Hello everybody
To analyze the FedOne federation protocol a little bit more in detail,
I have generated wireshark-plugins for the messages defined in the
federation.protodevel file.
With these wireshark plugins, I tried to analyze the base64 encoded
CDATA field. An example is given below for the exchange of a
ProtocolAppliedWaveletDelta message in a federated scenario (the hex
values for the hash-values and signature bytes are changed to base64
and added manually).
While analyzing the trace the following questions arise:
1. I think, I understand the structures in operation [1] and operation
[2] but I don’t understand why operation [0] is used in the
ProtocolAppliedWaveletDelta message. So what is the reason for sending
operation [0] with an empty (?) document_operation?
2. How are the signature bytes within signature [0] calculated. I
didn’t find any detail algorithm for that calculation in the specs.
Can somebody give me a hint?
Thanxs in advance!
Regards
jowi
---- example wireshark trace message ---
<message>
type="normal"
from="wave.alice.org"
to="wave.bob.org"
id="Pr2XZsFY2fwAAAAAAAAABg=="
<request/>
xmlns="urn:xmpp:receipts"
<event>
xmlns="http://jabber.org/protocol/pubsub#event";
<items>
<item>
<wavelet-update>
xmlns="http://waveprotocol.org/protocol/0.2/
waveserver"
wavelet-name="wave://alice.org/w
+1di28cf3qaqhvA/conv+root"
<applied-delta>
(Comment: ProtocolAppliedWaveletDelta
message:)
signed_original_delta
delta
hashed_version
version: 3
history_hash:
3rbVBRWxFRI1DW3FF8DWakqDBoY=
author: [email protected]
operation[0]
mutate_document
document_id: b+14xxjhy4n8gzaB
document_operation
operation[1]
mutate_document
document_id: b+14xxjhy4n8gzaB
document_operation
component[0]
element_start
type: body
component[1]
element_start
type: line
component[2]
element_end: True
component[3]
characters: Hi Bob
component[4]
element_end: True
operation[2]
mutate_document
document_id: conversation
document_operation
component[0]
retain_item_count: 1
component[1]
element_start
type: blip
attribute[0]
key: id
value: b
+14xxjhy4n8gzaB
component[2]
element_end: True
component[3]
retain_item_count: 1
signature[0]
signature_bytes:
nPDCYVWFS+VrQzyqP3pK0VRyaj1Rdlj1Vwq9onyz
LTXi+FPQIvbtnoHW8nYf7WgioEFR9ZqwAe0UEcF0
cZ8vwCWLi/E2fTtHZoAGplcGuEgOrMHxw1FI6GZK
ettJ9HpWdJoxZaoqRSkSM03fz064Qp/mZhRM4Phj
XGSLnz+yV04=
signer_id:
+B5TmutRg83KRo4M74M7ydVpqeyPFSewyB2PNRW3zEs=
signature_algorithm: 1 ( SHA1_RSA )
hashed_version_applied_at
version: 3
history_hash:
3rbVBRWxFRI1DW3FF8DWakqDBoY=
operations_applied: 3
application_timestamp: 1284728564792
</applied-delta>
</wavelet-update>
</item>
</items>
</event>
</message>
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