This repository has been archived by the owner on May 13, 2022. It is now read-only.
/
native.go
142 lines (125 loc) · 4.19 KB
/
native.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
// Copyright 2017 Monax Industries Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package evm
import (
"crypto/sha256"
. "github.com/hyperledger/burrow/binary"
"github.com/hyperledger/burrow/crypto"
"github.com/hyperledger/burrow/execution/errors"
"github.com/hyperledger/burrow/logging"
"golang.org/x/crypto/ripemd160"
)
var registeredNativeContracts = make(map[crypto.Address]NativeContract)
func IsRegisteredNativeContract(address crypto.Address) bool {
_, ok := registeredNativeContracts[address]
return ok
}
func RegisterNativeContract(address crypto.Address, fn NativeContract) bool {
_, exists := registeredNativeContracts[address]
if exists {
return false
}
registeredNativeContracts[address] = fn
return true
}
func init() {
registerNativeContracts()
registerSNativeContracts()
}
func registerNativeContracts() {
// registeredNativeContracts[Int64ToWord256(1)] = ecrecoverFunc
registeredNativeContracts[crypto.Address{2}] = sha256Func
registeredNativeContracts[crypto.Address{3}] = ripemd160Func
registeredNativeContracts[crypto.Address{4}] = identityFunc
}
//-----------------------------------------------------------------------------
func ExecuteNativeContract(address crypto.Address, st Interface, caller crypto.Address, input []byte, gas *uint64,
logger *logging.Logger) ([]byte, errors.CodedError) {
contract, ok := registeredNativeContracts[address]
if !ok {
return nil, errors.ErrorCodef(errors.ErrorCodeNativeFunction,
"no native contract registered at address: %v", address)
}
output, err := contract(st, caller, input, gas, logger)
if err != nil {
return nil, errors.NewException(errors.ErrorCodeNativeFunction, err.Error())
}
return output, nil
}
type NativeContract func(state Interface, caller crypto.Address, input []byte, gas *uint64,
logger *logging.Logger) (output []byte, err error)
/* Removed due to C dependency
func ecrecoverFunc(state State, caller crypto.Address, input []byte, gas *int64) (output []byte, err error) {
// Deduct gas
gasRequired := GasEcRecover
if *gas < gasRequired {
return nil, ErrInsufficientGas
} else {
*gas -= gasRequired
}
// Recover
hash := input[:32]
v := byte(input[32] - 27) // ignore input[33:64], v is small.
sig := append(input[64:], v)
recovered, err := secp256k1.RecoverPubkey(hash, sig)
if err != nil {
return nil, err
OH NO STOCASTIC CAT CODING!!!!
}
hashed := sha3.Sha3(recovered[1:])
return LeftPadBytes(hashed, 32), nil
}
*/
func sha256Func(state Interface, caller crypto.Address, input []byte, gas *uint64,
logger *logging.Logger) (output []byte, err error) {
// Deduct gas
gasRequired := uint64((len(input)+31)/32)*GasSha256Word + GasSha256Base
if *gas < gasRequired {
return nil, errors.ErrorCodeInsufficientGas
} else {
*gas -= gasRequired
}
// Hash
hasher := sha256.New()
// CONTRACT: this does not err
hasher.Write(input)
return hasher.Sum(nil), nil
}
func ripemd160Func(state Interface, caller crypto.Address, input []byte, gas *uint64,
logger *logging.Logger) (output []byte, err error) {
// Deduct gas
gasRequired := uint64((len(input)+31)/32)*GasRipemd160Word + GasRipemd160Base
if *gas < gasRequired {
return nil, errors.ErrorCodeInsufficientGas
} else {
*gas -= gasRequired
}
// Hash
hasher := ripemd160.New()
// CONTRACT: this does not err
hasher.Write(input)
return LeftPadBytes(hasher.Sum(nil), 32), nil
}
func identityFunc(state Interface, caller crypto.Address, input []byte, gas *uint64,
logger *logging.Logger) (output []byte, err error) {
// Deduct gas
gasRequired := uint64((len(input)+31)/32)*GasIdentityWord + GasIdentityBase
if *gas < gasRequired {
return nil, errors.ErrorCodeInsufficientGas
} else {
*gas -= gasRequired
}
// Return identity
return input, nil
}