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
|
// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package evm
import (
"errors"
"fmt"
"github.com/ava-labs/coreth/core/state"
"github.com/ava-labs/avalanchego/database"
"github.com/ava-labs/avalanchego/ids"
"github.com/ava-labs/avalanchego/snow"
"github.com/ava-labs/avalanchego/utils/codec"
"github.com/ava-labs/avalanchego/utils/crypto"
"github.com/ava-labs/avalanchego/utils/hashing"
"github.com/ava-labs/avalanchego/vms/components/verify"
"github.com/ava-labs/avalanchego/vms/secp256k1fx"
"github.com/ethereum/go-ethereum/common"
)
// Max size of memo field
// Don't change without also changing avm.maxMemoSize
const maxMemoSize = 256
var (
errWrongBlockchainID = errors.New("wrong blockchain ID provided")
errWrongNetworkID = errors.New("tx was issued with a different network ID")
errNilTx = errors.New("tx is nil")
)
type EVMOutput struct {
Address common.Address `serialize:"true" json:"address"`
Amount uint64 `serialize:"true" json:"amount"`
Nonce uint64 `serialize:"true" json:"nonce"`
}
func (out *EVMOutput) Verify() error {
return nil
}
type EVMInput EVMOutput
func (in *EVMInput) Verify() error {
return nil
}
// UnsignedTx is an unsigned transaction
type UnsignedTx interface {
Initialize(unsignedBytes, signedBytes []byte)
ID() ids.ID
UnsignedBytes() []byte
Bytes() []byte
}
// UnsignedAtomicTx is an unsigned operation that can be atomically accepted
type UnsignedAtomicTx interface {
UnsignedTx
// UTXOs this tx consumes
InputUTXOs() ids.Set
// Attempts to verify this transaction with the provided state.
SemanticVerify(vm *VM, stx *Tx) TxError
// Accept this transaction with the additionally provided state transitions.
Accept(ctx *snow.Context, batch database.Batch) error
EVMStateTransfer(state *state.StateDB) error
}
// Tx is a signed transaction
type Tx struct {
// The body of this transaction
UnsignedTx `serialize:"true" json:"unsignedTx"`
// The credentials of this transaction
Creds []verify.Verifiable `serialize:"true" json:"credentials"`
}
// (*secp256k1fx.Credential)
// Sign this transaction with the provided signers
func (tx *Tx) Sign(c codec.Codec, signers [][]*crypto.PrivateKeySECP256K1R) error {
unsignedBytes, err := c.Marshal(&tx.UnsignedTx)
if err != nil {
return fmt.Errorf("couldn't marshal UnsignedTx: %w", err)
}
// Attach credentials
hash := hashing.ComputeHash256(unsignedBytes)
for _, keys := range signers {
cred := &secp256k1fx.Credential{
Sigs: make([][crypto.SECP256K1RSigLen]byte, len(keys)),
}
for i, key := range keys {
sig, err := key.SignHash(hash) // Sign hash
if err != nil {
return fmt.Errorf("problem generating credential: %w", err)
}
copy(cred.Sigs[i][:], sig)
}
tx.Creds = append(tx.Creds, cred) // Attach credential
}
signedBytes, err := c.Marshal(tx)
if err != nil {
return fmt.Errorf("couldn't marshal ProposalTx: %w", err)
}
tx.Initialize(unsignedBytes, signedBytes)
return nil
}
|