A Signing Key Is Required To Generate An Xml Signature

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(C#) Create XML Signature with Certificate's Private Key. Demonstrates how to create an XML digital signature using a certificate's RSA private key. This example loads the certificate from a PFX, and uses the cert's associated private key to sign. The public key is embedded in the XML signature as a ds:KeyInfo / ds:KeyValue / dsRSAKeyValue element. Dec 11, 2019 SignXML: XML Signature in Python. SignXML is an implementation of the W3C XML Signature standard in Python. This standard (also known as XMLDSig and RFC 3275) is used to provide payload security in SAML 2.0 and WS-Security, among other uses.

Aug 08, 2001 XML Signature is an evolving standard for digital signatures that both addresses the special issues and requirements that XML presents for signing operations and uses XML syntax for capturing the result, simplifying its integration into XML applications. If it's specific to a particular certificate/private key then there must be an issue with that certificate/private key. The most likely cause is that the wrong cryptographic provider is associated with the private key. The ADSS Verification Server not only ensures that the document has not been changed since signing and that the signer’s credentials are valid (not expired, not revoked and issued by a trusted CA) but can also report on the quality level of the signature and the associated certificate quality level – see this information on PEPPOL.

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How to: Sign XML Documents with Digital Signatures

dotnet-standard

System.Security.Cryptography.SignedXml class

System.Security.Cryptography.RSACryptoServiceProvider class

XML signing

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You can use the classes in the xref:System.Security.Cryptography.Xml namespace to sign an XML document or part of an XML document with a digital signature. XML digital signatures (XMLDSIG) allow you to verify that data was not altered after it was signed. For more information about the XMLDSIG standard, see the World Wide Web Consortium (W3C) recommendation XML Signature Syntax and Processing.

The code example in this procedure demonstrates how to digitally sign an entire XML document and attach the signature to the document in a <Signature> element. The example creates an RSA signing key, adds the key to a secure key container, and then uses the key to digitally sign an XML document. The key can then be retrieved to verify the XML digital signature, or can be used to sign another XML document.

For information about how to verify an XML digital signature that was created using this procedure, see How to: Verify the Digital Signatures of XML Documents.

To digitally sign an XML document

Create a xref:System.Security.Cryptography.CspParameters object and specify the name of the key container.
[!code-csharpHowToSignXMLDocumentRSA#2][!code-vbHowToSignXMLDocumentRSA#2]
Generate an asymmetric key using the xref:System.Security.Cryptography.RSACryptoServiceProvider class. The key is automatically saved to the key container when you pass the xref:System.Security.Cryptography.CspParameters object to the constructor of the xref:System.Security.Cryptography.RSACryptoServiceProvider class. This key will be used to sign the XML document.
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Create an xref:System.Xml.XmlDocument object by loading an XML file from disk. The xref:System.Xml.XmlDocument object contains the XML element to encrypt.
[!code-csharpHowToSignXMLDocumentRSA#4][!code-vbHowToSignXMLDocumentRSA#4]
Create a new xref:System.Security.Cryptography.Xml.SignedXml object and pass the xref:System.Xml.XmlDocument object to it.
[!code-csharpHowToSignXMLDocumentRSA#5][!code-vbHowToSignXMLDocumentRSA#5]
Add the signing RSA key to the xref:System.Security.Cryptography.Xml.SignedXml object.
[!code-csharpHowToSignXMLDocumentRSA#6][!code-vbHowToSignXMLDocumentRSA#6]
Create a xref:System.Security.Cryptography.Xml.Reference object that describes what to sign. To sign the entire document, set the xref:System.Security.Cryptography.Xml.Reference.Uri%2A property to '.
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Add an xref:System.Security.Cryptography.Xml.XmlDsigEnvelopedSignatureTransform object to the xref:System.Security.Cryptography.Xml.Reference object. A transformation allows the verifier to represent the XML data in the identical manner that the signer used. XML data can be represented in different ways, so this step is vital to verification.
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Add the xref:System.Security.Cryptography.Xml.Reference object to the xref:System.Security.Cryptography.Xml.SignedXml object.
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Compute the signature by calling the xref:System.Security.Cryptography.Xml.SignedXml.ComputeSignature%2A method.
Rocket elague key generator steam. [!code-csharpHowToSignXMLDocumentRSA#10][!code-vbHowToSignXMLDocumentRSA#10]
Retrieve the XML representation of the signature (a <Signature> element) and save it to a new xref:System.Xml.XmlElement object.
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Append the element to the xref:System.Xml.XmlDocument object.
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Save the document.
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Example

This example assumes that a file named test.xml exists in the same directory as the compiled program. You can place the following XML into a file called test.xml and use it with this example.

[!code-csharpHowToSignXMLDocumentRSA#1][!code-vbHowToSignXMLDocumentRSA#1]

Compiling the Code