访问webservice时的数字签名验证错误

Question

根据文档创建的步骤如下：

1. 创建XML数据的DOM表示形式
2. 创建DOM数据的规范化表示。规范的陈述应遵循http://www.w3.org/tr/2001/rec-xml-c14n-20010315#with comments；
中描述的格式
3. 创建规范化表示的SHA1摘要的签名RSA加密。签名使用参与者的私钥加密；
4. 将二进制签名编码为base64编码的字符串
5. 将签名字符串放置在SOAP消息reqdigsig元素中；
6. 存储XML数据，以支持提交的XML数据的不可否认性。

我使用了以下代码：

private string SignXML(X509Certificate2 Cert, string data)
    {
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.PreserveWhitespace = false;
        xmlDoc.LoadXml(data);

        XmlDsigC14NWithCommentsTransform t = new XmlDsigC14NWithCommentsTransform();
        t.LoadInput(xmlDoc);
        Stream s = (Stream)t.GetOutput(typeof(Stream));

        SHA1 sha1 = SHA1.Create();
        byte[] hash = sha1.ComputeHash(s);


        RSACryptoServiceProvider rsaKey =
        (RSACryptoServiceProvider)Cert.PrivateKey;
        RSAParameters rsaPrivateParams = rsaKey.ExportParameters(true);
        rsaKey.ImportParameters(rsaPrivateParams);
        byte[] signature =  rsaKey.Encrypt(hash, false);

        return Convert.ToBase64String(signature);
    }

上面的代码是否符合文档中的描述？如何验证数码签署是否有效？有什么在线工具吗？

“帖子编辑如下”我尝试过使用以下。我已经验证了签名，它返回true。但从webservice端失败。signData、signHash和rsaPKCsignatureformatter类的createsignature方法之间有什么区别？

        var document = Encoding.UTF8.GetBytes(Reqdata);

        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.PreserveWhitespace = false;
        xmlDoc.LoadXml(Reqdata);

        //trial with XmlDsigC14NWithCommentsTransform class
        XmlDsigC14NWithCommentsTransform t = new XmlDsigC14NWithCommentsTransform();
        t.LoadInput(xmlDoc);
        Stream s = (Stream)t.GetOutput(typeof(Stream));

        //trial with SignedXML class
        SignedXml signedXml = new SignedXml(xmlDoc);
        signedXml.SignedInfo.CanonicalizationMethod =
        SignedXml.XmlDsigC14NWithCommentsTransformUrl;
        document = Encoding.UTF8.GetBytes(signedXml.ToString());

        byte[] hashedDocument;

        using (var sha1 = SHA1.Create())
        {
            //hashedDocument = sha1.ComputeHash(document);
            hashedDocument = sha1.ComputeHash(s);
        }

        var digitalSignature = new DigitalSignature();
        digitalSignature.AssignNewKey();

        byte[] signature = digitalSignature.SignData(hashedDocument);
        string finalsignature = Convert.ToBase64String(signature) ;
        byte[] finalSignveri = Convert.FromBase64String(finalsignature);
        bool verified = digitalSignature.VerifySignature(hashedDocument, finalSignveri);

数字签名类如下所示：

public class DigitalSignature
{
    private RSAParameters publicKey;
    private RSAParameters privateKey;

    public void AssignNewKey()
    {
        using (var rsa = new RSACryptoServiceProvider())
        {
            rsa.PersistKeyInCsp = false;
            publicKey = rsa.ExportParameters(false);
            privateKey = rsa.ExportParameters(true);
        }
    }

    public byte[] SignData(byte[] hashOfDataToSign)
    {
        using (var rsa = new RSACryptoServiceProvider())
        {
            rsa.PersistKeyInCsp = false;
            rsa.ImportParameters(privateKey);

            var rsaFormatter = new RSAPKCS1SignatureFormatter(rsa);
            rsaFormatter.SetHashAlgorithm("SHA1");

            return rsaFormatter.CreateSignature(hashOfDataToSign);
        }
    }

    public bool VerifySignature(byte[] hashOfDataToSign, byte[] signature)
    {
        using (var rsa = new RSACryptoServiceProvider())
        {
            rsa.ImportParameters(publicKey);

            var rsaDeformatter = new RSAPKCS1SignatureDeformatter(rsa);
            rsaDeformatter.SetHashAlgorithm("SHA1");

            return rsaDeformatter.VerifySignature(hashOfDataToSign, signature);
        }
    }   
}

[Redited]

请在下面找到在Java中生成数字签名的代码片段。这是第三方发过来参考的。我不是java开发人员。有人能告诉我我写的C#代码是否与Java代码对应吗？如果没有，请让我知道我错在哪里。

private static String createDigitalSignature(Key key, byte[] data) {

    byte[] signature = null;

    try {
        // Initialize xml-security library
        org.apache.xml.security.Init.init();

        // Build DOM document from XML data
        DocumentBuilderFactory dfactory = DocumentBuilderFactory
                .newInstance();
        dfactory.setNamespaceAware(true);
        dfactory.setValidating(true);
        DocumentBuilder documentBuilder = dfactory.newDocumentBuilder();
        // This is to throw away all validation errors
        documentBuilder
                .setErrorHandler(new org.apache.xml.security.utils.IgnoreAllErrorHandler());
        Document doc = documentBuilder
                .parse(new ByteArrayInputStream(data));

        // Build canonicalized XML from document
        Canonicalizer c14n = Canonicalizer
                .getInstance("http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments");
        byte[] canonBytes = c14n.canonicalizeSubtree(doc);

        // Initialize signing object with SHA1 digest and RSA encryption
        Signature rsa = Signature.getInstance("SHA1withRSA");

        // Set private key into signing object
        rsa.initSign((PrivateKey) key);

        // Generate signature
        rsa.update(canonBytes);
        signature = rsa.sign();
    } catch (Exception ex) {
        System.out.println("Exception occurred in createDigitalSignature: "
                + ex.toString());
        System.exit(-1);
    }

    // Base64 encode signature
    BASE64Encoder b64e = new BASE64Encoder();
    String signatureString = b64e.encode(signature);

    return signatureString;
}

Answer 1

在步骤3，数字签名与加密摘要不完全相同。具有PKCS#1格式的rsa数字签名将digestAlgorithm OID（标识符）与digest值连接起来。因此您正在生成无效的签名。

所有编程语言都有一种不需要处理摘要和密码就能执行数字签名的方法。我不是C#程序员，但我猜您必须使用rsacryptoServiceProvider.signData

还可以使用VerifyData验证签名