How to Create a Digitally Signed SAML Assertion in a SOAP Message using C#?

Generating a Digitally Signed SAML Assertion Embedded in a C# SOAP Message

This C# code demonstrates the creation of a SOAP message containing a digitally signed SAML assertion. The process involves XML document manipulation, SOAP element construction, digital signature generation using an X509 certificate, and subject data population. The resulting digitally signed SOAP message is suitable for SAML-based authentication and authorization.

1. SOAP Message Construction:

• An XmlDocument object is used to build the SOAP message structure.
• A string template defines the SOAP envelope, including header and body sections. The timestamp within the SOAP message uses the DateTime.Now.ToUniversalTime().ToString("yyyy-MM-ddThh:mm:ss.fffZ") format for accurate representation.

2. Digital Signature Implementation:

• A SignedXml object is initialized with the SAML assertion XmlElement and the private key derived from the supplied X509 certificate.
• A reference is created and added to SignedXml, incorporating necessary transformations.
• Key information, including the certificate's public key, is encapsulated within a KeyInfo object.
• The ComputeSignature method generates the digital signature, which is then integrated as an XmlElement into the SAML assertion.

3. Subject Data Integration:

• A subject element is appended to the SAML assertion.
• Subject details, such as a name identifier and confirmation data, are included.

4. Output and Persistence:

• The completed SOAP message is ready for saving to a file for subsequent use or transmission.

This code exemplifies the creation of a SOAP message with a digitally signed SAML assertion, utilizing C#'s XML manipulation and digital signature capabilities.

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