获取app应用的公钥

获取app应用的公钥

1、获取方法，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();
	        Log.i("签名1", iter+"");
	        Log.i("监听1","----------");
	        while (iter.hasNext()) {
	            PackageInfo info = iter.next();
	            String packageName = info.packageName;
	            //按包名 取签名
	            if (packageName.equals("com.example.babycare")) {
	            	Log.i("监听1",info.signatures[0].toByteArray()+"----------");
	                return info.signatures[0].toByteArray();
	                 
	            } 
	        }
	        
	        return null;
	    }
		
		public static String getPublicKey(byte[] signature) {
	        try {
	 
	            CertificateFactory certFactory = CertificateFactory
	                    .getInstance("X.509");
	            X509Certificate cert = (X509Certificate) certFactory
	                    .generateCertificate(new ByteArrayInputStream(signature));
	            Log.i("监听2", "22");
	            String publickey = cert.getPublicKey().toString();
	            Log.d("-------密码TRACK", publickey);
	           // publickey = publickey.substring(publickey.indexOf("modulus:") + 9,publickey.indexOf("\n", publickey.indexOf("modulus:")));
	 
	            Log.d("-------密码TRACK", publickey);
	            return publickey;
	        } catch (CertificateException e) {
	            e.printStackTrace();
	        }
	        return null;
	    }

2.在oncreate（）中调用getPublicKey(this.getSign(getApplicationContext()));

3.即可在日志中查看公钥：