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
|
// Copyright 2018 The dexon-consensus-core Authors
// This file is part of the dexon-consensus-core library.
//
// The dexon-consensus-core library 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.
//
// The dexon-consensus-core library 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 Lesser
// General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the dexon-consensus-core library. If not, see
// <http://www.gnu.org/licenses/>.
package core
import (
"github.com/dexon-foundation/dexon-consensus-core/common"
"github.com/dexon-foundation/dexon-consensus-core/core/crypto"
"github.com/dexon-foundation/dexon-consensus-core/core/types"
)
// Authenticator verify data owner.
type Authenticator struct {
prvKey crypto.PrivateKey
pubKey crypto.PublicKey
}
// NewAuthenticator constructs an Authenticator instance.
func NewAuthenticator(prvKey crypto.PrivateKey) *Authenticator {
return &Authenticator{
prvKey: prvKey,
pubKey: prvKey.PublicKey(),
}
}
// SignBlock signs a types.Block.
func (au *Authenticator) SignBlock(b *types.Block) (err error) {
b.ProposerID = types.NewNodeID(au.pubKey)
if b.Hash, err = hashBlock(b); err != nil {
return
}
if b.Signature, err = au.prvKey.Sign(b.Hash); err != nil {
return
}
return
}
// SignVote signs a types.Vote.
func (au *Authenticator) SignVote(v *types.Vote) (err error) {
v.ProposerID = types.NewNodeID(au.pubKey)
v.Signature, err = au.prvKey.Sign(hashVote(v))
return
}
// SignCRS signs CRS signature of types.Block.
func (au *Authenticator) SignCRS(b *types.Block, crs common.Hash) (err error) {
if b.ProposerID != types.NewNodeID(au.pubKey) {
err = ErrInvalidProposerID
return
}
b.CRSSignature, err = au.prvKey.Sign(hashCRS(b, crs))
return
}
// VerifyBlock verifies the signature of types.Block.
func (au *Authenticator) VerifyBlock(b *types.Block) (err error) {
hash, err := hashBlock(b)
if err != nil {
return
}
if hash != b.Hash {
err = ErrIncorrectHash
return
}
pubKey, err := crypto.SigToPub(b.Hash, b.Signature)
if err != nil {
return
}
if !b.ProposerID.Equal(crypto.Keccak256Hash(pubKey.Bytes())) {
err = ErrIncorrectSignature
return
}
return
}
// VerifyVote verifies the signature of types.Vote.
func (au *Authenticator) VerifyVote(v *types.Vote) (bool, error) {
return verifyVoteSignature(v)
}
// VerifyCRS verifies the CRS signature of types.Block.
func (au *Authenticator) VerifyCRS(b *types.Block, crs common.Hash) (bool, error) {
return verifyCRSSignature(b, crs)
}
|
