How to generate key hash for facebook in android

1. Using OpenSSL and command prompt

• Download openssl from Download
• Extract it. Create a folder- OpenSSL in C: / and copy all files here
• Find “debug.keystore” file path. Most likely it will be inside “C:\Users\\.android” folder. In my system it is under “C:\Program Files\Java\jdk1.7.0_67\bin”
• Open command prompt (Run-> cmd->start) and go to java /bin folder (cd “C:\Program Files\Java\jdk1.7.0_67\bin” command will do it for you)

Now you run the below command.

C:\\Program Files\\Java\\jdk1.6.0_30\\bin>keytool -exportcert 
 -alias androiddebugkey -keystore "C:\\Users\\.android\\debug.keystore" | "C:\\OpenSSL\\bin\\openssl" sha1 -binary |"C:\\OpenSSL\bin\\openssl" base64

Enter keystore password:android

2. Using a method call from android code
Using below code snippet, you can get the hash code.

@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) {
       

Check your logcat output for a message.

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