How to know the filename and extension of a file in PKCS7 envelope

Hi! I've a programm that makes a PKCS7 file. I'm enveloping just one file at a time. I want to know if there is a way to know the filename and extension of the file INSIDE de PKCS7 envelope. Because I receive a file that has .p7 extension, but the real document, the one to be decyprted, I don't know its name nor its extension, and I need both for writing it (I will not just invent some name).
Best regards!

The construct of the PKCS7 structure you have, is defined in rfc2633. The part defining EncapsulatedContent is introduced in CMS [rfc2639], where no such attribute for a file name is saved in the structure.
In some occasions, when it is critical, organizations add own object identifier and attibutes to save such descrptivie information as filename and extension.
A practical approach is, on the signing side, sign the file A.ext to A-ext.p7m resp. A-ext.p7s
You can not assume a global approach to get back the original filename (if you have no agreement on not the signing peer as above) of the encapsulated data. The reason is, the encapsulated data field is general and it does not neccesarily mean it was a file (a part of a stream or any definite sequence of bytes in general).

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How to know the filename and extension of a file in PKCS7 envelope

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