Pwa8sGeU

1private final byte[] key;
2
3private static final String ALGORITHM = "AES";
4
5public AES_Algorithm(byte[] key)
6{
7    this.key = key;
8}
9
10/**
11 * Encrypts the given plain text
12 *
13 * @param plainText The plain text to encrypt
14 * @return 
15 * @throws java.lang.Exception 
16 */
17public byte[] encrypt(byte[] plainText) throws Exception
18{
19    SecretKeySpec secretKey = new SecretKeySpec(key, ALGORITHM);
20    Cipher cipher = Cipher.getInstance(ALGORITHM);
21    cipher.init(Cipher.ENCRYPT_MODE, secretKey);
22
23    return cipher.doFinal(plainText);
24}
25
26/**
27 * Decrypts the given byte array
28 *
29 * @param cipherText The data to decrypt
30 * @return 
31 * @throws java.lang.Exception
32 */
33public byte[] decrypt(byte[] cipherText) throws Exception
34{
35    SecretKeySpec secretKey = new SecretKeySpec(key, ALGORITHM);
36    Cipher cipher = Cipher.getInstance(ALGORITHM);
37    cipher.init(Cipher.DECRYPT_MODE, secretKey);
38
39    return cipher.doFinal(cipherText);
40}
41
42  public static String toBinary( byte[] bytes )
43{
44    StringBuilder sb = new StringBuilder(bytes.length * Byte.SIZE);
45    for( int i = 0; i < Byte.SIZE * bytes.length; i++ )
46        sb.append((bytes[i / Byte.SIZE] << i % Byte.SIZE & 0x80) == 0 ? '0' : '1');
47    return sb.toString();
48}
49
50public static void main(String[] args) throws Exception
51{
52     BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
53
54     System.out.println("Enter your input text");
55    String input_text=br.readLine();
56
57    System.out.println("Enter your key");
58    String key_plaintext=br.readLine();
59
60
61    byte[] plainText = input_text.getBytes(StandardCharsets.UTF_8);
62    byte[] encryptionKey = key_plaintext.getBytes(StandardCharsets.UTF_8);
63
64    AES_Algorithm aes = new AES_Algorithm(encryptionKey);
65    byte[] cipherText = aes.encrypt(plainText);
66    System.out.println("your cipher in ascii = "+new String(cipherText));
67    System.out.println("encrypted string HEX: " + DatatypeConverter.printHexBinary(cipherText));
68    System.out.println("encrypted string Binary: " + toBinary(cipherText));
69
70    ////////////////////////////////
71
72    Scanner scan = new Scanner(System.in);
73     System.out.print("Enter your ciphertext in Binary :");
74    String ciphertext=scan.next();
75
76    //input type hex
77    //byte[] cipher_hex = DatatypeConverter.parseHexBinary(ciphertext);
78
79    //input type binary
80    byte[] cipher_binary = new BigInteger(ciphertext.trim(), 2).toByteArray();
81
82    String resulted = DatatypeConverter.printHexBinary(cipher_binary).trim(); //trim hilangkan 00
83
84    System.out.println("Your ciphertext in Hex : "+resulted.trim());
85
86    System.out.println("Enter your key :");
87    String key_ciphertext=br.readLine();
88
89    byte[] decription_key = key_ciphertext.getBytes(StandardCharsets.UTF_8);
90
91    AES_Algorithm aes_dec = new AES_Algorithm(decription_key);
92
93    byte[] decryptedCipherText = aes_dec.decrypt(cipher_binary);
94
95    System.out.println("Your Decrypted text = "+new String(decryptedCipherText));
96
97}