ML-DSA: Add optional context to signing and verification

[mjdemilliano]

No description provided.

[embhorn]

@mjdemilliano is an approved contributor

[Copilot]

Pull request overview

This PR adds optional “context” (ctx) support to ML-DSA (Dilithium) signing and verification, enabling domain separation when using the wolfSSL context-aware APIs.

Changes:

• Extend MlDsaPrivate.sign() and _MlDsaBase.verify() with an optional ctx argument and route to *_ctx_msg wolfCrypt APIs when provided.
• Add tests covering sign/verify behavior with correct/incorrect context.
• Extend the CFFI bindings to include wc_dilithium_sign_ctx_msg and wc_dilithium_verify_ctx_msg.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
wolfcrypt/ciphers.py	Adds ctx parameter and switches between ctx/non-ctx wolfCrypt functions.
tests/test_mldsa.py	Adds coverage for context-aware signing and verification.
scripts/build_ffi.py	Declares the new ctx-aware wolfCrypt APIs in the FFI cdef.

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[danielinux]

Please address copilot's commends

[mjdemilliano]

Addressed Copilot comments.

Fixed