这一章我们将上一章的内容做进一步完善，由用户输入需要加密的序列号，进行加密：
因为我们输入的都是以字符的形式读取，所以第一步要将读取到的字符存入到数组中： char[] inputBuf = str.ToCharArray();
之后对这个数组进行转换成16进制，例如输入A5两个字符，我们要将其转成16进制数，即为0xA5，并将其装入byte数组内。
if (inputBuf[j] >= ‘0‘ && ‘9‘ >= inputBuf[j]) outBuf[i] = (byte)(inputBuf[j++] - ‘0‘); else if ((‘f‘ >= inputBuf[j]) && (inputBuf[j] >= ‘a‘)) outBuf[i] = (byte)(inputBuf[j++] - 0x57); else if ((‘F‘ >= inputBuf[j]) && (inputBuf[j] >= ‘A‘)) outBuf[i] = (byte)(inputBuf[j++] - 0x37); else throw new Exception("ERROR: Format incorrect."); outBuf[i] <<= 4; if (inputBuf[j] >= ‘0‘ && ‘9‘ >= inputBuf[j]) outBuf[i] |= (byte)(inputBuf[j++] - ‘0‘); else if ((‘f‘ >= inputBuf[j]) && (inputBuf[j] >= ‘a‘)) outBuf[i] |= (byte)(inputBuf[j++] - 0x57); else if ((‘F‘ >= inputBuf[j]) && (inputBuf[j] >= ‘A‘)) outBuf[i] |= (byte)(inputBuf[j++] - 0x37); else throw new Exception("ERROR: Format incorrect.");
最后有我们内部定义的秘钥对这个byte数组元素进行加密，完成我们的加密算法：
aes.IV = new byte[16]; aes.Key = new byte[] { 0x1F, 0x54, 0x52, 0x6A, 0x73, 0x93, 0x58, 0x9E, 0x4B, 0xCF, 0xFB, 0xAE, 0xFC, 0x97, 0x59, 0x3E }; //aes.Mode = CipherMode.CBC; aes.Padding = PaddingMode.None; var cryptoTransform = aes.CreateEncryptor(); byte[] resultBuff = cryptoTransform.TransformFinalBlock(outBuf, 0, outBuf.Length);
为了美观，我们可以对字体进行颜色修改： Console.ForegroundColor = ConsoleColor.yourColorCode;
完整代码：
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 using System.Security.Cryptography; 7 8 namespace aesDemo 9 { 10 class Program 11 { 12 static void Main(string[] args) 13 { 14 Console.WriteLine("========================================================================"); 15 Console.WriteLine(" Copyright: GALAXY .ltd in China"); 16 Console.WriteLine(" Designed by: Milo lu"); 17 Console.WriteLine(" Date: Des 05 2019"); 18 Console.WriteLine(" Version: 12052019"); 19 Console.WriteLine("e.g."); 20 Console.WriteLine(" enter:FD5D9BE05cdb8376a1861896fd5d9be0"); 21 Console.WriteLine(" print: 05F14C987E2E65FC6AB5A41CA7B5429D"); 22 Console.WriteLine("========================================================================="); 23 int color = 2; 24 while (true) 25 { 26 try 27 { 28 using (var aes = new RijndaelManaged()) 29 { 30 Console.ForegroundColor = (System.ConsoleColor)color++; 31 if (color >= 16) color = 2; 32 Console.WriteLine("-------------------------------------------"); 33 Console.WriteLine("Enter 16 hex:"); 34 string str = Console.ReadLine(); 35 36 if(str.Length!=32) 37 { 38 if (str == "exit" || str == "EXIT") 39 { 40 break; 41 } 42 throw new Exception("ERROR: Enter 16 hex."); 43 } 44 char[] inputBuf = str.ToCharArray(); 45 byte[] outBuf=new byte[16]; 46 for (int i = 0, j = 0; i < 16; i++) 47 { 48 if (inputBuf[j] >= ‘0‘ && ‘9‘ >= inputBuf[j]) outBuf[i] = (byte)(inputBuf[j++] - ‘0‘); 49 else if ((‘f‘ >= inputBuf[j]) && (inputBuf[j] >= ‘a‘)) outBuf[i] = (byte)(inputBuf[j++] - 0x57); 50 else if ((‘F‘ >= inputBuf[j]) && (inputBuf[j] >= ‘A‘)) outBuf[i] = (byte)(inputBuf[j++] - 0x37); 51 else throw new Exception("ERROR: Format incorrect."); 52 outBuf[i] <<= 4; 53 if (inputBuf[j] >= ‘0‘ && ‘9‘ >= inputBuf[j]) outBuf[i] |= (byte)(inputBuf[j++] - ‘0‘); 54 else if ((‘f‘ >= inputBuf[j]) && (inputBuf[j] >= ‘a‘)) outBuf[i] |= (byte)(inputBuf[j++] - 0x57); 55 else if ((‘F‘ >= inputBuf[j]) && (inputBuf[j] >= ‘A‘)) outBuf[i] |= (byte)(inputBuf[j++] - 0x37); 56 else throw new Exception("ERROR: Format incorrect."); 57 } 58 /// aes cryption 59 aes.IV = new byte[16]; 60 aes.Key = new byte[] { 0x1F, 0x54, 0x52, 0x6A, 0x73, 0x93, 0x58, 0x9E, 0x4B, 0xCF, 0xFB, 0xAE, 0xFC, 0x97, 0x59, 0x3E }; 61 //aes.Mode = CipherMode.CBC; 62 aes.Padding = PaddingMode.None; 63 var cryptoTransform = aes.CreateEncryptor(); 64 byte[] resultBuff = cryptoTransform.TransformFinalBlock(outBuf, 0, outBuf.Length); 65 Console.WriteLine("Encoding: "); 66 foreach (byte i in resultBuff) 67 Console.Write("{0:X2}", i); 68 Console.WriteLine(); 69 Console.WriteLine("Decoding:"); 70 cryptoTransform = aes.CreateDecryptor(); 71 resultBuff = cryptoTransform.TransformFinalBlock(resultBuff, 0, resultBuff.Length); 72 foreach (byte i in resultBuff) 73 Console.Write("{0:X2}", i); 74 Console.WriteLine(); 75 } 76 } 77 catch (Exception ex) 78 { 79 Console.WriteLine(ex.Message); 80 } 81 } 82 } 83 } 84 }
编译运行:
至此，我们已经基本掌握了AES加密算法。从下一章开始，我们将开始着手设计由接收有外设备通过串口发送过来的序列号，并对这些序列号进行加密，最后再通过串口发送给外设备。
End.
谢谢.