Could be useful when trying to run JS crypto code that you don't want to be JIT'd out of constant-time?https://twitter.com/v8js/status/1105777150051999744?s=19 …
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Deirdre Connolly¹ Retweeted V8
Could be useful when trying to run JS crypto code that you don't want to be JIT'd out of constant-time?https://twitter.com/v8js/status/1105777150051999744?s=19 …
Deirdre Connolly¹ added,
hmm, but is interpreted JavaScript going to be any better for constant-time cryptography implementations? i feel as if your only option is WebAssembly
wasm is still bytecode, not native, I'm not sure but I think there can still be JITing involved that may alter behavior, there are just fewer assumptions to make than high level JS
of course, but if WebAssembly was to support a JIT-less mode, whereby bytecode was simply transpiled to the corresponding native code without optimization, then it would probably be possible to ship constant-time cryptography
Yes JIT-less WASM would be good for multiple reasons; depending in your needs (speed vs auditability, say) you may rather have JIT-less JavaScript, but having the leisure to choose would be 
but, even once you've eliminated JIT, what are the constant-time guarantees of the JavaScript interpreter, if any?
I'm not sure, given how complex engines like V8 have become, I wouldn't be surprised if there were side channels in other areas. However, I don't know if those don't also exist for WASM. 
A nice proposal for constant-time WebAssembly code: https://arxiv.org/abs/1808.01348
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