Android实现获取签名及公钥的方法

本文实例讲述了android实现获取签名及公钥的方法。分享给大家供大家参考。具体如下：

1. java代码如下： 

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;
  //按包名 取签名
  if (packagename.equals("com.test.test")) {
  return info.signatures[0].tobytearray();
  } 
 }
 return null;
}

2. java代码如下：

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;
}

希望本文所述对大家的android程序设计有所帮助。