`dcrypt_algorithms::ec::p384` provides safe-Rust P-384 field, scalar, and point
operations, canonical point decoding, caller-supplied key-generation
randomness, and the HKDF-SHA-384 helper used by dcrypt's ECDH KEM.
Use the typed `EcdhP384`, `EciesP384`, or `EcdsaP384` wrappers for those
constructions. Raw ECDH point output must be bound to a protocol transcript and
processed through an appropriate KDF before use as a key.