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