-
Notifications
You must be signed in to change notification settings - Fork 0
/
ethsecp256k1.go
217 lines (177 loc) · 6.11 KB
/
ethsecp256k1.go
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
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
package ethsecp256k1
import (
"bytes"
"crypto/ecdsa"
"crypto/subtle"
"fmt"
"github.com/ethereum/go-ethereum/crypto"
"github.com/reapchain/cosmos-sdk/codec"
cryptotypes "github.com/reapchain/cosmos-sdk/crypto/types"
sdkerrors "github.com/reapchain/cosmos-sdk/types/errors"
tmcrypto "github.com/reapchain/reapchain-core/crypto"
)
const (
// PrivKeySize defines the size of the PrivKey bytes
PrivKeySize = 32
// PubKeySize defines the size of the PubKey bytes
PubKeySize = 33
// KeyType is the string constant for the Secp256k1 algorithm
KeyType = "eth_secp256k1"
)
// Amino encoding names
const (
// PrivKeyName defines the amino encoding name for the EthSecp256k1 private key
PrivKeyName = "ethermint/PrivKeyEthSecp256k1"
// PubKeyName defines the amino encoding name for the EthSecp256k1 public key
PubKeyName = "ethermint/PubKeyEthSecp256k1"
)
// ----------------------------------------------------------------------------
// secp256k1 Private Key
var (
_ cryptotypes.PrivKey = &PrivKey{}
_ codec.AminoMarshaler = &PrivKey{}
)
// GenerateKey generates a new random private key. It returns an error upon
// failure.
func GenerateKey() (*PrivKey, error) {
priv, err := crypto.GenerateKey()
if err != nil {
return nil, err
}
return &PrivKey{
Key: crypto.FromECDSA(priv),
}, nil
}
// Bytes returns the byte representation of the ECDSA Private Key.
func (privKey PrivKey) Bytes() []byte {
bz := make([]byte, len(privKey.Key))
copy(bz, privKey.Key)
return bz
}
// PubKey returns the ECDSA private key's public key. If the privkey is not valid
// it returns a nil value.
func (privKey PrivKey) PubKey() cryptotypes.PubKey {
ecdsaPrivKey, err := privKey.ToECDSA()
if err != nil {
return nil
}
return &PubKey{
Key: crypto.CompressPubkey(&ecdsaPrivKey.PublicKey),
}
}
// Equals returns true if two ECDSA private keys are equal and false otherwise.
func (privKey PrivKey) Equals(other cryptotypes.LedgerPrivKey) bool {
return privKey.Type() == other.Type() && subtle.ConstantTimeCompare(privKey.Bytes(), other.Bytes()) == 1
}
// Type returns eth_secp256k1
func (privKey PrivKey) Type() string {
return KeyType
}
// MarshalAmino overrides Amino binary marshaling.
func (privKey PrivKey) MarshalAmino() ([]byte, error) {
return privKey.Key, nil
}
// UnmarshalAmino overrides Amino binary marshaling.
func (privKey *PrivKey) UnmarshalAmino(bz []byte) error {
if len(bz) != PrivKeySize {
return fmt.Errorf("invalid privkey size, expected %d got %d", PrivKeySize, len(bz))
}
privKey.Key = bz
return nil
}
// MarshalAminoJSON overrides Amino JSON marshaling.
func (privKey PrivKey) MarshalAminoJSON() ([]byte, error) {
// When we marshal to Amino JSON, we don't marshal the "key" field itself,
// just its contents (i.e. the key bytes).
return privKey.MarshalAmino()
}
// UnmarshalAminoJSON overrides Amino JSON marshaling.
func (privKey *PrivKey) UnmarshalAminoJSON(bz []byte) error {
return privKey.UnmarshalAmino(bz)
}
// Sign creates a recoverable ECDSA signature on the secp256k1 curve over the
// provided hash of the message. The produced signature is 65 bytes
// where the last byte contains the recovery ID.
func (privKey PrivKey) Sign(digestBz []byte) ([]byte, error) {
// TODO: remove
if len(digestBz) != crypto.DigestLength {
digestBz = crypto.Keccak256Hash(digestBz).Bytes()
}
key, err := privKey.ToECDSA()
if err != nil {
return nil, err
}
return crypto.Sign(digestBz, key)
}
// ToECDSA returns the ECDSA private key as a reference to ecdsa.PrivateKey type.
func (privKey PrivKey) ToECDSA() (*ecdsa.PrivateKey, error) {
return crypto.ToECDSA(privKey.Bytes())
}
// ----------------------------------------------------------------------------
// secp256k1 Public Key
var (
_ cryptotypes.PubKey = &PubKey{}
_ codec.AminoMarshaler = &PubKey{}
)
// Address returns the address of the ECDSA public key.
// The function will return an empty address if the public key is invalid.
func (pubKey PubKey) Address() tmcrypto.Address {
pubk, err := crypto.DecompressPubkey(pubKey.Key)
if err != nil {
return nil
}
return tmcrypto.Address(crypto.PubkeyToAddress(*pubk).Bytes())
}
// Bytes returns the raw bytes of the ECDSA public key.
func (pubKey PubKey) Bytes() []byte {
bz := make([]byte, len(pubKey.Key))
copy(bz, pubKey.Key)
return bz
}
// String implements the fmt.Stringer interface.
func (pubKey PubKey) String() string {
return fmt.Sprintf("EthPubKeySecp256k1{%X}", pubKey.Key)
}
// Type returns eth_secp256k1
func (pubKey PubKey) Type() string {
return KeyType
}
// Equals returns true if the pubkey type is the same and their bytes are deeply equal.
func (pubKey PubKey) Equals(other cryptotypes.PubKey) bool {
return pubKey.Type() == other.Type() && bytes.Equal(pubKey.Bytes(), other.Bytes())
}
// MarshalAmino overrides Amino binary marshaling.
func (pubKey PubKey) MarshalAmino() ([]byte, error) {
return pubKey.Key, nil
}
// UnmarshalAmino overrides Amino binary marshaling.
func (pubKey *PubKey) UnmarshalAmino(bz []byte) error {
if len(bz) != PubKeySize {
return sdkerrors.Wrapf(sdkerrors.ErrInvalidPubKey, "invalid pubkey size, expected %d, got %d", PubKeySize, len(bz))
}
pubKey.Key = bz
return nil
}
// MarshalAminoJSON overrides Amino JSON marshaling.
func (pubKey PubKey) MarshalAminoJSON() ([]byte, error) {
// When we marshal to Amino JSON, we don't marshal the "key" field itself,
// just its contents (i.e. the key bytes).
return pubKey.MarshalAmino()
}
// UnmarshalAminoJSON overrides Amino JSON marshaling.
func (pubKey *PubKey) UnmarshalAminoJSON(bz []byte) error {
return pubKey.UnmarshalAmino(bz)
}
// VerifySignature verifies that the ECDSA public key created a given signature over
// the provided message. It will calculate the Keccak256 hash of the message
// prior to verification.
//
// CONTRACT: The signature should be in [R || S] format.
func (pubKey PubKey) VerifySignature(msg, sig []byte) bool {
if len(sig) == crypto.SignatureLength {
// remove recovery ID (V) if contained in the signature
sig = sig[:len(sig)-1]
}
// the signature needs to be in [R || S] format when provided to VerifySignature
return crypto.VerifySignature(pubKey.Key, crypto.Keccak256Hash(msg).Bytes(), sig)
}