本文实例讲述了C#使用DES和AES实现加密解密功能。分享给大家供大家参考，具体如下：

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using System;
using System.Text;
using System.Security.Cryptography;
using System.IO;
namespace MyCryptography
{
  /// 

  /// DES加密解密
  /// 
  public class DES
  {
    /// 

    /// 获取密钥
    /// 
    private static string Key
    {
      get { return @"P@+#wG+Z"; }
    }
    /// 

    /// 获取向量
    /// 
    private static string IV
    {
      get { return @"L%n67}G\Mk@k%:~Y"; }
    }
    /// 

    /// DES加密
    /// 
    /// 明文字符串
    /// 密文
    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;
    }
    /// 

    /// DES解密
    /// 
    /// 密文字符串
    /// 明文
    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;
    }
  }
  /// 

  /// AES加密解密
  /// 
  public class AES
  {
    /// 

    /// 获取密钥
    /// 
    private static string Key
    {
      get { return @")O[NB]6,YF}+efcaj{+oESb9d8>Z'e9M"; }
    }
    /// 

    /// 获取向量
    /// 
    private static string IV
    {
      get { return @"L+\~f4,Ir)b$=pkf"; }
    }
    /// 

    /// AES加密
    /// 
    /// 明文字符串
    /// 密文
    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;
    }
    /// 

    /// AES加密
    /// 
    /// 明文字符串
    /// 加密失败时是否返回 null，false 返回 String.Empty
    /// 密文
    public static string AESEncrypt(string plainStr, bool returnNull)
    {
      string encrypt = AESEncrypt(plainStr);
      return returnNull ? encrypt : (encrypt == null ? String.Empty : encrypt);
    }
    /// 

    /// AES解密
    /// 
    /// 密文字符串
    /// 明文
    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;
    }
    /// 

    /// AES解密
    /// 
    /// 密文字符串
    /// 解密失败时是否返回 null，false 返回 String.Empty
    /// 明文
    public static string AESDecrypt(string encryptStr, bool returnNull)
    {
      string decrypt = AESDecrypt(encryptStr);
      return returnNull ? decrypt : (decrypt == null ? String.Empty : decrypt);
    }
  }
}

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