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matrix-spec-proposals/event-schemas/schema/m.forwarded_room_key

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---
allOf:
- $ref: core-event-schema/event.yaml
description: |-
This event type is used to forward keys for end-to-end encryption. Typically
it is encrypted as an ``m.room.encrypted`` event, then sent as a `to-device`_
event.
properties:
content:
properties:
algorithm:
type: string
description: |-
The encryption algorithm the key in this event is to be used with.
room_id:
type: string
description: The room where the key is used.
sender_key:
type: string
description: |-
The Curve25519 key of the device which initiated the session originally.
session_id:
type: string
description: The ID of the session that the key is for.
session_key:
type: string
description: The key to be exchanged.
sender_claimed_ed25519_key:
type: string
description: |-
The Ed25519 key of the device which initiated the session originally.
It is 'claimed' because the receiving device has no way to tell that the
original room_key actually came from a device which owns the private part of
this key unless they have done device verification.
forwarding_curve25519_key_chain:
type: array
items:
type: string
description: |-
Chain of Curve25519 keys. It starts out empty, but each time the
key is forwarded to another device, the previous sender in the chain is added
to the end of the list. For example, if the key is forwarded from A to B to
C, this field is empty between A and B, and contains A's Curve25519 key between
B and C.
required:
- algorithm
- room_id
- session_id
- session_key
- sender_claimed_ed25519_key
- forwarding_curve25519_key_chain
- sender_key
type: object
type:
enum:
- m.forwarded_room_key
type: string
type: object