}
return n, nil
}
// GetRootKeyHash implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) GetRootKeyHash(sessionKey string) (*[64]byte, error) {
rootKeyHash, _, _, err := ce.keyDB.GetSession(sessionKey)
if err != nil {
return nil, err
}
// decode root key hash
var hash [64]byte
k, err := base64.Decode(rootKeyHash)
if err != nil {
return nil, log.Error("cryptengine: cannot decode root key hash")
}
if copy(hash[:], k) != 64 {
return nil, log.Errorf("cryptengine: root key hash has wrong length")
}
return &hash, nil
}
// GetChainKey implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) GetChainKey(sessionKey string) (*[32]byte, error) {
_, chainKey, _, err := ce.keyDB.GetSession(sessionKey)
if err != nil {
return nil, err
}
// decode chain key
var key [32]byte
k, err := base64.Decode(chainKey)
if err != nil {
return nil, log.Error("cryptengine: cannot decode chain key")
}
if copy(key[:], k) != 32 {
return nil, log.Errorf("cryptengine: chain key has wrong length")
}
return &key, nil
}
// DelMessageKey implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) DelMessageKey(
sessionKey string,
sender bool,
msgIndex uint64,
) error {
return ce.keyDB.DelMessageKey(sessionKey, sender, msgIndex)
}
// AddSessionKey implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) AddSessionKey(
hash, json, privKey string,
cleanupTime uint64,
) error {
return ce.keyDB.AddSessionKey(hash, json, privKey, cleanupTime)
}
// GetSessionKey implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) GetSessionKey(hash string) (
json, privKey string,
err error,
) {
json, privKey, err = ce.keyDB.GetSessionKey(hash)
switch {
case err == sql.ErrNoRows:
return "", "", log.Error(session.ErrNoKeyEntry)
case err != nil:
return "", "", err
}
return
}
// DelPrivSessionKey implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) DelPrivSessionKey(hash string) error {
return ce.keyDB.DelPrivSessionKey(hash)
}
// CleanupSessionKeys implements corresponding method for msg.KeyStore interface.
func (ce *CryptEngine) CleanupSessionKeys(t uint64) error {
return util.ErrNotImplemented
}