标签：字符串 provider bytes des 解压 bsp asc 为我 pre
一、DES加密、解密
#region DES加密解密 /// <summary> /// 进行DES加密 /// </summary> /// <param name="pToEncrypt">要加密的字符串</param> /// <param name="sKey">密钥，必须为8位</param> /// <returns>以Base64格式返回的加密字符串</returns> public static string EncryptDES(string pToEncrypt, string sKey) { string key = MD5Encrypt(sKey); using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()) { byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt); des.Key = ASCIIEncoding.ASCII.GetBytes(key.Substring(8, 8)); des.IV = ASCIIEncoding.ASCII.GetBytes(key.Substring(0, 8)); System.IO.MemoryStream ms = new System.IO.MemoryStream(); using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write)) { cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); cs.Close(); } //byte[] b = ms.ToArray(); string str = Convert.ToBase64String(ms.ToArray());//System.Text.Encoding.UTF8.GetString(b, 0, b.Length); ms.Close(); return str; } } /// <summary> /// 解密 /// </summary> /// <param name="pToDecrypt"></param> /// <param name="sKey"></param> /// <returns></returns> public static string DecryptDES(string pToDecrypt, string sKey) { byte[] inputByteArray = Convert.FromBase64String(pToDecrypt);//Encoding.UTF8.GetBytes(pToDecrypt); string key = MD5Encrypt(sKey); using (DESCryptoServiceProvider des = new DESCryptoServiceProvider()) { des.Key = ASCIIEncoding.ASCII.GetBytes(key.Substring(8, 8)); des.IV = ASCIIEncoding.ASCII.GetBytes(key.Substring(0, 8)); MemoryStream ms = new MemoryStream(); using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write)) { cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); cs.Close(); } string str = Encoding.UTF8.GetString(ms.ToArray()); ms.Close(); return str; } } #endregion
二、MD5加密（16位）
#region MD5加密 /// <summary> /// 给一个字符串进行MD5加密 /// </summary> /// <param name="strText">待加密字符串</param> /// <returns>加密后的16位字符串</returns> private static string MD5Encrypt(string inputStr) { MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(inputStr)), 4, 8); t2 = t2.Replace("-", ""); t2 = t2.ToLower(); return t2; } #endregion
三、字符串的压缩、解压
#region 字符串压缩 /// <summary> /// 字符串压缩 /// </summary> /// <returns>The string.</returns> /// <param name="str">String.</param> public static string CompressString(string str) { string compressString = string.Empty; byte[] compressBeforeByte = Encoding.UTF8.GetBytes(str); byte[] compressAfterByte = Compress(compressBeforeByte); compressString = Convert.ToBase64String(compressAfterByte); return compressString; } /// <summary> /// 字符串解压缩 /// </summary> /// <returns>The string.</returns> /// <param name="str">String.</param> public static string DecompressString(string str) { string compressString = string.Empty; byte[] compressBeforeByte = Convert.FromBase64String(str); byte[] compressAfterByte = Decompress(compressBeforeByte); compressString = Encoding.UTF8.GetString(compressAfterByte); return compressString; } /// <summary> /// 字节数组压缩 /// </summary> /// <param name="strSource"></param> /// <returns></returns> private static byte[] Compress(byte[] data) { try { MemoryStream ms = new MemoryStream(); GZipStream zip = new GZipStream(ms, CompressionMode.Compress, true); zip.Write(data, 0, data.Length); zip.Close(); byte[] buffer = new byte[ms.Length]; ms.Position = 0; ms.Read(buffer, 0, buffer.Length); ms.Close(); return buffer; } catch (Exception e) { throw new Exception(e.Message); } } /// <summary> /// 字节数组解压缩 /// </summary> /// <param name="strSource"></param> /// <returns></returns> private static byte[] Decompress(byte[] data) { try { MemoryStream ms = new MemoryStream(data); GZipStream zip = new GZipStream(ms, CompressionMode.Decompress, true); MemoryStream msreader = new MemoryStream(); byte[] buffer = new byte[0x1000]; while (true) { int reader = zip.Read(buffer, 0, buffer.Length); if (reader <= 0) { break; } msreader.Write(buffer, 0, reader); } zip.Close(); ms.Close(); msreader.Position = 0; buffer = msreader.ToArray(); msreader.Close(); return buffer; } catch (Exception e) { throw new Exception(e.Message); } } #endregion
四、去掉\0
读取到的数据是“iAGAB8PHUpugMAAA==\0\0\0\0\0\0...\0\0”,在转成字符串以后不会看见\0，但是它还会存在，会影响后续的操作。因为我每个字符串的结尾肯定是“=”，只是不确定会有几个，所以只要从开始截取到最后一个“=”，就能得到我需要的数据。
string str = "2235=465876=68865845=2512436"; Console.WriteLine(str.Substring(0,str.LastIndexOf(‘=‘)+1));//注意+1
记录新项目中遇到的技术及自己忘记的技术点【DES加密解密，MD5加密，字符串压缩、解压，字符串截取等操作】
标签：字符串 provider bytes des 解压 bsp asc 为我 pre
原文地址：https://www.cnblogs.com/wsn1203/p/9341207.html
