Warren 76f707a31d Fix SSH X25519 shared secret encoding for exchange hash ...

CRITICAL BUG FIX (RFC 8731 Section 3.1):
- X25519 output is little-endian
- SSH exchange hash requires big-endian encoding
- Reverse shared_secret bytes before mpint encoding
- Fix exchange hash computation in kex_exchange.rs
- Fix key derivation in crypto.rs
- Fix KEXINIT cookie to use random bytes

This resolves the fundamental encoding mismatch that caused
'Corrupted MAC on input' errors.

Next: verify signature verification after exchange hash fix.

2026-06-14 19:13:18 +08:00

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