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Add description of the olm type and body JSON keys

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Mark Haines 2015-07-24 16:07:03 +01:00
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specification/41_end_to_end_encryption.rst
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@ -256,6 +256,21 @@ Using Olm
"body": "<base_64>"
} } } }
The ciphertext is a mapping from device curve25519 key to an encypted payload
for that device. The ``body`` is a base64 encoded message body. The type is an
integer indicating the type of the message body: 0 for the intial pre-key
message, 1 for ordinary messages.
Olm sessions will generate messages with a type of 0 until they receive a
message. Once a session has decrypted a message it will produce messages with
a type of 1.
When a client receives a message with a type of 0 it must first check if it
already has a matching session. If it does then it will use that session to
try to decrypt the message. If there is no existing session then the client
must create a new session and use the new session to decrypt the message. A
client must not persist a session or remove one-time keys used by a session
until it has sucessfully decrypted a message using that session.
The plaintext payload is of the form: