Encryption/Decryption Function in .NET using the TripleDESCryptoServiceProvider Class

I would like to share some simple functions which can encrypt and decrypt strings. These functions can be used in any of .NET Framework supporting languages.

Just declare a pass phrase in your code like a master key which allows the MD5CryptoServiceProvider class (in the System.Security and System.Security.Cryptography namespace) to compute a hash value for encryption/decryption. TripleDESCryptoServiceProvider class is used to encrypt/ decrypt strings which in turn uses 3DES (Triple Data Encryption Standard) algorithm. 3DES alogorithm uses three 64-bit long keys to (Encrypt-Decrypt-Encrypt) data.

Declare the pass phrase as below, and you can set any string value you like:

const string passphrase = "password";

For example, "password" is the key I used here.

Now, you just have to use the Encrypt/Decrypt functions below in your class to encrypt and decrypt any string.

Below are the functions:

public static string EncryptData(string Message)
{
    byte[] Results;
    System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
    MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
    byte[] TDESKey = HashProvider.ComputeHash(UTF8.GetBytes(passphrase));
    TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider();
    TDESAlgorithm.Key = TDESKey;
    TDESAlgorithm.Mode = CipherMode.ECB;
    TDESAlgorithm.Padding = PaddingMode.PKCS7;
    byte[] DataToEncrypt = UTF8.GetBytes(Message);
    try
    {
        ICryptoTransform Encryptor = TDESAlgorithm.CreateEncryptor();
        Results = Encryptor.TransformFinalBlock(DataToEncrypt, 0, DataToEncrypt.Length);
    }
    finally
    {                
        TDESAlgorithm.Clear();
        HashProvider.Clear();
    }
    return Convert.ToBase64String(Results);
}

public static string DecryptString(string Message)
{
    byte[] Results;
    System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
    MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
    byte[] TDESKey = HashProvider.ComputeHash(UTF8.GetBytes(passphrase));
    TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider();
    TDESAlgorithm.Key = TDESKey;
    TDESAlgorithm.Mode = CipherMode.ECB;
    TDESAlgorithm.Padding = PaddingMode.PKCS7;
    byte[] DataToDecrypt = Convert.FromBase64String(Message);
    try
    {
        ICryptoTransform Decryptor = TDESAlgorithm.CreateDecryptor();
        Results = Decryptor.TransformFinalBlock(DataToDecrypt, 0, DataToDecrypt.Length);
    }
    finally
    {
        TDESAlgorithm.Clear();
        HashProvider.Clear();
    }
    return UTF8.GetString(Results);
}

Hope this helps someone save time while coding.

Happy coding!!!