Z9UfXhbN

1import java.security.NoSuchAlgorithmException;
2
3import javax.crypto.Cipher;
4import javax.crypto.NoSuchPaddingException;
5import javax.crypto.spec.IvParameterSpec;
6import javax.crypto.spec.SecretKeySpec;
7
8//https://github.com/serpro/Android-PHP-Encrypt-Decrypt
9
10public class MCrypt
11{
12
13    static char[] HEX_CHARS = {'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};
14
15    private String iv = "1234567890abcdef";
16    private String SecretKey = "abcdef1234567890";
17
18    private IvParameterSpec ivspec;
19    private SecretKeySpec keyspec;
20    private Cipher cipher;
21
22    public MCrypt()
23    {
24        ivspec = new IvParameterSpec(iv.getBytes());
25        keyspec = new SecretKeySpec(SecretKey.getBytes(), "AES");
26
27        try
28        {
29            cipher = Cipher.getInstance("AES/CBC/NoPadding");
30        }
31        catch (NoSuchAlgorithmException e)
32        {
33            //e.printStackTrace();
34        }
35        catch (NoSuchPaddingException e)
36        {
37            //e.printStackTrace();
38        }
39    }
40
41    public byte[] encrypt(String text) throws Exception
42    {
43        if(text == null || text.length() == 0)
44            throw new Exception("Empty string");
45
46        byte[] encrypted = null;
47
48        try
49        {
50            cipher.init(Cipher.ENCRYPT_MODE, keyspec, ivspec);
51            encrypted = cipher.doFinal(padString(text).getBytes());
52        }
53        catch (Exception e)
54        {
55            throw new Exception("[encrypt] " + e.getMessage());
56        }
57
58        return encrypted;
59    }
60
61    public byte[] decrypt(String code) throws Exception
62    {
63        if(code == null || code.length() == 0)
64            throw new Exception("Empty string");
65
66        byte[] decrypted = null;
67
68        try
69        {
70            cipher.init(Cipher.DECRYPT_MODE, keyspec, ivspec);
71            decrypted = cipher.doFinal(hexToBytes(code));
72
73            //Remove trailing zeroes
74            if( decrypted.length > 0)
75            {
76                int trim = 0;
77                for( int i = decrypted.length - 1; i >= 0; i-- ) if( decrypted[i] == 0 ) trim++;
78
79                if( trim > 0 )
80                {
81                    byte[] newArray = new byte[decrypted.length - trim];
82                    System.arraycopy(decrypted, 0, newArray, 0, decrypted.length - trim);
83                    decrypted = newArray;
84                }
85            }
86        }
87        catch (Exception e)
88        {
89            throw new Exception("[decrypt] " + e.getMessage());
90        }
91        return decrypted;
92    }
93
94
95    public static String bytesToHex(byte[] buf)
96    {
97        char[] chars = new char[2 * buf.length];
98        for (int i = 0; i < buf.length; ++i)
99        {
100            chars[2 * i] = HEX_CHARS[(buf[i] & 0xF0) >>> 4];
101            chars[2 * i + 1] = HEX_CHARS[buf[i] & 0x0F];
102        }
103        return new String(chars);
104    }
105
106
107    public static byte[] hexToBytes(String str)
108    {
109        if (str==null)
110        {
111            return null;
112        }
113        else if (str.length() < 2)
114        {
115            return null;
116        }
117        else
118        {
119            int len = str.length() / 2;
120            byte[] buffer = new byte[len];
121            for (int i=0; i<len; i++)
122            {
123                buffer[i] = (byte) Integer.parseInt(str.substring(i*2,i*2+2),16);
124            }
125            return buffer;
126        }
127    }
128
129    private static String padString(String source)
130    {
131        char paddingChar = 0;
132        int size = 16;
133        int x = source.length() % size;
134        int padLength = size - x;
135
136        for (int i = 0; i < padLength; i++)
137        {
138            source += paddingChar;
139        }
140
141        return source;
142    }
143
144}