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This adds initial support for runtime-configurable encryption and
post-quantum Key Encapsulation Mechanisms (KEMs) and authentication
(ML-DSA).
Supported key exchange algorithms:
ECDH: prime256v1, secp384r1, secp521r1, X25519, X448
Finite Field DH: ffdhe2048, ffdhe3072, ffdhe4096
ML-KEM (FIPS 203): ML-KEM-512, ML-KEM-768, ML-KEM-1024
Hybrid KEMs: X25519MLKEM768, X448MLKEM1024
Supported ciphers:
AEAD: aes-128-gcm, aes-192-gcm, aes-256-gcm, chacha20-poly1305
CTR: aes-128-ctr, aes-192-ctr, aes-256-ctr
Supported HKDFs:
sha256, sha384, sha512, sha3-256, sha3-384, sha3-512,
blake2b512, blake2s256
Supported Digests for DSA:
sha256, sha384, sha512, sha3-256, sha3-384, sha3-512,
blake2b512, blake2s256
PQC support requires OpenSSL 3.4.0+ and is detected automatically via
CMake. A DISABLE_PQC option allows building without PQC even when
available.
KEMs differ from traditional DH in that they require asymmetric roles:
one party encapsulates to the other's public key. This creates a
coordination problem during simultaneous reconnection attempts. The
kem_mode configuration parameter resolves this by pre-assigning roles:
kem_mode=server # Server encapsulates (1-RTT, full forward secrecy)
kem_mode=client # Client encapsulates (0-RTT, cached server key)
The enc.conf file format supports:
kex=<algorithm> # Key exchange algorithm
cipher=<algorithm> # Symmetric cipher
kdf=<KDF> # Key derivation function
digest=<digest> # Digest for DSA
kem_mode=<mode> # Server (default) or client
none # Disable encryption
The OAP protocol is extended to negotiate algorithms and exchange KEX
data. All KEX messages are signed using existing authentication
infrastructure for integrity and replay protection.
Tests are split into base and _pqc variants to handle conditional PQC
compilation (kex_test.c/kex_test_pqc.c, oap_test.c/oap_test_pqc.c).
Bumped minimum required OpenSSL version for encryption to 3.0
(required for HKDF API). 1.1.1 is long time EOL.
Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>
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