Md5 sum : MD5.xml « Security « Android

1. Android
2. Security
3. MD5.xml

Md5 sum

 
//com.pommedeterresautee.twoborange.System;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.math.BigInteger;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import android.util.Log;

public class Md5sum {

  private static final String TAG = "MD5";

  public static boolean checkMD5(String md5, File updateFile) {
    if (md5 == null || md5.equals("") || updateFile == null) {
      Log.e(TAG, "md5 String NULL or UpdateFile NULL");
      return false;
    }

    String calculatedDigest = calculateMD5(updateFile);

    if (calculatedDigest == null) {
      Log.e(TAG, "calculatedDigest NULL");
      return false;
    }

    Log.i(TAG, "Calculated digest: " + calculatedDigest);
    Log.i(TAG, "Provided digest: " + md5);

    return calculatedDigest.equalsIgnoreCase(md5);
  }

  public static String calculateMD5(File updateFile) {
    MessageDigest digest;
    try {
      digest = MessageDigest.getInstance("MD5");
    } catch (NoSuchAlgorithmException e) {
      Log.e(TAG, "Exception while getting Digest", e);
      return null;
    }
    InputStream is;
    try {
      is = new FileInputStream(updateFile);
    } catch (FileNotFoundException e) {
      Log.e(TAG, "Exception while getting FileInputStream", e);
      return null;
    }
    byte[] buffer = new byte[8192];
    int read;
    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) {
        Log.e(TAG, "Exception on closing MD5 input stream", e);
      }
    }
  }

  public static String getRecoveryMD5() {
    String MD5string = "";
    String recoveryFilename = "/dev/mtd/mtd1";
    try {
      Process p = Runtime.getRuntime().exec("su");
      OutputStream os = p.getOutputStream();
      os.write(("md5sum " + recoveryFilename).getBytes());
      os.flush();
      os.close();
      InputStream is = p.getInputStream();
      BufferedReader br = new BufferedReader(new InputStreamReader(is));
      String str = br.readLine();
      MD5string = str.split("  ")[0].trim();
      is.close();
      br.close();
      p.destroy();
    } catch (Exception e) {
      Log.e(TAG, "Exception on getting Recovery MD5", e);
      return null;
    }
    Log.i(TAG, "Recovery MD5: " + MD5string);
    return MD5string;
  }
}

   
  

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