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by tptacek 4607 days ago
Probably not. Maddeningly, the W3C Web Crypto project decided to define a crypto interface in terms of primitives knitted together with Javascript, so, while you can probably assume WebCrypto AES is real native AES (assuming you're not dealing with polyfills, which is a real problem for any crypto extension), you can't assume the glue code in the cryptosystem is secure --- that's left up to content-controlled Javascript to define.