type: object
properties:
  algorithm:
    type: string
    enum: ["m.megolm.v1.aes-sha2"]
    description: |-
      The encryption algorithm for the key that this event is about.
  room_id:
    type: string
    description: |-
      Required if `code` is not `m.no_olm`.  The room for the key that
      this event is about.
  session_id:
    type: string
    description: |-
      Required if `code` is not `m.no_olm`.  The session ID of the key
      that this event is about.
  sender_key:
    type: string
    description: |-
      The unpadded base64-encoded device curve25519 key of the event\'s
      sender.
  code:
    type: string
    enum:
      - m.blacklisted
      - m.unverified
      - m.unauthorised
      - m.unavailable
      - m.no_olm
    description: |-
      A machine-readable code for why the key was not sent. Codes beginning
      with `m.` are reserved for codes defined in the Matrix
      specification. Custom codes must use the Java package naming
      convention.
  reason:
    type: string
    description: |-
      A human-readable reason for why the key was not sent. The receiving
      client should only use this string if it does not understand the
      `code`.
required:
  - algorithm
  - sender_key
  - code