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转载：http://www.cnblogs.com/kevin-top/archive/2010/07/01/1769351.html
using System;
using System.Text;
using System.Security.Cryptography;
using System.IO;
namespace MyCryptography
{
/// <summary>
/// DES加密解密
/// </summary>
public class DES
{
/// <summary>
/// 获取密钥
/// </summary>
private static string Key
{
get { return @"P@+#wG+Z"; }
}
/// <summary>
/// 获取向量
/// </summary>
private static string IV
{
get { return @"L%n67}G\Mk@k%:~Y"; }
}
/// <summary>
/// DES加密
/// </summary>
/// <param name="plainStr">明文字符串</param>
/// <returns>密文</returns>
public static string DESEncrypt(string plainStr)
{
byte[] bKey = Encoding.UTF8.GetBytes(Key);
byte[] bIV = Encoding.UTF8.GetBytes(IV);
byte[] byteArray = Encoding.UTF8.GetBytes(plainStr);
string encrypt = null;
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
try
{
using (MemoryStream mStream = new MemoryStream())
{
using (CryptoStream cStream = new CryptoStream(mStream, des.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write))
{
cStream.Write(byteArray, 0, byteArray.Length);
cStream.FlushFinalBlock();
encrypt = Convert.ToBase64String(mStream.ToArray());
}
}
}
catch { }
des.Clear();
return encrypt;
}
/// <summary>
/// DES解密
/// </summary>
/// <param name="encryptStr">密文字符串</param>
/// <returns>明文</returns>
public static string DESDecrypt(string encryptStr)
{
byte[] bKey = Encoding.UTF8.GetBytes(Key);
byte[] bIV = Encoding.UTF8.GetBytes(IV);
byte[] byteArray = Convert.FromBase64String(encryptStr);
string decrypt = null; DESCryptoServiceProvider des = new DESCryptoServiceProvider(); try { using (MemoryStream mStream = new MemoryStream()) { using (CryptoStream cStream = new CryptoStream(mStream, des.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write)) { cStream.Write(byteArray, 0, byteArray.Length); cStream.FlushFinalBlock(); decrypt = Encoding.UTF8.GetString(mStream.ToArray()); } } } catch { } des.Clear(); return decrypt; } } /// <summary> /// AES加密解密 /// </summary> public class AES { /// <summary> /// 获取密钥 /// </summary> private static string Key { get { return @")O[NB]6,YF}+efcaj{+oESb9d8>Z‘e9M"; } } /// <summary> /// 获取向量 /// </summary> private static string IV { get { return @"L+\~f4,Ir)b$=pkf"; } } /// <summary> /// AES加密 /// </summary> /// <param name="plainStr">明文字符串</param> /// <returns>密文</returns> public static string AESEncrypt(string plainStr) { byte[] bKey = Encoding.UTF8.GetBytes(Key); byte[] bIV = Encoding.UTF8.GetBytes(IV); byte[] byteArray = Encoding.UTF8.GetBytes(plainStr); string encrypt = null; Rijndael aes = Rijndael.Create(); try { using (MemoryStream mStream = new MemoryStream()) { using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateEncryptor(bKey, bIV), CryptoStreamMode.Write)) { cStream.Write(byteArray, 0, byteArray.Length); cStream.FlushFinalBlock(); encrypt = Convert.ToBase64String(mStream.ToArray()); } } } catch { } aes.Clear(); return encrypt; } /// <summary> /// AES加密 /// </summary> /// <param name="plainStr">明文字符串</param> /// <param name="returnNull">加密失败时是否返回 null，false 返回 String.Empty</param> /// <returns>密文</returns> public static string AESEncrypt(string plainStr, bool returnNull) { string encrypt = AESEncrypt(plainStr); return returnNull ? encrypt : (encrypt == null ? String.Empty : encrypt); } /// <summary> /// AES解密 /// </summary> /// <param name="encryptStr">密文字符串</param> /// <returns>明文</returns> public static string AESDecrypt(string encryptStr) { byte[] bKey = Encoding.UTF8.GetBytes(Key); byte[] bIV = Encoding.UTF8.GetBytes(IV); byte[] byteArray = Convert.FromBase64String(encryptStr); string decrypt = null; Rijndael aes = Rijndael.Create(); try { using (MemoryStream mStream = new MemoryStream()) { using (CryptoStream cStream = new CryptoStream(mStream, aes.CreateDecryptor(bKey, bIV), CryptoStreamMode.Write)) { cStream.Write(byteArray, 0, byteArray.Length); cStream.FlushFinalBlock(); decrypt = Encoding.UTF8.GetString(mStream.ToArray()); } } } catch { } aes.Clear(); return decrypt; } /// <summary> /// AES解密 /// </summary> /// <param name="encryptStr">密文字符串</param> /// <param name="returnNull">解密失败时是否返回 null，false 返回 String.Empty</param> /// <returns>明文</returns> public static string AESDecrypt(string encryptStr, bool returnNull) { string decrypt = AESDecrypt(encryptStr); return returnNull ? decrypt : (decrypt == null ? String.Empty : decrypt); } }}
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原文地址：http://www.cnblogs.com/SkyflyBird/p/4932699.html
