Key hash for Android-Facebook app

0 votes
asked Dec 8, 2010 by ravi-babu

I'm working on an Android app, in which I want to integrate a Facebook posting feature. I downloaded the Facebook-Android SDK, and I got the readme.md (text file) in there, in which it is mentioned to generate the key hash for Android. How do I generate it?

27 Answers

0 votes
answered Jan 14, 2010 by abhinav

1) Create a key to sign your application, and remember the alias.

2) Install OpenSSL.

3) Put the bin folder of OpenSSL in your path.

4) Follow the steps mentioned under "Setup Single Sign-On" on the FB-Android-SDK page, and generate your Hash Key. Make sure you put the correct alias and keystore file name.

5) Create an application on Facebok, and under Mobile Devices tab, enter this Hash Key.

0 votes
answered Jan 26, 2011 by hossaindoula

You need to create a keystore by the keytool for signed apps for android like the procedure described in Android Site and then you have to install cygwin and then you need to install openssl from google code then just execute the following command and you will get the hash key for android and then put that hash key into the facebook application you created. And then you can access the facebook application through the Android Application for posting wall ("publish_stream") could be an example.

$ keytool -exportcert -alias alias_name -keystore sample_keystore.keystore | openssl sha1 -binary | openssl base64

You need to execute the above command from cygwin.

0 votes
answered Dec 12, 2011 by avi-c

Here are the steps-

  1. Download openssl from Google code (If you have a 64 bit machine you must download openssl-0.9.8e X64 not the latest version)

  2. Extract it. create a folder- OpenSSL in C:/ and copy the extracted code here.

  3. detect debug.keystore file path. If u didn't find, then do a search in C:/ and use the Path in the command in next step.

  4. detect your keytool.exe path and go to that dir/ in command prompt and run this command in 1 line-

    $ keytool -exportcert -alias androiddebugkey -keystore "C:\Documents and Settings\Administrator.android\debug.keystore" | "C:\OpenSSL\bin\openssl" sha1 -binary |"C:\OpenSSL\bin\openssl" base64

    • it will ask for password, put android
    • that's all. u will get a key-hash

For more info visit here

0 votes
answered Dec 27, 2011 by bryan-bedard

The instructions currently in Facebook's Android Tutorial do not work well under Windows. Their example shows how to pipe the keytool output to openssl but if you try this under Windows the output is not valid for some reason. I found that I had to use intermediary files to get it to work properly. Here are the steps that worked for me:

Start by downloading openssl for Windows from Google.

C:\Users\Me>keytool -exportcert -alias my_key -keystore my.keystore -storepass PASSWORD > mycert.bin

C:\Users\Me>openssl sha1 -binary mycert.bin > sha1.bin

C:\Users\Me>openssl base64 -in sha1.bin -out base64.txt

After running these commands the valid hash is stored in the file base64.txt. Copy and paste this to your app settings on Facebook.

0 votes
answered Jan 15, 2012 by noelyahan

To get the Android key hash code, follow these steps:

  1. Download OpenSSL for Windows here
  2. Now unzip to the C drive
  3. Open a CMD prompt
  4. Type cd C:\Program Files\Java\jdk1.6.0_26\bin
  5. Then type only keytool -export -alias myAlias -keystore C:\Users\your user name\.android\myKeyStore | C:\openssl-0.9.8k_WIN32\bin\openssl sha1 -binary | C:\openssl-0.9.8k_WIN32\bin\openssl enc -a -e
  6. Done
0 votes
answered Jan 24, 2012 by ron

The simplest solution I have found is this:

  • Open up Log Cat
  • Try and access Facebook with the Android SDK
  • Look for the line in the log that looks like this:

    04-24 01:14:08.605: I/System.out(31395): invalid_key:Android key mismatch. 
    Your key "abcdefgHIJKLMN+OPqrstuvwzyz" does not match the allowed keys specified in your
    application settings. Check your application settings at 
    http://www.facebook.com/developers
    
  • Copy "abcdefgHIJKLMN+OPqrstuvwzyz" and paste it into the Facebook Android Key Hash area.

0 votes
answered Dec 7, 2012 by bassem-samy

Dude, you can copy this code to any activity. It will log in the catlog the hash key which is the debug key. This is easy, and it's a relief than using SSL and so ;)

PackageInfo info;
try {
    info = getPackageManager().getPackageInfo("com.you.name", PackageManager.GET_SIGNATURES);
    for (Signature signature : info.signatures) {
        MessageDigest md;
        md = MessageDigest.getInstance("SHA");
        md.update(signature.toByteArray());
        String something = new String(Base64.encode(md.digest(), 0));
        //String something = new String(Base64.encodeBytes(md.digest()));
        Log.e("hash key", something);
    }
} catch (NameNotFoundException e1) {
    Log.e("name not found", e1.toString());
} catch (NoSuchAlgorithmException e) {
    Log.e("no such an algorithm", e.toString());
} catch (Exception e) {
    Log.e("exception", e.toString());
}

You can delete the code after knowing the key ;)

0 votes
answered Dec 19, 2012 by deltacap

This is what is given at the official page of Facebook:

   keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64

Let me break this command into fragments.

  1. Look for "keytool.exe". You can search that on the C: drive. You can find it in "java jdk" or "java jre". If you have installed multiple versions, choose any.

  2. Open a CMD prompt and go to the above directory where you found "keytool.exe".

    Clip the "exe`" and paste the above command provided on the Facebook page.

  3. You will get an error on entering this that OpenSSL is not recognized as in input output command. Solution : Download "Openssl" from OpenSSL (if you have a 64-bit machine you must download openssl-0.9.8e X64). Extract and save it anywhere... I saved it on the C: drive in the OpenSSl folder

  4. Replace the openssl in the above command in which you was getting an error of OpenSSL with "C:\OpenSSL\bin\openssl" at both the places after the pipe, "|".

  5. If prompted for a password, enter android.

And you will get your hash key. For further steps, refer again to the Facebook page.

0 votes
answered Jan 3, 2013 by anil-bhatiya
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import android.os.Bundle;
import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;
import android.text.Editable;
import android.util.Base64;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

    Button btn;
    EditText et;
    PackageInfo info;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn=(Button)findViewById(R.id.button1);
        et=(EditText)findViewById(R.id.editText1);
        btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub

                try {
                    info = getPackageManager().getPackageInfo("com.example.id", PackageManager.GET_SIGNATURES);
                    for (Signature signature : info.signatures) {
                        MessageDigest md;
                        md = MessageDigest.getInstance("SHA");
                        md.update(signature.toByteArray());
                        String something = new String(Base64.encode(md.digest(), 0));
                        //String something = new String(Base64.encodeBytes(md.digest()));
                        et.setText("" + something);
                        Log.e("hash key", something);
                    }
                } catch (NameNotFoundException e1) {
                    Log.e("name not found", e1.toString());
                } catch (NoSuchAlgorithmException e) {
                    Log.e("no such an algorithm", e.toString());
                } catch (Exception e) {
                    Log.e("exception", e.toString());
                }
            }
        });
    }



}
0 votes
answered Jan 7, 2013 by biraj-zalavadia

For Linux

Open Terminal :

For Debug Build

keytool -exportcert -alias androiddebugkey -keystore debug.keystore | openssl sha1 -binary | openssl base64

you wil find debug.keystore from ".android" folder copy it from and paste on desktop and run above command

For release Build

keytool -exportcert -alias <aliasName> -keystore <keystoreFilePath> | openssl sha1 -binary | openssl base64

NOTE : Make sure In Both case it must ask for password. If it does not asks for password that means something is wrong in command.

Welcome to Q&A, where you can ask questions and receive answers from other members of the community.
Website Online Counter

...