如何在Android中实现叶/中间证书固定？

Question

我已经在我的项目中实现了叶子证书,它工作正常.请检查下面的代码,现在问题是叶子证书将在我的服务器中一年后过期所以我想验证叶子证书,以便当它过期/无效时我可以使用中间证书吗？

有没有任何例子来实施中间证书？

请帮我!

码:-

SSLContext sslContext = null;
        try {
            CertificateFactory cf = CertificateFactory.getInstance("X.509");
            InputStream caInput = context.getResources().openRawResource(certRawRef);
            Certificate ca;
            try {
                ca = cf.generateCertificate(caInput);
            } finally {
                caInput.close();
            }
            // Create a KeyStore containing our trusted CAs
            String keyStoreType = KeyStore.getDefaultType();
            KeyStore keyStore = KeyStore.getInstance(keyStoreType);
            keyStore.load(null, null);
            keyStore.setCertificateEntry("ca", ca);
            // Create a TrustManager that trusts the CAs in our KeyStore
            String tmfAlgorithm = TrustManagerFactory.getDefaultAlgorithm();
            TrustManagerFactory tmf = TrustManagerFactory.getInstance(tmfAlgorithm);
            tmf.init(keyStore);
            // Create an SSLContext that uses our TrustManager

            sslContext = SSLContext.getInstance("TLSv1.2");
            sslContext.init(null, tmf.getTrustManagers(), null);
            return sslContext;
        } catch (Exception e) {
            Log.e("EXCEPTION",e.toString());
            //Print here right certificate failure issue
        }

Answer 1

最后我找到了答案：-

try {
            CertificateFactory cf = CertificateFactory.getInstance("X.509");
            InputStream caInputLeaf = context.getResources().openRawResource(leafCert);
            InputStream caInputInter = context.getResources().openRawResource(interCert);
            try {
                if (cf != null) {
                    ca = cf.generateCertificate(caInputLeaf);

                    URL url = new URL(URL);
                    HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
                    conn.setRequestMethod("GET");
                    conn.connect();

                    chain = conn.getServerCertificates();
                    if(chain!=null && chain[0].equals(ca)) {           //Return Leaf certificate
                        return ca;
                    }
                    else{                                   //Return Intermediate certificate
                        ca = cf.generateCertificate(caInputInter);
                        return ca;
                    }
                }
            } catch (Exception cee) {
                ca = cf.generateCertificate(caInputInter);
                return ca;
            }
        } catch (Exception e) {
            Log.e("EXCEPTION", e.toString());
        }