1 files changed, 21 insertions, 0 deletions
diff --git a/xeth/xeth.go b/xeth/xeth.go
index b875fa6f1..06cd9dc1b 100644
--- a/xeth/xeth.go
+++ b/xeth/xeth.go
@@ -815,6 +815,27 @@ func (self *XEth) ConfirmTransaction(tx string) bool {
 	return self.frontend.ConfirmTransaction(tx)
 }
 
+func (self *XEth) Sign(fromStr, hashStr string, didUnlock bool) (string, error) {
+	var (
+		from = common.HexToAddress(fromStr)
+		hash = common.HexToHash(hashStr)
+	)
+	sig, err := self.backend.AccountManager().Sign(accounts.Account{Address: from.Bytes()}, hash.Bytes())
+	if err == accounts.ErrLocked {
+		if didUnlock {
+			return "", fmt.Errorf("signer account still locked after successful unlock")
+		}
+		if !self.frontend.UnlockAccount(from.Bytes()) {
+			return "", fmt.Errorf("could not unlock signer account")
+		}
+		// retry signing, the account should now be unlocked.
+		return self.Sign(fromStr, hashStr, true)
+	} else if err != nil {
+		return "", err
+	}
+	return common.ToHex(sig), nil
+}
+
 func (self *XEth) Transact(fromStr, toStr, nonceStr, valueStr, gasStr, gasPriceStr, codeStr string) (string, error) {
 
 	// this minimalistic recoding is enough (works for natspec.js)