fix compilation issues

waku/common/message_hash.go

@@ -3,6 +3,9 @@ package common
 import (
 	"crypto/sha256"
 	"encoding/binary"
+	"encoding/hex"
+	"errors"
+	"fmt"
 	"hash"
 	"sync"
 
@@ -27,6 +30,27 @@ func ToMessageHash(b []byte) MessageHash {
 	return result
 }
 
+func ToMessageHashFromStringFormat(val string) (MessageHash, error) {
+	if len(val) == 0 {
+		return MessageHash{}, errors.New("empty message hash string not allowed")
+	}
+
+	if len(val) < 2 || val[:2] != "0x" {
+		return MessageHash{}, errors.New("string must start with 0x")
+	}
+
+	// Remove "0x" prefix for hex decoding
+	hexStr := val[2:]
+
+	// Verify the remaining string is valid hex
+	v, err := hex.DecodeString(hexStr)
+	if err != nil {
+		return MessageHash{}, fmt.Errorf("invalid hex string: %v", err)
+
+	}
+	return MessageHash(v), nil
+}
+
 var sha256Pool = sync.Pool{New: func() interface{} {
 	return sha256.New()
 }}

waku/nwaku.go

@@ -1015,7 +1015,7 @@ func (n *WakuNode) RelayPublish(ctx context.Context, message *common.WakuMessage
 	wg.Wait()
 	if C.getRet(resp) == C.RET_OK {
 		msgHash := C.GoStringN(C.getMyCharPtr(resp), C.int(C.getMyCharLen(resp)))
-		parsedMsgHash, err := common.ToMessageHash(msgHash)
+		parsedMsgHash, err := common.ToMessageHashFromStringFormat(msgHash)
 		if err != nil {
 			return common.MessageHash([32]byte{}), err
 		}