Geek asks and answers

Encrypt and decrypt ArrayList <String>

I need to save a list of string arrays in a file, encrypting it. And then I decrypt the contents of the file and restore it to the list of arrays. But when I decrypt the content, it stores "Null" blocks. Without the "Null" blocks, the rest of the text matches the encoding i.

public static void encryptFile(List<String> moduleList, File fileOut) {
    try {
        OutputStream out = new FileOutputStream(fileOut);
        out = new CipherOutputStream(out, encryptCipher);
        StringBuilder moduleSet = new StringBuilder();
        for (String module : moduleList) {
            moduleSet.append(module + "#");
        }
        out.write(moduleSet.toString().getBytes(Charset.forName("UTF-8")));
        out.flush();
        out.close();
    } catch (java.io.IOException ex) {
        System.out.println("Exception: " + ex.getMessage());
    }
}

public static List<String> decryptFile(File fileIn) {
    List<String> moduleList = new ArrayList<String>();
    byte[] buf = new byte[16];

    try {
        InputStream in = new FileInputStream(fileIn);
        in = new CipherInputStream(in, decryptCipher);

        int numRead = 0;
        int counter = 0;
        StringBuilder moduleSet = new StringBuilder();
        while ((numRead = in.read(buf)) >= 0) {
            counter++;
            moduleSet.append(new String(buf));
        }

        String[] blocks = moduleSet.split("#");
        System.out.println("Items: " + blocks.length);

    } catch (java.io.IOException ex) {
        System.out.println("Exception: " + ex.getMessage());
    }
    return moduleList;
}

I tried with UTF-16 since the strings are encoded in java in UTF-16, but that only makes the output worse. Your suggestions will be appreciated ... Thanks

+5
source share
1 answer

I would snatch the code in which you convert the contents of the list to and from a string and replace it with ObjectOutputStream :

FileOutputStream out1 = new FileOutputStream(fileOut);
CipherOutputStream out2 = new CipherOutputStream(out1, encryptCipher);
ObjectOutputStream out3 = new ObjectOutputStream(out2);
out3.writeObject(moduleList);

Then to read:

FileInputStream in1 = new FileInputStream(fileIn);
CipherInputStream in2 = new CipherInputStream(in1, decryptCipher);
ObjectInputStream in3 = new ObjectInputStream(in2);
moduleList = (Set<String>)in3.readObject()
+4
source

More articles:


All Articles