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nettle: mark non-compliant RSA-PSS salt length to be not-approved

Daiki Ueno requested to merge dueno/gnutls:wip/dueno/rsa-pss-saltlen into master

According to FIPS 186-5 5.4, the salt length must be in the range between 0 and the hash length inclusive. While the use of those salt lengths is still allowed for compatibility, it is reported as non-approved operation through FIPS service indicator.

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 Alexander Sosedkin

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