I think that they are not providing it in this case, but both IBM and Siemens are known for developing such technology. Siemens often gets mentioned with Iran, while IBM is known to have sold such technology to Chinese companies (not necessarily governments).
It seems though that China realizes a lot of those things work better when nobody knows how things work. Even the Tor project every now and then calls for people to leak information to help with censorship circumvention. It's an arms race and of course companies and governments have more resources.
Likely Huawei, they are big in the space and are under the control of the government (the ownership structure is secret, but well, it's secret for a reason).
