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| 07/14/2009 at 10:05AM PDT, ID: 24569487 |
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using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace RijndaelManaged_Examples
{
class RijndaelMemoryExample
{
public static void Main()
{
try
{
string original = "sid=S123456&name=Fred+Smith&usertype=BC&bucode=SW&expires=1246044953238";
// Create a new instance of the RijndaelManaged
// class. This generates a new key and initialization
// vector (IV).
RijndaelManaged myRijndael = new RijndaelManaged();
byte[] key = System.Text.Encoding.UTF8.GetBytes("933aeffebf46b9f5a54fee575d723283");
myRijndael.Key = key;
byte[] IV = System.Text.Encoding.UTF8.GetBytes("308b72a06f3770c86c2d0cafd67c54d4");
//myRijndael.BlockSize = 16;
myRijndael.IV = IV;
myRijndael.Mode = CipherMode.CBC;
myRijndael.Padding = PaddingMode.PKCS7;
// Encrypt the string to an array of bytes.
//byte[] encrypted = encryptStringToBytes_AES(original, myRijndael.Key, myRijndael.IV);
byte[] encrypted = System.Text.Encoding.UTF8.GetBytes("bcec60d0f3c71bef2207a4d08b65bf3ec7e100f7a564ec3c5c65fbbffbb2819162d738aae003c954956e6efe5760a75be68472b3f87b335a0f1e3f8d0626c45deca8f8b7b81a2b8993c2bbc5bd7acf2e");
// Convert utf-8 bytes to a string.
string s_unicode2 = System.Text.Encoding.UTF8.GetString(encrypted);
Console.WriteLine("Encrypted: {0}", s_unicode2);
// Decrypt the bytes to a string.
string roundtrip = decryptStringFromBytes_AES(encrypted, myRijndael.Key, myRijndael.IV);
//Display the original data and the decrypted data.
Console.WriteLine("Original: {0}", original);
Console.WriteLine("Round Trip: {0}", roundtrip);
Console.Read();
}
catch (Exception e)
{
Console.WriteLine("Error: {0}", e.Message);
Console.Read();
}
}
static byte[] encryptStringToBytes_AES(string plainText, byte[] Key, byte[] IV)
{
// Check arguments.
if (plainText == null || plainText.Length <= 0)
throw new ArgumentNullException("plainText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
// Declare the stream used to encrypt to an in memory
// array of bytes.
MemoryStream msEncrypt = null;
// Declare the RijndaelManaged object
// used to encrypt the data.
RijndaelManaged aesAlg = null;
try
{
// Create a RijndaelManaged object
// with the specified key and IV.
aesAlg = new RijndaelManaged();
aesAlg.BlockSize = 256;
aesAlg.Key = Key;
aesAlg.IV = IV;
aesAlg.Mode = CipherMode.CBC;
aesAlg.Padding = PaddingMode.PKCS7;
// Create a decrytor to perform the stream transform.
ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
// Create the streams used for encryption.
msEncrypt = new MemoryStream();
using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
{
using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
{
//Write all data to the stream.
swEncrypt.Write(plainText);
}
}
}
finally
{
// Clear the RijndaelManaged object.
if (aesAlg != null)
aesAlg.Clear();
}
// Return the encrypted bytes from the memory stream.
return msEncrypt.ToArray();
}
static string decryptStringFromBytes_AES(byte[] cipherText, byte[] Key, byte[] IV)
{
// Check arguments.
if (cipherText == null || cipherText.Length <= 0)
throw new ArgumentNullException("cipherText");
if (Key == null || Key.Length <= 0)
throw new ArgumentNullException("Key");
if (IV == null || IV.Length <= 0)
throw new ArgumentNullException("Key");
// Declare the RijndaelManaged object
// used to decrypt the data.
RijndaelManaged aesAlg = null;
// Declare the string used to hold
// the decrypted text.
string plaintext = null;
try
{
// Create a RijndaelManaged object
// with the specified key and IV.
aesAlg = new RijndaelManaged();
aesAlg.BlockSize = 256;
aesAlg.Key = Key;
aesAlg.IV = IV;
aesAlg.Mode = CipherMode.CBC;
aesAlg.Padding = PaddingMode.PKCS7;
// Create a decrytor to perform the stream transform.
ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
// Create the streams used for decryption.
using (MemoryStream msDecrypt = new MemoryStream(cipherText))
{
using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
{
using (StreamReader srDecrypt = new StreamReader(csDecrypt))
// Read the decrypted bytes from the decrypting stream
// and place them in a string.
plaintext = srDecrypt.ReadToEnd();
}
}
}
finally
{
// Clear the RijndaelManaged object.
if (aesAlg != null)
aesAlg.Clear();
}
return plaintext;
}
}
}
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