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[12:26:09] <Hermitifier> Hello.
[12:26:35] <Hermitifier> I've got question regarding XEP-0115 again.
[12:26:40] <louiz’> ask
[12:26:44] <Hermitifier> What would be exactly the implementation difference, between 5.4.2.3 - unsupported hash function, and 5.4.3.9 - reconstructed hash mismatch ?
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[15:33:22] <Zash> Hermitifier: In the later, you can be sure if the hash is wrong. If it's a hash function you don't support, you can't know that.
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[15:52:44] <Hermitifier> Zash: And are those two different? In both situations the result is not to be globally cached.
[15:54:37] <Hermitifier> And as you said, most often "the hash is wrong", not the result itself, even if XEP says it must be considered invalid.
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[16:07:32] <darkrain_> A hash being invalid, as opposed to unvalidated, suggests either a programming error (ideally caught before an app is put into production -- realistically not so much) or a proper poisoning attack.
[16:07:41] <darkrain_> (or a spec bug)
[16:07:57] <darkrain_> Unvalidated is just "*shrug*, I don't support that hash function"
[16:08:01] <Zash> Hermitifier: At least log("Someone is using the %s hash, but we don't support that :(", c.attr.hash); vs log("Client foo is doing caps wrong, someone should tell them to fix it")
[16:08:23] <darkrain_> Yeah, in reality, a log message is pretty much the only difference there
[16:08:58] <Zash> Is there even anyone doing anything but sha1 yet?
[16:09:23] <Hermitifier> Tkabber does also md5.
[16:09:31] <darkrain_> Ewww, talk about the wrong direction.
[16:10:02] <Zash> Version 1.5 (2008-02-26) Defined SHA-1 as mandatory to implement
[16:10:12] <darkrain_> An implementation MAY support other algorithms. Any such algorithm SHOULD be registered in the IANA Hash Function Textual Names Registry <http://www.iana.org/assignments/hash-function-text-names> [24 <http://xmpp.org/extensions/xep-0115.html#nt-id188769>]. In the future, the XMPP Council <http://xmpp.org/council/> [25 <http://xmpp.org/extensions/xep-0115.html#nt-id188805>] may, at its discretion, modify the mandatory-to-implement hashing algorithm if it determines that SHA-1 has become practically vulnerable to Preimage Attacks <http://xmpp.org/extensions/xep-0115.html#security-preimage>.
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