Merge pull request #259 from Gustav-Simonsson/develop

KeyStore (Low level key functionality)

1 files changed, 107 insertions, 0 deletions

diff --git a/crypto/key.go b/crypto/key.go
new file mode 100644
index 000000000..d371ad4dc
--- /dev/null
+++ b/crypto/key.go
@@ -0,0 +1,107 @@
+/*
+	This file is part of go-ethereum
+
+	go-ethereum is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	go-ethereum is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with go-ethereum.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * @authors
+ * 	Gustav Simonsson <gustav.simonsson@gmail.com>
+ * @date 2015
+ *
+ */
+
+package crypto
+
+import (
+	"bytes"
+	"code.google.com/p/go-uuid/uuid"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"encoding/json"
+	"io"
+)
+
+type Key struct {
+	Id *uuid.UUID // Version 4 "random" for unique id not derived from key data
+	// we only store privkey as pubkey/address can be derived from it
+	// privkey in this struct is always in plaintext
+	PrivateKey *ecdsa.PrivateKey
+}
+
+type plainKeyJSON struct {
+	Id         []byte
+	PrivateKey []byte
+}
+
+type cipherJSON struct {
+	Salt       []byte
+	IV         []byte
+	CipherText []byte
+}
+
+type encryptedKeyJSON struct {
+	Id     []byte
+	Crypto cipherJSON
+}
+
+func (k *Key) Address() []byte {
+	pubBytes := FromECDSAPub(&k.PrivateKey.PublicKey)
+	return Sha3(pubBytes)[12:]
+}
+
+func (k *Key) MarshalJSON() (j []byte, err error) {
+	jStruct := plainKeyJSON{
+		*k.Id,
+		FromECDSA(k.PrivateKey),
+	}
+	j, err = json.Marshal(jStruct)
+	return j, err
+}
+
+func (k *Key) UnmarshalJSON(j []byte) (err error) {
+	keyJSON := new(plainKeyJSON)
+	err = json.Unmarshal(j, &keyJSON)
+	if err != nil {
+		return err
+	}
+
+	u := new(uuid.UUID)
+	*u = keyJSON.Id
+	k.Id = u
+
+	k.PrivateKey = ToECDSA(keyJSON.PrivateKey)
+
+	return err
+}
+
+func NewKey(rand io.Reader) *Key {
+	randBytes := make([]byte, 32)
+	_, err := rand.Read(randBytes)
+	if err != nil {
+		panic("key generation: could not read from random source: " + err.Error())
+	}
+	reader := bytes.NewReader(randBytes)
+	_, x, y, err := elliptic.GenerateKey(S256(), reader)
+	if err != nil {
+		panic("key generation: elliptic.GenerateKey failed: " + err.Error())
+	}
+	privateKeyMarshalled := elliptic.Marshal(S256(), x, y)
+	privateKeyECDSA := ToECDSA(privateKeyMarshalled)
+
+	key := new(Key)
+	id := uuid.NewRandom()
+	key.Id = &id
+	key.PrivateKey = privateKeyECDSA
+	return key
+}