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How to Generate and Verify a Digital Signature for a File
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To generate a digital signature for a file, perform the following steps in your code: 1. Create the digital signature algorithm object. 2. Store the data to be signed in a byte array. 3. Call the SignData method and store the signature. 4. Export the public key. To verify the digital signature, perform the following steps: 1. Create the digital signature algorithm object. 2. Import the signature and public key. 3. Store the data to be verified in a byte array. 4. Call the VerifyData method. The following code sample is the Main method of a console application that accepts a file name as a command-line argument and displays a Base64-encoded digital signature for the file based on a dynamically generated key pair. The public key and digital signature are stored in variables. Then the application verifies the signature with the public key by creating new objects.
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' VB Sub Main(ByVal args As String()) ' Signing Step 1: Create the digital signature algorithm object Dim signer As DSACryptoServiceProvider = New DSACryptoServiceProvider ' Signing Step 2: Store the data to be signed in a byte array. Dim file As FileStream = _ New FileStream(args(0), FileMode.Open, FileAccess.Read) Dim reader As BinaryReader = New BinaryReader(file) Dim data As Byte() = reader.ReadBytes(CType(file.Length, Integer)) ' Signing Step 3: Call the SignData method and store the signature Dim signature As Byte() = signer.SignData(data) ' Signing Step 4: Export the public key Dim publicKey As String = signer.ToXmlString(False) Console.WriteLine("Signature: " + Convert.ToBase64String(signature)) reader.Close() file.Close() ' Verifying Step 1: Create the digital signature algorithm object Dim verifier As DSACryptoServiceProvider = New DSACryptoServiceProvider ' Verifying Step 2: Import the signature and public key. verifier.FromXmlString(publicKey) ' Verifying Step 3: Store the data to be verified in a byte array Dim file2 As FileStream = _ New FileStream(args(0), FileMode.Open, FileAccess.Read) Dim reader2 As BinaryReader = New BinaryReader(file2) Dim data2 As Byte() = reader2.ReadBytes(CType(file2.Length, Integer)) ' Verifying Step 4: Call the VerifyData method If verifier.VerifyData(data2, signature) Then Console.WriteLine("Signature verified") Else Console.WriteLine("Signature NOT verified") End If reader2.Close() file2.Close() End Sub // C# // Signing Step 1: Create the digital signature algorithm object DSACryptoServiceProvider signer = new DSACryptoServiceProvider(); // Signing Step 2: Store the data to be signed in a byte array. FileStream file = new FileStream(args[0], FileMode.Open, FileAccess.Read); BinaryReader reader = new BinaryReader(file); byte[] data = reader.ReadBytes((int)file.Length); // Signing Step 3: Call the SignData method and store the signature byte[] signature = signer.SignData(data);
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// Signing Step 4: Export the public key string publicKey = signer.ToXmlString(false); Console.WriteLine("Signature: " + Convert.ToBase64String(signature)); reader.Close(); file.Close(); // Verifying Step 1: Create the digital signature algorithm object DSACryptoServiceProvider verifier = new DSACryptoServiceProvider(); // Verifying Step 2: Import the signature and public key. verifier.FromXmlString(publicKey); // Verifying Step 3: Store the data to be verified in a byte array FileStream file2 = new FileStream(args[0], FileMode.Open, FileAccess.Read); BinaryReader reader2 = new BinaryReader(file2); byte[] data2 = reader2.ReadBytes((int)file2.Length); // Verifying Step 4: Call the VerifyData method if (verifier.VerifyData(data2, signature)) Console.WriteLine("Signature verified"); else Console.WriteLine("Signature NOT verified"); reader2.Close(); file2.Close();
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The previous example uses the DSACryptoServiceProvider class, but you can also use RSACryptoServiceProvider for digital signatures. RSACryptoServiceProvider usage is similar, but requires providing a hash algorithm object for both the SignData and VerifyData methods. The following code sample shows only the lines that would need to change from the previous example to use RSACryptoServiceProvider with the SHA1CryptoServiceProvider hash algorithm:
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' VB ' Signing Step 1: Create the digital signature algorithm object Dim signer As RSACryptoServiceProvider = New RSACryptoServiceProvider ' Signing Step 3: Call the SignData method and store the signature Dim signature As Byte() = _ signer.SignData(data, New SHA1CryptoServiceProvider) ' Verifying Step 1: Create the digital signature algorithm object Dim verifier As RSACryptoServiceProvider = New RSACryptoServiceProvider ' Verifying Step 4: Call the VerifyData method If verifier.VerifyData(data2, New SHA1CryptoServiceProvider, signature) Then // C# // Signing Step 1: Create the digital signature algorithm object RSACryptoServiceProvider signer = new RSACryptoServiceProvider();
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