Android

How to Generate Key Hash for FaceBook Integration

To Generate Key Hash we have 2 Ways

Way 1 :
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Just follow the below given Steps and you are done with this.

Step I: Download OpenSSL from here

Step II: Download openssl-0.9.8e_X64.zip for 64 bit PC and openssl-0.9.8e_WIN32.zip for 32 bit PC

Step III: once your download the zip folder. Go to C drive(where window is installed) and make a folder named OpenSSL

Step IV: extract all zip file in this folder.

Step V: Now go to Java folder and copy path of jre. For example: C:\Program Files\Java\jre1.8.0_101\bin

(make sure your are in JRE folder not in JDK folder,)

Step VI: Now open Cmd in your PC. Type Cd C:\Program Files\Java\jre1.8.0_101\bin

Now copy the below code after this

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

instead of Aravindraj you need to use your computer name. and the C:\openssl\bin\openssl is path where we extracted the zip file.

After this command will promt you for password. Just enter android .

You will have your key hash in front of you.

Way 2 : Generating keyHash Programatically

Inside oncreate Method of the Activity call this Function

   printKeyHash(MainActivity.this);

 Note:Replace Main activity with your activity name 

public static String printKeyHash(Activity context) {
    PackageInfo packageInfo;
    String key = null;
    try {
        //getting application package name, as defined in manifest        String packageName = context.getApplicationContext().getPackageName();

        //Retriving package info        packageInfo = context.getPackageManager().getPackageInfo(packageName,
                PackageManager.GET_SIGNATURES);

        Log.e("Package Name=", context.getApplicationContext().getPackageName());

        for (Signature signature : packageInfo.signatures) {
            MessageDigest md = MessageDigest.getInstance("SHA");
            md.update(signature.toByteArray());
            key = new String(Base64.encode(md.digest(), 0));

            // String key = new String(Base64.encodeBytes(md.digest()));            Log.e("Key Hash=", key);
        }
    } catch (PackageManager.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());
    }

    return key;
}

Thanks, Happy Coding ;)