Streams, File Access, and Serialization in .NET

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Streams, File Access, and Serialization
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Resolve the DNS name to an IP Address. by taking the first address in the resolved list Dim host As IPAddress = Dns.Resolve(strServer).AddressList(0) Dim EPhost As New IPEndPoint(host, 80) Creates the Socket for sending data over TCP Dim sokt As New Socket( AddressFamily.InterNetwork, _ SocketType.Stream, _ ProtocolType.Tcp) getCmd = String.Format( _ GET / HTTP/1.1{0}Host: {1}{0}Connection: Close{0}{0} , _ ControlChars.CrLf, strServer) getBytes = enc.GetBytes(getCmd) Connects to the host using IPEndPoint. sokt.Connect(EPhost) If Not sokt.Connected Then strRespose = Cannot connect to host: & strServer Response.Write(strRespose) End If Dim s1 As New NetworkStream(sokt, True) Dim s1options As String s1options = String.Format( _ s1 - CanRead:{0} CanSeek:{1} CanWrite:{2}<br> , _ s1.CanRead, _ s1.CanSeek, _ s1.CanWrite) Response.Write(s1options) s1.Write(getBytes, 0, getBytes.Length) Dim strOutput As String = Dim bInput(10) As Byte Dim count As Integer count = s1.Read(bInput, 0, bInput.Length) Do While (count > 0) strOutput &= _ System.Text.Encoding.UTF8.GetString(bInput, 0, count) count = s1.Read(bInput, 0, bInput.Length) Loop s1.Close() Response.Write(strOutput) End Sub
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The browser output, shown in Figure 10.8, demonstrates that the stream s CanRead and CanWrite properties are true, while the CanSeek property is set to false. An attempt to seek will cause an exception to be thrown. This stream operates much like the previous streams that have been examined, except that more setup is required in order to communicate over the network.
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Figure 10.8 An example of using the NetworkStream to read a Web page.
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The CryptoStream class provides the ability to move and process data from one stream to another. This stream does not have an endpoint. This class inherits all the methods in the Stream class and has additional cryptographic-centric properties and methods. CryptoStream can be used to encrypt any data. The CryptoStream provides the ability to perform symmetrical encryption with little extra work. Symmetrical encryption is done by sharing a secret. In this case, the secret will be the initialization vector (IV) and the key. Depending on the usage, it may be desirable to regenerate the IV and key each time that a session has started, or it may be desirable to store the IV and key for repeated use.
CryptoStream Constructor
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The following parameters may be passed to the constructor when opening a CryptoStream for encryption or decrytpion. Stream The stream that is passed to the constructor is the input (decryption) or output (encryption) stream. SymmetricAlgorithm The SymmetricAlgorithm class can be used to create a CryptoServiceProvider. This is an abstract class and, although this can be used to create the
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TripleDESCryptoServiceProvider, it may be better to use one of the explicit CryptoServiceProvider classes. The following CryptoServiceProvider classes are available:
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ICryptoTransform The CryptoServiceProvider class contains a Create and CreateDecryptor method. Each of these methods returns an object that implements the ICryptoTransform interface, which is used to perform encryption and decryption.
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CryptoStream Encryption Example
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The following example shows how encryption may be done by encrypting the words Encrypted Hello World and placing them in a file called c:\test.txt.
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Private Sub Button7_Click( _ ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles Button7.Click Dim s1 As New FileStream( _ c:\test.txt , FileMode.Create) Dim s1options As String s1options = String.Format( _ s1 - CanRead:{0} CanSeek:{1} CanWrite:{2}<br> , _ s1.CanRead, _ s1.CanSeek, _ s1.CanWrite) Response.Write(s1options) Dim cryptoProvider As TripleDESCryptoServiceProvider cryptoProvider = TripleDESCryptoServiceProvider.Create() If Session( iv ) Is Nothing Then Session( iv ) = cryptoProvider.IV Session( key ) = cryptoProvider.Key txtIV.Text = Convert.ToBase64String(cryptoProvider.IV) txtKey.Text = Convert.ToBase64String(cryptoProvider.Key) End If Dim xfrm As ICryptoTransform xfrm = cryptoProvider.CreateEncryptor( _ Session( key ), Session( iv )) Dim c1 As New CryptoStream(s1, xfrm, CryptoStreamMode.Write) Dim c1options As String s1options = String.Format( _ c1 - CanRead:{0} CanSeek:{1} CanWrite:{2}<br> , _
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c1.CanRead, _ c1.CanSeek, _ c1.CanWrite) Response.Write(c1options) Dim b As Byte() b = System.Text.Encoding.Unicode.GetBytes( _ Encrypted Hello World ) c1.Write(b, 0, b.Length) c1.Close() s1.Close() End Sub
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This code creates a FileStream, then creates the TripleDESCryptoServiceProvider. The TripleDESCryptoServiceProvider will generate an IV and key, which must be recorded to decrypt the message. They are saved into Session variables. Next, the CreateEncryptor method is executed to produce an ICryptoTransform, and finally the CryptoStream is opened with the appropriate parameters. The browser output, shown in Figure 10.9, demonstrates that although the FileStream supports reading, writing, and seeking, the CryptoStream only supports writing.
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