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While it might be interesting to see the entire modification history, the fact that we ve messed up the Identifier is bad. Example 3-15 was able to do this because the SpeedInMilesPerHour property is part of the Plane class, so it can still use the private setter. We can fix this (up to a point) by making the property read-only rather than merely making the setter private, we can leave it out entirely. However, we can t just write the code in Example 3-16.

Now that we have covered block ciphers and CBC, we provide a simple Java code example that can encrypt and decrypt using AES in CBC mode. Our code will show you how to practically use symmetric encryption, and will provide an example that shows it in action. How AES encryption is done may differ from one language to another, but our example will give you a general flavor as to what code that uses cryptographic libraries looks like. Our Java class is called AESEncrypter. It is a command-line utility that can create an AES key, encrypt with the key, and decrypt with the key. The first argument to the command-line tool specifies what it should do: create a key, encrypt, or decrypt. It stores keys in files, and accepts the name of the key file as the second parameter on the command line. It accepts its input from stdin and writes its output to stdout. The following are some example commands that Alice might use to generate a key and encrypt: $ java com.learnsecurity.AESEncrypter createkey mykey $ echo "Meet Me At Central Park" | java com.learnsecurity AESEncrypter encrypt mykey > ciphertext

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class Plane { // Wrong! public string Identifier { get; }

}

That won t work because there s no way we could ever set Identifier not even in the constructor. Auto properties cannot be read-only, so we must write a getter with code. Example 3-17 will compile, although as we re about to see, the job s not done yet.

class Plane { public Plane(string newIdentifier) { _identifier = newIdentifier; } public string Identifier { get { return _identifier; } } private string _identifier; ...

}

Note that the generated key is stored in a file called mykey, and the encrypted text is stored in the ciphertext file. (We do not show the contents of the ciphertext file, as it is made up of nonprintable binary data, and will differ depending upon the key that is generated.) Once Alice provides the mykey file to Bob over a secure channel, she can then safely send the ciphertext file (or any other files encrypted with the same key) to Bob over an insecure channel. Once Bob receives ciphertext, he can use the AESEncrypter program to decrypt the text as follows: $ java com.learnsecurity.AESEncrypter decrypt mykey < ciphertext Meet Me At Central Park The entire code for the utility is shown here: package com.learnsecurity; import import import import import java.security.*; java.security.spec.*; javax.crypto.*; javax.crypto.spec.*; java.io.*;

This turns out to give us two problems. First, the original constructor from Example 3-6 would no longer compile it set Identifier, but that s now read-only. That was easy to fix, though Example 3-17 just sets the explicit backing field we ve added. More worryingly, this hasn t solved the original problem the developer who wrote the code in Example 3-15 has cleverly realized that he can fix his code by doing exactly the same thing as the constructor. As Example 3-18 shows he has just used the _identifier field directly.

public double SpeedInMilesPerHour { get { return SpeedInKilometersPerHour / kilometersPerMile; } set { _identifier += ": speed modified to " + value; Console.WriteLine(Identifier); SpeedInKilometersPerHour = value * kilometersPerMile; } }

Most blocks retrieve data from external sites and services. If you call a web site that resides on a domain other than Popfly, the browser s security will either prompt the user for permission or throw an error with no prompting. To prevent these situations, Popfly provides two helper functions for blocks to get data to and from any server: getXml and getText. The getXml helper function is used to retrieve or post XML data and takes the following form: <xmlObject> = environment.GetXml(<url>). It requires the following parameters: <xmlObject> is the HTTP response loaded and parsed into an XML document. <url> is the URL for which the HTTP request is to be made to, for example http:// blogs.msdn.com/eric_griffin/rss.aspx Tags=silverlight e.g.: var url = "http://soapbox.msn.com/rss.aspx searchTerm="+searchTerm; var resultXML = environment.getXml(url);. The getText helper method retrieves or posts text data and takes the following form: <text> = environment.GetText(<url>). It accepts the following parameters: <text> is the body of the HTTP response. <url > is the URL for which the http request is to be made, for example, http:// blogs.msdn.com/eric_griffin/. Both getXml and getText are key functions you have to use when retrieving data from external services. If you are interested in diving deeper into how these functions work, you need to examine the code in the Popfly Block SDK, which I will be cover in the next chapter.

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