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-rw-r--r--crypto/key.go107
1 files changed, 107 insertions, 0 deletions
diff --git a/crypto/key.go b/crypto/key.go
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+++ 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
+}