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.NET Core上面的DES等加密算法要等到1.2 才支持，我们可是急需这个算法的支持，文章《》需要用Nodejs，很多人觉得这个有点不好，今天就给大家介绍下BouncyCastle （Portable.BouncyCastle）库为我们提供的原生的.NET Core的支持库的Des算法。BouncyCastle的文档比较少，折腾了好久才写出了.NET 代码等价的一个封装。

  public class TDesbouncy

    {

        IBlockCipher engine = new DesEngine();

        /// <summary>

        /// 使用DES加密，key输入密码的时候，必须使用英文字符，区分大小写，且字符数量是8个，不能多也不能少        /// </summary>        /// <param name="plainText">需要加密的字符串</param>        /// <param name="keys">加密字符串的密钥</param>        /// <returns>加密后的字符串</returns>        public string Encrypt(string keys, string plainText)        {

            byte[] ptBytes = Encoding.UTF8.GetBytes(plainText);

            byte[] rv = Encrypt(keys, ptBytes);            StringBuilder ret = new StringBuilder();            foreach (byte b in rv)            {                ret.AppendFormat("{0:X2}", b);            }            return ret.ToString();        }

        private byte[] Encrypt(string keys, byte[] ptBytes)

        {            byte[] key = Encoding.UTF8.GetBytes(keys);            BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(engine),new Pkcs7Padding());            cipher.Init(true, new ParametersWithIV(new DesParameters(key),key));            byte[] rv = new byte[cipher.GetOutputSize(ptBytes.Length)];            int tam = cipher.ProcessBytes(ptBytes, 0, ptBytes.Length, rv, 0);

             cipher.DoFinal(rv, tam);

             return rv;        }

        /// <summary>

        /// 使用DES解密，key输入密码的时候，必须使用英文字符，区分大小写，且字符数量是8个，不能多也不能少        /// </summary>        /// <param name="cipherText">需要加密的字符串</param>        /// <param name="keys">加密字符串的密钥</param>        /// <returns>解密后的字符串</returns>        public string Decrypt(string keys, string cipherText)        {            byte[] inputByteArray = new byte[cipherText.Length / 2];            for (int x = 0; x < cipherText.Length / 2; x++)            {                int i = (Convert.ToInt32(cipherText.Substring(x * 2, 2), 16));                inputByteArray[x] = (byte)i;            }            var rv = Decrypt(keys, inputByteArray);

            return Encoding.UTF8.GetString(rv);

        }

        private byte[] Decrypt(string keys, byte[] cipherText)

        {            byte[] key = Encoding.UTF8.GetBytes(keys);            BufferedBlockCipher cipher = new PaddedBufferedBlockCipher(new CbcBlockCipher(engine));            cipher.Init(false, new ParametersWithIV(new DesParameters(key), key));            byte[] rv = new byte[cipher.GetOutputSize(cipherText.Length)];            int tam = cipher.ProcessBytes(cipherText, 0, cipherText.Length, rv, 0);

            cipher.DoFinal(rv, tam);

            return rv;

        }

    }

public static void Main(string[] args)

{                         Encoding.RegisterProvider(CodePagesEncodingProvider.Instance);

            string key = "geffzhan";

            string content =   "This project.config whoopla is a mess. So what they mean by .NetCore, you still have to reference everything correctly";

            TDesbouncy bouncy = new TDesbouncy();

            var encrypt = bouncy.Encrypt(key, content);

            Console.WriteLine(encrypt);

            string descontent = bouncy.Decrypt(key, encrypt);

            Console.WriteLine(descontent); }

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