ASN.1 type ContentEncryptionAlgorithmIdentifier is defined as follows:

    ContentEncryptionAlgorithmIdentifier ::= SEQUENCE {
       algorithm   ALGORITHM.&id({ContentEncryptionAlgorithms}),
       parameters  ALGORITHM.&Type({ContentEncryptionAlgorithms}{@algorithm})  OPTIONAL
    }

    ContentEncryptionAlgorithms ALGORITHM ::= {

       ...  -- Expect additional content encryption algorithm objects --
    }
    
    ALGORITHM ::= CLASS {
       &id    OBJECT IDENTIFIER  UNIQUE,
       &Type  OPTIONAL
    }
      WITH SYNTAX { OID &id [ PARMS &Type ] }