Pkcs7

[siccegge]

Hi there!

I'm currently in need for PKCS#7 support and therefore looking into it. Obviously the current state (as in this PR) is crap and should not be used as-is. However I do have some questions

The most pressing Problem seems to be the Encoding. PKCS#7 on purpose employes undefined length BER encoding which is near-impossible to fit onto the current asn.1 implementation (You only learn the length of an object once you have parsed all its (recursive) children.

On a lesser thing: having this be Crypto.IO.PKCS7 sounds fine? How do you actually test Python2.4 support? Do you all have some VM around that has this somewhat dated version opf python installed?

[siccegge]

Hi again!

This is now mostly enough of a hack to do what I immediately need. What remains is making the code actually "publishable" and nice for inclusion

I haven't really figured out how to deal with the BER stuff. I'm thinking of making the Der/Ber/.. thing a mixin to the existing datatypes maybe.

What are your opinions on using an already existing external asn.1 library?

[Legorooj]

PKCS#7 is now supported:

from Crypto.Util.Padding import pad
padded-data = pad(data, block_size, 'pkcs7'). #pkcs7 is the default mode

This pull request should be closed.

@siccegge did you receive this?