KeyHashGenerator.java

package global.raiser.plugins.utils;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.net.Uri;
import android.util.Base64;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class KeyHashGenerator {
    public static String generateKeyHash(Context context) {
        final String packageName = context.getPackageName();
        try {
            final PackageInfo info = context.getPackageManager().getPackageInfo(packageName, PackageManager.GET_SIGNATURES);
            for (final Signature signature : info.signatures) {
                final MessageDigest messageDigest = MessageDigest.getInstance("SHA");
                messageDigest.update(signature.toByteArray());
                final String signatureHash = Base64.encodeToString(messageDigest.digest(), Base64.NO_WRAP);

                final Uri.Builder builder = new Uri.Builder();
                final Uri uri = builder.scheme("msauth")
                        .authority(packageName)
                        .appendPath(signatureHash)
                        .build();

                return uri.toString();
            }
        } catch (PackageManager.NameNotFoundException | NoSuchAlgorithmException e) {
            e.printStackTrace();
        }
        return "";
    }
}