From 29a5a92d13cad45794c6e42cb97260a9ab9900ab Mon Sep 17 00:00:00 2001
From: Gustav Simonsson <gustav.simonsson@gmail.com>
Date: Wed, 15 Apr 2015 13:24:12 +0200
Subject: Add key header to encrypted keys

* Add key header containing key version, kdf and kdf params
* Store key header as JSON in the key file
* Read in KDF params from key header
* Include key header in MAC calculation and MAC verification
---
 crypto/key.go | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

(limited to 'crypto/key.go')

diff --git a/crypto/key.go b/crypto/key.go
index 5e1f3637e..067a5a294 100644
--- a/crypto/key.go
+++ b/crypto/key.go
@@ -48,17 +48,32 @@ type plainKeyJSON struct {
 	PrivateKey []byte
 }
 
+type encryptedKeyJSON struct {
+	Id      []byte
+	Address []byte
+	Crypto  cipherJSON
+}
+
 type cipherJSON struct {
 	MAC        []byte
 	Salt       []byte
 	IV         []byte
+	KeyHeader  keyHeaderJSON
 	CipherText []byte
 }
 
-type encryptedKeyJSON struct {
-	Id      []byte
-	Address []byte
-	Crypto  cipherJSON
+type keyHeaderJSON struct {
+	Version   string
+	Kdf       string
+	KdfParams scryptParamsJSON // TODO: make more generic?
+}
+
+type scryptParamsJSON struct {
+	N       int
+	R       int
+	P       int
+	DkLen   int
+	SaltLen int
 }
 
 func (k *Key) MarshalJSON() (j []byte, err error) {
-- 
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