QZB2cBnm

1public  class Cifrar {
2
3// Definición del tipo de algoritmo a utilizar (AES, DES, RSA)
4private final static String alg = "AES";
5private final static int keyLength=128;
6private final static int ivLength=128;
7
8// Definición del modo de cifrado a utilizar
9private final static String cI =  "AES/CBC/PKCS5Padding";
10
11
12
13// Aqui generamos la clave aleatoria AES
14public static byte [] ClaveAleatoria() throws Exception {
15        //Generamos la clave aleatoria.
16        KeyGenerator keyGen = KeyGenerator.getInstance(alg);
17        keyGen.init(keyLength, new SecureRandom());
18        SecretKey aesKey = keyGen.generateKey();
19        byte[] aesKeyBytes = aesKey.getEncoded();
20        return aesKeyBytes;
21
22}
23
24
25
26       public static  byte[] VectorInicialAleatorio() throws Exception {   
27        byte [] iv = SecureRandom.getSeed(ivLength/8);
28        return iv;
29
30     }
31
32
33
34
35
36public static byte[] encrypt( byte [] aesKeyBytes, byte[]  iv , String cleartext) throws Exception {
37        Cipher cipher = Cipher.getInstance(cI);
38        //SecretKeySpec skeySpec = new SecretKeySpec(aesKeyBytes.getBytes(), alg);
39        SecretKeySpec skeySpec = new SecretKeySpec(aesKeyBytes, alg);
40        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
41        //System.out.println(ivParameterSpec);
42        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, ivParameterSpec);
43        byte[] encrypted = cipher.doFinal(cleartext.getBytes());
44        //return new String(encodeBase64(encrypted));
45        //return new String(Base64.encode(encrypted));
46        return encrypted;
47}
48
49
50
51
52
53
54
55     //AQUI ESTA EL PROBLEMAA- PARECE QUE LE FALTAN BYTES
56
57    public static String decrypt(byte [] aesKeyBytes, byte[]  iv, byte[] encrypted) throws Exception {
58        Cipher cipher = Cipher.getInstance(cI);
59        SecretKeySpec skeySpec = new SecretKeySpec(aesKeyBytes, alg);
60        IvParameterSpec ivParameterSpec = new IvParameterSpec(iv);
61        //byte[] enc = Base64.encode(encrypted);
62        System.out.println(encrypted+"aqui despues viene el fallo");
63        //byte[] enc = Base64.decode(encrypted);
64
65        cipher.init(Cipher.DECRYPT_MODE, skeySpec, ivParameterSpec);
66        //byte[] decrypted = cipher.doFinal(enc);
67        byte[] decrypted = cipher.doFinal(encrypted);
68        return new String(decrypted);
69}
70
71 }
72	
73public class main {
74
75     public static void main(String[] args) throws Exception {
76
77     String cleartext = "hola";
78
79    byte[] textocifrado= 
80
81
82
83 crypto.Cifrar.encrypt(crypto.Cifrar.ClaveAleatoria(),crypto.Cifrar.VectorInicialAleatorio(),cleartext);
84
85   System.out.println("Texto encriptado: "+textocifrado);
86   System.out.println("Texto desencriptado: "+crypto.Cifrar.decrypt(crypto.Cifrar.ClaveAleatoria(),crypto.Cifrar.VectorInicialAleatorio(),textocifrado));
87	
88Texto encriptado: ����ߏ�Ϻ��Qθ�
89Exception in thread "main" javax.crypto.BadPaddingException: Given final block not properly padded
90����ߏ�Ϻ��Qθ�aqui despues viene el fallo
91    at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:811)
92    at com.sun.crypto.provider.CipherCore.doFinal(CipherCore.java:676)
93    at com.sun.crypto.provider.AESCipher.engineDoFinal(AESCipher.java:313)
94    at javax.crypto.Cipher.doFinal(Cipher.java:2087)
95    at crypto.Cifrar.decrypt(Cifrar.java:129)
96    at crypto.main.main(main.java:24)
97C:UsersJurparkAppDataLocalNetBeansCache8.1executor-snippetsrun.xml:53: Java returned: 1
98BUILD FAILED (total time: 1 second)
99	
100new String("hola".getBytes()); // te devuelve un nuevo String con el texto "hola".
101	
102crypto.Cifrar.encrypt(
103    crypto.Cifrar.ClaveAleatoria(),
104    crypto.Cifrar.VectorInicialAleatorio(),
105    cleartext);
106
107crypto.Cifrar.decrypt(
108    crypto.Cifrar.ClaveAleatoria(),
109    crypto.Cifrar.VectorInicialAleatorio(),
110    textocifrado))