fix: encrypt/decrypt node #133
Merged
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Small frames exacerbate a race between VerifyStream and DecipherStream. Once an `AuthTag` event is sent to DecipherStream the current frame is decrypted and verified before being flushed. More frame data will not be processed by DecipherStream because DecipherStream will not execute the _transform callback until the frame is flushed. However nothing stops VerifyStream from continuing to process data. VerifyStream will push the next frame's data, which will be cached by DecipherStream. But once VerifyStream reaches the end of the frame it will emit `AuthTag`. This means the DecipherStream will receive the AuthTag before the frame data and it will correctly fail on precondition checks. To resolve this a simple callback is passed from VerifyStream to DecipherStream in the `AuthTag` event. Tests for both encrypt and decrypt are included here, because that is how this issue was found.
lizroth
previously approved these changes
Jul 9, 2019
lizroth
approved these changes
Jul 9, 2019
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Small frames exacerbate a race between VerifyStream and DecipherStream.
Once an
AuthTagevent is sent to DecipherStreamthe current frame is decrypted and verified before being flushed.
More frame data will not be processed by DecipherStream
because DecipherStream will not execute the _transform callback
until the frame is flushed.
However nothing stops VerifyStream from continuing to process data.
VerifyStream will push the next frame's data,
which will be cached by DecipherStream.
But once VerifyStream reaches the end of the frame it will emit
AuthTag.This means the DecipherStream will receive the AuthTag before the frame data
and it will correctly fail on precondition checks.
To resolve this a simple callback is passed from VerifyStream to DecipherStream
in the
AuthTagevent.Tests for both encrypt and decrypt are included here,
because that is how this issue was found.
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.