using System; using System.IO; using System.Security.Cryptography; using System.Text; namespace Common { /// <summary> /// 采用 3DES 加解密方式。 /// </summary> public class EncryptAndDecrypte { static string strKey = "fdbc4y6hdhKlf4M3mjgGrMC3PbryXrxw"; static string strIV = "RfnMfrpec48="; /// <summary> /// 默认加密字符串。 /// </summary> /// <param name="ConnString"></param> /// <returns></returns> public static string EncryptString(string encryptString) { if (string.IsNullOrWhiteSpace(encryptString)) return encryptString; return Convert.ToBase64String(EncryptAndDecrypte.EncryptString( encryptString, Convert.FromBase64String(strKey), Convert.FromBase64String(strIV) ) ); } /// <summary> /// 默认解密字符串 /// </summary> /// <param name="EncryptedConnectionString"></param> /// <returns></returns> public static string DecrypteString(string EncryptedConnectionString) { if (string.IsNullOrWhiteSpace(EncryptedConnectionString)) return EncryptedConnectionString; return EncryptAndDecrypte.DecrypteString( Convert.FromBase64String(EncryptedConnectionString), Convert.FromBase64String(strKey), Convert.FromBase64String(strIV) ).TrimEnd('\0'); } /// <summary> /// 使用指定的 Key 和 IV 加密 。 /// </summary> /// <param name="ToEncryptString"></param> /// <param name="byKey"></param> /// <param name="byIV"></param> /// <returns></returns> private static byte[] EncryptString(string ToEncryptString, byte[] byKey, byte[] byIV) { if (string.IsNullOrWhiteSpace(ToEncryptString)) return null; MemoryStream memStm = new MemoryStream(); TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider(); CryptoStream encStream = null; encStream = new CryptoStream( memStm, tdes.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write ); byte[] byIn = Encoding.Default.GetBytes(ToEncryptString); encStream.Write(byIn, 0, byIn.Length); encStream.FlushFinalBlock(); encStream.Close(); return memStm.ToArray(); } /// <summary> /// 使用指定的 Key 和 IV 解密。 /// </summary> /// <param name="byIn"></param> /// <param name="byKey"></param> /// <param name="byIV"></param> /// <returns></returns> private static string DecrypteString(byte[] byIn, byte[] byKey, byte[] byIV) { if (byIn == null || byIn.Length == 0) return string.Empty; MemoryStream memStm = new MemoryStream(byIn); TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider(); CryptoStream encStream = new CryptoStream( memStm, tdes.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read ); byte[] fromEncrypt = new byte[byIn.Length]; encStream.Read(fromEncrypt, 0, fromEncrypt.Length); encStream.Close(); string strRet = Encoding.Default.GetString(fromEncrypt); return strRet; } /// <summary> /// 获取随机（种子是 GUID 的 Byte 的和）长度的Byte数组. /// </summary> /// <param name="Len">要得到的数组的长度</param> /// <returns></returns> private static byte[] GetBytes(int Len) { int Seed = 0; byte[] bySeed = Guid.NewGuid().ToByteArray(); foreach (byte byt in bySeed) { Seed += byt; } byte[] byKey = new byte[Len]; new Random(Seed).NextBytes(byKey); return byKey; } /// <summary> /// 获取 Key 和 IV ， 如果失败，返回null。 /// </summary> /// <param name="Key"></param> /// <param name="IV"></param> public static void TryGetKeyAndIV(out byte[] Key, out byte[] IV) { TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider(); for (int i = 200; i > 0; i--) { try { Key = GetBytes(i); IV = GetBytes(i); tdes.CreateDecryptor(Key, IV); return; } catch { } } Key = null; IV = null; return; } } }
转载于:https://www.cnblogs.com/xsmhero/p/3300833.html
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