The structure of the application / pkcs7-mime object (.p7m, .p7c) is of interest. The question is how to create an application / pkcs7-mime object without using System.Security.Cryptography.Pkcs?
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1 answer
There is a specification , in theory everything is described there, but I don’t know if you are ready for such a feat - I would not undertake to study this document.
You can also take Reflector and decompile the classes in System.Security.Cryptography.Pkcs
Or, another option: search for third-party libraries
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