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1package com.who2sell.utils;
2
3import java.io.UnsupportedEncodingException;
4import java.security.InvalidAlgorithmParameterException;
5import java.security.InvalidKeyException;
6import java.security.NoSuchAlgorithmException;
7import java.security.spec.InvalidKeySpecException;
8import java.security.spec.KeySpec;
9
10import javax.crypto.BadPaddingException;
11import javax.crypto.Cipher;
12import javax.crypto.IllegalBlockSizeException;
13import javax.crypto.NoSuchPaddingException;
14import javax.crypto.SecretKey;
15import javax.crypto.SecretKeyFactory;
16import javax.crypto.spec.IvParameterSpec;
17import javax.crypto.spec.PBEKeySpec;
18import javax.crypto.spec.SecretKeySpec;
19
20import org.apache.tomcat.util.buf.HexUtils;
21
22/**
23 * Util Class helps to encrypt and decrypt data based on AES 256 bit based
24 * encryption
25 * 
26 * @author Abhishek
27 *
28 */
29public class AESEncryptionUtil {
30
31	private static final String password = "thisispipechimpsmailypassword99";
32	private static final String ivStr = "807ba7ddeab2b8ea6af5e6e7eff13911";
33	private static final byte[] salt = new byte[] { (byte) 0xA9, (byte) 0x9B, (byte) 0xC8, (byte) 0x32, (byte) 0x56,
34			(byte) 0x35, (byte) 0xE3, (byte) 0x03 };
35
36	private static SecretKey secret;
37	public static void main(String[] args) throws Exception {
38		
39		secret = getKey();
40		String enc = encrypt("vishal@patel");
41		String plain = decrypt(enc);
42		System.out.println(enc + plain);
43	}
44	
45	private static SecretKey getKey() throws NoSuchAlgorithmException, InvalidKeySpecException {
46		
47		SecretKeyFactory factory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
48		KeySpec spec = new PBEKeySpec(password.toCharArray(), salt, 65536, 256);
49		SecretKey tmp = factory.generateSecret(spec);
50		return new SecretKeySpec(tmp.getEncoded(), "AES");
51	}
52
53	/** Encrypts the plain text data **/
54	public static String encrypt(String plainText) throws NoSuchAlgorithmException, InvalidKeySpecException,
55			NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException,
56			BadPaddingException, UnsupportedEncodingException {
57
58		// SecretKey secret = getKey();
59		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
60		byte[] iv = HexUtils.fromHexString(ivStr);
61		cipher.init(Cipher.ENCRYPT_MODE, secret, new IvParameterSpec(iv));
62		byte[] plainData = "Hello, World!".getBytes("UTF-8");
63		byte[] encryptedText = cipher.doFinal(plainData);
64		return new String(encryptedText, "UTF-8");
65	}
66
67	/** Decrypts to plain text data from Encrypted one **/
68	public static String decrypt(String encryptedText) throws NoSuchAlgorithmException, InvalidKeySpecException,
69			NoSuchPaddingException, InvalidKeyException, InvalidAlgorithmParameterException, IllegalBlockSizeException,
70			BadPaddingException, UnsupportedEncodingException {
71		
72		// SecretKey secret = getKey();
73		Cipher cipher2 = Cipher.getInstance("AES/CBC/PKCS5Padding");
74		byte[] iv = HexUtils.fromHexString(ivStr);
75		cipher2.init(Cipher.DECRYPT_MODE, secret, new IvParameterSpec(iv));
76		byte[] encData = cipher2.doFinal(encryptedText.getBytes("UTF-8"));
77		String plainText = new String(encData, "UTF-8");
78		return plainText;
79	}
80}