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to-device messages can be processed out-of-order, causing dropped keys and decryption errors #25723

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richvdh opened this issue Jul 5, 2023 · 3 comments
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to-device messages can be processed out-of-order, causing dropped keys and decryption errors #25723

richvdh opened this issue Jul 5, 2023 · 3 comments
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A-E2EE O-Uncommon Most users are unlikely to come across this or unexpected workflow S-Major Severely degrades major functionality or product features, with no satisfactory workaround T-Defect Z-Awaiting-Element-R Issues in code which will be replaced by the port of Element's crypto layer to Rust

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@richvdh
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richvdh commented Jul 5, 2023

Events - including to-device messages - received over /sync are decrypted in parallel. libolm can handle some reordering of to-device messages: it remembers up to 40 "skipped keys", but in extreme cases, this parallelisation can cause reordering so bad that message keys are forgotten.
@richvdh richvdh added T-Defect S-Major Severely degrades major functionality or product features, with no satisfactory workaround A-E2EE O-Uncommon Most users are unlikely to come across this or unexpected workflow Z-Awaiting-Element-R Issues in code which will be replaced by the port of Element's crypto layer to Rust labels Jul 5, 2023
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richvdh commented Jul 5, 2023

related to element-hq/element-meta#762

This was referenced Jul 5, 2023
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@richvdh richvdh mentioned this issue Oct 5, 2023
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@BillCarsonFr
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Adding a test to the complement crypto test list

@andybalaam andybalaam mentioned this issue Mar 22, 2024
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@kegsay
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kegsay commented Jun 13, 2024

Test written and passing, closing.

@kegsay kegsay closed this as completed Jun 13, 2024
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A-E2EE O-Uncommon Most users are unlikely to come across this or unexpected workflow S-Major Severely degrades major functionality or product features, with no satisfactory workaround T-Defect Z-Awaiting-Element-R Issues in code which will be replaced by the port of Element's crypto layer to Rust
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