c# 使用DES加密和解密字符串

小鱼儿 2022-09-30 04:57 174阅读 0赞

转自：http://www.great-code.com/show/119

/// <summary> /// 使用DES加密字符串 /// </summary> /// <param name="stringToEncrypt">待加密字符串</param> /// <param name="strKEY">8位字符加密密钥</param> /// <returns></returns> public static string EncryptStringByDES(string stringToEncrypt,string KEY) \{ if (string.IsNullOrEmpty(KEY)||Encoding.UTF8.GetBytes(KEY).Length!=8) KEY = "$Ap1bi$."; byte\[\] key = \{ \}; byte\[\] IV = \{ 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78 \}; try \{ key = Encoding.UTF8.GetBytes(KEY); using (DESCryptoServiceProvider oDESCrypto = new DESCryptoServiceProvider()) \{ byte\[\] inputByteArray = Encoding.UTF8.GetBytes(stringToEncrypt); MemoryStream oMemoryStream = new MemoryStream(); CryptoStream oCryptoStream = new CryptoStream(oMemoryStream, oDESCrypto.CreateEncryptor(key, IV), CryptoStreamMode.Write); oCryptoStream.Write(inputByteArray, 0, inputByteArray.Length); oCryptoStream.FlushFinalBlock(); return Convert.ToBase64String(oMemoryStream.ToArray()); \} \} catch (Exception ex) \{ throw ex; \} \} /// <summary> /// 使用DES解密字符串 /// </summary> /// <param name="stringToDecrypt">待解密字符串</param> /// <param name="strKEY">8位字符解密密钥</param> /// <returns></returns> public static string DecryptStringByDES(string stringToDecrypt, string KEY) \{ if (string.IsNullOrEmpty(KEY) || Encoding.UTF8.GetBytes(KEY).Length != 8) KEY = "$Apa1i$."; byte\[\] key = \{ \}; byte\[\] IV = \{ 0x01, 0x12, 0x23, 0x34, 0x45, 0x56, 0x67, 0x78 \}; stringToDecrypt = stringToDecrypt.Replace(" ", "+"); byte\[\] inputByteArray = new byte\[stringToDecrypt.Length\]; try \{ key = Encoding.UTF8.GetBytes(KEY); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); inputByteArray = Convert.FromBase64String(stringToDecrypt); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(key, IV), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); Encoding encoding = Encoding.UTF8; return encoding.GetString(ms.ToArray()); \} catch (Exception ex) \{ throw ex; \} \}