fips: mark RSA SigVer operation approved for known modulus sizes

Split off from !1624 with only FIPS related changes.

Checklist

• Commits have Signed-off-by: with name/author being identical to the commit author
• Code modified for feature
• Test suite updated with functionality tests
• Test suite updated with negative tests
• Documentation updated / NEWS entry present (for non-trivial changes)
• CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

Reviewer's checklist:

• Any issues marked for closing are addressed
• There is a test suite reasonably covering new functionality or modifications
• Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTION.md
• This feature/change has adequate documentation added
• No obvious mistakes in the code

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• 626f3d3b - nettle: mark RSA SigVer operation approved for known modulus sizes

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mentioned in merge request !1624

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• 88e282f0 - nettle: mark RSA SigVer operation approved for known modulus sizes

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assigned to @dueno

requested review from @asosedkin

I don't see a problem with these changes.

I'd like to propose a test for the exceptional sizes though: asosedkin/gnutls@4894bf17

marked the checklist item No obvious mistakes in the code as completed

marked the checklist item There is a test suite reasonably covering new functionality or modifications as completed

marked the checklist item This feature/change has adequate documentation added as completed

marked the checklist item There is a test suite reasonably covering new functionality or modifications as incomplete

added 1 commit

• c0c532b4 - tests: add fips-rsa-sizes

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resolved all threads

approved this merge request

mentioned in commit 66f51189

merged

Thanks for the review!