如何解决签名和验证之间封装xml签名时原始数据的差异？

问：

            DigestMethod sm3DigMethod = fac.newDigestMethod(DOMDigestMethod.SM3, null);


            
            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
            docBuilderFactory.setNamespaceAware(true);
            Document signatureDoc = docBuilderFactory.newDocumentBuilder().parse(new ByteArrayInputStream(data));
            XMLStructure content = new DOMStructure(signatureDoc.getDocumentElement());
            XMLObject obj = fac.newXMLObject(Collections.singletonList(content), "object", (String) null, (String) null);

            
            CanonicalizationMethod c14nWithCommentMethod =
                    fac.newCanonicalizationMethod("http://127.0.0.1/TR/2001/REC-xml-c14n-20010315#WithComments", (C14NMethodParameterSpec) null);
            
            SignatureMethod sm2_sm3SigMethod = fac.newSignatureMethod(DOMSignatureMethod.SM2_SM3, null);
            
            SignedInfo signedInfo = fac.newSignedInfo(c14nWithCommentMethod, sm2_sm3SigMethod, Collections.singletonList(refToRootDoc));

            KeyInfoFactory keyInfoFac = fac.getKeyInfoFactory();
            KeyValue keyValue = keyInfoFac.newKeyValue(publicKey);
            KeyInfo keyInfo = keyInfoFac.newKeyInfo(Collections.singletonList(keyValue));
            
            XMLSignature signature = fac.newXMLSignature(signedInfo, keyInfo, Collections.singletonList(obj), null, null);


            DOMSignContext dsc = new DOMSignContext(privateKey, signatureDoc);

            
            signature.sign(dsc);

签名时：原始数据在此处输入图像描述

验证时：原始数据在此处输入图像描述

我觉得签名部分的代码有问题，希望能用实际的原文签名。我需要做什么