get Certificate SHA Fingerprint for Context - Android java.security

Android examples for java.security:Sha

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Description

get Certificate SHA Fingerprint for Context

Demo Code


import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;

public class Main {
  public static String getCertificateSHA1Fingerprint(Context context) {
    PackageManager pm = context.getPackageManager();
    int flags = PackageManager.GET_SIGNATURES;
    StringBuffer hexString = new StringBuffer();
    try {// w w w. j  ava2 s .  co m
      PackageInfo pi = pm.getPackageInfo(context.getPackageName(), flags);
      android.content.pm.Signature[] signatures = pi.signatures;
      byte[] cert = signatures[0].toByteArray();
      InputStream is = new ByteArrayInputStream(cert);
      CertificateFactory cf = CertificateFactory.getInstance("X509");
      X509Certificate c = (X509Certificate) cf.generateCertificate(is);
      MessageDigest md = MessageDigest.getInstance("SHA1");
      byte[] publicKey = md.digest(c.getPublicKey().getEncoded());
      for (int i = 0; i < publicKey.length; i++) {
        String appendString = Integer.toString(0xFF & publicKey[i]);
        if (appendString.length() == 1) {
          hexString.append("0");
        }
        hexString.append(appendString);
      }

    } catch (PackageManager.NameNotFoundException e) {
      e.printStackTrace();
    } catch (CertificateException e) {
      e.printStackTrace();
    } catch (NoSuchAlgorithmException e) {
      e.printStackTrace();
    }

    return hexString.toString();
  }
}

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