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signature.go
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signature.go
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package ecc
import (
"bytes"
"encoding/json"
"fmt"
"strings"
"github.com/eoscanada/eos-go/btcsuite/btcutil/base58"
)
type innerSignature interface {
verify(content []byte, hash []byte, pubKey PublicKey) bool
publicKey(content []byte, hash []byte) (out PublicKey, err error)
string(content []byte) string
}
// Signature represents a signature for some hash
type Signature struct {
Curve CurveID
Content []byte // the Compact signature as bytes
innerSignature innerSignature
}
func (s Signature) Verify(hash []byte, pubKey PublicKey) bool {
return s.innerSignature.verify(s.Content, hash, pubKey)
}
func (s Signature) PublicKey(hash []byte) (out PublicKey, err error) {
return s.innerSignature.publicKey(s.Content, hash)
}
func (s Signature) String() string {
return s.innerSignature.string(s.Content)
}
func NewSignatureFromData(data []byte) (Signature, error) {
if len(data) != 66 {
return Signature{}, fmt.Errorf("data length of a signature should be 66, reveived %d", len(data))
}
signature := Signature{
Curve: CurveID(data[0]), // 1 byte
Content: data[1:], // 65 bytes
}
switch signature.Curve {
case CurveK1:
signature.innerSignature = &innerK1Signature{}
case CurveR1:
signature.innerSignature = &innerR1Signature{}
default:
return Signature{}, fmt.Errorf("invalid curve %q", signature.Curve)
}
return signature, nil
}
func MustNewSignatureFromData(data []byte) Signature {
sig, err := NewSignatureFromData(data)
if err != nil {
panic(err.Error())
}
return sig
}
func NewSignature(fromText string) (Signature, error) {
if !strings.HasPrefix(fromText, "SIG_") {
return Signature{}, fmt.Errorf("signature should start with SIG_")
}
if len(fromText) < 8 {
return Signature{}, fmt.Errorf("invalid signature length")
}
fromText = fromText[4:] // remove the `SIG_` prefix
var curvePrefix = fromText[:3]
switch curvePrefix {
case "K1_":
fromText = fromText[3:] // strip curve ID
sigbytes := base58.Decode(fromText)
content := sigbytes[:len(sigbytes)-4]
checksum := sigbytes[len(sigbytes)-4:]
verifyChecksum := Ripemd160checksumHashCurve(content, CurveK1)
if !bytes.Equal(verifyChecksum, checksum) {
return Signature{}, fmt.Errorf("signature checksum failed, found %x expected %x", verifyChecksum, checksum)
}
return Signature{Curve: CurveK1, Content: content, innerSignature: &innerK1Signature{}}, nil
case "R1_":
fromText = fromText[3:] // strip R1_
content := base58.Decode(fromText)
//todo: stuff here
return Signature{Curve: CurveR1, Content: content, innerSignature: &innerR1Signature{}}, nil
default:
return Signature{}, fmt.Errorf("invalid curve prefix %q", curvePrefix)
}
}
func (s Signature) MarshalJSON() ([]byte, error) {
return json.Marshal(s.String())
}
func (s *Signature) UnmarshalJSON(data []byte) (err error) {
var sig string
err = json.Unmarshal(data, &sig)
if err != nil {
return
}
*s, err = NewSignature(sig)
return
}