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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.  
  11. 	static String encrypt(String key) {
  12. 		String encrypHexa = "";
  13. 		try (Scanner x = new Scanner("new new new new" + System.lineSeparator() + "old old old old");) {
  14. 			int keyItr = 0;
  15. 			while (x.hasNext()) {
  16. 				String a = x.nextLine();
  17.  
  18. 				if (x.hasNext()) {
  19. 					a += System.lineSeparator();
  20. 				}
  21.  
  22. 				for (int i = 0; i < a.length(); i++) {
  23. 					// XOR
  24. 					int temp = a.charAt(i) ^ key.charAt(keyItr);
  25.  
  26. 					encrypHexa += String.format("%02x", (byte) temp);
  27. 					keyItr++;
  28. 					if (keyItr == key.length()) {
  29. 						keyItr = 0;
  30. 					}
  31. 				}
  32. 			}
  33. 		}
  34. 		System.out.println("Encrypted is: " + encrypHexa);
  35. 		return encrypHexa;
  36. 	}
  37.  
  38. 	static void decrypt(String f, String key) {
  39. 		String hexiToDeci = "";
  40. 		String decrypText = "";
  41. 		try (Scanner x = new Scanner(f)) {
  42. 			while (x.hasNext()) {
  43.  
  44. 				String a = x.nextLine();
  45.  
  46. 				for (int i = 0; i < a.length() - 1; i += 2) {
  47.  
  48. 					String output = a.substring(i, i + 2);
  49.  
  50. 					int decimal = Integer.parseInt(output, 16);
  51.  
  52. 					hexiToDeci += (char) decimal;
  53.  
  54. 				}
  55. 				// Decrypt with XOR
  56. 				int keyItr = 0;
  57. 				for (int i = 0; i < hexiToDeci.length(); i++) {
  58. 					// XOR
  59. 					int temp = hexiToDeci.charAt(i) ^ key.charAt(keyItr);
  60. 					decrypText += (char) temp;
  61. 					keyItr++;
  62. 					if (keyItr == key.length()) {
  63. 						keyItr = 0;
  64. 					}
  65. 				}
  66. 			}
  67. 		}
  68. 		System.out.println("Decrypted is: " + decrypText);
  69. 	}
  70.  
  71. 	public static void main (String[] args) throws java.lang.Exception
  72. 	{
  73. 		String key = "Qwertyuiop[123$4$567]";
  74. 		String x = encrypt(key);
  75. 		decrypt(x, key);
  76. 	}
  77. }
Success #stdin #stdout 0.07s 2184192KB
comments (?)
stdin 
Standard input is empty
stdout 
Encrypted is: 3f1212521a1c024901152c115c56533e4b595217323d13451d181d55060314
Decrypted is: new new new new
old old old old
https://ideone.com/gZZoZ5
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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