c# 加密工具类

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, , toEncryptArray.Length);

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

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

                return Encoding.UTF8.GetString(resultArray);
            }
            catch
            {
                return string.Empty;
            }
        }

        public static string MD5(string value,Encoding encoding=null)
        {
            if (encoding == null)
            {
                encoding = Encoding.UTF8;
            }
            byte[] result = encoding.GetBytes(value);
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] output = md5.ComputeHash(result);

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

        public static string HMACMD5(string value, string hmacKey, Encoding encoding = null)
        {
            if (encoding == null)
            {
                encoding = Encoding.UTF8;
            }
            HMACMD5 hmacsha1 = new HMACMD5(encoding.GetBytes(hmacKey));
            byte[] result = encoding.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;
        }

    }
}