我有一个xml文件，如下所示

<OfflinePaperlessKyc referenceId="686820201209011401091">
<UidData>
<Poi dob="21-01-1945" e="bd05902a34b7b9e4d92230ac6b0asded072c1c0945190ad357f9ceec387f6fd6" gender="M" m="ed4eeb1376575c1b59096cf5c41243re5f3d4146e0c63eb4cc08a6c22fa9afe5" name="Reepak Sangid"/>
<Poa careof="S/O John Uncle" country="India" dist="Jaipur" house="1134 - B" landmark="80 Feet Road 200 Feet Baypass ke pass" loc="Heerapura Ajmer Road" pc="302024" po="" state="Kerala" street="Heera Nagar" subdist="" vtc="Jaipur"/>
</UidData>
<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<CanonicalizationMethod Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
<SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/>
<Reference URI="">
<Transforms>
<Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
</Transforms>
<DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/>
<DigestValue>+ribhQOajFYDHgBTkjU0LSHWxRWpBkkrh4FbUj+RVss=</DigestValue>
</Reference>
</SignedInfo>
<SignatureValue>qGxO1EURe+FOr0mBocWvBDGuZm3ssVu6dYwSs5IvuA2OhlqH+Cp2WSQ3OKFvLZPfVSXBDNy/zC2F M5NI7RJjl2KaCMX+Qhko7UTpQp/8a/gX3jjcRP5Az8w4GQONIuZhLjUXxqgA4ln0y8vqfEhqdtVk 407QopDyNx6UH9VFCgmGjcDggLUgam1gG4P8Hka3WxT0BFTL7CWO4yVPRwEs8IvhcNvm8Db7p50a qWMwfOmNQQ/G7uj+tQ2wEKzWPcBoeQ6/qGCGfN+1Wt0gmEWIxYaKEDz9kQb8eiYOQSaht+2QzOX7 68gMrDXSms6ljrcklqmVrXwKvJXe5L0tfbNBuA==</SignatureValue>
</Signature>
</OfflinePaperlessKyc>

以下是有关签名的一些详细信息：
signature-signature：这将是下载的xml中数据的344个字符长的数字签名。这可以使用uidai的公钥进行验证，该公钥将出现在标准签名的xml中。
以下是下载xml的网站提供的步骤：验证签名的步骤：
读取整个xml。
从xml获取签名
从这里获取证书。
将证书转换为base64字符串。
这里提供了示例代码段。
以下是证书文件中的文本

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

如何使用证书文件验证xml文件中提供的数字签名。我搜索了许多问题，但它们对我不起作用。提前谢谢。
以下是我尝试的：

String certificate = "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";
            byte[] decoded = Base64.getDecoder().decode(certificate.getBytes());
            String signatureValue = "qGxO1EURe+FOr0mBocWvBDGuZm3ssVu6dYwSs5IvuA2OhlqH+Cp2WSQ3OKFvLZPfVSXBDNy/zC2F M5NI7RJjl2KaCMX+Qhko7UTpQp/8a/gX3jjcRP5Az8w4GQONIuZhLjUXxqgA4ln0y8vqfEhqdtVk 407QopDyNx6UH9VFCgmGjcDggLUgam1gG4P8Hka3WxT0BFTL7CWO4yVPRwEs8IvhcNvm8Db7p50a qWMwfOmNQQ/G7uj+tQ2wEKzWPcBoeQ6/qGCGfN+1Wt0gmEWIxYaKEDz9kQb8eiYOQSaht+2QzOX7 68gMrDXSms6ljrcklqmVrXwKvJXe5L0tfbNBuA==";
            byte[] aadharSignature = signatureValue.getBytes();

            //Creating KeyPair generator object
            KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
            keyPairGen.initialize(2048);
            KeyPair pair = keyPairGen.generateKeyPair();
            PrivateKey privKey = pair.getPrivate();
            Signature signature = Signature.getInstance("SHA1withRSA");
            signature.initSign(privKey);
            signature.update(aadharSignature);
            //Initializing the signature
            signature.initVerify(pair.getPublic());
            signature.update(decoded);

            //Verifying the signature
            boolean bool = signature.verify(decoded);

            if(bool) {
                System.out.println("Signature verified");
            } else {
                System.out.println("Signature failed");
            }

但这不起作用，并且在生成密钥时会产生错误。