C#字符串使用密钥进行加解密

C#字符串加密和解密

using System.Security.Cryptography;
using System.IO;
//默认密钥向量
    private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

    /// <summary>
    /// DES加密字符串
    /// </summary>
    /// <param name="encryptString">待加密的字符串</param>
    /// <param name="encryptKey">加密密钥,要求为8位</param>
    /// <returns>加密成功返回加密后的字符串，失败返回源串 </returns>
    public static string EncryptDES(string encryptString, string encryptKey)
    {
      try
      {
        byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));//转换为字节
        byte[] rgbIV = Keys;
        byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
        DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();//实例化数据加密标准
        MemoryStream mStream = new MemoryStream();//实例化内存流
        //将数据流链接到加密转换的流
        CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
        cStream.Write(inputByteArray, 0, inputByteArray.Length);
        cStream.FlushFinalBlock();
        return Convert.ToBase64String(mStream.ToArray());
      }
      catch
      {
        return encryptString;
      }
    }

    /// <summary>
    /// DES解密字符串
    /// </summary>
    /// <param name="decryptString">待解密的字符串</param>
    /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
    /// <returns>解密成功返回解密后的字符串，失败返源串</returns>
    public static string DecryptDES(string decryptString, string decryptKey)
    {
      try
      {
        byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
        byte[] rgbIV = Keys;
        byte[] inputByteArray = Convert.FromBase64String(decryptString);
        DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
        MemoryStream mStream = new MemoryStream();
        CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
        cStream.Write(inputByteArray, 0, inputByteArray.Length);
        cStream.FlushFinalBlock();
        return Encoding.UTF8.GetString(mStream.ToArray());
      }
      catch
      {
        return decryptString;
      }
    }



      string EncryptStr = EncryptDESString.EncryptDES("aaaaaaaaaa", "ssssssss"); //返回加密后的字符串
      string DecryptStr = EncryptDESString.DecryptDES(EncryptStr, "ssssssss");//解密字符串