Create a cryptographic stream that reads and/or writes to the given binary stream.

:input

If true, allow input operations. This is the default if neither :input or :output is specified.

:output

If true, allow output operations.

:element-type

Indicates the element type to use. Only the character and '(unsigned-byte 8) types are supported. The default is to create a binary '(unsigned-byte 8) stream.

:external-format

The external character format to use. The default value is :default for which the value of ext:*default-external-format* is used.

:buffering

Indicates the kind of output buffer flushing to use which may be one of: :none, :line, or the default :full. Line buffering is only applicable to character streams.

:password

The cipher password.

:cipher

The cipher name to use for encryption.

:close-stream-p

When true, which is the default, the target stream is closed when this stream is closed.

:pathname

When true, the returned stream will be a subclass of the class file-stream. This should generally be true if the stream is a file-stream.