Examples

   1.$ DECRYPT BOSTON MYKEY

     Decrypts the file name BOSTON using the DES key, MYKEY, and the
     DESCBC algorithm.

   2.$ DECRYPT CHIGAGO.ENC KEY2 /KEY=AESECB256 /OUT=CHICAGO.DEC

     Decrypts the file named CHICAGO.ENC using the AES key, KEY2,
     and the AESECB256 algorithm, renaming the decrypted output file
     to CHICAGO.DEC, the original plaintext file.