1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
|
/*
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
*
*/
/*
This abstracts part of a user's interaction with an account she controls.
It's not an abstraction of core Ethereum accounts data type / logic -
for that see the core processing code of blocks / txs.
Currently this is pretty much a passthrough to the KeyStore2 interface,
and accounts persistence is derived from stored keys' addresses
*/
package accounts
import (
crand "crypto/rand"
"errors"
"sync"
"time"
"github.com/ethereum/go-ethereum/crypto"
)
var ErrLocked = errors.New("account is locked; please request passphrase")
// TODO: better name for this struct?
type Account struct {
Address []byte
}
type AccountManager struct {
keyStore crypto.KeyStore2
unlockedKeys map[string]crypto.Key
unlockMilliseconds time.Duration
mutex sync.RWMutex
}
func NewAccountManager(keyStore crypto.KeyStore2, unlockMilliseconds time.Duration) AccountManager {
keysMap := make(map[string]crypto.Key)
am := &AccountManager{
keyStore: keyStore,
unlockedKeys: keysMap,
unlockMilliseconds: unlockMilliseconds,
}
return *am
}
func (am AccountManager) DeleteAccount(address []byte, auth string) error {
return am.keyStore.DeleteKey(address, auth)
}
func (am *AccountManager) Sign(fromAccount *Account, toSign []byte) (signature []byte, err error) {
am.mutex.RLock()
unlockedKey := am.unlockedKeys[string(fromAccount.Address)]
am.mutex.RUnlock()
if unlockedKey.Address == nil {
return nil, ErrLocked
}
signature, err = crypto.Sign(toSign, unlockedKey.PrivateKey)
return signature, err
}
func (am *AccountManager) SignLocked(fromAccount *Account, keyAuth string, toSign []byte) (signature []byte, err error) {
key, err := am.keyStore.GetKey(fromAccount.Address, keyAuth)
if err != nil {
return nil, err
}
am.mutex.RLock()
am.unlockedKeys[string(fromAccount.Address)] = *key
am.mutex.RUnlock()
go unlockLater(am, fromAccount.Address)
signature, err = crypto.Sign(toSign, key.PrivateKey)
return signature, err
}
func (am AccountManager) NewAccount(auth string) (*Account, error) {
key, err := am.keyStore.GenerateNewKey(crand.Reader, auth)
if err != nil {
return nil, err
}
ua := &Account{
Address: key.Address,
}
return ua, err
}
func (am *AccountManager) Accounts() ([]Account, error) {
addresses, err := am.keyStore.GetKeyAddresses()
if err != nil {
return nil, err
}
accounts := make([]Account, len(addresses))
for i, addr := range addresses {
accounts[i] = Account{
Address: addr,
}
}
return accounts, err
}
func unlockLater(am *AccountManager, addr []byte) {
select {
case <-time.After(time.Millisecond * am.unlockMilliseconds):
}
am.mutex.RLock()
// TODO: how do we know the key is actually gone from memory?
delete(am.unlockedKeys, string(addr))
am.mutex.RUnlock()
}
|
