C# 常用字符串加密解密方法

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

using System.Text.RegularExpressions;

using System.Web.Security;

 

namespace HuaTong.General.Utility

{

     /// <summary>

     /// 加密工具类

     /// </summary>

     public  class EncryptHelper

     {

         //默认密钥

         private  static  string AESKey =  "[45/*YUIdse..e;]" ;

         private  static  string DESKey =  "[&HdN72]" ;

 

         /// <summary> 

         /// AES加密 

         /// </summary>

         public  static  string AESEncrypt(string value, string _aeskey =  null )

         {

             if (string.IsNullOrEmpty(_aeskey))

             {

                 _aeskey = AESKey;

             }

 

             byte[] keyArray = Encoding.UTF8.GetBytes(_aeskey);

             byte[] toEncryptArray = Encoding.UTF8.GetBytes(value);

 

             RijndaelManaged rDel = new RijndaelManaged();

             rDel. Key  = keyArray;

             rDel.Mode = CipherMode.ECB;

             rDel.Padding = PaddingMode.PKCS7;

 

             ICryptoTransform cTransform = rDel.CreateEncryptor();

             byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

 

             return  Convert .ToBase64String(resultArray, 0, resultArray.Length);

         }

 

         /// <summary> 

         /// AES解密 

         /// </summary>

         public  static  string AESDecrypt(string value, string _aeskey =  null )

         {

             try

             {

                 if (string.IsNullOrEmpty(_aeskey))

                 {

                     _aeskey = AESKey;

                 }

                 byte[] keyArray = Encoding.UTF8.GetBytes(_aeskey);

                 byte[] toEncryptArray =  Convert .FromBase64String(value);

 

                 RijndaelManaged rDel = new RijndaelManaged();

                 rDel. Key  = keyArray;

                 rDel.Mode = CipherMode.ECB;

                 rDel.Padding = PaddingMode.PKCS7;

 

                 ICryptoTransform cTransform = rDel.CreateDecryptor();

                 byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

 

                 return  Encoding.UTF8.GetString(resultArray);

             }

             catch

             {

                 return  string.Empty;

             }

         }

 

         /// <summary> 

         /// DES加密 

         /// </summary>

         public  static  string DESEncrypt(string value, string _deskey =  null )

         {

             if (string.IsNullOrEmpty(_deskey))

             {

                 _deskey = DESKey;

             }

 

             byte[] keyArray = Encoding.UTF8.GetBytes(_deskey);

             byte[] toEncryptArray = Encoding.UTF8.GetBytes(value);

 

             DESCryptoServiceProvider rDel = new DESCryptoServiceProvider();

             rDel. Key  = keyArray;

             rDel.Mode = CipherMode.ECB;

             rDel.Padding = PaddingMode.PKCS7;

 

             ICryptoTransform cTransform = rDel.CreateEncryptor();

             byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

 

             return  Convert .ToBase64String(resultArray, 0, resultArray.Length);

         }

 

         /// <summary> 

         /// DES解密 

         /// </summary>

         public  static  string DESDecrypt(string value, string _deskey =  null )

         {

             try

             {

                 if (string.IsNullOrEmpty(_deskey))

                 {

                     _deskey = DESKey;

                 }

                 byte[] keyArray = Encoding.UTF8.GetBytes(_deskey);

                 byte[] toEncryptArray =  Convert .FromBase64String(value);

 

                 DESCryptoServiceProvider rDel = new DESCryptoServiceProvider();

                 rDel. Key  = keyArray;

                 rDel.Mode = CipherMode.ECB;

                 rDel.Padding = PaddingMode.PKCS7;

 

                 ICryptoTransform cTransform = rDel.CreateDecryptor();

                 byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

 

                 return  Encoding.UTF8.GetString(resultArray);

             }

             catch

             {

                 return  string.Empty;

             }

         }

 

         public  static  string MD5(string value)

         {

             byte[] result = Encoding.UTF8.GetBytes(value);

             MD5 md5 = new MD5CryptoServiceProvider();

             byte[]  output  = md5.ComputeHash(result);

             return  BitConverter.ToString( output ). Replace ( "-" ,  "" );

         }

 

         public  static  string HMACMD5(string value, string hmacKey)

         {

             HMACSHA1 hmacsha1 = new HMACSHA1(Encoding.UTF8.GetBytes(hmacKey));

             byte[] result = System.Text.Encoding.UTF8.GetBytes(value);

             byte[]  output  = hmacsha1.ComputeHash(result);

 

             

             return  BitConverter.ToString( output ). Replace ( "-" ,  "" );

         }

 

         /// <summary>

         /// base64编码

         /// </summary>

         /// < returns ></ returns >

         public  static  string Base64Encode(string value)

         {

             string result =  Convert .ToBase64String(Encoding. Default .GetBytes(value));

             return  result;

         }

         /// <summary>

         /// base64解码

         /// </summary>

         /// < returns ></ returns >

         public  static  string Base64Decode(string value)

         {

             string result = Encoding. Default .GetString( Convert .FromBase64String(value));

             return  result;

         }

 

 

     }

}

 

转自：http://www.cnblogs.com/password1/p/5867781.html#3510274