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ByteDream 2020-09-03 20:25:39 +00:00 committed by GitHub
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src/org/blueshard/cryptogx/SecureDelete.java
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package org.bytedream.cryptogx;
import java.io.*;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Random;
import java.util.TreeSet;
/**
* <p>Class for secure delete files<p/>
*
* @since 1.2.0
*/
public class SecureDelete {
public static void deleteDirectory(String directory, int iterations, byte[] buffer) throws IOException {
TreeSet<File> directories = new TreeSet<>();
Files.walk(Paths.get(directory)).map(Path::toFile).forEach(directoryFile -> {
if (directoryFile.isDirectory()) {
directories.add(directoryFile);
} else {
try {
SecureDelete.deleteFile(directoryFile, iterations, buffer);
} catch (IOException e) {
e.printStackTrace();
}
while (directoryFile.exists()) {
if (directoryFile.delete()) {
break;
}
}
}
});
File deleteDirectory = directories.last();
while (deleteDirectory != null) {
deleteDirectory.delete();
while (deleteDirectory.delete()) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
deleteDirectory = directories.lower(deleteDirectory);
}
}
/**
* <p>Overwrites the file {@param iterations} times line by line with random bytes (minimal size {@param minFileSize}; maximal size {@param maxFileSize}) and delete it</p>
*
* @param file that should be deleted
* @param iterations how many times the file should be overwritten before it gets deleted
* @return if the file could be deleted
* @throws IOException
*
* @since 1.12.0
*/
public static void deleteFile(File file, int iterations, byte[] buffer) throws IOException {
SecureRandom secureRandom = new SecureRandom();
RandomAccessFile raf = new RandomAccessFile(file, "rws");
for (int i=0; i<iterations; i++) {
long length = file.length();
raf.seek(0);
raf.getFilePointer();
int pos = 0;
while (pos < length) {
secureRandom.nextBytes(buffer);
raf.write(buffer);
pos += buffer.length;
}
}
raf.close();
while (file.delete()) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}