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PKCS#7: SignedData and SignerInfo
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.. module:: signify.pkcs7

To support Authenticode, this library includes some code to parse and validate
SignedData structures. These are defined in several RFCs, which used to be called PKCS#7
The structure of all relevant RFC's follow ASN.1 notation to define the relevant
structures. These definitions are not always easily digested, but it does show which
fields are available.

This chapter of the documentation shows how these basic structures work, so we can dive
deep into their operations in the next chapter.

The following diagram shows the relation between SignedData and SignerInfo:

.. image:: https://yuml.me/8e9c7bb6.svg

Note that although this diagram is not very complicated, when discussing Authenticode,
we will be creating multiple SignedData and SignerInfo structures, nested in each other,
so it's important to fully understand this structure.

SignedData
==========
The SignedData object is the root structure for sending encrypted data in PKCS#7.

.. autoclass:: SignedData
   :members:

SignerInfo
==========

.. autoclass:: SignerInfo
   :members:

CounterSignerInfo
=================

.. autoclass:: CounterSignerInfo
   :members: