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// get encryptor and encryption stream DESCryptoServiceProvider encryptor = new DESCryptoServiceProvider(); CryptoStream encryptionStream = new CryptoStream(tempStream, encryptor.CreateEncryptor(key, iv), CryptoStreamMode.Write); // encrypt data encryptionStream.Write(sourceDataBytes, 0, sourceDataBytes.Length); encryptionStream.FlushFinalBlock(); // put data into byte array byte[] encryptedDataBytes = tempStream.GetBuffer(); // convert encrypted data into string return Convert.ToBase64String(encryptedDataBytes, 0, (int)tempStream.Length); } catch { throw new StringEncryptorException( "Unable to encrypt data."); } } 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); // get source memory stream and fill it MemoryStream tempStream = new MemoryStream(encryptedDataBytes, 0, encryptedDataBytes.Length);

There are two new components in this project: a screw terminal and a piezo sounder. You use the screw terminal because the wires from your piezo sounder or disc are too thin and soft to insert into the breadboard. The screw terminal has pins on it that allow you to push it into a breadboard. The piezo sounder or piezo disc (see Figure 4-2) is a simple device made up of a thin layer of ceramic bonded to a metallic disc.

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// get decryptor and decryption stream DESCryptoServiceProvider decryptor = new DESCryptoServiceProvider(); CryptoStream decryptionStream = new CryptoStream(tempStream, decryptor.CreateDecryptor(key, iv), CryptoStreamMode.Read); // decrypt data StreamReader allDataReader = new StreamReader(decryptionStream); return allDataReader.ReadToEnd(); } catch { throw new StringEncryptorException( "Unable to decrypt data."); } } } } 3. Add a new web page to the root of BalloonShop called SecurityLibTester2.aspx with the usual options and code as follows: <%@ Page Language="C#" MasterPageFile="~/BalloonShop.master" AutoEventWireup="true" CodeFile="SecurityLibTester2.aspx.cs" Inherits="SecurityLibTester2" Title="SecurityLib Test Page 2" %> <asp:Content ID="Content1" ContentPlaceHolderID="contentPlaceHolder" runat="Server"> Enter data to encrypt:<br /> <asp:TextBox ID="encryptBox" runat="server" /> <br /> Enter data to decrypt:<br /> <asp:TextBox ID="decryptBox" runat="server" /> <br /> <asp:Button ID="processButton" runat="server" Text="Process" OnClick="processButton_Click" /> <br /> <asp:Label ID="result" runat="server" /> </asp:Content>

The differences mostly lie within onCreate(). We get an InputStream for the XML file (getResources().openRawResource(R.raw.words)), then use the built-in XML parsing logic to parse the file into a DOM Document, pick out the word elements, and then pour the value attributes into an ArrayList for use by the ArrayAdapter. The resulting activity looks the same as before, as shown in Figure 23 1, since the list of words is the same, just relocated.

Figure 4-2. A piezo disc and Arduino (Image courtesy of Patrick H. Lauke/splintered.co.uk) Piezoelectric materials, which are made up of crystals and ceramics, have the ability to produce electricity when mechanical stress is applied to them. The effect finds useful applications such as the production and detection of sound, generation of high voltages, electronic frequency generation, microbalances, and ultra fine focusing of optical assemblies.

4. Modify the code in SecurityLibTester2.aspx.cs in SecurityLibTester as follows: using System; ... using System.Text; using SecurityLib; public partial class SecurityLibTester2 : System.Web.UI.Page { ... protected void processButton_Click(object sender, EventArgs e) { string stringToEncrypt = encryptBox.Text; string stringToDecrypt = decryptBox.Text; string encryptedString = StringEncryptor.Encrypt(stringToEncrypt); if (stringToDecrypt == "") { stringToDecrypt = encryptedString; } string decryptedString = StringEncryptor.Decrypt(stringToDecrypt); StringBuilder sb = new StringBuilder(); sb.Append("Encrypted data: "); sb.Append(encryptedString); sb.Append("<br />Decrypted data: "); sb.Append(decryptedString); result.Text = sb.ToString(); } } 5. Browse to BalloonShop/SecurityLibTester2.aspx, enter a string to encrypt in the first text box (leave the second text box blank unless you have a ready-encoded string to decrypt), and click Process. The result is shown in Figure 12-2.

Of course, there are even easier ways to have XML files available to you as prepackaged files, such as by using an XML resource, as discussed in 20. However, while this example used XML, the file could just as easily have been a simple one-word-perline list or in some other format not handled natively by the Android resource system.

The effect is also reversible; if an electric field is applied across the piezoelectric material, it will cause the material to change shape (by as much as 0.1 percent in some cases). To produce sounds from a piezo disc, an electric field is turned on and off very fast to make the material change shape; this causes an audible click as the disc pops out and back in again (like a tiny drum). By changing the frequency of the pulses, the disc will deform hundreds or thousands of times per second, causing the buzzing sound. By changing the frequency of the clicks and the time in between them, specific notes can be produced. You can also use the piezo s ability to produce an electric field to measure movement or vibrations. In fact, piezo discs are used as contact microphones for guitars or drum kits. You will use this feature of a piezo disc in Project 13 when you make a knock sensor.

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