ASP.NET----编解码的静态类实现数据的加密

using System.Security.Cryptography;
using System.IO;
using System;
using System.Text;

namespace Core.Common.Tool
{
/// <summary>
/// 用于编解码的静态类
/// </summary>
public static class Code
{
#region 变量定义

/// <summary>
/// 对称算法基类
/// </summary>
private static SymmetricAlgorithm mobjCryptoService;
/// <summary>
/// 编码字符串
/// </summary>
private static string Key;

#endregion

#region 构造函数

/// <summary>
/// 对称加密类的构造函数
/// </summary>
static Code()
{
mobjCryptoService = new RijndaelManaged();
Key = "Guz(%&hj7x89H$yuCORE56FtmaT8&fvHCFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";
}

#endregion

#region 方法

#region 对称加密

/// <summary>
/// 获得密钥
/// </summary>
/// <returns>密钥</returns>
private static byte[] GetLegalKey()
{
string sTemp = Key;
mobjCryptoService.GenerateKey();
byte[] bytTemp = mobjCryptoService.Key;
int KeyLength = bytTemp.Length;
if (sTemp.Length > KeyLength)
sTemp = sTemp.Substring(0, KeyLength);
else if (sTemp.Length < KeyLength)
sTemp = sTemp.PadRight(KeyLength, ' ');
return ASCIIEncoding.ASCII.GetBytes(sTemp);
}

/// <summary>
/// 获得初始向量IV
/// </summary>
/// <returns>初试向量IV</returns>
private static byte[] GetLegalIV()
{
string sTemp = "E4ghj*Ghg7!rNIfb&95CORE6GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";
mobjCryptoService.GenerateIV();
byte[] bytTemp = mobjCryptoService.IV;
int IVLength = bytTemp.Length;
if (sTemp.Length > IVLength)
sTemp = sTemp.Substring(0, IVLength);
else if (sTemp.Length < IVLength)
sTemp = sTemp.PadRight(IVLength, ' ');
return ASCIIEncoding.ASCII.GetBytes(sTemp);
}

/// <summary>
/// 加密方法
/// </summary>
/// <param name="Source">待加密的串</param>
/// <returns>经过加密的串</returns>
public static string EncryptCode(string Source)
{
byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
MemoryStream ms = new MemoryStream();
mobjCryptoService.Key = GetLegalKey();
mobjCryptoService.IV = GetLegalIV();
ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
cs.Write(bytIn, 0, bytIn.Length);
cs.FlushFinalBlock();
ms.Close();
byte[] bytOut = ms.ToArray();
return Convert.ToBase64String(bytOut);
}

/// <summary>
/// 解密方法
/// </summary>
/// <param name="Source">待解密的串</param>
/// <returns>经过解密的串</returns>
public static string DecryptCode(string Source)
{
byte[] bytIn = Convert.FromBase64String(Source);
MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
mobjCryptoService.Key = GetLegalKey();
mobjCryptoService.IV = GetLegalIV();
ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cs);
return sr.ReadToEnd();
}

#endregion

#region 简单字符串加密

/// <summary>
/// 倒序加1加密
/// </summary>
/// <param name="rs">明文</param>
/// <returns>密文</returns>
public static string EncryptStringSimple(string rs)
{
byte[] by = new byte[rs.Length];
for (int i = 0; i < rs.Length; i++)
{
by[i] = (byte)((byte)rs[i] + 1);
}
rs = "";
for (int i = by.Length - 1; i >= 0; i--)
{
rs += ((char)by[i]).ToString();
}
return rs;
}

/// <summary>
/// 顺序减1解码
/// </summary>
/// <param name="rs">密文</param>
/// <returns>明文</returns>
public static string DecryptStringSimple(string rs)
{
byte[] by = new byte[rs.Length];
for (int i = 0; i <= rs.Length - 1; i++)
{
by[i] = (byte)((byte)rs[i] - 1);
}
rs = "";
for (int i = by.Length - 1; i >= 0; i--)
{
rs += ((char)by[i]).ToString();
}
return rs;
}

#endregion

#endregion
}
}