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I've built an S3 client with similar goals like TFA, but supports pre-signing:

Pre-signing is about 30 times faster than the AWS SDK and is not async.

You can read about why it looks like it does here: https://github.com/nikeee/lean-s3/blob/main/DESIGN_DECISIONS...

FYI, you can add browser support by using noble-hashes[1] for SHA256/HMAC - it's a well-done library, and gives you performance that is indistinguishable from native crypto on any scale relevant to S3 operations. We use it for our in-house S3 client.

[1] https://github.com/paulmillr/noble-hashes

SHA256 and HMAC are widely available in the browser APIs: https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypt...

SublteCrypto is async, and the author specifically said they want their API to be sync.

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