kxd8Py3T

1package EorD;
2
3import java.util.Scanner;
4import java.util.Random;
5
6public class encryptDecrypt 
7{
8public static char crypt(char input, int random, boolean encrypt) 
9{
10    assert random > 0 && random <= 95 : "Valid random number is in range 1 - 95";
11
12    int character = (int) input;
13
14    if (input < 32 || input > 127) {
15        return input;
16    }
17
18    int value = (encrypt) ? (character - 32 + random + 96) : (character - 32 - random + 96);
19
20    return (char)(value % 96 + 32);
21}
22
23public static void encrypt() 
24{
25	Scanner scanner = new Scanner(System.in);
26	System.out.println("What sentence would you like to encrypt?");
27	String sentence = scanner.nextLine();
28	char[] secretMessage;
29	secretMessage = sentence.toCharArray();
30	char[] code = new char[sentence.length()];
31	int[] key = new int[sentence.length()];
32    for (int i = 0; i < sentence.length(); i++) 
33    {
34    	
35    	int keyCode = generator.nextInt(96);
36    	key[i] = keyCode;
37        char encryption = crypt((char)secretMessage[i], keyCode, true);
38        code[i] = encryption;   
39    }
40    hiddenMessage = code;
41    secretKey = key;
42    String codes = new String(code);
43    System.out.println("the code is: " + codes);
44    System.out.println();
45    scanner.close();
46}
47public static void decrypt()
48{
49	System.out.println("what message would you like to decrypt?");
50	Scanner scanner = new Scanner(System.in);
51	String sentence = scanner.nextLine();
52	hiddenMessage = sentence.toCharArray();
53	char[] message = new char[sentence.length()];
54	int[] key = new int[sentence.length()];
55	 for (int i=0; i< sentence.length(); i++)
56	    {
57		 int keyCode = generator.nextInt(96);
58		key[i] = keyCode;
59	    char decryption = crypt(hiddenMessage[i], key[i], false);
60	    message[i] = decryption;
61	    }
62	    System.out.print("Your secret message was: "); 
63	    System.out.println(message);
64	    scanner.close();
65}
66
67public static void main(String args[]) 
68{
69	Scanner scanner = new Scanner(System.in);
70	System.out.println("Would you like to encrypt or decrypt?");
71	String sentence = scanner.nextLine();
72	if(sentence.matches("encrypt"))
73	{
74	encrypt();
75	}
76	else if(sentence.matches("decrypt"))
77	{
78	decrypt();
79	}
80	else
81	{
82		System.out.println("This is not a valid option");
83	}
84	scanner.close();
85}
86
87static Random generator=new Random(4711);
88static int[] secretKey;
89static char[] hiddenMessage;
90}