Add per-session ephemeral X25519 key exchange#3
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Each connection now establishes a fresh ephemeral X25519 keypair, signed with the shared Ed25519 key and exchanged in the TCP handshake (new Security-Ephemeral-Key and Security-Ephemeral-Sig headers). The session key is derived from the ephemeral Diffie-Hellman output bound to a transcript of both ephemeral public keys and the shared identity, giving a unique key per session and forward secrecy, and proving each peer holds the private key rather than merely knowing the public one. Adds LSLSecurity::reset() so the process-global security singleton can be returned to a clean state between tests, and C++ unit tests covering keypair freshness, derivation symmetry, per-session key uniqueness, and ephemeral-key signature verification.
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Summary
Establishes a fresh ephemeral X25519 keypair for every connection, signed with the shared Ed25519 key and exchanged in the TCP handshake (new
Security-Ephemeral-Key/Security-Ephemeral-Sigheaders). The session key is derived from the ephemeral Diffie-Hellman output bound to a transcript of both ephemeral public keys and the shared identity.Benefits:
Also adds
LSLSecurity::reset()to return the process-global security singleton to a clean state for test isolation.Test plan
cmake -DLSL_SECURITY=ON -DLSL_UNITTESTS=ON -DLSL_SECURITY_TOOLS=ON;ctest.