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1import java.io.UnsupportedEncodingException;
2import java.security.MessageDigest;
3import java.security.NoSuchAlgorithmException;
4import java.util.Arrays;
5import java.util.Base64;
6
7import javax.crypto.Cipher;
8import javax.crypto.spec.SecretKeySpec;
9
10/**
11 * Ejemplo para aes
12 * 
13 * @author Camilo Contreras - Banco Consorcio
14 *
15 */
16public class AES {
17
18	/***********************************************/
19	public static void main(String[] args) {
20		final String secretKey = "9`<S3 0G92l22>5dHL\"x26|90160I@S#0'94}y!m(2464208aSEy2Ln1499ay*3^09\\5~mNn47P4)4^ :GJ42-C2q193S4qZ1c,58ZKfImHQ70z$074K0{5SdZP*OA4v";
21
22		String originalString = "howtodoinjava.com";
23		System.out.println("Original: " + originalString);
24
25		String encryptedString = AES.encrypt(originalString, secretKey);
26		System.out.println("Encriptado: " + encryptedString);
27
28		String decryptedString = AES.decrypt(encryptedString, secretKey);
29		System.out.println("Desencriptado: " + decryptedString);
30
31	}
32
33	/***********************************************/
34
35	private static SecretKeySpec secretKey;
36	private static byte[] key;
37
38	/**
39	 * Setear key
40	 * 
41	 * @param myKey
42	 */
43	public static void setKey(String myKey) {
44		MessageDigest sha = null;
45		try {
46			key = myKey.getBytes("UTF-8");
47			sha = MessageDigest.getInstance("SHA-1");
48			key = sha.digest(key);
49			key = Arrays.copyOf(key, 16);
50			secretKey = new SecretKeySpec(key, "AES");
51		} catch (NoSuchAlgorithmException e) {
52			e.printStackTrace();
53		} catch (UnsupportedEncodingException e) {
54			e.printStackTrace();
55		}
56	}
57
58	/**
59	 * Encriptar
60	 * 
61	 * @param strToEncrypt
62	 * @param secret
63	 * @return
64	 */
65	public static String encrypt(String strToEncrypt, String secret) {
66		try {
67			setKey(secret);
68			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
69			cipher.init(Cipher.ENCRYPT_MODE, secretKey);
70			return Base64.getEncoder().encodeToString(cipher.doFinal(strToEncrypt.getBytes("UTF-8")));
71		} catch (Exception e) {
72			System.out.println("Error while encrypting: " + e.toString());
73		}
74		return null;
75	}
76
77	/**
78	 * Desencriptar
79	 * 
80	 * @param strToDecrypt
81	 * @param secret
82	 * @return
83	 */
84	public static String decrypt(String strToDecrypt, String secret) {
85		try {
86			setKey(secret);
87			Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5PADDING");
88			cipher.init(Cipher.DECRYPT_MODE, secretKey);
89			return new String(cipher.doFinal(Base64.getDecoder().decode(strToDecrypt)));
90		} catch (Exception e) {
91			System.out.println("Error while decrypting: " + e.toString());
92		}
93		return null;
94	}
95}