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Sumner Evans 9a5cacda90
Clarify that the key backup MAC is implemented incorrectly (#1712) 
* Clarify that the key backup MAC is implemented incorrectly

Due to a bug in libolm, all implementations of the
m.megolm_backup.v1.curve25519-aes-sha2 key backup algorithm incorrectly
pass an empty string through HMAC-SHA-256 to generate the `mac` property
of the `session_data`.

It was intended for the entire raw encrypted data to be passed through
HMAC-SHA-256, but the issue was caught too late in the process, and thus
we are stuck with this until a new key backup algorithm is introduced.

This commit clarifies the real-world behavior of all current
implementations.

Signed-off-by: Sumner Evans <sumner@beeper.com>
 		2 years ago
..
changelog Matrix 1.9 2 years ago
client-server-api Clarify that the key backup MAC is implemented incorrectly (#1712) 2 years ago
rooms Add room version 11 (#1604) 2 years ago
_index.md Clarify that Unix timestamps disregard leap seconds since 1970 (#1627) 2 years ago
appendices.md Fix typo in canonical JSON grammar (#1652) 2 years ago
application-service-api.md Add spec for MSC2659: application service ping endpoint (#1516) 3 years ago
identity-service-api.md Add a hyphen between third and party when used as an adjective (#1447) 3 years ago
proposals.md Get rid of the `proprosal-in-review` label (#1036) 4 years ago
push-gateway-api.md Add standard error responses (MSC3743). (#1347) 3 years ago
server-server-api.md server-server-api: Fix grammar in server discovery (#1665) 2 years ago