Certificate Pinning in Android

Marcos Placona
Dec 23, 2016 · 3 min read
private final OkHttpClient client = new OkHttpClient();
public void run(String url) throws Exception {
Request request = new Request.Builder()

client.newCall(request).enqueue(new Callback() {
public void onFailure(Call call, IOException e) {
Log.e(TAG, "onFailure: " + e.getMessage());

public void onResponse(Call call, okhttp3.Response response) throws IOException {
Log.d(TAG, "onResponse: " + response.body().string());

private CertificatePinner certificatePinner = new CertificatePinner.Builder()
.add("publicobject.com", "sha256/0jQVmOH3u5mnMGhGRUCmMKELXOtO9q8i3xfrgq3SfzI")

private final OkHttpClient client = new OkHttpClient
E/MainActivity: onFailure: Certificate pinning failure!
Peer certificate chain:
sha256/afwiKY3RxoMmLkuRW1l7QsPZTJPwDS2pdDROQjXw8ig=: CN=publicobject.com,OU=PositiveSSL,OU=Domain Control Validated
sha256/klO23nT2ehFDXCfx3eHTDRESMz3asj1muO+4aIdjiuY=: CN=COMODO RSA Domain Validation Secure Server CA,O=COMODO CA Limited,L=Salford,ST=Greater Manchester,C=GB
sha256/grX4Ta9HpZx6tSHkmCrvpApTQGo67CYDnvprLg5yRME=: CN=COMODO RSA Certification Authority,O=COMODO CA Limited,L=Salford,ST=Greater Manchester,C=GB
Pinned certificates for publicobject.com:
private CertificatePinner certificatePinner = new CertificatePinner.Builder()
.add("publicobject.com", "sha256/afwiKY3RxoMmLkuRW1l7QsPZTJPwDS2pdDROQjXw8ig=")
.add("publicobject.com", "sha256/klO23nT2ehFDXCfx3eHTDRESMz3asj1muO+4aIdjiuY=")
.add("publicobject.com", "sha256/grX4Ta9HpZx6tSHkmCrvpApTQGo67CYDnvprLg5yRME=")

Marcos Placona

Written by

Marcos Placona is a developer evangelist @ Twilio. He spends most of his time working with Android and .Net open source projects.

Welcome to a place where words matter. On Medium, smart voices and original ideas take center stage - with no ads in sight. Watch
Follow all the topics you care about, and we’ll deliver the best stories for you to your homepage and inbox. Explore
Get unlimited access to the best stories on Medium — and support writers while you’re at it. Just $5/month. Upgrade