C#使用DES和AES实现加密解密功能示例

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：

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);
    }
  }
}

ps：关于加密解密感兴趣的朋友还可以参考本站在线工具：

文字在线加密解密工具（包含aes、des、rc4等）：

md5在线加密工具:
http://tools.jb51.net/password/createmd5password

在线散列/哈希算法加密工具:

在线md5/hash/sha-1/sha-2/sha-256/sha-512/sha-3/ripemd-160加密工具：

在线sha1/sha224/sha256/sha384/sha512加密工具：

更多关于c#相关内容还可查看本站专题：《c#加密与解密算法与技巧总结》、《c#窗体操作技巧汇总》、《c#常见控件用法教程》、《winform控件用法总结》、《c#数据结构与算法教程》、《c#数组操作技巧总结》及《c#面向对象程序设计入门教程》

希望本文所述对大家c#程序设计有所帮助。