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matrix-spec-proposals/event-schemas/schema/m.key.verification.start$m....

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---
allOf:
- $ref: core-event-schema/event.yaml
description: |-
Begins a SAS key verification process using the ``m.sas.v1`` method. Typically sent as a `to-device`_ event.
properties:
content:
properties:
from_device:
type: string
description: |-
The device ID which is initiating the process.
transaction_id:
type: string
description: |-
An opaque identifier for the verification process. Must be unique
with respect to the devices involved. Must be the same as the
``transaction_id`` given in the ``m.key.verification.request``
if this process is originating from a request.
method:
type: string
enum: ["m.sas.v1"]
description: |-
The verification method to use.
key_agreement_protocols:
type: array
description: |-
The key agreement protocols the sending device understands. Should
include at least ``curve25519-hkdf-sha256``.
items:
type: string
hashes:
type: array
description: |-
The hash methods the sending device understands. Must include at least
``sha256``.
items:
type: string
message_authentication_codes:
type: array
description: |-
The message authentication codes that the sending device understands.
Must include at least ``hkdf-hmac-sha256``.
items:
type: string
short_authentication_string:
type: array
description: |-
The SAS methods the sending device (and the sending device's user)
understands. Must include at least ``decimal``. Optionally can include
``emoji``.
items:
type: string
enum: ["decimal", "emoji"]
required:
- from_device
- transaction_id
- method
- key_agreement_protocols
- hashes
- message_authentication_codes
- short_authentication_string
type: object
type:
enum:
- m.key.verification.start
type: string
type: object