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In the case that the user asks to create a key, the program creates a new file using a FileOutputStream object, and writes the key returned by the KeyGenerator s generateKey() method to the file The KeyGenerator class in Java should be used to construct cryptographically random keys that are not weak (see Section 142 for more information about weak keys) If the user requests encryption or decryption, the main program simply calls the encrypt() or decrypt() method, respectively, after initializing the AESEncrypter object with the key read from the key file (If the user did not specify a valid operation, a usage error is printed) From the preceding example, you can see how it s possible to practically implement a flexible encryption tool in just a few lines of code With just this small program, you can encrypt and decrypt any file.

Later you ll see how to create your own validator When you are creating a validator, for maximum flexibility you should use the message function: messages = { 'key': 'my message (with a %(substitution)s)', } def validate_python(self, value, state): raise Invalid(selfmessage('key', substitution='apples'), value, state) Most validators support the following options (including your own validators, if you subclass from FancyValidator): if_empty: If set, then this value will be returned if the input evaluates to false (an empty list, empty string, None, and so on), but not a 0 or False objects This applies only to to_python() not_empty: If True, then if an empty value is given, this raises an error (both with to_python() and also from_python() if validate_python is True)..

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drawContents( &painter, recttranslated( -recttopLeft() ) ); painterrestore(); painterdrawRect( rect ); As shown in Figure 7-13, the entire contents of the text document would not fit into the given rectangle Once again, there is a way to determine the height needed by the text In this case, use the height property of the size property from the QTextDocument In the following source code, you use this height to determine the size of the gray rectangle drawn below the rendered text document This rectangle shows how long the text really is recttranslate( 0, 160 ); rectsetHeight( docsize()height()-160 ); paintersetBrush( Qt::gray ); painterdrawRect( rect );.

However, AESEncrypter does not provide integrity protection for the encrypted file, and in the real world you would add on a message authentication code (MAC) and use a key derivation function to get a different MAC and encryption key Aside from the limitation of not automatically providing integrity protection, the AESEncrypter class is written such that it can be used in other programs to encrypt and decrypt not only files, but also any data that can be transferred over a stream, including data that is exchanged between clients and servers over network sockets As you can imagine, one major challenge is securely distributing the key file to the client and server In s 13 and 14, we discuss asymmetric cryptography and key exchange, which helps address the key distribution problem In this chapter, we complete our discussion of symmetric cryptography with an introduction to stream ciphers..

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