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标题: .net实现md5加密 sha1加密 sha256加密 sha384加密 sha512加密 des加密解密 [打印本页]

作者: admin 时间: 2016-10-30 10:14
标题: .net实现md5加密 sha1加密 sha256加密 sha384加密 sha512加密 des加密解密
using System.Security;
using System.Security.Cryptography;
using System.Web;
using System.IO;

      //ＭＤ5　　　　　　　不区分大小写的
      //type 类型，16位还是32位，16位就是取32位的第8到16位
      public string DoMd5Encode(string pwd,string type)
      {
         byte[] result = Encoding.Default.GetBytes(pwd);
         MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
         byte[] output = md5.ComputeHash(result);
         if (type == "16")
               return BitConverter.ToString(output).Replace("-", "").ToLower().Substring(8,16);
         else
               return BitConverter.ToString(output).Replace("-", "").ToLower();

      }

      /// <summary>
      /// 对字符串进行SHA1加密
      /// </summary>
      /// <param name="strIN">需要加密的字符串</param>
      /// <returns>密文</returns>
      public string SHA1_Encrypt(string Source_String)
      {
         byte[] StrRes = Encoding.Default.GetBytes(Source_String);
         HashAlgorithm iSHA = new SHA1CryptoServiceProvider();
         StrRes = iSHA.ComputeHash(StrRes);
         StringBuilder EnText = new StringBuilder();
         foreach (byte iByte in StrRes)
         {
               EnText.AppendFormat("{0:x2}", iByte);
         }
         return EnText.ToString();
      }

      /// <summary>
      /// SHA256加密，不可逆转
      /// </summary>
      /// <param name="str">string str:被加密的字符串</param>
      /// <returns>返回加密后的字符串</returns>
      private string SHA256Encrypt(string str)
      {
         System.Security.Cryptography.SHA256 s256 = new System.Security.Cryptography.SHA256Managed();
         byte[] byte1;
         byte1 = s256.ComputeHash(Encoding.Default.GetBytes(str));
         s256.Clear();
         return Convert.ToBase64String(byte1);
      }

   /// <summary>
      /// SHA384加密，不可逆转
      /// </summary>
      /// <param name="str">string str:被加密的字符串</param>
      /// <returns>返回加密后的字符串</returns>
      private string SHA384Encrypt(string str)
      {
         System.Security.Cryptography.SHA384 s384 = new System.Security.Cryptography.SHA384Managed();
         byte[] byte1;
         byte1 = s384.ComputeHash(Encoding.Default.GetBytes(str));
         s384.Clear();
         return Convert.ToBase64String(byte1);
      }

      /// <summary>
      /// SHA512加密，不可逆转
      /// </summary>
      /// <param name="str">string str:被加密的字符串</param>
      /// <returns>返回加密后的字符串</returns>
      private string SHA512Encrypt(string str)
      {
         System.Security.Cryptography.SHA512 s512 = new System.Security.Cryptography.SHA512Managed();
         byte[] byte1;
         byte1 = s512.ComputeHash(Encoding.Default.GetBytes(str));
         s512.Clear();
         return Convert.ToBase64String(byte1);
      }

      //默认密钥向量
      private byte[] Keys = { 0xEF, 0xAB, 0x56, 0x78, 0x90, 0x34, 0xCD, 0x12 };
      /// <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 string EncryptDES(string encryptString, string encryptKey)
      {
         try
         {
               byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
               byte[] rgbIV = Keys;
               byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
               DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
               MemoryStream mStream = new MemoryStream();
               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 string DecryptDES(string decryptString, string decryptKey)
      {
         try
         {
               byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey.Substring(0, 8));
               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;
         }
      }

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