aboutsummaryrefslogtreecommitdiffstats
path: root/core/authenticator.go
blob: 5415f967c9b9e05503e58ec1d0b71c87697d6975 (plain) (blame)
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
133
134
135
136
137
138
139
140
141
// 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
    proposerID types.NodeID
}

// NewAuthenticator constructs an Authenticator instance.
func NewAuthenticator(prvKey crypto.PrivateKey) (auth *Authenticator) {
    auth = &Authenticator{
        prvKey: prvKey,
        pubKey: prvKey.PublicKey(),
    }
    auth.proposerID = types.NewNodeID(auth.pubKey)
    return
}

// SignBlock signs a types.Block.
func (au *Authenticator) SignBlock(b *types.Block) (err error) {
    b.ProposerID = au.proposerID
    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 = au.proposerID
    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 != au.proposerID {
        err = ErrInvalidProposerID
        return
    }
    b.CRSSignature, err = au.prvKey.Sign(hashCRS(b, crs))
    return
}

// SignDKGComplaint signs a DKG complaint.
func (au *Authenticator) SignDKGComplaint(
    complaint *types.DKGComplaint) (err error) {
    complaint.ProposerID = au.proposerID
    complaint.Signature, err = au.prvKey.Sign(hashDKGComplaint(complaint))
    return
}

// SignDKGMasterPublicKey signs a DKG master public key.
func (au *Authenticator) SignDKGMasterPublicKey(
    mpk *types.DKGMasterPublicKey) (err error) {
    mpk.ProposerID = au.proposerID
    mpk.Signature, err = au.prvKey.Sign(hashDKGMasterPublicKey(mpk))
    return
}

// SignDKGPrivateShare signs a DKG private share.
func (au *Authenticator) SignDKGPrivateShare(
    prvShare *types.DKGPrivateShare) (err error) {
    prvShare.ProposerID = au.proposerID
    prvShare.Signature, err = au.prvKey.Sign(hashDKGPrivateShare(prvShare))
    return
}

// SignDKGPartialSignature signs a DKG partial signature.
func (au *Authenticator) SignDKGPartialSignature(
    pSig *types.DKGPartialSignature) (err error) {
    pSig.ProposerID = au.proposerID
    pSig.Signature, err = au.prvKey.Sign(hashDKGPartialSignature(pSig))
    return
}

// SignDKGFinalize signs a DKG finalize message.
func (au *Authenticator) SignDKGFinalize(
    final *types.DKGFinalize) (err error) {
    final.ProposerID = au.proposerID
    final.Signature, err = au.prvKey.Sign(hashDKGFinalize(final))
    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(types.NewNodeID(pubKey)) {
        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)
}