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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>
 		11 months ago
..
.gitignore
…
1685.clarification
…
1687.clarification
…
1690.clarification Make clearer in the example that the fallback prefix sequence should be repeated for each line (#1690) 11 months ago
1695.clarification Clarify secret storage format (#1695) 12 months ago
1712.clarification Clarify that the key backup MAC is implemented incorrectly (#1712) 11 months ago