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Make RSA modulus size restrictions configurable

Daiki Ueno requested to merge dueno/gnutls:wip/dueno/rsa-key-sizes into master

This series changes how the library allows/approves RSA operations based on key sizes. Namely:

  • any operation with key size shorter than 1024 bits is disallowed
  • in FIPS140 mode, signature verification is approved for either key sizes longer than 2048 bits, or known key sizes between 1024 bits and 2048 bits (1024, 1280, 1536, and 1792 bits)
  • in FIPS140 mode, signature and key generation are only approved for key sizes longer than 2048 bits

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
Edited by Daiki Ueno

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