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/*
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"
"crypto/ecdsa"
"encoding/hex"
"encoding/json"
"io"
"code.google.com/p/go-uuid/uuid"
"github.com/ethereum/go-ethereum/common"
)
const (
version = "1"
)
type Key struct {
Id uuid.UUID // Version 4 "random" for unique id not derived from key data
// to simplify lookups we also store the address
Address common.Address
// 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 {
Version string
Id string
Address string
PrivateKey string
}
type encryptedKeyJSON struct {
Version string
Id string
Address string
Crypto cipherJSON
}
type cipherJSON struct {
MAC string
Salt string
IV string
KeyHeader keyHeaderJSON
CipherText string
}
type keyHeaderJSON struct {
Version string
Kdf string
KdfParams scryptParamsJSON
}
type scryptParamsJSON struct {
N int
R int
P int
DkLen int
SaltLen int
}
func (k *Key) MarshalJSON() (j []byte, err error) {
jStruct := plainKeyJSON{
version,
k.Id.String(),
hex.EncodeToString(k.Address[:]),
hex.EncodeToString(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 = uuid.Parse(keyJSON.Id)
k.Id = *u
addr, err := hex.DecodeString(keyJSON.Address)
if err != nil {
return err
}
privkey, err := hex.DecodeString(keyJSON.PrivateKey)
if err != nil {
return err
}
k.Address = common.BytesToAddress(addr)
k.PrivateKey = ToECDSA(privkey)
return nil
}
func NewKeyFromECDSA(privateKeyECDSA *ecdsa.PrivateKey) *Key {
id := uuid.NewRandom()
key := &Key{
Id: id,
Address: common.BytesToAddress(PubkeyToAddress(privateKeyECDSA.PublicKey)),
PrivateKey: privateKeyECDSA,
}
return key
}
func NewKey(rand io.Reader) *Key {
randBytes := make([]byte, 64)
_, err := rand.Read(randBytes)
if err != nil {
panic("key generation: could not read from random source: " + err.Error())
}
reader := bytes.NewReader(randBytes)
privateKeyECDSA, err := ecdsa.GenerateKey(S256(), reader)
if err != nil {
panic("key generation: ecdsa.GenerateKey failed: " + err.Error())
}
return NewKeyFromECDSA(privateKeyECDSA)
}
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