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EncMain.java
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EncMain.java
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import java.util.Arrays;
import java.util.Scanner;
import java.io.*;
/**
* Created by Ameenur Rahman, Vishnu Rudhva and Denesh raj.
* This Encryption is a set of simple methods which is used to encrypt, passing data from one method to another till end in a random manner.
*/
// This method is to validate Encryption Algorithms
public class EncMain {
private static Scanner sc = new Scanner(System.in);
private static BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); // Input Reader
public static void main(String args[]) {
int[] order = {1, 2, 3, 4, 5, 6, 7}; // Random Order
int[] keys = {10, 20, 10, 10, 10, 10, 10}; // Random Keys
boolean quit = false;
String result, test;
System.out.printf("Do you want to test(Y or n): ");
try {
test = br.readLine();
if(test.equalsIgnoreCase("y")) {
quit = true;
}
} catch(Exception e) {
e.printStackTrace();
}
// Test Here.
if(quit) {
int len = getInputArrayLength();
int[] TestOrder = {1, 2, 3, 4};
int[] Keys = {10, 20, 10, 10};
float[] encChars = getInputArray(len), EncryptedChars;
float[] DecryptedChars;
EncryptedChars = Encrypt(encChars, TestOrder, Keys);
DecryptedChars = DecryptFloatRet(EncryptedChars, TestOrder, Keys);
printArray(EncryptedChars, "Encrypted Array");
printArray(DecryptedChars, "Decrypted Array");
}
// If not testing.
while(!quit) {
System.out.println("Enter the options to perform your operation: ");
System.out.println("\t1. Encryption");
System.out.println("\t2. Decryption");
System.out.println("\t3. Exit");
System.out.printf("Enter your Option: ");
int option = sc.nextInt();
breakLine();
switch(option) {
case 1:
System.out.println("Enter the options for Encryption!");
System.out.println("\t1. To Encrypt a String");
System.out.println("\t2. To Encrypt a File");
System.out.println("\t3. Exit");
System.out.printf("Enter your Option: ");
option = sc.nextInt();
breakLine();
switch(option) {
case 1:
result = getEncryptedString(order, keys);
System.out.println("Encrypted String: " + result);
break;
case 2:
encryptFile(order, keys);
break;
case 3:
quit = true;
break;
default:
System.out.println("Please Enter the Valid Option!");
break;
}
break;
case 2:
System.out.println("Enter the options for Decryption!");
System.out.println("\t1. To Decrypt a String");
System.out.println("\t2. To Decrypt a File");
System.out.println("\t3. Exit");
System.out.printf("Enter your Option: ");
option = sc.nextInt();
breakLine();
switch(option) {
case 1:
result = getDecryptedString(order, keys);
System.out.println("Decrypted String: " + result);
break;
case 2:
decryptFile(order, keys);
break;
case 3:
quit = true;
break;
default:
System.out.println("Please Enter the Valid Option!");
break;
}
break;
case 3:
quit = true;
break;
default:
System.out.println("Please Enter the Valid Option!");
break;
}
}
try {
br.close();
} catch(IOException e) {
e.printStackTrace();
}
sc.close(); //Closing the Scanner
}
// Method to break new line
public static void breakLine() { System.out.println(); }
// This will get the String to Encrypt
public static String getInputString(String msg) {
String unEncryptedString = "";
System.out.printf("Enter the " + msg + ": ");
try {
unEncryptedString = br.readLine();
} catch(IOException e) {
e.printStackTrace();
System.exit(0);
}
System.out.println(msg + ": " + unEncryptedString);
return unEncryptedString;
}
// Getting the Length of the Array
public static int getInputArrayLength() {
int length; // Length of the Chars Array
System.out.printf("Enter the Length of the Array: ");
length = sc.nextInt();
return length;
}
// Gets the Input Array
public static float[] getInputArray(int length) {
float[] chars = new float[length];
// Getting the Input Array from the User
for(int i = 0; i < length; i++) {
System.out.printf("Array[" + (i + 1) + "]: ");
chars[i] = (float) sc.nextInt();
}
return chars;
}
// Encrypts the String on fly as per user's request
public static String getEncryptedString(int[] order, int[] keys) {
String chars;
float[] EncryptedString;
chars = getInputString("String to Encrypt");
EncryptedString = Encrypt(chars, order, keys);
return convertToString(EncryptedString);
}
// Decrypts the String as the User Requested
public static String getDecryptedString(int[] order, int[] keys) {
String EncryptedString = getInputString("String to Decrypt");
return Decrypt(EncryptedString, order, keys);
}
// Encrypts a String
public static float[] Encrypt(String UnEncryptedString, int[] order, int[] keys) {
float[] chars, CharsToEncrypt, EncryptedChars; // To hold the Array of numbers for Encryption
// Encryption
chars = convertToNum(UnEncryptedString);
CharsToEncrypt = CloneArray(chars);
EncryptedChars = encryptedArray(CharsToEncrypt, order, keys);
return EncryptedChars;
}
// Encrypts a String with float array.
public static float[] Encrypt(float[] chars, int[] order, int[] keys) {
float[] CharsToEncrypt, EncryptedChars; // To hold the Array of numbers for Encryption
// Encryption
CharsToEncrypt = CloneArray(chars);
EncryptedChars = encryptedArray(CharsToEncrypt, order, keys);
return EncryptedChars;
}
// Decrypts the Encrypted String
public static String Decrypt(String EncryptedString, int[] order, int[] keys) {
float[] EncryptedChars, DecryptedChars, CharsToDecrypt; // To hold the Array of numbers for Encryption
EncryptedChars = convertToNum(EncryptedString);
CharsToDecrypt = CloneArray(EncryptedChars);
DecryptedChars = decryptedArray(CharsToDecrypt, order, keys);
return convertToString(DecryptedChars);
}
// Overriding for the Decryption for which float array is given.
public static String Decrypt(float[] EncryptedChars, int[] order, int[] keys) {
float[] DecryptedChars, CharsToDecrypt; // To hold the Array of numbers for Encryption
CharsToDecrypt = CloneArray(EncryptedChars);
DecryptedChars = decryptedArray(CharsToDecrypt, order, keys);
return convertToString(DecryptedChars);
}
// Overriding for the Decryption for which float array is given.
public static float[] DecryptFloatRet(float[] EncryptedChars, int[] order, int[] keys) {
float[] CharsToDecrypt; // To hold the Array of numbers for Encryption
CharsToDecrypt = CloneArray(EncryptedChars);
return decryptedArray(CharsToDecrypt, order, keys);
}
// Checking Each and Every Methods in Encryption Class
public static float[] encryptedArray(float[] chars, int[] order, int[] keys) {
Encryption enc = new Encryption(chars);
try {
enc.Encrypt(order, keys);
} catch(Exception e) {
System.out.println("Error while Encrypting: " + e.getMessage());
System.exit(0);
}
float[] EncChars = enc.getChars();
return EncChars;
}
// Checking Each and Every Methods in Decryption Class
public static float[] decryptedArray(float[] chars, int[] order, int[] keys) {
Decryption dec = new Decryption(chars);
try {
dec.Decrypt(order, keys);
} catch(Exception e) {
System.out.println("Error while Decrypting: " + e.getMessage());
System.exit(0);
}
float[] DecChars = dec.getChars();
return DecChars;
}
// Printing the Result of the Array
public static void printArray(float[] chars, String msg) {
int len = chars.length;
System.out.printf(msg + ": ");
for(int i = 0; i < len - 1; i++) {
System.out.printf(chars[i] + " ");
}
System.out.println(chars[len - 1]);
}
// Printing the Result of the Array Without msg
public static void printArray(float[] chars) {
int len = chars.length;
for(int i = 0; i < len - 1; i++) {
System.out.printf(chars[i] + " ");
}
System.out.println(chars[len - 1]);
}
// Clone the Given Array
public static float[] CloneArray(float[] array) {
int len = array.length;
float[] ClonedArray = new float[len];
for(int i = 0; i < len; i++) { ClonedArray[i] = array[i]; }
return ClonedArray;
}
// Convert Given String to array
public static float[] convertToNum(String Text) {
int len = Text.length(), AsciiChar;
float[] ReturnArray = new float[len];
for(int i = 0; i < len; i++) {
AsciiChar = Text.charAt(i);
ReturnArray[i] = (float) AsciiChar;
}
return ReturnArray;
}
// Convert Given array to String
public static String convertToString(float[] DecryptedArray) {
int len = DecryptedArray.length;
String ReturnString = "";
char c;
int num;
for(int i = 0; i < len; i++) {
num = (int) DecryptedArray[i];
c = (char) num;
ReturnString += c;
}
return ReturnString;
}
// Encrypts the File
public static void encryptFile(int[] order, int[] keys) {
String line = null;
boolean flag = false;
System.out.print("Enter the Name of the File to Encrypt: ");
try {
String FileName = br.readLine();
String EncryptedString = "";
String buffer = "";
File file = new File(FileName);
Scanner FileScan = new Scanner(file);
FileScan.useDelimiter(" ");
while(FileScan.hasNext()) {
line = FileScan.next();
if(buffer.length() != 0) {
line = buffer + line;
buffer = "";
} else {
if(line.length() == 1) {
buffer = line + " ";
continue;
}
}
float[] EncStr = Encrypt(line, order, keys);
if(!flag) {
EncryptedString = EncryptedString + Arrays.toString(EncStr);
flag = true;
} else {
EncryptedString = EncryptedString + "\n" + Arrays.toString(EncStr);
}
System.out.println("\t" + EncStr);
}
BufferedWriter out = new BufferedWriter(new FileWriter(FileName));
out.write(EncryptedString + "\n");
System.out.println("File Encrypted Successfully!");
breakLine();
out.close();
FileScan.close();
} catch(FileNotFoundException e) {
System.out.println("Please Enter the Correct File Name! " + e.getMessage());
} catch(IOException e) {
System.out.println("Error in Reading the File! " + e.getMessage());
e.printStackTrace();
} catch(Exception e) {
e.printStackTrace();
}
}
// Decrypts the File
public static void decryptFile(int[] order, int[] keys) {
System.out.print("Enter the Name of the Encrypted File to Decrypt: ");
String line = null;
try {
String FileName = br.readLine();
String DecryptedString = "";
File file = new File(FileName);
Scanner FileScan = new Scanner(new FileReader(file));
while(FileScan.hasNext()) {
line = FileScan.nextLine();
float[] parsedLine = getArrayFromString(line);
String DecStr = Decrypt(parsedLine, order, keys);
DecryptedString += DecStr + " ";
}
System.out.printf("Enter the Output File to write to: ");
String file2 = br.readLine();
File File2 = new File(file2);
BufferedWriter out = new BufferedWriter(new FileWriter(File2));
out.write(DecryptedString);
System.out.println("File Decrypted Successfully!");
breakLine();
out.close();
FileScan.close();
} catch(FileNotFoundException e) {
System.out.println("Please Enter the Correct File Name! " + e.getMessage());
} catch(IOException e) {
System.out.println("Error in Reading the File! " + e.getMessage());
e.printStackTrace();
} catch(Exception e) {
e.printStackTrace();
}
}
// Converts the Arrays.toString() output to an Array.
private static float[] getArrayFromString(String string) {
String[] strings = string.replace("[", "").replace("]", "").split(", ");
float result[] = new float[strings.length];
for (int i = 0; i < result.length; i++) {
result[i] = Float.parseFloat(strings[i]);
}
return result;
}
}