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The next section of code performs the actual encryption, writing the resultant byte array to the MemoryStream created earlier: // encrypt data encryptionStream.Write(sourceDataBytes, 0, sourceDataBytes.Length); encryptionStream.FlushFinalBlock(); The FlushFinalBlock call here is essential. Without this call, unwritten data might be left in the buffer of the CryptoStream. This call forces the stream writing to complete so that all the data you require is contained in the MemoryStream object. Next, you grab the data from the MemoryStream and place it into a byte array: // put data into byte array byte[] encryptedDataBytes = tempStream.GetBuffer(); Finally, you convert the resultant byte array into a string and return it: // convert encrypted data into string return Convert.ToBase64String(encryptedDataBytes, 0, (int)tempStream.Length); If anything goes wrong during this process, a StringEncryptorException exception is thrown: catch { throw new StringEncryptorException( "Unable to encrypt data."); } } Note that this exception class doesn t do very much, and you might think that just throwing a standard Exception would be good enough. However, by creating your own type, it s possible for Structured Exception Handling (SEH) code that uses this class to test for the specific type of this new exception, filtering out StringEncryptorException exceptions from others that might occur. TheDecrypt method is very similar to Encrypt. You start in the same way by initializing the key and IV before moving into a try...catch block and converting the source string into a byte array: public static string Decrypt(string sourceData) { // set key and initialization vector values byte[] key = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; byte[] iv = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8 }; try { // convert data to byte array byte[] encryptedDataBytes = Convert.FromBase64String(sourceData);

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This time, however, you need a stream that is filled with this source byte array because the CryptoStream will be reading from a stream rather than writing to one: // get source memory stream and fill it MemoryStream tempStream = new MemoryStream(encryptedDataBytes, 0, encryptedDataBytes.Length); The next code snippet is similar, although you use the CreateDecryptor method and CryptoStreamMode.Read mode to specify decryption: // get decryptor and decryption stream DESCryptoServiceProvider decryptor = new DESCryptoServiceProvider(); CryptoStream decryptionStream = new CryptoStream(tempStream, decryptor.CreateDecryptor(key, iv), CryptoStreamMode.Read); Finally, you get the decrypted data out of the CryptoStream using a StreamReader object, which handily allows you to grab the data straight into a string for returning. As with Encrypt, the last step is to add the code that throws a StringEncryptorException exception if anything goes wrong: // decrypt data StreamReader allDataReader = new StreamReader(decryptionStream); return allDataReader.ReadToEnd(); } catch { throw new StringEncryptorException( "Unable to decrypt data."); } } The client code for this class simply encrypts and decrypts data, demonstrating that things are working properly. The code for this is very simple, so it s not detailed here. Now that you have the StringEncryptor class code, the last step in creating the SecureLib library is to add the SecureCard class.

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Add the following to the code as well: private bool _issubmissionsuccess; private string _submissionerror; public bool IsSubmissionSuccess { get { return _issubmissionsuccess; } set { _issubmissionsuccess = value; } } public string SubmissionError { get { return _submissionerror; } set { _submissionerror = value; } } After you add these properties and field names, you can address the actual posting of the payment to PayPal The DoDirectPaymentResponseType class is instantiated, and the DoDirectPayment method of the PPInterface is called, which is the explicit call to submit the payment to the PayPal APIs The result of this transmission is then checked for either the success or the failure of the direct payment Upon the submission being returned, the IsSubmissionSuccess Boolean property is set to either true or false, and if there are any errors detected, the SubmissionError property is populated with the error message.

Listing 5-21. The <war> Task Assembles the Web Application s WAR File  <target name="package-web" depends="copy-web" description="Build the WAR"> <echo message="Building the WAR file"/> <war destfile="${appName.war}" basedir="${build.web.root}" webxml="${src.web.conf}/web.xml"/> </target>

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1. Add a new class to the SecurityLib directory called SecureCardException.cs with code as follows: using System; namespace SecurityLib { public class SecureCardException : Exception { public SecureCardException(string message) : base(message) { } } } 2. Add another new file to the SecurityLib directory called SecureCard.cs with code as follows: using using using using System; System.Collections.Generic; System.Text; System.Xml;

Now that you are done with this exercise, users have the ability to submit a direct payment to PayPal by means of the supplied APIs and web service You ll now move along to the remaining sections of the chapter that will outline how to assemble the entire process..

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