Ak8qfedr

1package sample.files;
2import javax.crypto.Cipher;
3import javax.crypto.KeyGenerator;
4import javax.crypto.SecretKey;
5import java.io.File;
6import java.io.FileInputStream;
7import java.io.FileOutputStream;
8import java.io.IOException;
9import java.nio.file.Files;
10import java.nio.file.Path;
11import java.nio.file.Paths;
12import java.security.SecureRandom;
13import java.util.List;
14import java.util.stream.Collectors;
15
16public abstract class FileUtils {
17
18private static final String UsedAlgorithm = "RC4";
19
20 public static void decrypt(File crypt, String out, String password, String extraExtensions, OnProcess onProcess) throws Exception{
21
22        String cryptName = crypt.getName();
23        String filename = cryptName.replace(".dec","");
24
25        FileInputStream fis = new FileInputStream(crypt);
26
27
28        // create a binary key from the argument key (seed)
29        SecureRandom sr = new SecureRandom(password.getBytes());
30        KeyGenerator kg = KeyGenerator.getInstance(UsedAlgorithm);
31        kg.init(sr);
32        SecretKey sk = kg.generateKey();
33
34        // do the decryption with that key
35        Cipher cipher = Cipher.getInstance(UsedAlgorithm);
36        cipher.init(Cipher.DECRYPT_MODE, sk);
37
38        StringBuilder path = new StringBuilder(out + filename);
39
40            if (extraExtensions.startsWith("."))
41                 path.append(extraExtensions);
42            else
43                path.append(".").append(extraExtensions);
44
45
46
47        FileOutputStream fos = new FileOutputStream(path.toString());
48
49        byte[] in = new byte[64];
50        int read;
51
52        long processed = 0;
53
54        while ((read = fis.read(in)) != -1) {
55            byte[] output = cipher.update(in, 0, read);
56            if (output != null)
57                fos.write(output);
58
59            processed += in.length;
60
61            if (processed < crypt.length())
62                onProcess.run((int) (processed * 100 / crypt.length()));
63        }
64
65        byte[] output = cipher.doFinal();
66        if (output != null){
67            fos.write(output);
68            onProcess.run(100);
69        }
70
71        fis.close();
72        fos.flush();
73        fos.close();
74    }
75
76public static void encrypt(File in, String out, String password, OnProcess onProcess, boolean removeExtensions) throws Exception {
77        String filename;
78        if (removeExtensions)
79            filename = in.getName().substring(0, in.getName().lastIndexOf("."));
80
81        else
82            filename = in.getName();
83
84        String cryptName = filename + ".dec";
85
86        FileInputStream inFile = new FileInputStream(in);
87        FileOutputStream outFile = new FileOutputStream(new File(out +cryptName));
88
89
90        // create a binary key from the argument key (seed)
91        SecureRandom sr = new SecureRandom(password.getBytes());
92        KeyGenerator kg = KeyGenerator.getInstance(UsedAlgorithm);
93        kg.init(sr);
94        SecretKey sk = kg.generateKey();
95
96        // create an instance of cipher
97        Cipher cipher = Cipher.getInstance(UsedAlgorithm);
98
99        // initialize the cipher with the key
100        cipher.init(Cipher.ENCRYPT_MODE, sk);
101
102
103        byte[] buffer = new byte[64];
104
105        long processed = 0;
106
107        int bytesRead;
108        while ((bytesRead = inFile.read(buffer)) != -1) {
109            byte[] output = cipher.update(buffer, 0, bytesRead);
110            if (output != null) {
111                outFile.write(output);
112
113                processed += buffer.length;
114
115                if (processed < in.length())
116                    onProcess.run((int) (processed * 100 / in.length()));
117            }
118        }
119
120        byte[] output = cipher.doFinal();
121        if (output != null) {
122            outFile.write(output);
123            onProcess.run(100);
124        }
125        inFile.close();
126        outFile.flush();
127        outFile.close();
128    }
129
130
131
132  public interface OnProcess {
133     void run(int progress);
134  }
135}