Key hash for Android-Facebook app

Question

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?

Answer 1

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

Answer 2

[EDIT 2020]-> Now I totally recommend the answer here, way easier using android studio, faster and no need to write any code - the one below was back in the eclipse days :) -.

You can use this code in any activity. It will log the hashkey in the logcat, which is the debug key. This is easy, and it's a relief than using SSL.

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 ;)

Answer 3

I've created a small tool for Windows and Mac OS X. Just throw in the key-store file, and get the hash key.

If you want the default debug.keystore file, use the default alias and password. Else, use your own keystore file and values.

Check it out, download the Windows version or download the Mac OS X version (Dev-Host might be down sometimes... so if the link is broken, PM me and I'll fix it).

I hope that help you guys...

Dec 31, 2014 - EDIT: Changed host to AFH. Please let me know if the links are broken

Nov 21, 2013 - EDIT:

As users requested, I added a default keystore location and a DONATE button. Feel free to use it if I've helped you. :)

Answer 4

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.

Answer 5

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.

Answer 6

You can get key hash from SHA-1 key. Its very simple you need to get your SHA-1(Signed APK) key from Play Store check below image.

Now Copy that SHA-1 key and past it in this website http://tomeko.net also check below image to get your Key Hash.

Answer 7

Add this code to onCreate of your activity, it will print the hash under the KeyHash tag in your logCat

try {
    PackageInfo info = getPackageManager().getPackageInfo(
                           getPackageName(),
                           PackageManager.GET_SIGNATURES);
    for (Signature signature : info.signatures) {
        MessageDigest md = MessageDigest.getInstance("SHA");
        md.update(signature.toByteArray());
        Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
    }
}
catch (NameNotFoundException e) {

}
catch (NoSuchAlgorithmException e) {

}

You can add multiple hashkeys for your account, so if you been running in debug don't forget to run this again in release mode.

Answer 8

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

Answer 9

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.

Answer 10

I have done by this way for Linux OS & Windows OS:

Linux:

• Download Openssl
• Open terminal
• keytool -exportcert -alias **myaliasname** -keystore **/home/comp-1/Desktop/mykeystore.jks** | openssl sha1 -binary | openssl base64

Kindly change Alias Name and Keystore with it's path as your requirement.

Terminal would ask for Password of Keystore. You have to provide password for the same Keystore.

So finally you would get the Release Hashkey.

Windows:

Steps for Release Hashkey:

• Download Openssl (Download from here), I have downloaded for 64 bit OS, you can find more here
• Extract downloaded zip file to C:\ drive only
• Open command prompt
• keytool -exportcert -alias **myaliasname** -keystore **"C:\Users\hiren.patel\Desktop\mykeystore.jks"** | "C:\openssl-0.9.8e_X64\bin\openssl.exe" sha1 -binary | "C:\openssl-0.9.8e_X64\bin\openssl.exe" base64

Kindly change Alias Name and Keystore with it's path as your requirement.

Note:

Please put your details where I have marked between ** **.

Terminal would ask for Password of Keystore. You have to provide password for the same Keystore.

So finally you would get the Release Hashkey.

Done

Answer 11

• download openSSL for windows in here you can find 64bit and 32bit here

• extract the downloaded file

• create folder name openSSL in C drive
• copy all the extracted items in to openSSL folder (bin,include,lib,openssl.cnf)
• get android debug keystore, default location will be

C:\Users\username\.android\debug.keystore

• now get your command prompt and paste this code

keytool -exportcert -alias androiddebugkey -keystore C:\Users\username.android\debug.keystore | "C:\openSSL\bin\openssl" sha1 -binary | "C:\openSSL\bin\openssl" base64

• hit enter and you will get the 28 digit keycode

Answer 12

Download openSSL -> Install it -> it would usually install in C:\OpenSSL

then open cmd and type

cd../../Program Files (Enter)

java (Enter)

dir (Enter)

cd jdk1.6.0_17 (varies with jdk versions) (Enter)

to check jdk version go to C:/program files/java/jdk_version

cd bin (enter)

keytool -exportcert -alias androiddebugkey -keystore C:Users\Shalini\.android\debug.keystore | "C:\OpenSSL\bin\openssl sha1 -binary | "C:\OpenSSL\bin\openssl base64 (Enter)

It will ask you for password which is android.

Answer 13

1. Simply Open you Main Activity File and create below mention function:

        try {
       PackageInfo info = getPackageManager().getPackageInfo(
               "your.application.package.name",
               PackageManager.GET_SIGNATURES);
       for (Signature signature : info.signatures) {
           MessageDigest md = MessageDigest.getInstance("SHA");
           md.update(signature.toByteArray());
           Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
       }
   } catch (PackageManager.NameNotFoundException e) {
   
   } catch (NoSuchAlgorithmException e) {
    }
   

1.1 Run you Application, this will generate a Hash key for your application.

2. Now, Open log cat and search with "KeyHash" and copy the hash key.

3. One you generate the Hash key you can remove this function.

Answer 14

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.

Answer 15

Official Documentation on facebook developer site:

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Add code to print out the key hash
    try {
        PackageInfo info = getPackageManager().getPackageInfo(
                "com.facebook.samples.hellofacebook", 
                PackageManager.GET_SIGNATURES);
        for (Signature signature : info.signatures) {
            MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
    } catch (NameNotFoundException e) {

    } catch (NoSuchAlgorithmException e) {

    }

Answer 16

For an Android application

This code is used to get the hash key in your Android application for Facebook integration. I have tested all devices and it's working. Only change the package name of this code:

private void facebookHashKey() {

    try {
        PackageInfo info = getPackageManager().getPackageInfo("com.app.helpcove", PackageManager.GET_SIGNATURES);
        for (Signature signature : info.signatures) {
            MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            String hashCode  = Base64.encodeToString(md.digest(), Base64.DEFAULT);
            System.out.println("Print the hashKey for Facebook :"+hashCode);
            Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
        }
    } catch (NameNotFoundException e) {

    } catch (NoSuchAlgorithmException e) {

    }
}

Answer 17

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.

Answer 18

There are two methods available complex one and the easy one

Methods One :(little Complex)

first of all you have to download ssl 64bit or 32bit accordingly, remember to download the file with name containing e after version code openssl-0.9.8e_X64.zip OR openssl-0.9.8e_WIN32.zip not with the k after the version code,

and place in AndroidStudio/jre/bin directory, if you dont know where to place, you can find this directory by right clicking on the android studio shortcut as:

now you have managed two required things in one place, but still you have to find the path for your debug.keystore, that is always can be found in the "C:\Users\yourusernamehere\.android\debug.keystore",

NOTE If your app is published already, or about to publish then use your publishing signing keystore, if and only if your are testing in development mode than you can use debug,keysotre

As everything is setup, let arrange the command you wanted to execute for the hash key generation in base64 format, and you command will look like this

keytool.exe -exportcert -alias androiddebugkey -keystore "C:\Users\ayyaz talat\.android\debug.keystore" | "D:\Program Files\Android\Android Studio\jre\bin\openssl\bin\openssl.exe" sha1 -binary |"D:\Program Files\Android\Android Studio\jre\bin\openssl\bin\openssl.exe" base64

it will promt you to enter a password for the debug.keystore, which is android by default. if you are using your own key than the password will be also yours. the output will look like this if everything goes well as expected, hope it may help

Second Method (Respectively easy one)

if you dont want to go throught all the above procedure, then just use the following method to log the haskey:

 private void printKeyHash() {
        try {
            PackageInfo info = getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_SIGNATURES);
            for (Signature signature : info.signatures) {
                MessageDigest md = MessageDigest.getInstance("SHA1");
                md.update(signature.toByteArray());
                Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
            }
        } catch (PackageManager.NameNotFoundException e) {
            Log.e("KeyHash:", e.toString());
        } catch (NoSuchAlgorithmException e) {
            Log.e("KeyHash:", e.toString());
        }
    }

output:

Answer 19

keytool -exportcert -alias androiddebugkey -keystore       C:\Users\pravin\.android\debug.keystore | "H:\OpenSSL\bin\openssl" sha1 -binary | "H:\OpenSSL\bin\openssl" base64

This worked for me ...

Steps:

1) Open command line go to - > java Keytool..... for me C:\Program Files\Java\JDK1.7\bin
2) Download OpenSSL from google
3) paste this with changing your paths -
   keytool -exportcert -alias androiddebugkey -keystore C:\Users\pravin\.android\debug.keystore | "H:\OpenSSL\bin\openssl" sha1 -binary | "H:\OpenSSL\bin\openssl" base64 

    ....................   give proper debug.keystore path and openSSL path .. 

4) Finley it may be ask u password .. so give password -> android   ...
5) you will get 28 characters that will be your has key

Answer 20

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.

Answer 21

As answered on a similar issue i found this to be working for me:

• Copy the apkname.apk file you want to know the hash of to the 'Java\jdk1.7.0_79\bin' folder
• Run this command keytool -list -printcert -jarfile apkname.apk
• Copy the SHA1 value and convert it using this site
• Use the converted Keyhash value (ex. zaHqo1xcaPv6CmvlWnJk3SaNRIQ=)

Answer 22

The simplest solution:

1. Don't add the hash key, implement everything else
2. When facebook login is pressed, you will get an error saying "Invalid key hash. The key hash "xxx" does not match any stored key. ..."
3. Open the facebook app dashboard and add the hash "xxx=" ("xxx" hash from the error + "=" sign)

Answer 23

To generate a hash of your release key, run the following command on Mac or Windows substituting your release key alias and the path to your keystore.

On Windows, use:

keytool -exportcert -alias <RELEASE_KEY_ALIAS> -keystore <RELEASE_KEY_PATH> | openssl sha1 -binary | openssl base64

This command should generate a 28 characher string. Remember that COPY and PASTE this Release Key Hash into your Facebook App ID's Android settings.

image: fbcdn-dragon-a.akamaihd.net/hphotos-ak-xpa1/t39.2178-6/851568_627654437290708_1803108402_n.png

Refer from : https://developers.facebook.com/docs/android/getting-started#release-key-hash and http://note.taable.com

Answer 24

Use this for print key hash in kotlin

try {
        val info = context.getPackageManager().getPackageInfo(context.packageName,
                PackageManager.GET_SIGNATURES);
        for (signature in info.signatures) {
            val md = MessageDigest.getInstance("SHA")
            md.update(signature.toByteArray())
            Log.d("Key hash ", android.util.Base64.encodeToString(md.digest(), android.util.Base64.DEFAULT))
        }
    }catch (e:Exception){

    }

Answer 25

Solved mine too in Android Studio but with slight different approach.

To get the SHA-1 value in Android Studio.

1. Click Gradle
2. Click Signing Report
3. Copy SHA-1

4. SHA-1 value look like this CD:A1:EA:A3:5C:5C:68:FB:FA:0A:6B:E5:5A:72:64:DD:26:8D:44:84

   and open http://tomeko.net/online_tools/hex_to_base64.php to convert your SHA1 value to base64. This is what Facebook requires get the generated hash " ********************= " and copy the key hash to the facebook app console.

Part of this answer taken from here Github Link

Answer 26

In Android Studio just click on right sidebar panel "Gradle" to show gardel panel then: -YOURAPPNAME --Task ---Android ----(double click) signingReport (to start Gradle Daemon)

then you will see result:

Config: debug
Store: C:\Users\username\.android\debug.keystore
Alias: AndroidDebugKey
MD5: C8:46:01:EA:36:02:D1:21:1B:23:19:91:D4:32:CB:AC
SHA1: 38:AB:4C:01:01:D7:62:E0:61:D1:9F:52:04:0C:E5:07:4E:E4:9B:39
SHA-256: 1B:8C:DC:35:48:10:01:2C:1F:BD:01:64:F1:01:06:01:60:01:A6:8B:10:15:2E:BF:7B:C4:FD:38:4C:C1:74:01
Valid until: Saturday, February 12, 2050

copy SHA1:

38:AB:4C:01:01:D7:62:E0:68:D1:9F:52:04:0C:E5:07:4E:E4:9B:39

go to this PAGE

Paste SHA1 and generate your Facebook key hash code.

Answer 27

I did a small mistake that should be kept in mind. If you are using your keystore then give your alias name, not androiddebugkey...

I solved my problem. Now if Facebook is there installed in my device, then still my app is getting data on the Facebook login integration. Just only care about your hash key.

Please see below.

C:\Program Files\Java\jdk1.6.0_45\bin>keytool -exportcert -alias here your alias name  -keystore "G:\yourkeystorename.keystore" |"G:\ssl\bin\openssl" sha1 -binary | "G:\ssl\bin\openssl" base64

Then press Enter - it will ask you for the password and then enter your keystore password, not Android.

Cool.

Answer 28

The best approach is to use the following code:

private void getHashKey(String pkgName)
{
    try
    {
        PackageInfo info = getPackageManager().getPackageInfo(pkgName, PackageManager.GET_SIGNATURES);
        for (Signature signature : info.signatures)
        {
            MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            String hashKey = Base64.encodeBytes(md.digest());
            _hashKey_et.setText(hashKey);
            Log.i("KeyTool", pkgName + " -> hashKey = " + hashKey);
        }
    }
    catch (NameNotFoundException e)
    {
        e.printStackTrace();
    }
    catch (NoSuchAlgorithmException e)
    {
        e.printStackTrace();
    }
}

But I was so frustrating with the fact that there is no simple tool to generate the HashKey for the Facebook app. Each time I had to play with Openssl and Keytool or to use a code to get the hash from signature ...

So I wrote a simple KeyGenTool that will do that work for you: -> KeyGenTool on Google Play <-

Enjoy :)

Answer 29

Here is Xamarin version

private void printKeyHash()
{
    try
    {
        PackageInfo info = PackageManager.GetPackageInfo(PackageName, PackageInfoFlags.Signatures);
        foreach (var signature in info.Signatures)
        {
            MessageDigest md = MessageDigest.GetInstance("SHA1");
            md.Update(signature.ToByteArray());
            var hash = Base64.EncodeToString(md.Digest(), Base64Flags.Default);
            Log.Debug("KeyHash:", hash);
        }
    }
    catch (PackageManager.NameNotFoundException e)
    {

    }
    catch (NoSuchAlgorithmException e)
    {

    }
}

Answer 30

Kotlin code to get Hash key

 private fun logHashKey() {
    try {
        val info = getPackageManager().getPackageInfo("your.package.name", PackageManager.GET_SIGNING_CERTIFICATES);
        for (signature in info.signingInfo.signingCertificateHistory) {

            val md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            val something = Base64.getEncoder().encodeToString(md.digest());
            Log.e("hash key", something);
        }
    } catch (e1: PackageManager.NameNotFoundException) {
        Log.e("name not found", e1.toString());
    } catch (e: NoSuchAlgorithmException) {
        Log.e("no such an algorithm", e.toString());
    } catch (e: Exception) {
        Log.e("exception", e.toString());
    }
}

Please don't forgot to generate keys in Debug and Release environment as they change as per build setting.

Answer 31

try this :

• two way to get Hash Key Value

1) get hash key from using command line (Official Doc : https://developers.facebook.com/docs/android/getting-started)

keytool -exportcert -alias androiddebugkey -keystore %HOMEPATH%\.android\debug.keystore | openssl sha1 -binary | openssl
base64

OR

2) get hash key using code

  @Override
   protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);

            //Hask Kay generation 
             GetKeyHase();
    }

    private void GetKeyHase() {
            try {
                PackageInfo info = getPackageManager().getPackageInfo("ADD YOUR PACKAGE NAME", PackageManager.GET_SIGNATURES);
                for (Signature signature : info.signatures) {
                    MessageDigest md = (MessageDigest.getInstance("SHA"));
                    md.update(signature.toByteArray());
                    String hashkey_value = new String(Base64.encode(md.digest(), 0));
                    Log.e("hash key", hashkey_value);
                    //check you logcat hash key value
                }
            }catch (Exception e) {
                Log.e("exception", e.toString());
            }
        }

Answer 32

I just made a tool for that exact purpose i.e., https://keyhash.vaibhavpandey.com/. It is simpler than anything else as it requires you browse the keystore on your computer and enter the passphrase to generate both SHA-1 Hex and Base64 versions for Google & Facebook respectively.

Don't worry about the keystore or passphrase as the job is done completely in-browser, you can inspect the network tab and the tool is open-source too at https://github.com/vaibhavpandeyvpz/keyhash.

Answer 33

This required no coding input. Go to Android Studio-> 
Click on Right side panel "Gradle"=>
*Your App Name =>
*Your App Name(root)=>
*Tasks=>
*android =>
*Double click on **signinReport**=>
Will get 
example :
SHA1: [![6A:DE:ED:5A:9F:0B:19:47:38:DC:DE:3B:7B:A2:D7:4C:6C:0A:24:70][1]][1]

Go to 

http://fbkeyhash.com/index.php
Paste your SHA-1

Answer 34

You can print the Hash Key from Java/Kotlin Activity. Some part of the code is deprecated but here is the complete solution with old and new code.

private fun printHashKey(context: Context) {
    try {

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            val packageInfo: PackageInfo = context.packageManager.getPackageInfo(
                context.packageName,
                PackageManager.GET_SIGNING_CERTIFICATES
            )

            for (signature in packageInfo.signingInfo.apkContentsSigners) {
                val md = MessageDigest.getInstance("SHA")
                md.update(signature.toByteArray())
                Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT))
            }
        } else {
            val packageInfo: PackageInfo = context.packageManager.getPackageInfo(
                context.packageName,
                PackageManager.GET_SIGNATURES
            )

            for (signature in packageInfo.signatures) {
                val md = MessageDigest.getInstance("SHA")
                md.update(signature.toByteArray())
                Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT))
            }
        }

    } catch (e: PackageManager.NameNotFoundException) {
        Log.d(TAG, "printHashKey: PackageManager.NameNotFoundException -> $e")
    } catch (e: NoSuchAlgorithmException) {
        Log.d(TAG, "printHashKey: NoSuchAlgorithmException -> $e")
    }
}

Answer 35

This is the method that worked for me along with few observations that I made :

1. Each SHA1 key will have a corresponding key hash which is 28 characters long and ends with a '='

2. I have tried the online tools to get the hash key out of my SHA1 but that key hash never worked for me.

3. If you are on windows install the open-ssl from here :Open ssl

4. I had used this keytool command on all the keystore files that I had i.e., staging, debug and release.

keytool -exportcert -alias my_alias_name -keystore "C:\Users\...my_filename.jks" | "C:\Openssl\bin\openssl.exe" sha1 -binary | "C:\Openssl\bin\openssl.exe" base64

Note: The above method will always give you a key hash even if you filled any of the parameters incorrectly . The trick to know you if are getting the right hash key is- after running this command if you are prompted for password , it means that the subsequent key is the right one.

Don't use my_filename.keystore but instead use my_filename.jks .