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DES加密深度优化——随机生成加密字符串
DES全称为Data Encryption Standard，即数据加密标准，是一种使用密钥加密的块算法。但该算法一旦密钥固定，加密的字符串也就随之固定，这不利于数据存储安全。而且用该方法加密后有一个显著的标记，末位几位为‘=’。所有本次优化对密钥和去等进行了一些优化。
首先我们生成8位随机字符串作为加密的key值。
private static string so = "1234567890abcdefghijklmnopqrstuvwxyzQWERTYUIOPASDFGHJKLZXCVBNM"; /// <summary> /// 生成内容随机key /// </summary> /// <returns></returns> public static string GetContent() { Random rand = new Random(); string str = null; for (int i = 0; i < 8; i++) { str += so.Substring(rand.Next(62), 1); } return str; }
然后将key值进行拆分为两部分。
Random rand = new Random(); int r = rand.Next(9); string encryptKey = GetContent(); string first = encryptKey.Substring(0, r); string last = encryptKey.Substring(r);
最后对需加密的字符串进行DES加密，并记录等号的个数并截取去除等号字符串，然后与key值左右部分拼接。
private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; /// <summary> /// DES加密字符串 /// </summary> /// <param name="encryptString">待加密的字符串</param> /// <returns>加密成功返回加密后的字符串，失败返回源串</returns> public static string Encrypt(string encryptString) { try { Random rand = new Random(); int r = rand.Next(9); string encryptKey = GetContent(); string first = encryptKey.Substring(0, r); string last = encryptKey.Substring(r); byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8)); byte[] rgbIV = Keys; byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString); DESCryptoServiceProvider dCsp = new DESCryptoServiceProvider(); MemoryStream mStream = new MemoryStream(); CryptoStream cStream = new CryptoStream(mStream, dCsp.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write); cStream.Write(inputByteArray, 0, inputByteArray.Length); cStream.FlushFinalBlock(); string str = Convert.ToBase64String(mStream.ToArray()); int i = 0; for (int j = str.Length - 1; j > 0; j--) { if (str[j] != ‘=‘) { break; } else { i++; } } str = str.Substring(0, str.Length - i); return i.ToString()+r.ToString()+first + str +last; } catch { return encryptString; } }
对加密的字符串进行解密。
/// <summary> /// DES解密字符串 /// </summary> /// <param name="decryptString">待解密的字符串</param> /// <returns>解密成功返回解密后的字符串，失败返源串</returns> public static string Decrypt(string decryptString) { try { int code = Int32.Parse(decryptString.Substring(1, 1)); int i = Int32.Parse(decryptString.Substring(0, 1)); string first = decryptString.Substring(2, code); string last = decryptString.Substring(decryptString.Length - 8 + code); string encryptKey =first+last; decryptString = decryptString.Substring(code + 2, decryptString.Length - 10); for (int j = 0; j < i; j++) { decryptString += "="; } byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey); byte[] rgbIV = Keys; byte[] inputByteArray = Convert.FromBase64String(decryptString); DESCryptoServiceProvider dcsp = new DESCryptoServiceProvider(); MemoryStream mStream = new MemoryStream(); CryptoStream cStream = new CryptoStream(mStream, dcsp.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write); cStream.Write(inputByteArray, 0, inputByteArray.Length); cStream.FlushFinalBlock(); return Encoding.UTF8.GetString(mStream.ToArray()); } catch { return decryptString; } }
应用及演示：
public static void Main(string[] args) { string str = "xuhang"; for (int i = 0; i < 10; i++) { var m = DesNew.Encrypt(str); Console.WriteLine(m); Console.WriteLine(DesNew.Decrypt(m)); Console.WriteLine("------------------------------"); Thread.Sleep(500); //0.5s后唤醒线程，避免由于时间短生成的数据一致 } }
DES加密深度优化——随机生成加密字符串
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