Android realizes the method of obtaining signature and public key _android

This article describes the Android implementation of the method of acquiring signatures and public keys. Share to everyone for your reference. Specifically as follows:

1. The Java code is as follows:

Private byte[] Getsign (context context) {
 Packagemanager pm = Context.getpackagemanager ();
 List<packageinfo> apps = pm
  . getinstalledpackages (packagemanager.get_signatures);
 Iterator<packageinfo> iter = Apps.iterator ();
 while (Iter.hasnext ()) {
  PackageInfo info = Iter.next ();
  String packagename = info.packagename;
  Sign
  if (packagename.equals ("Com.test.test")) by package name {return
  info.signatures[0].tobytearray ();
  } 
 } return
 null;
}

2. The Java code is as follows:

public static String Getpublickey (byte[] signature) {
try {
  certificatefactory certfactory = certificatefactory
   . getinstance ("X.509");
  X509Certificate cert = (x509certificate) certfactory
   . Generatecertificate (New Bytearrayinputstream (signature));
  String PublicKey = Cert.getpublickey (). toString ();
  PublicKey = publickey.substring (Publickey.indexof ("modulus:") + 9,
   publickey.indexof ("\ n", Publickey.indexof (" Modulus: "));
  LOG.D ("TRACK", PublicKey);
  return publickey;
 } catch (Certificateexception e) {
  e.printstacktrace ();
 }
 return null;
}

I hope this article will help you with your Android program.