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crypto-api: support SIV ciphers with encryptv2 functions

Daiki Ueno requested to merge dueno/gnutls:wip/dueno/siv-iov into master

The AES-SIV ciphers have a peculiarity that it prepends authentication tag to the generated ciphertext rather than appending. The gnutls_aead_cipher_encryptv2 previously was not able to cope with that and returned wrong authentication tag. This patch adds a new cipher flag GNUTLS_CIPHER_FLAG_TAG_PREFIXED to indicate it.

This also adds a new API gnutls_aead_cipher_set_key to reset key of the context, per request in #1217 (closed).

Fixes: #1312 (closed), #1217 (closed)

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 Zoltán Fridrich

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