crypto Directory Reference

Files
	aes_core.hpp
	AES-256 block cipher implementation (FIPS-197).
	aes_ctr.hpp
	AES-256-CTR stream cipher implementation (NIST SP 800-38A).
	aes_gcm.hpp
	AES-256-GCM authenticated encryption (NIST SP 800-38D).
	cipher_interface.hpp
	Abstract cipher interface, GCM/CTR adapters, CipherFactory, and platform CSPRNG.
	hkdf.hpp
	HKDF key derivation (RFC 5869) using HMAC-SHA256.
	hsm_client_stub.hpp
	key_metadata.hpp
	Key material, encryption configuration, and TLV serialization for Parquet Modular Encryption (PME).
	pme.hpp
	Parquet Modular Encryption (PME) orchestrator – encrypts and decrypts Parquet file components (footer, column metadata, data pages).
	post_quantum.hpp
	Post-quantum cryptography: Kyber-768 KEM, Dilithium-3 signatures, X25519 ECDH, and HybridKem (Kyber+X25519) for Parquet encryption.
	sha256.hpp
	SHA-256 hash function (NIST FIPS 180-4).
	sha512.hpp
	SHA-512 hash function (NIST FIPS 180-4).