Support verifying messages with multiple signers

[komelchenko-vcc]

Description

Support verifying messages with multiple signers. (ZD 20046)

Testing

Verifying by make unit_test. The output can be found in wolfssl-unit_test-out.txt, if required.

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[wolfSSL-Bot]

Can one of the admins verify this patch?

[dgarske]

Hi @komelchenko-vcc ,

Thank you for this excellent contribution. I don't see you setup as a contributor yet. Please send an email to support at wolfssl dot com and reference this PR to get that process started.

Thanks,
David Garske, wolfSSL

[JacobBarthelmeh]

Ok to test

Preimptevily letting Jenkins run tests on the changes. Thanks for the opening the pull request and submiting the code! If you have not yet, please contact [email protected] to start that process.

[dgarske]

Retest this please: "history lost"

[dgarske]

Still waiting on contributor agreement. @JacobBarthelmeh please review when you have time as you are very familiar with the PKCS7 code.

[dgarske]

Retest this please

[dgarske]

Jenkins retest this please. Correct issue with FIPSv5 typo.