nx_hmac_sha384.nx

hmac_sha384.nx -- HMAC-SHA-384 (RFC 2104 / FIPS 198-1). license_tier: INDEPENDENT_REDERIVE genealogy_id: international-research-sources/nist/fips_198_1 Parallel to hmac.nx but keyed on SHA-384 instead of SHA-256. Required for TLS 1.3 cipher suites that negotiate SHA-384 in the key schedule (e.g. TLS_AES_256_GCM_SHA384). Differences from hmac.nx: - Block size B = 128 bytes (SHA-384 / SHA-512 block), not 64. - Hash output = 48 bytes (SHA-384), not 32. - Key-pre-hash uses sha384_digest for oversized keys. Key processing (RFC 2104) remains identical in structure: K' = H(K) if len(K) > B K' = K || zeros if len(K) < B K' = K if len(K) == B ipad / opad bytes XOR'd against K' block.