From da4a0e05555fdcbf3e561b4c7bb93964f7d417f3 Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Sun, 19 Apr 2015 01:28:41 +0200
Subject: eth: fix node key persistence

crypto.LoadECDSA has been modified to expect hex data.
The key was being saved as raw bytes, causing the file
to be rewritten on every start.
---
 eth/backend.go | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/eth/backend.go b/eth/backend.go
index 7799326fe..264753aba 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -3,7 +3,6 @@ package eth
 import (
 	"crypto/ecdsa"
 	"fmt"
-	"io/ioutil"
 	"math"
 	"path"
 	"strings"
@@ -110,7 +109,7 @@ func (cfg *Config) nodeKey() (*ecdsa.PrivateKey, error) {
 	if key, err = crypto.GenerateKey(); err != nil {
 		return nil, fmt.Errorf("could not generate server key: %v", err)
 	}
-	if err := ioutil.WriteFile(keyfile, crypto.FromECDSA(key), 0600); err != nil {
+	if err := crypto.SaveECDSA(keyfile, key); err != nil {
 		glog.V(logger.Error).Infoln("could not persist nodekey: ", err)
 	}
 	return key, nil
@@ -223,12 +222,10 @@ func New(config *Config) (*Ethereum, error) {
 	if err != nil {
 		return nil, err
 	}
-
 	protocols := []p2p.Protocol{eth.protocolManager.SubProtocol}
 	if config.Shh {
 		protocols = append(protocols, eth.whisper.Protocol())
 	}
-
 	eth.net = &p2p.Server{
 		PrivateKey:     netprv,
 		Name:           config.Name,
-- 
cgit v1.2.3


From 4907d28967a890628f4dd014be2e7e1fbd8f4d04 Mon Sep 17 00:00:00 2001
From: Felix Lange <fjl@twurst.com>
Date: Sun, 19 Apr 2015 01:33:00 +0200
Subject: crypto: update {Load,Save}ECDSA comments to mention hex encoding

---
 crypto/crypto.go | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/crypto/crypto.go b/crypto/crypto.go
index 9865c87c4..89423e0c4 100644
--- a/crypto/crypto.go
+++ b/crypto/crypto.go
@@ -120,6 +120,7 @@ func HexToECDSA(hexkey string) (*ecdsa.PrivateKey, error) {
 }
 
 // LoadECDSA loads a secp256k1 private key from the given file.
+// The key data is expected to be hex-encoded.
 func LoadECDSA(file string) (*ecdsa.PrivateKey, error) {
 	buf := make([]byte, 64)
 	fd, err := os.Open(file)
@@ -139,8 +140,8 @@ func LoadECDSA(file string) (*ecdsa.PrivateKey, error) {
 	return ToECDSA(key), nil
 }
 
-// SaveECDSA saves a secp256k1 private key to the given file with restrictive
-// permissions
+// SaveECDSA saves a secp256k1 private key to the given file with
+// restrictive permissions. The key data is saved hex-encoded.
 func SaveECDSA(file string, key *ecdsa.PrivateKey) error {
 	k := hex.EncodeToString(FromECDSA(key))
 	return ioutil.WriteFile(file, []byte(k), 0600)
-- 
cgit v1.2.3