Warren 3575ab7e66 Implement Phase 1: AES-256-GCM algorithm negotiation and cipher mode setting ...

Performance optimization Phase 1 implementation:
- Add aes-gcm crate dependency (v0.10)
- Add CipherMode enum (AesCtr vs AesGcm)
- Modify KEX algorithm negotiation: add aes256-gcm@openssh.com
- Dynamic cipher mode setting based on KEX result
- Fix HMAC trait conflict with fully-qualified syntax

Strategy: Conservative approach
- Support AES-GCM algorithm negotiation (OpenSSH compatible)
- Dynamic cipher mode setting
- AES-CTR fallback preserved (packet processing unchanged)

Next steps:
- Test OpenSSH client AES-GCM negotiation
- Implement AES-GCM packet processing if needed
- Continue to Phase 4 (parallel encryption)

2026-06-19 10:10:53 +08:00

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