mainActivity/src/com/example/furt/myapplication/MD5.java

   1 package com.example.furt.myapplication;
   2
   3 import android.os.Environment;
   4
   5 import java.io.FileInputStream;
   6 import java.io.InputStream;
   7 import java.security.MessageDigest;
   8
   9
  10 public class MD5 {
  11
  12     MD5(){}
  13
  14     public static String digest(String filePath) {
  15         InputStream inputStream = null;
  16         try {
  17             inputStream = new FileInputStream(Environment.getExternalStorageDirectory()+"/tesiEs/"+filePath);
  18             byte[] buffer = new byte[1024];
  19             MessageDigest digest = MessageDigest.getInstance("MD5");
  20             int numRead = 0;
  21             while (numRead != -1) {
  22                 numRead = inputStream.read(buffer);
  23                 if (numRead > 0)
  24                     digest.update(buffer, 0, numRead);
  25             }
  26             byte [] md5Bytes = digest.digest();
  27             return convertHashToString(md5Bytes);
  28         } catch (Exception e) {
  29             return null;
  30         } finally {
  31             if (inputStream != null) {
  32                 try {
  33                     inputStream.close();
  34                 } catch (Exception e) { }
  35             }
  36         }
  37     }
  38
  39     private static String convertHashToString(byte[] md5Bytes) {
  40         String returnVal = "";
  41         for (int i = 0; i < md5Bytes.length; i++) {
  42             returnVal += Integer.toString(( md5Bytes[i] & 0xff ) + 0x100, 16).substring(1);
  43         }
  44         return returnVal;
  45     }
  46 }