在.NET中使用秘密加密/混淆字节数组的简单方法？

Question

我正在寻找一种使用.NET 3.5加密/混淆(当然还有解密/反混淆)字节数组的方法.

基本上:

byte[] aMixedUp = Encrypt(aMyByteData, "THIS IS THE SECRET KEY USED TO ENCRYPT");

在另一边:

byte[] aDecrypted = Decrypt(aMixedUp, "THIS IS THE SECRET KEY USED TO ENCRYPT");

它不一定是防弹.这个想法只是为了防止用户直接查看字节中的内容,以防它们映射到ASCII,但它应该比ROT13更好.

我可以轻松使用.NET库中的某些东西吗？

Answer 1

这是我写的一些加密/解密字符串的代码.加密的字符串是Base64编码的,以便于序列化为XML等.您可以轻松地将此代码转换为直接使用字节数组而不是字符串.

/// <summary>
/// Create and initialize a crypto algorithm.
/// </summary>
/// <param name="password">The password.</param>
private static SymmetricAlgorithm GetAlgorithm(string password)
{
    var algorithm = Rijndael.Create();
    var rdb = new Rfc2898DeriveBytes(password, new byte[] {
        0x53,0x6f,0x64,0x69,0x75,0x6d,0x20,             // salty goodness
        0x43,0x68,0x6c,0x6f,0x72,0x69,0x64,0x65
    });
    algorithm.Padding = PaddingMode.ISO10126;
    algorithm.Key = rdb.GetBytes(32);
    algorithm.IV = rdb.GetBytes(16);
    return algorithm;
}


/// <summary>
/// Encrypts a string with a given password.
/// </summary>
/// <param name="clearText">The clear text.</param>
/// <param name="password">The password.</param>
public static string EncryptString(string clearText, string password)
{
    var algorithm = GetAlgorithm(password);
    var encryptor = algorithm.CreateEncryptor();
    var clearBytes = Encoding.Unicode.GetBytes(clearText);
    using (var ms = new MemoryStream())
    using (var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write))
    {
        cs.Write(clearBytes, 0, clearBytes.Length);
        cs.Close();
        return Convert.ToBase64String(ms.ToArray());
    }
}

/// <summary>
/// Decrypts a string using a given password.
/// </summary>
/// <param name="cipherText">The cipher text.</param>
/// <param name="password">The password.</param>
public static string DecryptString(string cipherText, string password)
{
    var algorithm = GetAlgorithm(password);
    var decryptor = algorithm.CreateDecryptor();
    var cipherBytes = Convert.FromBase64String(cipherText);
    using (var ms = new MemoryStream())
    using (var cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Write))
    {
        cs.Write(cipherBytes, 0, cipherBytes.Length);
        cs.Close();
        return Encoding.Unicode.GetString(ms.ToArray());
    }
}