ere wrote:
Hi,
Ok, I will explain it better.
I want to create a PKCS7 in 3 steps, Why?, Because i have web clients in
Internet and i prefer send them 20 bytes before that a document with 2MB...

There are some security problems with that approach. In effect, you're asking the client to sign a hash on something the client has not seen. So, you could substitute the hash for a document in which the client promises to give you all his money and assets, and the client would sign it. Not a good idea.

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