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Dim buffer As New MemoryStream Dim encStream As New CryptoStream(buffer, algorithm, CryptoStreamMode.Write) 'Write data to encryption stream which stores it in the buffer Try encStream.Write(byteArrayToEncrypt, 0, byteArrayToEncrypt.Length) encStream.FlushFinalBlock() Catch ex As Exception Throw New IOException("Could not encrypt data", ex) Finally encStream.Close() End Try Return buffer.ToArray() End Function '*************************************************************************** Public Shared Function DecryptString(ByVal valueToDecrypt As String, _ ByVal type As EncryptionAlgorithmType, ByRef key As Byte(), _ ByRef IV As Byte()) As String Dim encoder As New ASCIIEncoding Dim value = Convert.FromBase64String(valueToDecrypt) Dim decrypted = DecryptByteArray(value, type, key, IV) Return encoder.GetString(decrypted) End Function '*************************************************************************** Public Shared Function DecryptByteArray(ByVal byteArrayToEncrypt As Byte(), _ ByVal type As EncryptionAlgorithmType, ByRef key As Byte(), _ ByRef IV As Byte()) As Byte() Dim algorithm As ICryptoTransform algorithm = GetCrytoTransfomer(type, CryptoDirection.Decrypt, key, IV) Dim buffer As New MemoryStream Dim decStream As New CryptoStream(buffer, algorithm, CryptoStreamMode.Write) 'Write data to encryption stream which stores it in the buffer Try decStream.Write(byteArrayToEncrypt, 0, byteArrayToEncrypt.Length) decStream.FlushFinalBlock() Catch ex As Exception Throw New IOException("Could not decrypt data", ex) Finally

The Encryption class uses a number of classes from the System.Security.Cryptography namespace, the ASCIIEndoding object from the System.Text namespace, and the MemoryStream class from the System.IO namespace. All the namespaces are imported at the top of the file to keep the code succinct. In the actual class itself, there are two enumerations. EncryptionAlgorithmType contains a listing of all supported encryption algorithms in the .NET Framework. This enumeration makes it easy to choose which algorithm you want to use to encrypt and decrypt information. The Visual Studio IDE pops up a listing of the enumerations when you use encrypt and decrypt functionality in the encryption library. CryptoDirection contains values that allow you to define whether you want to return an encrypting or decrypting ICryptoTransform object from the GetCrytoTransfomer method (discussed shortly).

Note As noted in previous chapters, Google doesn t support this type of native development, but it seems

setURL(String)

Before you can encrypt or decrypt data, you need to have an object that exposes the encryption algorithm you want to use. GetAlgorithm allows you to pass in an EncryptionAlgorithmType enumeration named type identifying which algorithm you want to use. The function then uses a SELECT statement to determine which type you requested and returns the appropriate SymmetricAlgorithm object for that algorithm.

Each algorithm requires encryption keys and initialization vectors to be a certain size. The GenerateKey and GenerateIV functions may be used to create randomly generated keys and initialization vectors appropriately sized for the specified algorithm. The function accepts an EncryptionAlgorithmType parameter named type identifying the algorithm for which you want to create a key or initialization vector. Each function acquires an appropriate algorithm object using the GetAlgorithm function, calls the GenerateKey or GenerateIV method of that algorithm object, and then returns the key or initialization vector that was generated. You can use these functions to generate keys and initialization vectors for storage in your application s Web.config file. Simply create a trash page in your application and use the GenerateKey and GenerateIV functions to create a key and an initialization vector. Make sure to convert them to base64 strings using the Convert.ToBase64String function, and then store them in Web.config in your application. Delete the trash page from your application and

Google is being pushed by the overwhelming number of 3D games being ported to the iPhone and other mobile devices. So much so, that Google has recently released the Android NDK, a set of tools and header files for native development, introduced in 1.

encrypt the Web.config section containing the key and initialization vector. Any time you need the key or initialization vector, acquire it from Web.config, convert it from a base64 string to a byte array using Convert.FromBase64String, and use it in the encryption library routines.

The URL defaults to an arbitrary value. The user must specify a proper JDBC URL. The user must specify a valid user name to access the database.

Before you can encrypt or decrypt data, you need to acquire an ICryptoTransform object This object is responsible for encrypting or decrypting data as it is written to a memory stream GetCryptoTransfomer is responsible for providing the appropriate encryption or decryption transformer from a specific algorithm and setting up default encryption keys and initialization vectors if none are provided GetCryptoTransformer accepts four parameters: type is an EncryptionAlgorithmType defining the algorithm from which the transformer should be acquired direction is a CryptoDirection defining whether to acquire an encryption or a decryption transformer key and IV are both byte arrays identifying the key and initialization vector the transformer should use during processing Notice that the key and IV parameters are passed ByRef because they could be given randomly generated values if they are passed into the function without values (that is, Nothing).