Composite ML-KEM for use in Cryptographic Message Syntax (CMS)

Composite ML-KEM defines combinations of ML-KEM with RSA-OAEP, ECDH, X25519, and X448. This document specifies the conventions for using Composite ML-KEM algorithms with the Cryptographic Message Syntax (CMS) using the KEMRecipientInfo structure defined in “Using Key Encapsulation Mechanism (KEM) Algorithms in the Cryptographic Message Syntax (CMS)” (RFC 9629).