Pkcs7 ctors

[WillChilds-Klein]

Status

This PR is currently posted as a draft just to run coverity. This is not yet ready for review.

ToDo

• move ASN1 definitions to their own file
• go through each function and assert it's as close to OSSL as possible
• doc comments
• what to do about d2i and i2d functions? currently too customized.

Notes

• in progress

Testing

• in progress

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 83.28076% with 53 lines in your changes missing coverage. Please review.

Project coverage is 78.51%. Comparing base (8d5e8c1) to head (6016c77).
Report is 2 commits behind head on main.

Files	Patch %	Lines
crypto/pkcs7/pkcs7.c	81.30%	43 Missing ⚠️
crypto/pkcs7/pkcs7_x509.c	87.50%	8 Missing ⚠️
crypto/pkcs7/pkcs7_asn1.c	90.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1710      +/-   ##
==========================================
+ Coverage   78.43%   78.51%   +0.07%     
==========================================
  Files         580      581       +1     
  Lines       96756    97052     +296     
  Branches    13864    13912      +48     
==========================================
+ Hits        75892    76196     +304     
+ Misses      20247    20239       -8     
  Partials      617      617              

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