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Main.java
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Main.java
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/**
* @version 1.0
* @author github.com/Attupatil
* @since 2020-10-19T07:09:54Z
* @updated_at: "2020-11-12T13:19:28Z",
* @pushed_at: "2020-11-12T13:19:26Z",
* @git_url: "git://github.com/Attupatil/DataSecurityEncryptDecrypt.git",
* @ssh_url: "[email protected]:Attupatil/DataSecurityEncryptDecrypt.git",
* @clone_url: "https://github.com/Attupatil/DataSecurityEncryptDecrypt.git",
* @svn_url: "https://github.com/Attupatil/DataSecurityEncryptDecrypt",
*/
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
import java.io.PrintWriter;
public class Main {
public static void main(String[] args) {
String algorithm = "unicode";
String mode = "enc";
String data = "";
String source = null;
String output = null;
int key = 0;
for (int i = 0; i < args.length - 1; i++) {
switch(args[i]) {
case "-mode":
if (args[i+1].toLowerCase().equals("dec")) {
mode = "dec";
}
break;
case "-alg":
if (args[i+1].toLowerCase().equals("shift")){
algorithm = "shift";
}
break;
case "-key":
try {
key = Integer.parseInt(args[i+1]);
} catch (NumberFormatException e) {
key = 0;
}
break;
case "-data":
data = args[i+1];
break;
case "-in":
source = args[i+1];
break;
case "-out":
output = args[i+1];
break;
}
if (source != null) {
data = inputFromFile(source);
}
}
String message1 = mode;
String message = data;
String message2 = output;
if (message1.startsWith("enc") && algorithm.startsWith("unicode")){
System.out.println(displayResult(caesarEncrypt(message, key),output));
}
else if(message1.startsWith("dec") && algorithm.startsWith("unicode")){
System.out.println(displayResult(caesarDecrypt(message, key),output));
}
else if(message1.startsWith("dec") && algorithm.startsWith("shift")){
System.out.println(displayResult(Shiftenc(message, key),output));
}
else if(message1.startsWith("enc") && algorithm.startsWith("shift")){
System.out.println(displayResult(Shiftdec(message, key),output));
}
}
public static String caesarEncrypt(String str, int key) {
StringBuilder encoded = new StringBuilder();
for (char c : str.toCharArray()) {
char newChar = (char) (c + key );
encoded.append(newChar);
}
encoded.append("\n");
return encoded.toString();
}
public static String caesarDecrypt(String str, int key) {
StringBuilder decoded = new StringBuilder();
for (char c : str.toCharArray()) {
char newChar = (char) (c - key );
decoded.append(newChar);
}
decoded.append("\n");
return decoded.toString();
}
public static String inputFromFile(String url) {
File file = new File(url);
try (Scanner scanner = new Scanner(file)) {
return scanner.nextLine();
} catch (FileNotFoundException e) {
return "Error! Try again, Reason :- File not found!";
}
}
public static String outputToFile(String data, String url) {
File file = new File(url);
try (PrintWriter writer = new PrintWriter(file)) {
writer.print(data);
return file.getAbsolutePath();
} catch (FileNotFoundException e) {
return "Error! Try again, Reason:- Cannot write to file!" + e.getMessage();
}
}
public static String displayResult(String data, String output) {
if (output == null) {
return data;
} else {
return outputToFile(data, output);
}
}
public static String Shiftenc(String data, int key){
String result = "";
for (int character : data.toCharArray()) {
if (character >= 65 && character <= 90) {
if (character + key > 90) {
result += (char) (Math.abs(character + key - 90) + 64);
} else {
result += (char) (character + key);
}
} else if (character >= 97 && character <= 122) {
if (character + key >= 122) {
result += (char) (Math.abs(character + key - 122) + 96);
} else {
result += (char) (character + key);
}
} else {
result += (char) character;
}
}
return result;
}
public static String Shiftdec(String data, int key){
String result = "";
for (int character : data.toCharArray()) {
if (character >= 65 && character <= 90) {
if (character - key < 65) {
result += (char) (90 + (character - 64 - key));
} else {
result += (char) (character - key);
}
} else if (character >= 97 && character <= 122) {
if (character - key < 97) {
result += (char) (122 + (character - 96 - key));
} else {
result += (char) (character - key);
}
} else {
result += (char) character;
}
}
return result;
}
}