schnorr: bip-340 compliant verification

fixes btcsuite#2017
wydengyre · Aug 12, 2023 · ab9338d · ab9338d
1 parent 0aaa7c5
commit ab9338d
Showing 1 changed file with 1 addition and 4 deletions.
diff --git a/btcec/schnorr/signature.go b/btcec/schnorr/signature.go
@@ -91,10 +91,7 @@ func ParseSignature(sig []byte) (*Signature, error) {
 		return nil, signatureError(ecdsa_schnorr.ErrSigRTooBig, str)
 	}
 	var s btcec.ModNScalar
-	if overflow := s.SetByteSlice(sig[32:64]); overflow {
-		str := "invalid signature: s >= group order"
-		return nil, signatureError(ecdsa_schnorr.ErrSigSTooBig, str)
-	}
+	s.SetByteSlice(sig[32:64])
 
 	// Return the signature.
 	return NewSignature(&r, &s), nil