System.Security 2.0.0.0 4.0.0.0 System.Security.Cryptography.Pkcs.Pkcs9AttributeObject A object will be automatically generated and placed in the property whenever the property for the corresponding signer is not empty. The class defines the message digest of a CMS/PKCS #7 message. Constructor 2.0.0.0 4.0.0.0 To be added. The constructor creates an instance of the class. Method 2.0.0.0 4.0.0.0 System.Void This method replaces the current object with the specified object. Copies information from an object. The object from which to copy information. Property 2.0.0.0 4.0.0.0 System.Byte[] To be added. To be added. The property retrieves the message digest.