GarncsBK

1import java.io.InputStream;
2import java.io.OutputStream;
3import java.io.FileInputStream;
4import java.io.FileOutputStream;
5import java.io.ObjectOutputStream;
6import java.io.ObjectInputStream;
7
8import javax.crypto.Cipher;
9import javax.crypto.SecretKey;
10import javax.crypto.spec.IvParameterSpec;
11import javax.crypto.CipherInputStream;
12import javax.crypto.CipherOutputStream;
13import javax.crypto.KeyGenerator;
14
15import java.security.spec.AlgorithmParameterSpec;
16
17public class AESEncrypter
18{
19        Cipher ecipher;
20        Cipher dcipher;
21
22        public AESEncrypter(SecretKey key)
23        {
24                byte[] iv = new byte[]
25                {
26                        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f
27                };
28
29                AlgorithmParameterSpec paramSpec = new IvParameterSpec(iv);
30                try
31                {
32                        ecipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
33                        dcipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
34
35                        ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
36                        dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
37                }
38                catch (Exception e)
39                {
40                        e.printStackTrace();
41                }
42        }
43
44        byte[] buf = new byte[1024];
45
46        public void encrypt(InputStream in, OutputStream out)
47        {
48                try
49                {
50                        out = new CipherOutputStream(out, ecipher);
51
52                        int numRead = 0;
53                        while ((numRead = in.read(buf)) >= 0)
54                        {
55                                out.write(buf, 0, numRead);
56                        }
57                        out.close();
58                }
59                catch (java.io.IOException e)
60                {
61                }
62        }
63
64        public void decrypt(InputStream in, OutputStream out)
65        {
66                try
67                {
68
69                        in = new CipherInputStream(in, dcipher);
70
71                        int numRead = 0;
72                        while ((numRead = in.read(buf)) >= 0)
73                        {
74                                out.write(buf, 0, numRead);
75                        }
76                        out.close();
77                }
78                catch (java.io.IOException e)
79                {
80                }
81        }
82
83        public static void main(String args[])
84        {
85                try
86                {
87                        // Generate a temporary key. In practice, you would save this key.
88                        // See also e464 Encrypting with DES Using a Pass Phrase.
89
90                        KeyGenerator    kgen    =       KeyGenerator.getInstance("AES");
91                        kgen.init(256);
92                        SecretKey key                   =       kgen.generateKey();
93
94                        // Create encrypter/decrypter class
95                        AESEncrypter encrypter = new AESEncrypter(key);
96
97                        // Encrypt
98                        //encrypter.encrypt(new FileInputStream("DESTest.txt"),new FileOutputStream("Encrypted.txt"));
99                        // Decrypt
100                        encrypter.decrypt(new FileInputStream("settings.lua"),new FileOutputStream("Decrypted.txt"));
101                }
102                catch (Exception e)
103                {
104                        e.printStackTrace();
105                }
106        }
107}