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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"
"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
}
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