Download from URL and MD5 check : MD5.xml « Security « Android

1. Android
2. Security
3. MD5.xml

Download from URL and MD5 check

 

//package com.IsraelPack;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.math.BigInteger;
import java.net.URL;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import android.util.Log;

public class Utils {
  public static boolean DownloadFromUrl(String url, String fileName) {
    try {
      BufferedInputStream in = new BufferedInputStream(new URL(url)
          .openStream());
      FileOutputStream fos = new FileOutputStream(fileName);
      BufferedOutputStream bout = new BufferedOutputStream(fos, 1024);
      byte[] data = new byte[1024];
      int x = 0;
      while ((x = in.read(data, 0, 1024)) >= 0) {
        bout.write(data, 0, x);
      }
      bout.close();
      in.close();
    } catch (IOException e) {
      Log.e("IsraelPack", e.getMessage());
      return false;
    }
    return true;
  }

  public static boolean checkMD5(String md5, String fileName) {
    if (md5 == null || md5 == "" || fileName == null) {
      return false;
    }
    String calculatedDigest = calculateMD5(fileName);
    if (calculatedDigest == null) {
      return false;
    }
    return calculatedDigest.equalsIgnoreCase(md5);
  }

  public static String calculateMD5(String fileName) {
    File updateFile = new File(fileName);
    MessageDigest digest = null;
    try {
      digest = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
      return null;
    }
    InputStream is = null;
    try {
      is = new FileInputStream(updateFile);
    } catch (FileNotFoundException e) {
      return null;
    }
    byte[] buffer = new byte[8192];
    int read = 0;
    try {
      while ((read = is.read(buffer)) > 0) {
        digest.update(buffer, 0, read);
      }
      byte[] md5sum = digest.digest();
      BigInteger bigInt = new BigInteger(1, md5sum);
      String output = bigInt.toString(16);
      // Fill to 32 chars
      output = String.format("%32s", output).replace(' ', '0');
      return output;
    } catch (IOException e) {
      throw new RuntimeException("Unable to process file for MD5", e);
    } finally {
      try {
        is.close();
      } catch (IOException e) {
        throw new RuntimeException(
            "Unable to close input stream for MD5 calculation", e);
      }
    }
  }

  public static String readFileAsString(String filePath) {
    try {
      StringBuffer fileData = new StringBuffer(1000);
      BufferedReader reader;

      reader = new BufferedReader(new FileReader(filePath));
      char[] buf = new char[1024];
      int numRead = 0;
      while ((numRead = reader.read(buf)) != -1) {
        String readData = String.valueOf(buf, 0, numRead);
        fileData.append(readData);
        buf = new char[1024];
      }
      reader.close();
      return fileData.toString();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }
    return null;
  }
}

   
  

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