Generating hash key for app using facebook sdk

Question

I am using facebook sdk for login into my application. The application runs fine on HTC devices. The application also works fine on Samsung devices if there is no facebook app pre installed.

But if there is already facebook app on mobile and then the user installs my app, the user is never logged in. From what I know, I think this might be a problem of single sign on, and I think this is somewhat related with generating proper application hash key, and using the hash key in facebook application which I used to log into the mobile app.

Please guide me how to create the hash key. I am running ubuntu 10.4.

When I run this command in terminal :-

keytool -exportcert -alias <your keystore alias name>.keystore -keystore ~/.android/<your keystore name>.keystore | openssl sha1 -binary | openssl base64

I am never prompted for password, though I am given the hash key.

[Here][1] you can get your answer, it also helped me. http://stackoverflow.com/a/12405323/2331725 [1]: http://stackoverflow.com/a/12405323/2331725 — Ashher Alam, Jul 02 '13 at 09:31
To generate hashkey[Simple Method is here][1] [1]: http://stackoverflow.com/questions/5306009/facebook-android-generate-key-hash/12405323#12405323 — karthik, Nov 14 '13 at 20:00
I have generated the key hash but don't know where to put that key, would you guide me? I'm running android studio on Ubuntu. — Apurva, Oct 08 '15 at 18:31
Did you find the mistake? Exactly which command helped you?I am facing the same problem. — Shruti, May 08 '17 at 09:22

score 62 · Answer 1 · edited May 13 '11 at 10:13

62

Try this:

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

I hope you will get it. I just checked it and I got the prompt for password.

edited May 13 '11 at 10:13

Awais Qarni

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answered May 13 '11 at 08:56

Lavanya

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i am not using debug keystore to sighn the application.i am creatng a new keystore – abhishek May 13 '11 at 09:31
in my case it is not even asking for the password for androiddebugkeystore... what could possibly be wrong – abhishek May 13 '11 at 09:39
did u type that exactly? check the spaces and all? in case of debugkeystore – Lavanya May 13 '11 at 10:02
I am sorry then i am clue less now. – Lavanya May 13 '11 at 12:22
That command worked for me on ubuntu 10.10, where as the cmd noted in the facebook docs didn't. Thanks. – scottyab Jul 20 '11 at 06:19
Worked for me on Ubuntu 12.04 ! – Skynet Jan 07 '14 at 04:40
I have generated the key hash but don't know where to put that key, would you guide me? I'm running android studio on Ubuntu. – Apurva Oct 08 '15 at 18:32

score 46 · Answer 2 · answered Feb 19 '13 at 12:21

46

You can use this code block to generate hash key. Put this code block in your onCreate() method.

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

    } catch (NoSuchAlgorithmException e) {

    }

answered Feb 19 '13 at 12:21

ACengiz

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Worked perfectly for me...did also try below command to get the same result: keytool -exportcert -alias androiddebugkey -keystore ~/.android/debug.keystore | openssl sha1 -binary | openssl base64 – Vinay Oct 17 '13 at 13:17
2

this is it. remember to change "Your package name" with your package name ;) – OWADVL Mar 24 '14 at 20:58
3

Does this code produce same hash key in both: debug and release? – Kostadin Mar 31 '14 at 13:00
I have generated the key hash but don't know where to put that key, would you guide me? I'm running android studio on Ubuntu. – Apurva Oct 08 '15 at 18:32

Rishabh Chandel · Answer 3 · 2017-05-09T13:08:04.970

4

If it's not prompting you for password, then first open your terminal and type :

sudo apt install openjdk-8-jre-headless

And then follow the regular way, just type:

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

For password put: android You are all done.

This answer is for debug purpose only, for release purpose use your .jks file to generate hash key.

edited May 09 '17 at 13:08

answered Feb 09 '17 at 20:49

Rishabh Chandel

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Worked like a charm !! – Shruti May 08 '17 at 09:38
Thank you, just made the switch to Ubuntu and been trying to fix this for a couple of hours. – Ahmad Magdy Aug 31 '19 at 16:06

score 3 · Answer 4 · edited Mar 20 '18 at 12:07

3

Just give the command as:

keytool -exportcert -alias androiddebugkey -keystore debug.keystore

and give the keystroke password or android or enter

Here you have to go to the directory structure until ".android" then run this commnad.In general the path is C:\Users\User-name\.android>.

edited Mar 20 '18 at 12:07

Fabian Lauer

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answered Oct 17 '12 at 07:06

rishi

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I have generated the key hash but don't know where to put that key, would you guide me? I'm running android studio on Ubuntu. – Apurva Oct 08 '15 at 18:32

score 2 · Answer 5 · edited Dec 18 '13 at 04:51

2

Check three parts in your environment.

where is "debug.keystore"?

find / -name "debug.keystore"

if you can't find it, check you eclipse or ADT.
what is alias name?

keytool -list -v -keystore "PATH_TO_DEBUG_KEYSTORE"
Check if installed openssl

openssl

If everything is ready, it should prompt for password

edited Dec 18 '13 at 04:51

Lavanya

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answered Feb 27 '13 at 17:11

Kislingk

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I have generated the key hash but don't know where to put that key, would you guide me? I'm running android studio on Ubuntu. – Apurva Oct 08 '15 at 18:32
after entering the password for release apk showing chines language please help me – Harsha Sep 29 '16 at 07:18

score 0 · Answer 6 · edited May 17 '16 at 11:08

0

C:\openssl\bin>keytool -exportcert -alias aliasName -keystore "C:\Users\s\.android\debu
g.keystore" | "C:\openssl\bin\openssl" sha1 -binary | "C:\openssl\bin\openssl" b
ase64
Enter keystore password:  android
GEYtOJobR4NzuxX4iOl/yR6sla4=

edited May 17 '16 at 11:08

CherryDT

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answered May 17 '16 at 10:37

vikash sain

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Generating hash key for app using facebook sdk

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