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29a5a92d13
* 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
129 lines
2.9 KiB
Go
129 lines
2.9 KiB
Go
/*
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This file is part of go-ethereum
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go-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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go-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @authors
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* Gustav Simonsson <gustav.simonsson@gmail.com>
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* @date 2015
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*
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*/
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package crypto
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import (
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"bytes"
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"crypto/ecdsa"
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"encoding/json"
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"io"
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"code.google.com/p/go-uuid/uuid"
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"github.com/ethereum/go-ethereum/common"
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)
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type Key struct {
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Id uuid.UUID // Version 4 "random" for unique id not derived from key data
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// to simplify lookups we also store the address
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Address common.Address
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// we only store privkey as pubkey/address can be derived from it
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// privkey in this struct is always in plaintext
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PrivateKey *ecdsa.PrivateKey
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}
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type plainKeyJSON struct {
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Id []byte
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Address []byte
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PrivateKey []byte
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}
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type encryptedKeyJSON struct {
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Id []byte
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Address []byte
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Crypto cipherJSON
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}
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type cipherJSON struct {
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MAC []byte
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Salt []byte
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IV []byte
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KeyHeader keyHeaderJSON
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CipherText []byte
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}
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type keyHeaderJSON struct {
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Version string
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Kdf string
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KdfParams scryptParamsJSON // TODO: make more generic?
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}
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type scryptParamsJSON struct {
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N int
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R int
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P int
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DkLen int
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SaltLen int
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}
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func (k *Key) MarshalJSON() (j []byte, err error) {
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jStruct := plainKeyJSON{
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k.Id,
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k.Address.Bytes(),
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FromECDSA(k.PrivateKey),
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}
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j, err = json.Marshal(jStruct)
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return j, err
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}
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func (k *Key) UnmarshalJSON(j []byte) (err error) {
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keyJSON := new(plainKeyJSON)
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err = json.Unmarshal(j, &keyJSON)
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if err != nil {
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return err
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}
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u := new(uuid.UUID)
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*u = keyJSON.Id
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k.Id = *u
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k.Address = common.BytesToAddress(keyJSON.Address)
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k.PrivateKey = ToECDSA(keyJSON.PrivateKey)
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return err
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}
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func NewKeyFromECDSA(privateKeyECDSA *ecdsa.PrivateKey) *Key {
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id := uuid.NewRandom()
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key := &Key{
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Id: id,
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Address: common.BytesToAddress(PubkeyToAddress(privateKeyECDSA.PublicKey)),
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PrivateKey: privateKeyECDSA,
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}
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return key
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}
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func NewKey(rand io.Reader) *Key {
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randBytes := make([]byte, 64)
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_, err := rand.Read(randBytes)
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if err != nil {
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panic("key generation: could not read from random source: " + err.Error())
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}
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reader := bytes.NewReader(randBytes)
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privateKeyECDSA, err := ecdsa.GenerateKey(S256(), reader)
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if err != nil {
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panic("key generation: ecdsa.GenerateKey failed: " + err.Error())
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}
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return NewKeyFromECDSA(privateKeyECDSA)
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}
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