Fixes for AF-ALG code paths and add CI test

[JacobBarthelmeh]

No description provided.

[Copilot]

Pull request overview

This pull request tightens correctness of the Linux AF_ALG AES-GCM implementation by ensuring the AF_ALG operation (encrypt vs decrypt) is set on every call when reusing an Aes context, and adds CI coverage so these kernel-offload paths are exercised continuously.

Changes:

• Add an AES-GCM regression test that reuses a single Aes context across encrypt → decrypt → encrypt without re-setting the key.
• Fix AF_ALG AES-GCM to always set the AF_ALG operation control message on every encrypt/decrypt call.
• Add a dedicated GitHub Actions workflow to build/test AF_ALG configurations and preflight kernel algorithm availability.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
wolfcrypt/test/test.c	Adds an AES-GCM “reuse context across directions” regression test and runs it from aesgcm_default_test().
wolfcrypt/src/port/af_alg/afalg_aes.c	Ensures AF_ALG operation selection is refreshed per AES-GCM call when reusing the same socket/context; updates related comments.
doc/dox_comments/header_files/aes.h	Documents the Xilinx AF_ALG combined ciphertext+tag buffer behavior and alignment expectations for GCM encrypt/decrypt.
.github/workflows/afalg.yml	Introduces CI that preflights AF_ALG kernel support and runs parallel out-of-tree builds/tests with --enable-afalg.

Suppressed comments (1)

wolfcrypt/src/port/af_alg/afalg_aes.c:809

• Same as above: the warning comment says sz | 16 bytes but this should be sz + 16 bytes to describe the required buffer sizing for the combined ciphertext+tag path.

 *          and out buffers are large enough to hold cipher text and tag. That is
 *          sz | 16 bytes. The in buffer has tag appended even though it is
 *          const for this wolfSSL API, and sz | 16 bytes are read back into the
 *          out buffer. The input and output buffer is expected to be 64 bit
 *          aligned.

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[github-actions]

MemBrowse Memory Report

linuxkm-pie

• Data: __patchable_function_entries +8 B (+0.0%, 26,576 B)

linuxkm-standard

• Data: __patchable_function_entries +8 B (+0.0%, 49,384 B)
  No memory changes detected for:
• gcc-arm-cortex-m0plus
• gcc-arm-cortex-m3
• gcc-arm-cortex-m4
• gcc-arm-cortex-m4-baremetal
• gcc-arm-cortex-m4-crypto-only
• gcc-arm-cortex-m4-dtls13
• gcc-arm-cortex-m4-min-ecc
• gcc-arm-cortex-m4-openssl-compat
• gcc-arm-cortex-m4-pkcs7
• gcc-arm-cortex-m4-pq
• gcc-arm-cortex-m4-rsa-only
• gcc-arm-cortex-m4-sp-math
• gcc-arm-cortex-m4-tls12
• gcc-arm-cortex-m4-tls13
• gcc-arm-cortex-m7
• gcc-arm-cortex-m7-pq
• gcc-arm-cortex-m7-tls13
• stm32-sim-stm32h753