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Why is crypto.subtle.digest async? (programming.dev)

submitted 5 months ago by [email protected] to c/[email protected]

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Why is crypto.subtle.digest designed to return a promise?

Every other system I've ever worked with has the signature hash(bytes) => bytes, yet whatever committee designed the Subtle Crypto API decided that the browser version should return a promise. Why? I've looked around but I've never found any discussion on the motivation behind that.

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[–] [email protected] 2 points 5 months ago (1 children)

Sounds like an architectural issue to begin with. A constructor shouldn't do the heavy lifting to begin with.

[–] [email protected] -2 points 5 months ago (1 children)

You consider calculating the hash of a few bytes to be heavy lifting?

[–] [email protected] 3 points 5 months ago

The API doesn't restrict the amount of bytes to be hashed. So yeah it's still heavy lifting.

Trigger a loading event after the constructor is finished that the view model takes to calculate your hash.