Decrypts a small amount of data on a decrypt stream.

                                   NOTE

       To use AES for one record ciphers, you must first create
       an AES key, which is stored in the logical name table
       (encrypted). The key name of an AES key is specified as
       an address of a descriptor that contains the ASCII text for
       the selected AESmmmkkk (mode and key size) algorithm, for
       example, AESCBC256. The input and output buffers (descriptor
       addresses) are also provided.

    Format

      ENCRYPT$DECRYPT_ONE_RECORD  input, output, key-name, algorithm