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# Licensed under the Apache License, Version 2.0 (the "License");
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type: object
title: BackedUpSessionData
description: |-
  The format of a backed-up session key, prior to encryption, when using the
  `m.megolm_backup.v1.curve25519-aes-sha2` algorithm.
properties:
  algorithm:
    type: string
    description: |-
      The end-to-end message encryption algorithm that the key is for. Must be `m.megolm.v1.aes-sha2`.
  forwarding_curve25519_key_chain:
    type: array
    items:
      type: string
    description: |-
      Chain of Curve25519 keys through which this session was forwarded, via [m.forwarded_room_key](#mforwarded_room_key) events.
  sender_key:
    type: string
    description: |-
      Unpadded base64-encoded device Curve25519 key.
  sender_claimed_keys:
    type: object
    additionalProperties:
      type: string
    description: |-
      A map from algorithm name (`ed25519`) to the Ed25519 signing key of the sending device.
  session_key:
    type: string
    description: |-
      Unpadded base64-encoded session key in [session-export format](https://gitlab.matrix.org/matrix-org/olm/blob/master/docs/megolm.md#session-export-format).
example: {
  "algorithm": "m.megolm.v1.aes-sha2",
  "forwarding_curve25519_key_chain": [
    "hPQNcabIABgGnx3/ACv/jmMmiQHoeFfuLB17tzWp6Hw"
  ],
  "sender_key": "RF3s+E7RkTQTGF2d8Deol0FkQvgII2aJDf3/Jp5mxVU",
  "sender_claimed_keys": {
    "ed25519": "aj40p+aw64yPIdsxoog8jhPu9i7l7NcFRecuOQblE3Y",
  },
  "session_key": "AgAAAADxKHa9uFxcXzwYoNueL5Xqi69IkD4sni8Llf..."
}
required:
  - algorithm
  - forwarding_curve25519_key_chain
  - sender_key
  - sender_claimed_keys
  - session_key