fix: fix bug

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/decred/dcrd/dcrec/edwards/v2 v2.0.3
 	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.3.0
 	github.com/samber/lo v1.47.0
+	golang.org/x/crypto v0.28.0
 )
 
 require (

go.sum

@@ -10,5 +10,7 @@ github.com/decred/dcrd/dcrec/secp256k1/v4 v4.3.0 h1:rpfIENRNNilwHwZeG5+P150SMrnN
 github.com/decred/dcrd/dcrec/secp256k1/v4 v4.3.0/go.mod h1:v57UDF4pDQJcEfFUCRop3lJL149eHGSe9Jvczhzjo/0=
 github.com/samber/lo v1.47.0 h1:z7RynLwP5nbyRscyvcD043DWYoOcYRv3mV8lBeqOCLc=
 github.com/samber/lo v1.47.0/go.mod h1:RmDH9Ct32Qy3gduHQuKJ3gW1fMHAnE/fAzQuf6He5cU=
+golang.org/x/crypto v0.28.0 h1:GBDwsMXVQi34v5CCYUm2jkJvu4cbtru2U4TN2PSyQnw=
+golang.org/x/crypto v0.28.0/go.mod h1:rmgy+3RHxRZMyY0jjAJShp2zgEdOqj2AO7U0pYmeQ7U=
 golang.org/x/text v0.19.0 h1:kTxAhCbGbxhK0IwgSKiMO5awPoDQ0RpfiVYBfK860YM=
 golang.org/x/text v0.19.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=

xasn1/mod.go

@@ -4,7 +4,10 @@ import (
 	"crypto/x509/pkix"
 	"encoding/asn1"
 	"errors"
+	"golang.org/x/crypto/cryptobyte"
+	asn11 "golang.org/x/crypto/cryptobyte/asn1"
 	"math"
+	"math/big"
 )
 
 // ParseBase128Int parses a base-128 encoded int from the given offset in the
@@ -96,3 +99,26 @@ func ParsePKIXPublicKey(bs []byte) ([]byte, error) {
 	}
 	return pki.PublicKey.Bytes, nil
 }
+
+func ParseSignatureRS(bs []byte) (r *big.Int, s *big.Int, _ error) {
+	var inner cryptobyte.String
+	input := cryptobyte.String(bs)
+	if !input.ReadASN1(&inner, asn11.SEQUENCE) ||
+		!input.Empty() ||
+		!inner.ReadASN1Integer(&r) ||
+		!inner.ReadASN1Integer(&s) ||
+		!inner.Empty() {
+		return nil, nil, errors.New("invalid ASN.1")
+	}
+	return r, s, nil
+}
+
+func ParseSignatureRSSlice(bs []byte) (out [64]byte, _ error) {
+	r, s, err := ParseSignatureRS(bs)
+	if err != nil {
+		return [64]byte{}, err
+	}
+	r.FillBytes(out[0:32])
+	s.FillBytes(out[32:64])
+	return out, nil
+}

xcurve25519/signature.go

@@ -8,6 +8,10 @@ func UniformSignature(pubEndByte byte, signature [64]byte) Signature {
 	return signature
 }
 
-func ConvertEd25519PubKeyAndSig(pub xed25519.PublicKey, sig [64]byte) (pubCurve25519 PublicKey, _ Signature) {
-	return pub.ToEd25519(), UniformSignature(pub[len(pub)-1], sig)
+func ConvertEd25519PubKeyAndSig(pub xed25519.PublicKey, sig [64]byte) (pubCurve25519 PublicKey, _ Signature, _ error) {
+	out, err := pub.ToCurve25519()
+	if err != nil {
+		return [32]byte{}, [64]byte{}, err
+	}
+	return out, UniformSignature(pub[len(pub)-1], sig), nil
 }