在.NET Core 里使用 BouncyCastle 的DES加密算法

.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《使用 JavaScriptService 在.NET Core 里实现DES加密算法》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）https://www.nuget.org/packages/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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相关资源：org.bouncycastle包