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1package lb.themike10452.ocrn00b;
2
3import android.content.Context;
4
5import java.io.ByteArrayOutputStream;
6import java.io.IOException;
7import java.io.InputStream;
8import java.lang.ref.WeakReference;
9import java.security.InvalidKeyException;
10import java.security.NoSuchAlgorithmException;
11import java.security.spec.InvalidKeySpecException;
12
13import javax.crypto.Cipher;
14import javax.crypto.CipherInputStream;
15import javax.crypto.NoSuchPaddingException;
16import javax.crypto.SecretKey;
17import javax.crypto.SecretKeyFactory;
18import javax.crypto.spec.DESKeySpec;
19
20public final class AssetLoader {
21
22    private static final String DesKey = "!@#$%^&a";
23
24    private WeakReference<Context> mContextRef;
25
26    public AssetLoader(WeakReference<Context> contextRef) {
27        this.mContextRef = contextRef;
28    }
29
30    public String LoadAssetString(String name) throws IOException {
31        byte[] data = LoadAssetBytes(name);
32        if (data != null) {
33            return new String(data);
34        } else {
35            return null;
36        }
37    }
38
39    public byte[] LoadAssetBytes(String name) throws IOException {
40        InputStream is = null;
41        CipherInputStream cis = null;
42
43        try {
44            is = mContextRef.get().getAssets().open(name);
45            Cipher des = Cipher.getInstance("DES");
46            DESKeySpec dks = new DESKeySpec(DesKey.getBytes());
47            SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
48            SecretKey desKey = skf.generateSecret(dks);
49
50            des.init(Cipher.DECRYPT_MODE, desKey);
51
52            cis = new CipherInputStream(is, des);
53            ByteArrayOutputStream baos = new ByteArrayOutputStream();
54
55            int size = 4096;
56            byte[] buffer = new byte[size];
57            int read;
58            while ((read = cis.read(buffer, 0, size)) != -1) {
59              baos.write(buffer, 0, read);
60            }
61
62            baos.flush();
63
64            return baos.toByteArray();
65        } catch (NoSuchAlgorithmException | NoSuchPaddingException | InvalidKeyException | InvalidKeySpecException e) {
66            // do nothing
67            return null;
68        } finally {
69            if (cis != null) {
70                cis.close();
71            }
72
73            if (is != null) {
74                is.close();
75            }
76        }
77    }
78}