求一个字符串加密解密的类

Question

要C#的，简单实用就好，不要太复杂

Answer 1

http://rss.5blogs.com/blog/2006813173851163.2897132323.htm

Answer 2

using System;
using System.Security.Cryptography;
using System.Text;namespace BEGroup
{
/// <summary>
/// 对字符串的加密与解密。
/// 该类无法实例化
/// </summary>
public static class Crypto
{
private static RijndaelManaged GetRM()
{
RijndaelManaged rm = new RijndaelManaged();
rm.Key = new byte[0x20] 
{ 
0x81, 0xce, 0xd9, 0x27, 0xfe, 0x48, 0xae, 0xce, 0x6a, 0xfa, 0x4f, 0x39, 0x77, 0xd7, 0x2e, 0x89, 
0x4f, 12, 0x13, 0x5f, 0x95, 0x79, 0x35, 190, 0x94, 0xf7, 0xdd, 0x79, 0x94, 0xa9, 0xa1, 0x60
};
rm.IV = new byte[0x10] { 200, 0x1c, 70, 0x74, 0xd8, 0x92, 3, 1, 0xcb, 0xfd, 0x16, 0xd8, 100, 0x51, 0xc5, 0x97}; return rm;
} /// <summary>
/// 加密字符串
/// </summary>
/// <param name="data">要加密的字符串</param>
/// <returns>加密后的字符串</returns>
public static string Encrypt(string data)
{
RijndaelManaged rm = GetRM(); try
{
byte[] bData = Encoding.UTF8.GetBytes(data);
byte[] bEncrypt = rm.CreateEncryptor().TransformFinalBlock(bData, 0, bData.Length);
return Convert.ToBase64String(bEncrypt);
}
catch
{
return null;
}
} /// <summary>
/// 解密字符串
/// </summary>
/// <param name="data">要解密的字符串</param>
/// <returns>解密后的字符串</returns>
public static string Decrypt(string data)
{
RijndaelManaged rm = GetRM(); try
{
byte[] bData = Convert.FromBase64String(data);
byte[] bDecrypt = rm.CreateDecryptor().TransformFinalBlock(bData, 0, bData.Length);
return Encoding.UTF8.GetString(bDecrypt);
}
catch
{
return null;
}
}
}
}