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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. Brian Smith‏ @BRIAN_____ 23 May 2017

      @_aead_ When is your paper going to be available?

      1 reply 0 retweets 0 likes
    2. Andreas Auernhammer‏ @_aead_ 23 May 2017
      Replying to @BRIAN_____

      Huh?! Maybe I missed something but I'm currently not writing any paper 😉- Do you mean the cswap SSE2 "trick"?

      1 reply 0 retweets 0 likes
    3. Brian Smith‏ @BRIAN_____ 23 May 2017
      Replying to @_aead_

      Yes. I thought you might be writing a paper after seeing your PRs and after seeing this: https://github.com/bitcoin-core/secp256k1/pull/457 ….

      1 reply 0 retweets 1 like
      Brian Smith‏ @BRIAN_____ 23 May 2017
      Replying to @BRIAN_____ @_aead_

      It'd be interesting to read a description of the trick. Is it something that is more generally applicable, e.g. to nistz256 or libsecp256k1?

      2:26 PM - 23 May 2017
      2 replies 0 retweets 0 likes
        1. New conversation
        2. Andreas Auernhammer‏ @_aead_ 23 May 2017
          Replying to @BRIAN_____

          Did not know this - thanks for sharing! Will take a look, but from just reading the abstract the SSE2 code could be a countermeasure...

          1 reply 0 retweets 1 like
        3. Andreas Auernhammer‏ @_aead_ 23 May 2017
          Replying to @_aead_ @BRIAN_____

          Okay may I've the time to write a little blogpost/similar about this 😉

          1 reply 0 retweets 1 like
        4. Andreas Auernhammer‏ @_aead_ 23 May 2017
          Replying to @_aead_ @BRIAN_____

          Looks like Vlad's Go P256 amd64 implementation does something similar: https://github.com/golang/go/blob/master/src/crypto/elliptic/p256_asm_amd64.s#L73 …

          0 replies 0 retweets 0 likes
        5. End of conversation
        1. Andreas Auernhammer‏ @_aead_ 23 May 2017
          Replying to @BRIAN_____

          @aead Okay, didn't looked at the NIST curves, but I think the same trick can be used there as well... I'll look at some implementations...

          0 replies 0 retweets 0 likes
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