xAT0i1CC

1private String prompt = "Enter message to encode:";  
2private String message = "";
3private String encryptionKey = "";
4private String decryptionKey = "";
5private String encryptedMessage = "";
6private String decryptedMessage = "";
7private int progress = 0;
8
9public void setup()
10{
11  size(400, 400); 
12  textAlign(CENTER);
13}
14
15public void draw()
16{
17  background(255);
18  noStroke();
19  fill(0);
20  
21  text(prompt, width / 2, 20);
22  text(message, width / 2, 40);
23  
24  if (progress > 0)
25  {
26    text("Enter a secret key to encode your message:", width / 2, 60);
27    text(encryptionKey, width / 2, 80);
28  }
29  
30  if (progress > 1)
31  {
32    text("Your encrypted message:", width / 2 , 100);
33    fill(255, 0, 0);
34    text(encryptedMessage, width / 2, 120);
35    
36    fill(0);
37    text("Enter a secret key to decode your message:", width / 2 , 140);
38    text(decryptionKey, width / 2, 160);
39  }
40  
41  if (progress > 2)
42  {
43    text("Your decrypted message:", width / 2 , 180);
44    fill(0, 255, 0);
45    text(decryptedMessage, width / 2, 200);
46  }
47}
48
49public void keyPressed()
50{
51  if (keyCode == BACKSPACE && !message.isEmpty())
52  {
53    if (progress == 0)
54    {
55      message = message.substring(0, message.length() - 1);
56    }
57    else if (progress == 1)
58    {
59      encryptionKey = encryptionKey.substring(0, encryptionKey.length() - 1);
60    }
61    else if (progress == 2)
62    {
63      decryptionKey = decryptionKey.substring(0, decryptionKey.length() - 1);
64    }
65  }
66  else if (keyCode == ENTER)
67  {
68    if (progress == 1)
69    {
70      int k = Integer.parseInt(encryptionKey);  
71      encryptedMessage = encrypt(message, k);
72    }
73    else if (progress == 2)
74    {
75      int k = Integer.parseInt(decryptionKey);  
76      decryptedMessage = decrypt(encryptedMessage, k);
77    }
78    
79    progress++;
80  }
81  else if (keyCode != SHIFT && keyCode != CONTROL && keyCode != ALT)
82  {
83    if (progress == 0)
84    {
85      message += key;
86    }
87    else if (progress == 1)
88    {
89      encryptionKey += key; 
90    }
91    else if (progress == 2)
92    {
93      decryptionKey += key; 
94    }
95  }
96}
97
98public String encrypt(String message, int secretKey)
99{
100  String out = "";
101  
102  // TODO: Implement encryption algorithm
103  
104  return out;
105}
106
107public String decrypt(String message, int secretKey)
108{
109  String out = "";
110  
111  // TODO: Implement decryption algorithm
112  
113  return out;
114}