[openssl/openssl] a94aa9: CCM: authenticate empty Final when payload Update ...

  Branch: refs/heads/openssl-3.6
  Home:   https://github.com/openssl/openssl
  Commit: a94aa9a2c798f050082f67eb5539701e69ec363f
      https://github.com/openssl/openssl/commit/a94aa9a2c798f050082f67eb5539701e69ec363f
  Author: Mounir IDRASSI <[email protected]>
  Date:   2026-08-21 (Fri, 21 Aug 2026)

  Changed paths:
    M providers/implementations/ciphers/ciphercommon_ccm.c.in

  Log Message:
  -----------
  CCM: authenticate empty Final when payload Update is skipped

CCM Final was routed through an update helper whose pointer-based
dispatch treats a NULL-input call as a no-op or a length declaration.
If an empty message skips payload Update, decryption can therefore skip
tag verification and encryption does not generate a tag.

Process an empty payload during Final only when the existing state flags
show that no payload operation took place. Route the NULL-input
EVP_Cipher() form through the same Final path.

Fixes #32253

Assisted-by: Codex:gpt-5.6-sol

(cherry picked from commit 493a46c61983195c2b49bfde75ffba0321e5e69d)
Reviewed-by: Milan Broz <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
Reviewed-by: Nikola Pajkovsky <[email protected]>
Merge-date: Fri Aug 21 09:54:29 2026
Merged-from: https://github.com/openssl/openssl/pull/32427


  Commit: 79239c8c3377f01b9d04d116f6557e94669e0bdd
      https://github.com/openssl/openssl/commit/79239c8c3377f01b9d04d116f6557e94669e0bdd
  Author: Mounir IDRASSI <[email protected]>
  Date:   2026-08-21 (Fri, 21 Aug 2026)

  Changed paths:
    M test/evp_extra_test.c

  Log Message:
  -----------
  test: cover CCM empty Final without a payload Update

Declare a zero payload length and supply AAD while deliberately omitting
the payload Update. Check that streaming and one-shot Final generate the
same tag, accept the correct tag, and reject a modified tag for every
available built-in CCM cipher.

Assisted-by: Codex:gpt-5.6-sol
Reviewed-by: Milan Broz <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
Reviewed-by: Nikola Pajkovsky <[email protected]>
Merge-date: Fri Aug 21 09:54:30 2026
Merged-from: https://github.com/openssl/openssl/pull/32427


Compare: https://github.com/openssl/openssl/compare/14492f979cdb...79239c8c3377

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