Updating digest with web crypto

For some context, I'm updating some code that was importing from std/hashstd/hash (specifically std/hash/sha256std/hash/sha256) to use std/cryptostd/crypto since the hash submodule is long gone.

I've run up against a case where I'm not really sure what I should do to move forward. The code looks something like this:

const digest = new Sha256()

for await (const chunk of generate.chunks()) {
  digest.update(chunk)
}

if(some_condition) {
  digest.update(bonus_chunk)
}

return digest.hex()

const digest = new Sha256()

for await (const chunk of generate.chunks()) {
  digest.update(chunk)
}

if(some_condition) {
  digest.update(bonus_chunk)
}

return digest.hex()

Is this possible to handle in the web crypto standard? I'm pretty sure I should just be able to aggregate the chunks into one massive uint8array or something but I feel like there is no reason to buffer the whole thing into memory.

Any ideas?

Deno•4y ago•

29 replies

ioB

Updating digest with web crypto

const digest = new Sha256()

for await (const chunk of generate.chunks()) {
  digest.update(chunk)
}

if(some_condition) {
  digest.update(bonus_chunk)
}

return digest.hex()

const digest = new Sha256()

for await (const chunk of generate.chunks()) {
  digest.update(chunk)
}

if(some_condition) {
  digest.update(bonus_chunk)
}

return digest.hex()

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Updating digest with web crypto

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