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Document how to use Conscrypt on Android #3301

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Document how to use Conscrypt on Android
ejona86 Aug 2, 2017
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insertProviderAt instead of addProvider
ejona86 Aug 21, 2017
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31 changes: 29 additions & 2 deletions SECURITY.md
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Expand Up @@ -10,9 +10,36 @@ On Android, use the [Play Services Provider](#tls-on-android). For non-Android s

## TLS on Android

On Android we recommend the use of the [Play Services Dynamic Security Provider](http://appfoundry.be/blog/2014/11/18/Google-Play-Services-Dynamic-Security-Provider) to ensure your application has an up-to-date OpenSSL library with the necessary ciper-suites and a reliable ALPN implementation.
On Android we recommend the use of the [Play Services Dynamic Security
Provider](https://www.appfoundry.be/blog/2014/11/18/Google-Play-Services-Dynamic-Security-Provider/)
to ensure your application has an up-to-date OpenSSL library with the necessary
ciper-suites and a reliable ALPN implementation. This requires [updating the
security provider at
runtime](https://developer.android.com/training/articles/security-gms-provider.html).

You may need to [update the security provider](https://developer.android.com/training/articles/security-gms-provider.html) to enable ALPN support, especially for Android versions < 5.0. If the provider fails to update, ALPN may not work.
Although ALPN mostly works on newer Android releases (especially since 5.0),
there are bugs that impact users that are only fixed by upgrading the security
provider. In addition, for many users it is updated more quickly after
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@ericgribkoff ericgribkoff Aug 5, 2017

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The "it" here is a little bit confusing. Would it convey the same message to combine this and the previous sentence, into something like this:

Although ALPN mostly works on newer Android releases (especially since 5.0),
there are bugs and discovered security vulnerabilities that are only fixed by
upgrading the security provider. Thus, we recommend using the Play Service
Dynamic Security Provider for all Android versions.

discovered security vulnerabilities. Thus, we recommend using the Play Service
Dynamic Security Provider for all Android versions.

### Bundling Conscrypt

If depending on Play Services is not an option for your app, then you may bundle
[Conscrypt](https://conscrypt.org) with your application. Binaries are available
on [Maven
Central](https://search.maven.org/#search%7Cga%7C1%7Cg%3Aorg.conscrypt%20a%3Aconscrypt-android).

Like the Play Services Dynamic Security Provider, you must still "install"
Conscrypt before use.

```java
import org.conscrypt.Conscrypt;
import java.security.Security;
...

Security.addProvider(Conscrypt.newProvider());
```

## TLS with OpenSSL

Expand Down