Introduce a complete SDK-level hybrid KEX framework combining classic
(DH/ECDH/XDH) and post-quantum (KEM adapter) agreement contexts.
Key additions:
- HybridKexContext and HybridKexContexts for hybrid handshake
orchestration over existing AgreementContext and
MessageAgreementContext APIs
- HybridKexProfile, HybridKexTranscript and HybridKexExporter providing
HKDF-based key derivation, transcript binding and key schedule support
- HybridKexPolicy for optional security strength and output-length
gating
- HybridKexBuilder offering a fluent, professional API for constructing
CLASSIC_AGREEMENT + KEM_ADAPTER and PAIR_MESSAGE + KEM_ADAPTER
variants
- Comprehensive JUnit tests and documented demo illustrating both hybrid
modes
No changes to core cryptographic APIs; all hybrid logic is implemented
as additive functionality in the SDK layer.
Signed-off-by: Leo Galambos <lg@hq.egothor.org>
Leo Galambos
55da24735f
