Merge our current version of the code with the OSS libsecutils.

[martin-barta-sie]

This is our attempt to once and for all unify our fork with the OSS code base. From this release onward, any potential future changes/updates will be directly contributed here.

Overview of Changes

API changes:

• functions for checking only against local CRLs added
• more generic functions for calculating/checking ICV added
• some functions moved to appropriate module (to util.h)

Internal changes:

• loading of credentials (.p12 containers):
  • containers with empty password are rejected if a nonempty password is provided as parameter (i.e. the empty password can no longer be used to circumvent UTA-protection)
  • containers that don't have private keys encrypted with the same algorithm that is used by "storage" functions (e.g. CREDENTIALS_save_dv) are rejected
• default log level changed to LOG_WARNING (should have minimal impact as most logs state the level explicitly)

Other changes:

• some includes fixed
• various compiler warnings fixed

[martin-barta-sie]

@DDvO @benjamin-schilling could you, please, review this and then merge it? If you have any comments, or you find any issues, let me know. Thanks

[DDvO]

The changelog sounds good, but it is quite a lot of stuff at once, mixed into a monolithic commit and PR. Would be much better to digest if it was structured into several PRs, each focusing on one topic.

[martin-barta-sie]

OK, I will try to split it into smaller ones

[martin-barta-sie]

@DDvO I've split it up into the following pull requests. Sorry it took so long, but I wanted to wait until we ironed out all the issues we found when integrating this in our projects. I will close this request as it's not needed anymore.

• 28

• 29

• 30

• 31

• 34

Less important:

• 32

• 33