forked from Wollac/iota-crypto-demo
-
Notifications
You must be signed in to change notification settings - Fork 0
/
address.go
208 lines (179 loc) · 4.92 KB
/
address.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
// Package address provides utility functionality to encode and decode bech32 based addresses.
package address
import (
"encoding/hex"
"errors"
"fmt"
"golang.org/x/crypto/blake2b"
"github.com/iotaledger/iota-crypto-demo/pkg/bech32"
"github.com/iotaledger/iota-crypto-demo/pkg/ed25519"
)
const (
// OutputIDLength defines the length of an OutputID.
OutputIDLength = blake2b.Size256 + 2
// Blake2b160Length defines the size of a BLAKE2b-160 hash in bytes.
Blake2b160Length = 20
)
// Errors returned during address parsing.
var (
ErrInvalidPrefix = errors.New("invalid prefix")
ErrInvalidVersion = errors.New("invalid version")
ErrInvalidLength = errors.New("invalid length")
)
// Prefix denotes the different network prefixes.
type Prefix int
// Network prefix options.
const (
IOTAMainnet Prefix = iota
IOTADevnet
ShimmerMainnet
ShimmerDevnet
)
var hrpStrings = [...]string{"iota", "atoi", "smr", "rms"}
func (p Prefix) String() string {
return hrpStrings[p]
}
func ParsePrefix(s string) (Prefix, error) {
for i := range hrpStrings {
if s == hrpStrings[i] {
return Prefix(i), nil
}
}
return 0, ErrInvalidPrefix
}
// Version denotes the version of an address.
type Version byte
// Supported address versions.
const (
Ed25519 Version = 0x00
Alias Version = 0x08
NFT Version = 0x10
)
var versionStrings = map[Version]string{0x00: "Ed25519", 0x08: "Alias", 0x10: "NFT"}
func (v Version) String() string {
return versionStrings[v]
}
func ParseVersion(s string) (Version, error) {
for v, versionString := range versionStrings {
if s == versionString {
return v, nil
}
}
return 0, ErrInvalidVersion
}
// Bech32 encodes the provided addr as a bech32 string.
func Bech32(hrp Prefix, addr Address) (string, error) {
return bech32.Encode(hrp.String(), addr.Bytes())
}
// ParseBech32 decodes a bech32 encoded string.
func ParseBech32(s string) (Prefix, Address, error) {
hrp, addrData, err := bech32.Decode(s)
if err != nil {
return 0, nil, fmt.Errorf("invalid bech32 encoding: %w", err)
}
prefix, err := ParsePrefix(hrp)
if err != nil {
return 0, nil, fmt.Errorf("invalid human-readable prefix: %w", err)
}
if len(addrData) == 0 {
return 0, nil, fmt.Errorf("%w: no version", ErrInvalidVersion)
}
version := Version(addrData[0])
addrData = addrData[1:]
switch version {
case Ed25519:
if len(addrData) != blake2b.Size256 {
return 0, nil, fmt.Errorf("invalid Ed25519 address: %w", ErrInvalidLength)
}
var addr Ed25519Address
copy(addr.hash[:], addrData)
return prefix, addr, nil
case Alias:
if len(addrData) != Blake2b160Length {
return 0, nil, fmt.Errorf("invalid Alias address: %w", ErrInvalidLength)
}
var addr AliasAddress
copy(addr.hash[:], addrData)
return prefix, addr, nil
case NFT:
if len(addrData) != Blake2b160Length {
return 0, nil, fmt.Errorf("invalid NFT address: %w", ErrInvalidLength)
}
var addr NFTAddress
copy(addr.hash[:], addrData)
return prefix, addr, nil
}
return 0, nil, fmt.Errorf("%w: %d", ErrInvalidVersion, version)
}
func blake2bSum160(b []byte) [Blake2b160Length]byte {
h, err := blake2b.New(Blake2b160Length, nil)
if err != nil {
panic(err)
}
_, err = h.Write(b)
if err != nil {
panic(err)
}
var sum160 [Blake2b160Length]byte
copy(sum160[:], h.Sum(nil))
return sum160
}
// Address specifies a general address of different underlying types.
type Address interface {
Version() Version
Bytes() []byte
String() string
}
type Ed25519Address struct {
hash [blake2b.Size256]byte
}
func (Ed25519Address) Version() Version {
return Ed25519
}
func (a Ed25519Address) Bytes() []byte {
return append([]byte{byte(Ed25519)}, a.hash[:]...)
}
func (a Ed25519Address) String() string {
return hex.EncodeToString(a.hash[:])
}
// AddressFromPublicKey creates an address from a 32-byte hash.
//
//nolint:revive
func AddressFromPublicKey(key ed25519.PublicKey) Ed25519Address {
if len(key) != ed25519.PublicKeySize {
panic("invalid public key size")
}
return Ed25519Address{blake2b.Sum256(key)}
}
type AliasAddress struct {
hash [Blake2b160Length]byte
}
func (AliasAddress) Version() Version {
return Alias
}
func (a AliasAddress) Bytes() []byte {
return append([]byte{byte(Alias)}, a.hash[:]...)
}
func (a AliasAddress) String() string {
return hex.EncodeToString(a.hash[:])
}
// AliasAddressFromOutputID returns the alias address computed from a given OutputID.
func AliasAddressFromOutputID(outputID [OutputIDLength]byte) AliasAddress {
return AliasAddress{blake2bSum160(outputID[:])}
}
type NFTAddress struct {
hash [Blake2b160Length]byte
}
func (NFTAddress) Version() Version {
return NFT
}
func (a NFTAddress) Bytes() []byte {
return append([]byte{byte(NFT)}, a.hash[:]...)
}
func (a NFTAddress) String() string {
return hex.EncodeToString(a.hash[:])
}
// NFTAddressFromOutputID returns the alias address computed from a given OutputID.
func NFTAddressFromOutputID(outputID [OutputIDLength]byte) NFTAddress {
return NFTAddress{blake2bSum160(outputID[:])}
}