How to generate a Aho-Corasick hash

Question

I have recently started developing an open source anti virus software, although the hashes are generated with the Aho-Corasick algorithm.

I would love to know how to generate Aho-Corasick hashes from executables, as I have found barely any information on the internet regarding this

Answer 1

In Java:

private static String readFile(String path) throws IOException {
  FileInputStream stream = new FileInputStream(new File(path));
  try {
    FileChannel fc = stream.getChannel();
    MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, fc.size());
    /* Instead of using default, pass in a decoder. */
    return Charset.defaultCharset().decode(bb).toString();
  }
  finally {
    stream.close();
  }
}

Then you can use, following to get MD5 hash

byte[] bytesOfMessage = readFile("filepath").getBytes("UTF-8");
MessageDigest md = MessageDigest.getInstance("MD5");
String thedigest = Arrays.toString[md.digest(bytesOfMessage)];