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分享一段前段时间看到的AES可逆加密算法。
除去常见的MD5等加密方式，如果想要使用一些更加隐蔽的加密方式，则可以使用AES的RijndaelManaged加密算法。
关于加密，有很多复杂的算法，今天只跟大家分享一段摘取的结合动态密钥的对称AES RijndaelManaged加密解密算法，如果大家有兴趣了解更多，我们可以一起深入研究……
static void Main(string[] args)
{
string key = "8H[=}dKw+@3uV4D(";
CryptoHelper helper = new CryptoHelper(key);
if (args.Length == 2 && args[0] == "-e")
{
Console.WriteLine("Encrypt password: {0}", args[1]);
string a = helper.Encrypt(args[1]);
Console.WriteLine("Encrypt result is: {0}",a);
}
else if (args.Length == 2 && args[0] == "-d")
{
Console.WriteLine("Decrypt password: {0}", args[1]);
string a = helper.Decrypt(args[1]);
Console.WriteLine("Decrypt result is: {0}", a);
}
}
public class CryptoHelper
{
private const string _DefaultIntializationVector = "%1Az=-@qTx7h)5:-";
private RijndaelManaged _crypto;
private static Encoding _encoding = Encoding.ASCII;
private CryptoHelper()
{
}
/// <summary>
/// RijndaelManaged (AES)
/// </summary>
/// <param name="key">the key for encrypt</param>
public CryptoHelper(string key)
{
this._crypto = new RijndaelManaged();
this._crypto.Key = CryptoHelper._encoding.GetBytes(key);
this._crypto.IV = CryptoHelper._encoding.GetBytes("%1Az=-@qTx7h)5:-");
}
/// <summary>
/// encrypt the string
/// </summary>
/// <param name="s">encrypt string</param>
/// <returns>encrypt result</returns>
public string Encrypt(string s)
{
byte[] bytes = CryptoHelper._encoding.GetBytes(s);
MemoryStream memoryStream = new MemoryStream();
CryptoStream cryptoStream = new CryptoStream(memoryStream, this._crypto.CreateEncryptor(), CryptoStreamMode.Write);
cryptoStream.Write(bytes, 0, bytes.Length);
cryptoStream.Close();
memoryStream.Close();
byte[] array = memoryStream.ToArray();
if (array == null || array.Length == 0)
{
return "";
}
StringBuilder stringBuilder = new StringBuilder();
byte[] array2 = array;
for (int i = 0; i < array2.Length; i++)
{
byte b = array2[i];
stringBuilder.Append(string.Format("{0:X2}", b));
}
return stringBuilder.ToString();
}
/// <summary>
/// decrypt string
/// </summary>
/// <param name="hexValue"></param>
/// <returns></returns>
public string Decrypt(string hexValue)
{
byte[] array;
if (hexValue == null || hexValue.Length == 0)
{
array = null;
}
else
{
int num = Convert.ToInt32(hexValue.Length / 2);
array = new byte[num];
for (int i = 0; i <= num - 1; i++)
{
array[i] = Convert.ToByte(hexValue.Substring(i * 2, 2), 16);
}
}
MemoryStream stream = new MemoryStream(array, 0, array.Length);
byte[] array2 = new byte[array.Length - 1];
CryptoStream cryptoStream = new CryptoStream(stream, this._crypto.CreateDecryptor(), CryptoStreamMode.Read);
try
{
cryptoStream.Read(array2, 0, array.Length - 1);
}
catch (CryptographicException inner)
{
throw new CryptographicException("Unable to decrypt data. The provided key may be invalid.", inner);
}
finally
{
cryptoStream.Close();
}
int num2 = Array.IndexOf<byte>(array2, 0);
if (num2 >= 0)
{
return CryptoHelper._encoding.GetString(array2, 0, num2);
}
return CryptoHelper._encoding.GetString(array2);
}
}
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原文地址：http://www.cnblogs.com/cocoan/p/4415209.html
