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GOSTR341194, RIPEMD160: mark as insecure for digital signatures

Nikos Mavrogiannopoulos requested to merge nmav/gnutls:tmp-mark-gost94-as-broken into master

Although there are no practical attacks known on the algorithms, one is known to be weaker than its theoretical strength, legacy and the other has no practical uses for Internet PKI. Mark them as insecure to reduce the attack surface.

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 Dmitry Baryshkov

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