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Code Issues Releases Wiki Activity

docs/common: add note on session id / state size

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This commit is contained in:
Tomas Susanka 2020-02-18 13:55:52 +00:00
parent cfa14dcca0
commit 394fad9d6d
1 changed files with 4 additions and 2 deletions
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docs/common/communication/passphrase-redesign-migration.md
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@ -77,8 +77,7 @@ with `PassphraseAck()` with no fields set.
TT version \< 2.3.0 will send `Deprecated_PassphraseStateRequest(state=[bytes])` after
receiving `PassphraseAck`. The Host should immediately respond with
`Deprecated_PassphraseStateAck()` with no fields set. If the Host does session
management, it should store the value of `state` as the session ID. Note that `state`
used to be 64 bytes long, but `session_id` is only 32 bytes.
management, it should store the value of `state` as the session ID.
### Triggering passphrase prompt
@ -143,3 +142,6 @@ both T1 and TT with both older and newer firmwares.
5. When you receive a `Deprecated_PassphraseStateRequest(state=...)`, store the value
of `state` as `stored_session_id`, and respond with `Deprecated_PassphraseStateAck`
with no fields set.
Note: up to 64 bytes may be required to store the session ID. Firmwares < 2.3.0 use a
64-byte value, newer firmwares use a 32-byte value.