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BRIAN_____'s profile
Brian Smith
Brian Smith
Brian Smith
@BRIAN_____

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Brian Smith

@BRIAN_____

Code farmer. Security, crypto, performance, networking, usability. Rust, C++, C, Haskell, DSLs, etc. *ring*, webpki, crypto-bench, mozilla::pkix.

Honolulu & San Francisco
briansmith.org
Joined April 2008

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    1. Alexis Beingessner‏ @Gankro 23 Nov 2016
      Replying to @Gankro @BRIAN_____ @ManishEarth

      so basically you also need to get a shrink_to_fit in there.

      2 replies 0 retweets 0 likes
    2. Alexis Beingessner‏ @Gankro 23 Nov 2016
      Replying to @Gankro @BRIAN_____ @ManishEarth

      that's convoluted enough that I think it's reasonable to say "this isn't a significant concern in practice"

      2 replies 0 retweets 0 likes
    3. Brian Smith‏ @BRIAN_____ 23 Nov 2016
      Replying to @Gankro @ManishEarth

      Perhaps. But I came up with these two in a few minutes during this chat. Almost definitely there are others.

      1 reply 0 retweets 1 like
    4. Brian Smith‏ @BRIAN_____ 23 Nov 2016
      Replying to @BRIAN_____ @Gankro @ManishEarth

      This makes me think that the unique-key-per-HashMap is fragile and so likely not a security mechanism to be relied on.

      1 reply 0 retweets 2 likes
    5. Alexis Beingessner‏ @Gankro 23 Nov 2016
      Replying to @BRIAN_____ @ManishEarth

      this leaves only two solutions: tree fallback, or educate the world that hashmaps shouldn't *store* untrusted input

      1 reply 0 retweets 0 likes
    6. Alexis Beingessner‏ @Gankro 23 Nov 2016
      Replying to @Gankro @BRIAN_____ @ManishEarth

      I personally live in a fuzzier world, where it's ok to apply minor mitigations as long as the perf impact is low

      2 replies 0 retweets 0 likes
    7. Brian Smith‏ @BRIAN_____ 23 Nov 2016
      Replying to @Gankro @ManishEarth

      If you could look at recent comments in the GitHub issues, you'd see suggestions about adding custom HMAC-SipHash, etc.

      2 replies 0 retweets 0 likes
    8. Alexis Beingessner‏ @Gankro 23 Nov 2016
      Replying to @BRIAN_____ @ManishEarth

      wut

      1 reply 0 retweets 0 likes
    9. Brian Smith‏ @BRIAN_____ 23 Nov 2016
      Replying to @Gankro @ManishEarth

      That's what I said!

      1 reply 0 retweets 0 likes
    10. Alexis Beingessner‏ @Gankro 23 Nov 2016
      Replying to @BRIAN_____ @ManishEarth

      link?

      1 reply 0 retweets 0 likes
      Brian Smith‏ @BRIAN_____ 23 Nov 2016
      Replying to @Gankro @ManishEarth

      https://github.com/rust-lang/rfcs/pull/1666#issuecomment-255353005 …

      6:51 PM - 23 Nov 2016
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Alexis Beingessner‏ @Gankro 23 Nov 2016
          Replying to @BRIAN_____ @ManishEarth

          just seems like one guy kicking up shit about SipHash tbh (I only skimmed his arguments, seem kinda confused).

          1 reply 0 retweets 0 likes
        3. Alexis Beingessner‏ @Gankro 23 Nov 2016
          Replying to @Gankro @BRIAN_____ @ManishEarth

          50% certain that @veorq can easily dismiss their concerns

          1 reply 0 retweets 0 likes
        4. JP Aumasson‏ @veorq 24 Nov 2016
          Replying to @Gankro @BRIAN_____ @ManishEarth

          SipHash is a *keyed hash*, aka pseudorandom function (PRF), not a keyless hash like SHA3 or BLAKE2

          0 replies 0 retweets 0 likes
        5. End of conversation

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