-
Notifications
You must be signed in to change notification settings - Fork 0
/
vigenereEncrypt.java
89 lines (78 loc) · 3.22 KB
/
vigenereEncrypt.java
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
/*
Name: Vincent Hael
Student ID: 2583
Course: Applied Cryptography
Teacher: Dr. Khoshavi
*/
package com.company;
import java.util.ArrayList;
public class Project1CodeHaelVincent {
public static ArrayList repeatedKeyList(int[] key, int[] message) {
int counter = 0;
int keyLength = key.length;
ArrayList<Integer> repeatedKey = new ArrayList<>();
for (int i = 0; i < message.length; i++) {
//check for spaces
if (message[i] == -33) {
repeatedKey.add(-33);
}
// check for repeat key
else if (message[i] == -19) {
repeatedKey.add(-19);
} else {
repeatedKey.add(key[counter % keyLength]);
counter++;
}
}
return repeatedKey;
}
public static void execute(String message, String key) {
//Turning the message into a collection of ASCII values in an array
int messageArray[] = new int[message.length()];
for (int i = 0; i < messageArray.length; i++) {
messageArray[i] = message.charAt(i) - 65; //assign the integer value of character.
//NOTE - 65 is ASCII value of A, -33 is the ASCII Value of space - 65.
}
//Turning the key into a collection of ASCII values in an array
int keyArray[] = new int[key.length()];
for (int i = 0; i < keyArray.length; i++) {
keyArray[i] = key.charAt(i) - 65; //assign the integer value of character.
//NOTE - 65 is ASCII value of A, -33 is the ASCII Value of space - 65.
}
//Repeating the key
int counter = 0;
ArrayList<Integer> keyArrayList = repeatedKeyList(keyArray, messageArray);
//Encrypting Procedure
int cryptArray[] = new int[message.length()];
for (int i = 0; i < cryptArray.length; i++) {
cryptArray[i] = (messageArray[i] + keyArrayList.get(i)) % 26;
}
//Decrypting the message to english
System.out.println("\nThe encrypted message of each message is: ");
String decryptMessage = " ";
for (int i = 0; i < cryptArray.length; i++) {
cryptArray[i] = cryptArray[i] + 65;
if (cryptArray[i] == 51) //Resulted value of ASCII + 65
{
decryptMessage += " ";
} else if (cryptArray[i] == 53) //Resulted value of ASCII + 65
{
decryptMessage += ".";
} else {
decryptMessage += String.valueOf((char) cryptArray[i]);
}
}
System.out.println("\n" + decryptMessage);
}
public static void main(String[] args) {
//Prompting the user for message and key
System.out.print("Welcome to the Vigenere Encrypter.\n");
String stressTest1 = "A HEALTHY ATTITUDE IS CONTAGIOUS BUT DONT WAIT TO CATCH IT FROM OTHERS.";
String stressTest2 = "IF YOU CARRY YOUR CHILDHOOD WITH YOU YOU NEVER BECOME OLDER.";
String stressTest3 = "FROM PRINCIPLES IS DERIVED PROBABILITY BUT TRUTH OR CERTAINTY IS OBTAINED ONLY FROM FACTS.";
String key = "KHOSHAVI";
execute(stressTest1, key);
execute(stressTest2, key);
execute(stressTest3, key);
}
}