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When signed data is packaged as PKCS#7, what all content PKCS#7 could be there(Ex. certificates, signature, etc.)? And what are the purpose of packaging all those contents?

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You can embed any data within a PKCS#7/CMS structure. The Cryptographic Message Syntax (which is the new name for PKCS#7) knows the types EnvelopedData for encrypted data and AuthenticatedData for signed/MACed data.

That way, you can create an enveloping signature, thus storing the signature and the signed data in a single file even when the format of your data does not support it.

  • When I sign a data and package it as PKCS#7 file, what all data should be there? and what is the reason behind it? – susthan Apr 7 '17 at 4:04
  • It it optional, if you actually do it, is up to the requirements of your application. As I wrote in my answer: You might want to do it, if you do not want to have a detached signature (a signature in a seperate file), but your file type does not allow to embed a signature directly. – mat Apr 7 '17 at 6:42

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