neoneo-go/pkg/crypto/keys/wif.go
Roman Khimov eb67145f81 keys: check length first, then do things in WIFDecode
Otherwise we can easily panic there on bad input.
2022-09-02 14:44:32 +03:00

89 lines
1.9 KiB
Go

package keys
import (
"bytes"
"fmt"
"github.com/nspcc-dev/neo-go/pkg/encoding/base58"
"github.com/nspcc-dev/neo-go/pkg/util/slice"
)
const (
// WIFVersion is the version used to decode and encode WIF keys.
WIFVersion = 0x80
)
// WIF represents a wallet import format.
type WIF struct {
// Version of the wallet import format. Default to 0x80.
Version byte
// Bool to determine if the WIF is compressed or not.
Compressed bool
// A reference to the PrivateKey which this WIF is created from.
PrivateKey *PrivateKey
// A string representation of the WIF.
S string
}
// WIFEncode encodes the given private key into a WIF string.
func WIFEncode(key []byte, version byte, compressed bool) (s string, err error) {
if version == 0x00 {
version = WIFVersion
}
if len(key) != 32 {
return s, fmt.Errorf("invalid private key length: %d", len(key))
}
buf := new(bytes.Buffer)
buf.WriteByte(version)
buf.Write(key)
if compressed {
buf.WriteByte(0x01)
}
s = base58.CheckEncode(buf.Bytes())
return
}
// WIFDecode decodes the given WIF string into a WIF struct.
func WIFDecode(wif string, version byte) (*WIF, error) {
b, err := base58.CheckDecode(wif)
if err != nil {
return nil, err
}
defer slice.Clean(b)
if version == 0x00 {
version = WIFVersion
}
w := &WIF{
Version: version,
S: wif,
}
switch len(b) {
case 33: // OK, uncompressed public key.
case 34: // OK, compressed public key.
// Check the compression flag.
if b[33] != 0x01 {
return nil, fmt.Errorf("invalid compression flag %d expecting %d", b[33], 0x01)
}
w.Compressed = true
default:
return nil, fmt.Errorf("invalid WIF length %d, expecting 33 or 34", len(b))
}
if b[0] != version {
return nil, fmt.Errorf("invalid WIF version got %d, expected %d", b[0], version)
}
// Derive the PrivateKey.
w.PrivateKey, err = NewPrivateKeyFromBytes(b[1:33])
if err != nil {
return nil, err
}
return w, nil
}