XSF Discussion - 2019-06-25

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Yagiza 04:49:40
Daniel, are you here?
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Daniel 05:30:27
Yagiza: yes
Yagiza 05:33:32
Daniel, I need to clarify something about OMEMO implementation. Can you help me?
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Daniel 05:41:44
Yagiza: I don't know. But we can try
Yagiza 05:43:23
Daniel, ok, thanx!
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Yagiza 06:22:55
Section 4.3 says, that I must publish my IdentityKey. But IdentityKey is a public/private key pair.
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Yagiza 06:25:41
Do I need to publish both keys, or just public one?
Daniel 06:27:30
The public key
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Yagiza 06:40:10
Daniel, ok. That's the way I did it.
Yagiza 06:41:01
Daniel, the only question is why tag name is so ambiguous.
Yagiza 06:42:23
<signedPreKeyPublic/>, <preKeyPublic/>, but <identityKey/>?
Yagiza 06:43:49
The next question is about section 4.5.
Yagiza 06:46:55
It says: "In order to send a chat message, its <body> first has to be encrypted. The client MUST use fresh, randomly generated key/IV pairs with AES-128 in Galois/Counter Mode (GCM). The 16 bytes key and the GCM authentication tag (The tag SHOULD have at least 128 bit) are concatenated and for each intended recipient device, i.e. both own devices as well as devices associated with the contact, the result of this concatenation is encrypted using the corresponding long-standing SignalProtocol session."
Yagiza 06:47:57
What does that mean? How to encrypt, "using the corresponding long-standing SignalProtocol session"?
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Yagiza 06:50:03
Do I need to use one of pre keys, published by target devices to encrypt key I just generated?
Yagiza 06:52:00
Or do I need to use it just for a first message and mark it with preKey="true" attribute?
Yagiza 06:53:16
And one I received a key/IV pair from the device, I need to use that key instead?
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flow 06:57:16
dwd, hmm?
dwd 06:58:13
flow, You referred to SCE as SEC in your mail to standards@. I'm disproportionately amused.
flow 06:59:31
Ahh, I see.
Daniel 06:59:32
Yagiza: you generate a random iv+key, encrypt the message with that key. And then you feed the key into all signal protocol session
Daniel 06:59:46
And if no session exists yet you create them
Daniel 06:59:57
With prekeys downloaded from pep
Yagiza 07:01:14
Daniel, well... What does it mean "to create a session"?
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Daniel 07:01:37
That is defined by the signal spec
Yagiza 07:01:43
Ok
Ge0rG 07:03:05
I actually like SEC much more than SCE, with you-know-what as a close second. Can't we change the title to "Stanza Encrypted Content" at least? 😁
Yagiza 07:03:45
The next question is: which functions from libsignal-protocol-c do I need to use to generate key/IV pair? Those from sender_key.h?
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Daniel 07:06:15
They are not provided by the library. It's just random bytes
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Yagiza 07:10:17
Daniel, IC. And which function can I use to encrypt my message using that key/IV pair?
Daniel 07:11:11
Some aes gcm implementation
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Yagiza 07:12:46
Daniel, ok
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COM8 13:11:00
Yagiza: I also had quite a few problems understanding the OMEMO XEP. If you need a working example with documentation look at: https://github.com/UWPX/UWPX-Client/blob/master/XMPP_API/Classes/Network/XML/Messages/XEP-0384/OmemoMessageMessage.cs
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Daniel 13:27:08
there is also https://wiki.xmpp.org/web/Tech_pages/OMEMO which can be interesting to people implementing omemo
Daniel 13:27:31
it doesn’t answer the specfic questions Yagiza had. but _other_ questions
Yagiza 13:28:02
COM8, Daniel, thanx!
Daniel 13:28:03
would be interesting to know what problems you COM8 ran into so we can mention it on the tech pages or elsewhere
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vanitasvitae 13:38:15
Yagiza: for which client are you doing your implementation?
Yagiza 13:39:17
vanitasvitae, eyeCU.
COM8 13:40:36
It were some general problems with understanding What the XEP wants from me and which parts comes from libsignal and how it is used in combination with OMEMO. Quiet abstract without a concrete example - at least for me. I had planned to create a PR with changes to the wording and adding some more examples but on the Sprint in Berlin I was talking to people which mentioned there would be some planed changes to the XEP so I will wait until they have been merged before I start updating it.
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Yagiza 13:48:59
COM8, ok
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pep. 14:59:40
COM8, I don't think these changes are coming soon tbh, most of them might be breaking from what I understand. So if yours are cosmetic, do PR
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COM8 15:09:08
pep: Ok thanks for the information - will start working on it.
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COM8 16:08:38
Is it only me or is somebody else getting duplicate messages in here since ~3 days
Ge0rG 16:08:50
COM8: must be you
Ge0rG 16:08:56
COM8: must be you
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COM8 16:09:08
Ok 🤔
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jonas’ 16:18:02
Ge0rG, you troll.
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Ge0rG 16:22:01
SCNR
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lovetox 17:20:53
You have to understand the signal protocol and librarys that implement it first
lovetox 17:21:13
~~then you read the XEP and learn how you can wrap that for xmll~~ ✎
lovetox 17:21:16
then you read the XEP and learn how you can wrap that for xmpp ✏
lovetox 17:22:34
RFCs for xmpp also dont describe how TLS works, you have to understand what TLS is, that there are librarys for it, how to use these librarys, and then you read the XMPP RFC, on how to use it in context of XMPP
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lovetox 17:23:39
So yes if you have no idea what the signal protocol is and how to use the librarys and expect the XEP tells you all that, this will not work out
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Yagiza 18:36:54
Daniel, so, I use Signal Protocol session to encrypt key/IV pair instead of messagea. And messages themself are encrypted with that key/IV pair, which a generate randomly right?
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Daniel 18:39:16
Yes
Daniel 18:39:23
The IV isn't encrypted. But yes
Yagiza 18:40:27
Daniel, so, then.. what is GCM authentication tag, whih I need to concatenated with a key?
Daniel 18:42:38
Yagiza: your gcm library will either give that to you or append that to the cipher text
Yagiza 18:42:56
Daniel, IC.
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