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Asp.net 加密解密类

来源:Web龙都娱乐 发布时间:2012-02-04 阅读次数:
这里给大家一个现成的C#加密解密类,由 admin10000.com 提供,包含MD5、SHA1、DES加密和解密,Base64编码解码。 首先导入命名空间 using System.Web.Security; using System.Security.Cryptography; using System.Text; using System.IO;
/// <summary>
/// EncryptHelper 来自 www.Admin10000.com
/// </summary>
public class EncryptHelper
{
        
// 提供8个字符作为DES密钥(程序自动截取前8个字符)
        private static string key = "admin10000.com";

        
/// <summary>
        /// DES对称加密解密的密钥
        
/// </summary>
        public static string Key
        {
                
get
                {
                        
return key;
                }
                
set
                {
                        key
= value;
                }
        }

        
/// <summary>
        /// MD5 加密(不可逆加密)
        
/// </summary>
        /// <param name="pass">要加密的原始字串</param>
        /// <returns></returns>
        public static string MD5Encrypt(string pass)
        {    
                System.Security.Cryptography.MD5 md5
= new System.Security.Cryptography.MD5CryptoServiceProvider();
                
byte[] bytResult = md5.ComputeHash(System.Text.Encoding.UTF8.GetBytes(pass));
                md5.Clear();
                
string strResult = BitConverter.ToString(bytResult);
                strResult
= strResult.Replace("-", "");
                
return strResult;        
                
/* 另一种方法
                pass = FormsAuthentication.HashPasswordForStoringInConfigFile(pass, "MD5");
                return pass;
                
*/    
        }

        
/// <summary>
        /// SHA1 加密(不可逆加密)
        
/// </summary>
        /// <param name="pass">要加密的原始字串</param>
        /// <returns></returns>
        public static string SHA1Encrypt(string pass)
        {
                System.Security.Cryptography.SHA1 sha1
= new System.Security.Cryptography.SHA1CryptoServiceProvider();
                
byte[] bytResult = sha1.ComputeHash(System.Text.Encoding.UTF8.GetBytes(pass));
                sha1.Clear();
                
string strResult = BitConverter.ToString(bytResult);
                strResult
= strResult.Replace("-", "");
                
return strResult;
                
/* 另一种方法
                pass = FormsAuthentication.HashPasswordForStoringInConfigFile(pass, "SHA1");
                return pass;
                
*/
        }

        
/// <summary>
        /// DES加密字符串
        
/// </summary>
        /// <param name="encryptString">待加密的字符串</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 DESEncrypt(string encryptString)
        {
                
try
                {
                        
byte[] rgbKey = Encoding.UTF8.GetBytes(key.Substring(0, 8));
                        
byte[] rgbIV = rgbKey;
                        
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();
                        cStream.Close();
                        
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>
        /// <returns>解密成功返回解密后的字符串,失败返源串</returns>
        public static string DESDecrypt(string decryptString)
        {
                
try
                {
                        
byte[] rgbKey = Encoding.UTF8.GetBytes(key.Substring(0, 8));
                        
byte[] rgbIV = rgbKey;
                        
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();
                        cStream.Close();
                        
return Encoding.UTF8.GetString(mStream.ToArray());
                }
                
catch
                {
                        
return decryptString;
                }
        }

        
/// <summary>
        /// 将普通字符串编码为BASE64字串
        
/// </summary>
        /// <param name="str">源字符串</param>
        /// <returns></returns>
        public static string Base64Encode(string str)
        {
                
return Convert.ToBase64String(Encoding.UTF8.GetBytes(str));
        }

        
/// <summary>
        /// 解码BASE64字串
        
/// </summary>
        /// <param name="str">Base64字串</param>
        /// <returns></returns>
        public static string Base64Decode(string base64Str)
        {
                
return Encoding.UTF8.GetString(Convert.FromBase64String(base64Str));
        }
}
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