二维码的生成使用工具：ZXing.Net
创建项目，并把ZXing.Net安装到项目中
创建二维码：
/// <summary> /// 创建二维码 /// </summary> /// <param name="msg">要生成的信息</param> /// <returns></returns> public static Bitmap Create(string msg) { MultiFormatWriter writer = new MultiFormatWriter(); Dictionary<EncodeHintType, object> hint = new Dictionary<EncodeHintType, object>(); hint.Add(EncodeHintType.CHARACTER_SET, "utf-8"); hint.Add(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); //设置纠错等级， 高 BitMatrix bm = writer.encode(msg, BarcodeFormat.QR_CODE, 300, 300, hint); BarcodeWriter barcodeWriter = new BarcodeWriter(); return barcodeWriter.Write(bm); } string str = "123"; Bitmap code = Create(str); string path = Environment.CurrentDirectory; code.Save(path + ".png", ImageFormat.Png);//当前bin目录下
二维码解码：
public static string decode(string imgPath) { BarcodeReader reader = new BarcodeReader(); Bitmap bp = new Bitmap(imgPath); Result result= reader.Decode(bp); return result.ToString(); } string path = @"G:2018codecodeinDebug.png"; Console.WriteLine(decode(path)); Console.ReadKey();
常用加密解密
MD5加密（不可逆加密）：
/// <summary> /// 将字符串进行MD5加密 /// </summary> /// <param name="str"></param> /// <returns></returns> public static string GetMD5Str(string str) { StringBuilder sb = new StringBuilder(); System.Security.Cryptography.MD5 md5 = System.Security.Cryptography.MD5.Create(); byte[] s; s = new byte[0]; if (str != null) { s = md5.ComputeHash(Encoding.UTF8.GetBytes(str)); } for (int i = 0; i < s.Length; i++) { sb.Append(s[i].ToString("X2")); } //md5Str就是最后得到加密后的字符串 string md5Str = sb.ToString(); return md5Str; }
DES加密：
/// <summary> 加密字符串 /// </summary> /// <param name="strText">需被加密的字符串</param> /// <param name="strEncrKey">密钥</param> /// <returns></returns> public static string DesEncrypt(string strText, string strEncrKey) { try { byte[] byKey = null; byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; //加密秘钥要大于8位 byKey = Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray = Encoding.UTF8.GetBytes(strText); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); return Convert.ToBase64String(ms.ToArray()); } catch { return ""; } } string str = "123465"; string key = "goodgoodstudy"; Console.WriteLine(DesEncrypt(str, key)); Console.ReadKey();
DES解密：
/// <summary> 解密字符串 /// </summary> /// <param name="strText">需被解密的字符串</param> /// <param name="sDecrKey">密钥</param> /// <returns></returns> public static string DesDecrypt(string strText, string sDecrKey) { try { byte[] byKey = null; byte[] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; byte[] inputByteArray = new Byte[strText.Length]; byKey = Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); inputByteArray = Convert.FromBase64String(strText); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); Encoding encoding = new UTF8Encoding(); return encoding.GetString(ms.ToArray()); } catch { return null; } } string str = "123465"; string key = "goodgoodstudy"; string ss = DesEncrypt(str, key); Console.WriteLine(DesDecrypt(ss, key)); Console.ReadKey();
RSA 秘钥生成：
/// <summary>生成RSA加密 解密的 密钥 /// </summary> /// <param name="path">要生成的密钥文件的路径(文件夹)</param> public static void getRSAKey(string path) { RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(); string datetimestr = System.DateTime.Now.ToString("yyyyMMddHHmmss"); using (StreamWriter writer = new StreamWriter("RSA解密_PrivateKey_" + datetimestr + ".xml")) { writer.WriteLine(rsa.ToXmlString(true)); } using (StreamWriter writer = new StreamWriter("RSA加密_PublicKey_" + datetimestr + ".xml")) { writer.WriteLine(rsa.ToXmlString(false)); } } string path = @"G:2018codecodein"; getRSAKey(path);
会在debug文件夹生成公钥和私钥：
RSA加密：
/// <summary>RSA加密 /// </summary> /// <param name="plaintext">明文</param> /// <param name="publicKey">公钥</param> /// <returns>密文字符串</returns> public static string EncryptByRSA(string plaintext, string publicKey) { try { UnicodeEncoding ByteConverter = new UnicodeEncoding(); byte[] dataToEncrypt = ByteConverter.GetBytes(plaintext); using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider()) { RSA.FromXmlString(publicKey); byte[] encryptedData = RSA.Encrypt(dataToEncrypt, false); return Convert.ToBase64String(encryptedData); } } catch (Exception) { return null; } } string str = "123465"; string publicKey = @"G:2018codecodeinDebugRSA 加密_PublicKey_20180420145359.xml"; Console.WriteLine(EncryptByRSA(str, File.ReadAllText(publicKey))); Console.ReadKey();
RSA解密：
/// <summary> RSA解密 /// </summary> /// <param name="ciphertext">密文</param> /// <param name="privateKey">私钥</param> /// <returns>明文字符串</returns> public static string DecryptByRSA(string ciphertext, string privateKey) { try { UnicodeEncoding byteConverter = new UnicodeEncoding(); using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider()) { RSA.FromXmlString(privateKey); byte[] encryptedData = Convert.FromBase64String(ciphertext); byte[] decryptedData = RSA.Decrypt(encryptedData, false); return byteConverter.GetString(decryptedData); } } catch (Exception) { return null; } } string str = "123465"; string publicKey = @"G:2018codecodeinDebugRSA加密_PublicKey_20180420145359.xml"; string privateKey = @"G:2018codecodeinDebugRSA解密_PrivateKey_20180420145359.xml"; string ss=EncryptByRSA(str, File.ReadAllText(publicKey)); Console.WriteLine(DecryptByRSA(ss, File.ReadAllText(privateKey))); Console.ReadKey();