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// Signing Step 3: Call the SignData method and store the signature byte[] signature = signer.SignData(data, new SHA1CryptoServiceProvider()); // Verifying Step 1: Create the digital signature algorithm object RSACryptoServiceProvider verifier = new RSACryptoServiceProvider(); // Verifying Step 4: Call the VerifyData method if (verifier.VerifyData(data2, new SHA1CryptoServiceProvider(), signature))
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Although this simplified example creates and verifies a signature within a single application, you will typically transfer the public key and digital signature across a network. The most convenient way to transfer digital signatures is to create a binary file that contains the public key, the digital signature, and the file data itself. However, you can also transmit them as separate files or separate network communications.
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Lab: Encrypting and Decrypting Files
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In this lab, you will write console applications that encrypt and decrypt files using a password. The console applications should take three parameters: the file name of the unencrypted file to read, the file name of the encrypted file to write, and the password. If you encounter a problem completing an exercise, the completed projects are available on the companion CD in the Code folder.
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Exercise 1: Write a Console Application to Encrypt Files
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In this exercise, you create a console application that encrypts files using a password. 1. Create a new console application in either Visual Basic or C#. 2. Add the System.Security.Cryptography and System.IO namespaces to your project. 3. Add code to read the command-line parameters into strings. If you are using Visual Basic, you will have to change the Main parameter declaration to accept an array of strings for example, Sub Main(ByVal args As String()) . The following code would work, though you should add error handling that displays usage information if the user does not provide the correct parameters:
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' VB Dim inFileName As String = args(0) Dim outFileName As String = args(1) Dim password As String = args(2) // C# string inFileName = args[0]; string outFileName = args[1]; string password = args[2];
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Lesson 3: Encrypting and Decrypting Data
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4. Write code to create the encryption object and specify the key and IV based on the provided password. The following code would work:
' VB ' Create the password key Dim saltValueBytes As Byte() = _ System.Text.Encoding.ASCII.GetBytes("This is my sa1t") Dim passwordKey As Rfc2898DeriveBytes = _ New Rfc2898DeriveBytes(password, saltValueBytes) ' Create the algorithm and specify the key and IV Dim alg As RijndaelManaged = New RijndaelManaged alg.Key = passwordKey.GetBytes(alg.KeySize / 8) alg.IV = passwordKey.GetBytes(alg.BlockSize / 8) // C# // Create the password key byte[] saltValueBytes = Encoding.ASCII.GetBytes("This is my sa1t"); Rfc2898DeriveBytes passwordKey = new Rfc2898DeriveBytes(password, saltValueBytes); // Create the algorithm and specify the key and IV RijndaelManaged alg = new RijndaelManaged(); alg.Key = passwordKey.GetBytes(alg.KeySize/8); alg.IV = passwordKey.GetBytes(alg.BlockSize/8);
5. Read the unencrypted file into a byte array, as the following code demonstrates:
' VB ' Read the unencrypted file into fileData Dim inFile As FileStream = New FileStream(inFileName, _ FileMode.Open, FileAccess.Read) Dim fileData(inFile.Length) As Byte inFile.Read(fileData, 0, CType(inFile.Length, Integer)) // C# // Read the unencrypted file into fileData FileStream inFile = new FileStream(inFileName, FileMode.Open, FileAccess.Read); byte[] fileData = new byte[inFile.Length]; inFile.Read(fileData, 0, (int)inFile.Length);
6. Create the ICryptoTransform object based on your cryptography algorithm. Then create a FileStream object to write the encrypted file. Create a CryptoStream object based on the ICryptoTransform object and the FileStream object, and then write the contents of the unencrypted file to the CryptoStream.
' VB ' Create the ICryptoTransform and CryptoStream object Dim encryptor As ICryptoTransform = alg.CreateEncryptor Dim outFile As FileStream = New FileStream(outFileName, FileMode.OpenOrCreate, FileAccess.Write)
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Dim encryptStream As CryptoStream = _ New CryptoStream(outFile, encryptor, CryptoStreamMode.Write) ' Write the contents to the CryptoStream encryptStream.Write(fileData, 0, fileData.Length) // C# // Create the ICryptoTransform and CryptoStream object ICryptoTransform encryptor = alg.CreateEncryptor(); FileStream outFile = new FileStream(outFileName, FileMode.OpenOrCreate, FileAccess.Write); CryptoStream encryptStream = new CryptoStream(outFile, encryptor, CryptoStreamMode.Write); // Write the contents to the CryptoStream encryptStream.Write(fileData, 0, fileData.Length);
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