/*
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* DES 使用一个 56 位的密钥以及附加的 8 位奇偶校验位，产生最大 64 位的分组大小。
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* 这是一个迭代的分组密码，使用称为 Feistel 的技术，其中将加密的文本块分成两半。
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* 使用子密钥对其中一半应用循环功能，然后将输出与另一半进行"异或"运算;
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* 接着交换这两半，这一过程会继续下去，但最后一个循环不交换。
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* DES 使用 16 个循环，使用异或，置换，代换，移位操作四种基本运算。
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*/
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using System;
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using System.Text;
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using System.Security.Cryptography;//这个是处理文字编码的前提
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using System.IO;
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namespace GTech.Solution.Api.Common
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{
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public static class DESEncrytion
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{
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#region 1、加密向量自定义
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/// <summary>
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/// DES加密方法
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/// </summary>
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/// <param name="strPlain">明文</param>
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/// <param name="strDESKey">密钥</param>
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/// <param name="strDESIV">向量</param>
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/// <returns>密文</returns>
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public static string DESEncrypt(string strPlain, string strDESKey, string strDESIV)
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{
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//把密钥转换成字节数组
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byte[] bytesDESKey = ASCIIEncoding.ASCII.GetBytes(strDESKey);
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//把向量转换成字节数组
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byte[] bytesDESIV = ASCIIEncoding.ASCII.GetBytes(strDESIV);
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//声明1个新的DES对象
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DESCryptoServiceProvider desEncrypt = new DESCryptoServiceProvider();
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//开辟一块内存流
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MemoryStream msEncrypt = new MemoryStream();
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//把内存流对象包装成加密流对象
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CryptoStream csEncrypt = new CryptoStream(msEncrypt, desEncrypt.CreateEncryptor(bytesDESKey, bytesDESIV), CryptoStreamMode.Write);
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//把加密流对象包装成写入流对象
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StreamWriter swEncrypt = new StreamWriter(csEncrypt);
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//写入流对象写入明文
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swEncrypt.WriteLine(strPlain);
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//写入流关闭
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swEncrypt.Close();
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//加密流关闭
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csEncrypt.Close();
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//把内存流转换成字节数组，内存流现在已经是密文了
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byte[] bytesCipher = msEncrypt.ToArray();
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//内存流关闭
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msEncrypt.Close();
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//把密文字节数组转换为字符串，并返回
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return UnicodeEncoding.Unicode.GetString(bytesCipher);
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}
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/// <summary>
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/// DES解密方法
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/// </summary>
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/// <param name="strCipher">密文</param>
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/// <param name="strDESKey">密钥</param>
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/// <param name="strDESIV">向量</param>
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/// <returns>明文</returns>
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public static string DESDecrypt(string strCipher, string strDESKey, string strDESIV)
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{
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//把密钥转换成字节数组
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byte[] bytesDESKey = ASCIIEncoding.ASCII.GetBytes(strDESKey);
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//把向量转换成字节数组
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byte[] bytesDESIV = ASCIIEncoding.ASCII.GetBytes(strDESIV);
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//把密文转换成字节数组
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byte[] bytesCipher = UnicodeEncoding.Unicode.GetBytes(strCipher);
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//声明1个新的DES对象
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DESCryptoServiceProvider desDecrypt = new DESCryptoServiceProvider();
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//开辟一块内存流，并存放密文字节数组
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MemoryStream msDecrypt = new MemoryStream(bytesCipher);
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//把内存流对象包装成解密流对象
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CryptoStream csDecrypt = new CryptoStream(msDecrypt, desDecrypt.CreateDecryptor(bytesDESKey, bytesDESIV), CryptoStreamMode.Read);
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//把解密流对象包装成读出流对象
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StreamReader srDecrypt = new StreamReader(csDecrypt);
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//明文=读出流的读出内容
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string strPlainText = srDecrypt.ReadLine();
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//读出流关闭
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srDecrypt.Close();
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//解密流关闭
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csDecrypt.Close();
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//内存流关闭
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msDecrypt.Close();
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//返回明文
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return strPlainText;
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}
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#endregion
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#region 2、加密向量默认值
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//默认密钥向量
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private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
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/// <summary>
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/// DES加密字符串
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/// </summary>
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/// <param name="encryptString">待加密的字符串</param>
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/// <param name="encryptKey">加密密钥,要求为8位</param>
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/// <returns>加密成功返回加密后的字符串，失败返回源串</returns>
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public static string EncryptDES(string encryptString, string encryptKey)
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{
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try
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{
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byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
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byte[] rgbIV = Keys;
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byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
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DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
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MemoryStream mStream = new MemoryStream();
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CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
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cStream.Write(inputByteArray, 0, inputByteArray.Length);
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cStream.FlushFinalBlock();
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return Convert.ToBase64String(mStream.ToArray());
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}
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catch
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{
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return encryptString;
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}
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}
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/// <summary>
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/// DES解密字符串
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/// </summary>
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/// <param name="decryptString">待解密的字符串</param>
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/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
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/// <returns>解密成功返回解密后的字符串，失败返源串</returns>
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public static string DecryptDES(string decryptString, string decryptKey)
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{
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try
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{
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byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
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byte[] rgbIV = Keys;
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byte[] inputByteArray = Convert.FromBase64String(decryptString);
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DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
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MemoryStream mStream = new MemoryStream();
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CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
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cStream.Write(inputByteArray, 0, inputByteArray.Length);
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cStream.FlushFinalBlock();
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return Encoding.UTF8.GetString(mStream.ToArray());
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}
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catch
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{
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return decryptString;
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}
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}
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#endregion
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}
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}
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