get Certificate SHA Fingerprint - Android java.security

Android examples for java.security:Certificate

  1. HOME
  2. Android
  3. java.security
  4. Certificate

Description

get Certificate SHA Fingerprint

Demo Code

/*/*  w  w  w.  jav  a2s  .  c  o  m*/
   Radiobeacon - Openbmap wifi and cell logger
    Copyright (C) 2013  wish7

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.util.Log;
import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateEncodingException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;

public class Main{
    private static final String TAG = CertificateUtils.class
            .getSimpleName();
    public static String getCertificateSHA1Fingerprint(Context context) {
        PackageManager pm = context.getPackageManager();
        String packageName = context.getPackageName();
        int flags = PackageManager.GET_SIGNATURES;
        PackageInfo packageInfo = null;
        try {
            packageInfo = pm.getPackageInfo(packageName, flags);
        } catch (PackageManager.NameNotFoundException e) {
            Log.e(TAG, e.toString(), e);
        }
        Signature[] signatures = packageInfo.signatures;
        byte[] cert = signatures[0].toByteArray();
        InputStream input = new ByteArrayInputStream(cert);
        CertificateFactory cf = null;
        try {
            cf = CertificateFactory.getInstance("X509");
        } catch (CertificateException e) {
            Log.e(TAG, e.toString(), e);
        }
        X509Certificate c = null;
        try {
            c = (X509Certificate) cf.generateCertificate(input);
        } catch (CertificateException e) {
            Log.e(TAG, e.toString(), e);
        }
        String hexString = null;
        try {
            MessageDigest md = MessageDigest.getInstance("SHA1");
            byte[] publicKey = md.digest(c.getEncoded());
            hexString = byte2HexFormatted(publicKey);
        } catch (NoSuchAlgorithmException e1) {
            Log.e(TAG, e1.toString(), e1);
        } catch (CertificateEncodingException e) {
            Log.e(TAG, e.toString(), e);
        }
        return hexString;
    }
    private static String byte2HexFormatted(byte[] arr) {
        StringBuilder str = new StringBuilder(arr.length * 2);
        for (int i = 0; i < arr.length; i++) {
            String h = Integer.toHexString(arr[i]);
            int l = h.length();

            if (l == 1)
                h = "0" + h;

            if (l > 2)
                h = h.substring(l - 2, l);

            str.append(h.toUpperCase());

            if (i < (arr.length - 1))
                str.append(':');
        }
        return str.toString();
    }
}

Related Tutorials