| A simple utility class that encrypts/decrypts public key based
encryption files.
To encrypt a file: KeyBasedFileProcessor -e [-a|-ai] fileName publicKeyFile.
If -a is specified the output file will be "ascii-armored".
If -i is specified the output file will be have integrity checking added.
To decrypt: KeyBasedFileProcessor -d fileName secretKeyFile passPhrase.
Note: this example will silently overwrite files, nor does it pay any attention to
the specification of "_CONSOLE" in the filename. It also expects that a single pass phrase
will have been used.
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