XML DSIG：.NET 中的封装签名转换

Question

我正在使用 XmlDsigEnvelopedSignatureTransform 使用 RSA 私钥对 XML 文件进行数字签名。

然而，我真正想要的是使用“封装”签名来签署 xml。 .NET 对此有本机支持吗？

顺便说一下，这是我的代码：

public static void SignXml(XmlDocument xmlDoc, RSA key)
{
    // Check arguments.
    if (xmlDoc == null)
        throw new ArgumentException("xmlDoc");
    if (key == null)
        throw new ArgumentException("Key");

    SignedXml xml = new SignedXml(xmlDoc);            
    xml.SigningKey = key;

    Reference reference = new Reference();
    reference.Uri = "";

    XmlDsigEnvelopedSignatureTransform env = new XmlDsigEnvelopedSignatureTransform(true);                        

    reference.AddTransform(env);

    xml.AddReference(reference);

    xml.ComputeSignature();

    XmlElement element = xml.GetXml();

    MessageBox.Show(element.OuterXml);

    xmlDoc.DocumentElement.AppendChild(xmlDoc.ImportNode(element, true));

}

Answer 1

如果您的签名不是签名数据的子元素，则不需要封装签名转换。

因此，只需跳过 XmlDsigEnvelopedSignatureTransform 并按照其他方式执行签名即可：

public XmlElement SignXml(XmlDocument xmlDoc, RSA key)
{
  SignedXml xml = new SignedXml();            
  xml.SigningKey = key;

  // Add the data to be signed as a sub-element of the Signature-element:
  DataObject dataObject = new DataObject();
  dataObject.Data = xmlDoc.ChildNodes;
  dataObject.Id = "doc";
  xml.AddObject(dataObject);

  // Add a reference to the signed data:
  Reference reference = new Reference();
  reference.Uri = "#doc";
  xml.AddReference(reference);  

  // Perform the signature. No transforms are needed.
  xml.ComputeSignature();

  return xml.GetXml();
}