Asp.Net Core 2.0 项目实战（7）MD5加密、AES&DES对称加解密

本文目录
1. 摘要
2. MD5加密封装

3. AES的加密、解密
4. DES加密/解密
5. 总结

1. 摘要

　　C#中常用的一些加密和解密方案，如：md5加密、RSA加密与解密和DES加密等，Asp.Net Core 2.0下该如何调整与使用我们以前常用的解加密算法类呢，下面是我整理的MD5加密、AES&DES对称加解密、Encrypt&Decrypt加解密完整实例。希望能给大家提供一些参考和帮助。

2. MD5加密封装

　　MD5常用加密FormsAuthentication.HashPasswordForStoringInConfigFile在Net Freamwork4.5以后就不在支持，下面整理了32位或16位下的几个方法，以及不同写法，最后一个由从老版本迁移过来，后续淘汰不用。

using System;

using System.Collections.Generic;

using System.Security.Cryptography;

using System.Text;

namespace NC.Common

{

    /// <summary>

    /// 此类获取md5加密值均为大写，如果要获取小写：MD5Comm.Get32MD5One(xx).ToLower();或完善此类。

    /// </summary>

    public class MD5Comm

    {

        #region --Expired code--

        ///// <summary>

        ///// MD5加密

        ///// </summary>

        //public string Md5(string txt)

        //{

        //    //return FormsAuthentication.HashPasswordForStoringInConfigFile(txt, "MD5");//此方法nf4.5后不再支持

        //}

        //public string Md5Pass(string pwd)

        //{

        //    return Md5(pwd + "Jiahao");

        //}

        #endregion

        /// <summary>

        /// 此代码示例通过创建哈希字符串适用于任何 MD5 哈希函数 （在任何平台） 上创建 32 个字符的十六进制格式哈希字符串

        /// 官网案例改编

        /// </summary>

        /// <param name="source"></param>

        /// <returns></returns>

        public static string Get32MD5One(string source)

        {

            using (MD5 md5Hash = MD5.Create())

            {

                byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(source));

                StringBuilder sBuilder = new StringBuilder();

                for (int i = ; i < data.Length; i++)

                {

                    sBuilder.Append(data[i].ToString("x2"));

                }

                string hash = sBuilder.ToString();

                return hash.ToUpper();

            }

        }

        /// <summary>

        /// 获取16位md5加密

        /// </summary>

        /// <param name="source"></param>

        /// <returns></returns>

        public static string Get16MD5One(string source)

        {

            using (MD5 md5Hash = MD5.Create())

            {

                byte[] data = md5Hash.ComputeHash(Encoding.UTF8.GetBytes(source));

                //转换成字符串，并取9到25位

                string sBuilder = BitConverter.ToString(data, , );

                //BitConverter转换出来的字符串会在每个字符中间产生一个分隔符，需要去除掉

                sBuilder = sBuilder.Replace("-", "");

                return sBuilder.ToString().ToUpper();

            }

        }

        //// <summary>

        /// </summary>

        /// <param name="strSource">需要加密的明文</param>

        /// <returns>返回32位加密结果，该结果取32位加密结果的第9位到25位</returns>

        public static string Get32MD5Two(string source)

        {

            System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();

            //获取密文字节数组

            byte[] bytResult = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(source));

            //转换成字符串，32位

            string strResult = BitConverter.ToString(bytResult);

            //BitConverter转换出来的字符串会在每个字符中间产生一个分隔符，需要去除掉

            strResult = strResult.Replace("-", "");

            return strResult.ToUpper();

        }

        //// <summary>

        /// </summary>

        /// <param name="strSource">需要加密的明文</param>

        /// <returns>返回16位加密结果，该结果取32位加密结果的第9位到25位</returns>

        public static string Get16MD5Two(string source)

        {

            System.Security.Cryptography.MD5 md5 = new System.Security.Cryptography.MD5CryptoServiceProvider();

            //获取密文字节数组

            byte[] bytResult = md5.ComputeHash(System.Text.Encoding.Default.GetBytes(source));

            //转换成字符串，并取9到25位

            string strResult = BitConverter.ToString(bytResult, , );

            //BitConverter转换出来的字符串会在每个字符中间产生一个分隔符，需要去除掉

            strResult = strResult.Replace("-", "");

            return strResult.ToUpper();

        }

        /// <summary>

        /// 自定义MD5函数,32位,从老版本迁移过来，后续淘汰不用。与Get32MD5One重复

        /// </summary>

        public static string Get32MD5Old(string str)

        {

            byte[] b = Encoding.UTF8.GetBytes(str);

            b = new MD5CryptoServiceProvider().ComputeHash(b);

            string ret = "";

            for (int i = ; i < b.Length; i++)

                ret += b[i].ToString("x").PadLeft(, '');

            return ret.ToUpper();

        }

    }

}

3. AES的加密、解密

　　上面我们介绍了MD5加密封装，接下来分享给大家供大家参考一下AES加密、解密，AES要注意的是32位密匙。AES 加密解密(高级加密标准，是下一代的加密算法标准，速度快，安全级别高，目前 AES 标准的一个实现是 Rijndael 算法)

using System;

using System.IO;

using System.Text;

using System.Security.Cryptography;

namespace NC.Common

{

    /// <summary>

    /// 加密

    /// </summary>

    public class AES

    {

        //默认密钥向量

        private static byte[] Keys = { 0x41, 0x72, 0x65, 0x79, 0x6F, 0x75, 0x6D, 0x79, 0x53, 0x6E, 0x6F, 0x77, 0x6D, 0x61, 0x6E, 0x3F };

        public static string Encode(string encryptString, string encryptKey)

        {

            encryptKey = GetSubString(encryptKey,, , "");

            encryptKey = encryptKey.PadRight(, ' ');

            RijndaelManaged rijndaelProvider = new RijndaelManaged();

            rijndaelProvider.Key = Encoding.UTF8.GetBytes(encryptKey.Substring(, ));

            rijndaelProvider.IV = Keys;

            ICryptoTransform rijndaelEncrypt = rijndaelProvider.CreateEncryptor();

            byte[] inputData = Encoding.UTF8.GetBytes(encryptString);

            byte[] encryptedData = rijndaelEncrypt.TransformFinalBlock(inputData, , inputData.Length);

            return Convert.ToBase64String(encryptedData);

        }

        public static string Decode(string decryptString, string decryptKey)

        {

            try

            {

                decryptKey = GetSubString(decryptKey,, , "");

                decryptKey = decryptKey.PadRight(, ' ');

                RijndaelManaged rijndaelProvider = new RijndaelManaged();

                rijndaelProvider.Key = Encoding.UTF8.GetBytes(decryptKey);

                rijndaelProvider.IV = Keys;

                ICryptoTransform rijndaelDecrypt = rijndaelProvider.CreateDecryptor();

                byte[] inputData = Convert.FromBase64String(decryptString);

                byte[] decryptedData = rijndaelDecrypt.TransformFinalBlock(inputData, , inputData.Length);

                return Encoding.UTF8.GetString(decryptedData);

            }

            catch

            {

                return "";

            }

        }

        public static string GetSubString(string p_SrcString, int p_StartIndex, int p_Length, string p_TailString)

        {

            string myResult = p_SrcString;

            Byte[] bComments = Encoding.UTF8.GetBytes(p_SrcString);

            foreach (char c in Encoding.UTF8.GetChars(bComments))

            {    //当是日文或韩文时(注:中文的范围:\u4e00 - \u9fa5, 日文在\u0800 - \u4e00, 韩文为\xAC00-\xD7A3)

                if ((c > '\u0800' && c < '\u4e00') || (c > '\xAC00' && c < '\xD7A3'))

                {

                    //if (System.Text.RegularExpressions.Regex.IsMatch(p_SrcString, "[\u0800-\u4e00]+") || System.Text.RegularExpressions.Regex.IsMatch(p_SrcString, "[\xAC00-\xD7A3]+"))

                    //当截取的起始位置超出字段串长度时

                    if (p_StartIndex >= p_SrcString.Length)

                        return "";

                    else

                        return p_SrcString.Substring(p_StartIndex,

                                                       ((p_Length + p_StartIndex) > p_SrcString.Length) ? (p_SrcString.Length - p_StartIndex) : p_Length);

                }

            }

            if (p_Length >= )

            {

                byte[] bsSrcString = Encoding.Default.GetBytes(p_SrcString);

                //当字符串长度大于起始位置

                if (bsSrcString.Length > p_StartIndex)

                {

                    int p_EndIndex = bsSrcString.Length;

                    //当要截取的长度在字符串的有效长度范围内

                    if (bsSrcString.Length > (p_StartIndex + p_Length))

                    {

                        p_EndIndex = p_Length + p_StartIndex;

                    }

                    else

                    {   //当不在有效范围内时,只取到字符串的结尾

                        p_Length = bsSrcString.Length - p_StartIndex;

                        p_TailString = "";

                    }

                    int nRealLength = p_Length;

                    int[] anResultFlag = new int[p_Length];

                    byte[] bsResult = null;

                    int nFlag = ;

                    for (int i = p_StartIndex; i < p_EndIndex; i++)

                    {

                        if (bsSrcString[i] > )

                        {

                            nFlag++;

                            if (nFlag == )

                                nFlag = ;

                        }

                        else

                            nFlag = ;

                        anResultFlag[i] = nFlag;

                    }

                    if ((bsSrcString[p_EndIndex - ] > ) && (anResultFlag[p_Length - ] == ))

                        nRealLength = p_Length + ;

                    bsResult = new byte[nRealLength];

                    Array.Copy(bsSrcString, p_StartIndex, bsResult, , nRealLength);

                    myResult = Encoding.Default.GetString(bsResult);

                    myResult = myResult + p_TailString;

                }

            }

            return myResult;

        }

    }

}

4. DES加密/解密

　　除了MD5加密、AES加密/解密之外还经常用到DES加密、解密，注意的是DES的密匙是8位的，这里有家婆MD5加密一起使用。

using System;

using System.Security.Cryptography;

using System.Text;

namespace NC.Common

{

    /// <summary>

    /// DES加密/解密类。

    /// </summary>

    public class DESEncrypt

    {

        #region --加密--

        /// <summary>

        /// 加密

        /// </summary>

        /// <param name="Text"></param>

        /// <returns></returns>

        public static string Encrypt(string Text)

        {

            return Encrypt(Text, "ncmvc");

        }

        /// <summary>

        /// 加密数据

        /// </summary>

        /// <param name="Text"></param>

        /// <param name="sKey"></param>

        /// <returns></returns>

        public static string Encrypt(string Text, string sKey)

        {

            try

            {

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();

                byte[] inputByteArray;

                inputByteArray = Encoding.Default.GetBytes(Text);

                string md5SKey = MD5Comm.Get32MD5One(sKey).Substring(, );

                des.Key = ASCIIEncoding.ASCII.GetBytes(md5SKey);

                des.IV = ASCIIEncoding.ASCII.GetBytes(md5SKey);

                System.IO.MemoryStream ms = new System.IO.MemoryStream();

                CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);

                cs.Write(inputByteArray, , inputByteArray.Length);

                cs.FlushFinalBlock();

                StringBuilder ret = new StringBuilder();

                foreach (byte b in ms.ToArray())

                {

                    ret.AppendFormat("{0:X2}", b);

                }

                return ret.ToString();

            }

            catch { return "error"; }

        }

        #endregion

        #region --解密--

        /// <summary>

        /// 解密

        /// </summary>

        /// <param name="Text"></param>

        /// <returns></returns>

        public static string Decrypt(string Text)

        {

            return Decrypt(Text, "ncmvc");

        }

        /// <summary>

        /// 解密数据

        /// </summary>

        /// <param name="Text"></param>

        /// <param name="sKey"></param>

        /// <returns></returns>

        public static string Decrypt(string Text, string sKey)

        {

            try

            {

                DESCryptoServiceProvider des = new DESCryptoServiceProvider();

                int len;

                len = Text.Length / ;

                byte[] inputByteArray = new byte[len];

                int x, i;

                for (x = ; x < len; x++)

                {

                    i = Convert.ToInt32(Text.Substring(x * , ), );

                    inputByteArray[x] = (byte)i;

                }

                string md5SKey = MD5Comm.Get32MD5One(sKey).Substring(, );

                des.Key = ASCIIEncoding.ASCII.GetBytes(md5SKey);

                des.IV = ASCIIEncoding.ASCII.GetBytes(md5SKey);

                System.IO.MemoryStream ms = new System.IO.MemoryStream();

                CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);

                cs.Write(inputByteArray, , inputByteArray.Length);

                cs.FlushFinalBlock();

                return Encoding.Default.GetString(ms.ToArray());

            }

            catch { return "error"; }

        }

        #endregion

    }

}

5. 总结

　　Asp.Net Core 2.0下加解密封装类分享给大家，供参考！文中有不合理之处望告知，欢迎批评指正。以前做项目常用的几种加密方式，在Net Core2.0下经过重新整理，好的延续，不合理方法弃用。相关案例使用方法欢迎大家继续关注《Asp.Net Core 2.0项目实战》系列。