SymmetricCryptoStream Class

The SymmetricCryptoStream class is used within the .NET Framework to encrypt and decrypt data and is included as part of PowerTCP SSL Sockets for .NET. It provides private-key encryption functionality for any .NET application. Other features include:

• Simplifies the .NET encryption implementation. Encrypt and decrypt data with only a few lines of code.
• Initialize the SymmetricCryptoStream using a System.IO.MemoryStream for memory-based encryption/decryption (encrypting data in memory).
• Initialize the SymmetricCryptoStream using a System.IO.FileStream for file-based encryption (encrypting data and writing it to a file, reading the data back and decrypting it).
• Includes an ASP.NET sample which demonstrates encrypting and decrypting in memory
• Includes a royalty-free license!

Code Example

How easy is the SymmetricCryptoStream to use? The following example demonstrates simple encryption.

VB.NET Example
' Create a key and some data.
Dim key As Byte() = System.Text.Encoding.Default.GetBytes("test key")
Dim data As Byte() = System.Text.Encoding.Default.GetBytes("This is the plain text data")

' Create a FileStream to hold the data
Dim f As System.IO.FileStream = New System.IO.FileStream("C:\encrypted", System.IO.FileMode.Create)
Dim sc As New Dart.PowerTCP.Sockets.SymmetricCryptoStream(key, f)

' Write to the file. This encrypts the data.
sc.Write(data, 0, data.Length)
sc.Position = 0
f.Close()

' Now read the data from the encrypted file to decrypt
f = new System.IO.FileStream("C:\encrypted", System.IO.FileMode.Open)
sc = new Dart.PowerTCP.Sockets.SymmetricCryptoStream(key, f)

data = new byte(sc.Length)
sc.Read(data, 0, data.Length)

sc.Position = 0
f.Close()

' Display results
Debug.WriteLine(System.Text.Encoding.Default.GetString(data))