[gnutls-devel] GnuTLS | cipher: limit plaintext length supplied to AES-GCM (!1603)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1603

Project:Branches: dueno/gnutls:wip/dueno/aes-gcm-rekey-limit to gnutls/gnutls:master
Author:   Daiki Ueno
Assignee: Daiki Ueno



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
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [x] 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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