The source code is for generating the QR code is online here:
<a href="https:&#x2F;&#x2F;github.com&#x2F;WhisperSystems&#x2F;libsignal-protocol-java&#x2F;blob&#x2F;master&#x2F;java&#x2F;src&#x2F;main&#x2F;java&#x2F;org&#x2F;whispersystems&#x2F;libsignal&#x2F;fingerprint&#x2F;ScannableFingerprint.java" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;WhisperSystems&#x2F;libsignal-protocol-java&#x2F;bl...</a>