Encrypted Data Exchange with .NET

Here is a simple example of AES in C#/ColdFusion:

ColdFusion code:

<cfset thePlainData = "Nothing to see here folks" />

<cfset theKey = "oRJUjgbx9SGGR6v3T8JGJg==" />

<cfset theAlgorithm = "AES/CBC/PKCS5Padding" />

<cfset theIVInBase64 = "f+hYUyjprHt/6FhTKOmsew==" />

<cfset theEncoding = "base64" />

<!--- do encrypt/decrypt --->

<!--- iv must be a byte array --->

<cfset theIV = BinaryDecode(theIVInBase64, "base64") />

<cfset encryptedString = encrypt(thePlainData, theKey, theAlgorithm, theEncoding, theIV) />

<cfset decryptedString = decrypt(encryptedString, theKey, theAlgorithm, theEncoding, theIV) />

<!--- display results --->

<cfdump var="#variables#" label="AES/CBC/PKCS5Padding Results" />

C# code:

using System;

using System.Collections.Generic;

using System.Text;

using System.Security.Cryptography;

public class AESCBC

{

    public static void Main(string[] args)

    {

        try

        {

            // Just hard coded values for testing ...

            String thePlainData = "Nothing to see here folks";

            String theKey = "oRJUjgbx9SGGR6v3T8JGJg==";

            String theIV = "f+hYUyjprHt/6FhTKOmsew==";

            String encryptedText = EncryptText(thePlainData, theKey, theIV);

            String decryptedText = DecryptText(encryptedText, theKey, theIV);

            Console.WriteLine("Encrypted String: {0}", encryptedText);

            Console.WriteLine("Decrypted String: {0}", decryptedText);

        }

        catch (Exception e)

        {

            Console.WriteLine(e.Message);

        }

        Console.ReadLine();

    }

    public static String EncryptText(String Data, String Key, String IV)

    {

        // Extract the bytes of each of the values

        byte[] input = Encoding.UTF8.GetBytes(Data);

        byte[] key = Convert.FromBase64String(Key);

        byte[] iv = Convert.FromBase64String(IV);

        // Create a new instance of the algorithm with the desired settings

        RijndaelManaged algorithm = new RijndaelManaged();

        algorithm.Mode = CipherMode.CBC;

        algorithm.Padding = PaddingMode.PKCS7;

        algorithm.BlockSize = 128;

        algorithm.KeySize = 128;

        algorithm.Key = key;

        algorithm.IV = iv;

        // Create a new encryptor and encrypt the given value

        ICryptoTransform cipher = algorithm.CreateEncryptor();

        byte[] output = cipher.TransformFinalBlock(input, 0, input.Length);

        // Finally, return the encrypted value in base64 format

        String encrypted = Convert.ToBase64String(output);

        return encrypted;

    }

    public static String DecryptText(String Data, String Key, String IV)

    {

        // Extract the bytes of each of the values

        byte[] input = Convert.FromBase64String(Data);

        byte[] key = Convert.FromBase64String(Key);

        byte[] iv = Convert.FromBase64String(IV);

        // Create a new instance of the algorithm with the desired settings

        RijndaelManaged algorithm = new RijndaelManaged();

        algorithm.Mode = CipherMode.CBC;

        algorithm.Padding = PaddingMode.PKCS7;

        algorithm.BlockSize = 128;

        algorithm.KeySize = 128;

        algorithm.Key = key;

        algorithm.IV = iv;

        //FromBase64String

        // Create a new encryptor and encrypt the given value

        ICryptoTransform cipher = algorithm.CreateDecryptor();

        byte[] output = cipher.TransformFinalBlock(input, 0, input.Length);

        // Finally, convert the decrypted value to UTF8 format

        String decrypted = Encoding.UTF8.GetString(output);

        return decrypted;

    }

}