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cipher: limit plaintext length supplied to AES-GCM

Daiki Ueno requested to merge dueno/gnutls:wip/dueno/aes-gcm-rekey-limit into master

According to SP800-38D 5.2.1.1, input data length of AES-GCM encryption function must be less than or equals to 2^39-256 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

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