Prefer Uint8Array as internal representation of binary data #219
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This is part of a push to support larger files. The focus is the switch
to using Uint8Array to store binary data. But also includes:
- When running on Node, use Buffer.from() for hex string conversions.
- To avoid large buffer copy, signedMsg as been replaced by an object
containing iv, encrypted, and hmac.
- hmac calculation has changed so it avoids copying (possibly very
large) encrypted data. See signDigest() in lib/codec.js.
- Minor cleanup
Handling hex encode/decode at the input/output boundaries and using
Uint8Array internally for representing binary data has these benefits:
- More memory efficient, allows processing of 2x larger files.
- Aligns with cryptographic best practices: hashing is now performed
on raw binary data (Uint8Array) instead of hex strings.
- Behavior is (mostly) unchanged
- scripts/index_template.html textContent is not implemented and
needs to be redesigned.
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Summary
Use Uint8Array to store binary data. This is a major refactor based on number of lines, but low in complexity, most of the changes are almost mechanical.
Resolves
Resolves #215, #216, #217, #218
Details
Testing
I manually tested node encrypt, node decrypt, and HTML wrapper decrypt.
Notes for Reviewers
The scope should have been limited strictly to the switch from hex strings to Uint8Array, but I included other changes related to memory reduction. I admit that was a mistake. I regret including these smaller changes which should have been separate commits: