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RichFelker's profile
Rich Felker
Rich Felker
Rich Felker
@RichFelker

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Rich Felker

@RichFelker

Yeah, I do @musllibc, FOSS & infosec stuff. But now is not the time for a mostly-/only-tech Twitter feed.

musl-libc.org
Joined March 2014

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    1. Damian Gryski‏ @dgryski 27 Dec 2017

      Remember that P-256 carry bug a while back from @FiloSottile/@thecomp1ler/@Cloudflare ? Here's the bug: https://github.com/golang/go/issues/20040 … And here's what happen when you get a single bit wrong in a crypto algorithm: https://events.ccc.de/congress/2017/Fahrplan/events/9021.html …

      4 replies 23 retweets 58 likes
      Show this thread
    2. Rich Felker‏ @RichFelker 27 Dec 2017
      Replying to @dgryski @Lukasaoz and

      This should never have happened because nobody except Cloudflare-like users has any need for asm crypto routines. Asm implementations should always be off-by-default.

      3 replies 0 retweets 1 like
    3. Rich Felker‏ @RichFelker 27 Dec 2017
      Replying to @RichFelker @dgryski and

      Either completely omitted at build time, or only used when crypto handle is opened with a "favor throughput over safety" option.

      1 reply 0 retweets 0 likes
    4. Cory Benfield‏ @Lukasaoz 27 Dec 2017
      Replying to @RichFelker @dgryski and

      That’s nonsense. Much crypto code requires constant time execution to avoid side channel attacks, and compilers cannot emit that code reliably at the moment.

      2 replies 0 retweets 1 like
    5. Rich Felker‏ @RichFelker 27 Dec 2017
      Replying to @Lukasaoz @dgryski and

      Sure they can. while(nanotime()<starttime+k);

      1 reply 0 retweets 0 likes
    6. Cory Benfield‏ @Lukasaoz 27 Dec 2017
      Replying to @RichFelker @dgryski and

      Ok, that answer so thoroughly misunderstands the problem that I think this just constitutes trolling.

      1 reply 0 retweets 2 likes
    7. Rich Felker‏ @RichFelker 27 Dec 2017
      Replying to @Lukasaoz @dgryski and

      How so? This is the ONLY safe & reliable way to achieve constant-time. Even most ISAs' machine code is not specified to guarantee constant time. Pretending asm can get it is wrong.

      2 replies 0 retweets 0 likes
    8. Cory Benfield‏ @Lukasaoz 27 Dec 2017
      Replying to @RichFelker @dgryski and

      I don’t think anyone is pretending: the ISA problems are well known, and largely considered deficiencies in those ISAs. My question to you is this: how do you select k?

      1 reply 0 retweets 0 likes
    9. Rich Felker‏ @RichFelker 27 Dec 2017
      Replying to @Lukasaoz @dgryski and

      Either just pick something huge, or measure over a largeish random set of ops & go a bit larger.

      3 replies 0 retweets 0 likes
      Rich Felker‏ @RichFelker 27 Dec 2017
      Replying to @RichFelker @Lukasaoz and

      "You must use one of a small # of bleeding-edge ISAs to do crypto safely" is not something I consider a viable position.

      7:05 PM - 27 Dec 2017
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Cory Benfield‏ @Lukasaoz 27 Dec 2017
          Replying to @RichFelker @dgryski and

          Fair enough, I can respect that. For me, “all crypto opts must take the maximum theoretical execution time on my device” is not a viable position either.

          1 reply 0 retweets 2 likes
        3. Rich Felker‏ @RichFelker 27 Dec 2017
          Replying to @Lukasaoz @dgryski and

          I actually have alternate possible solutions based on pseudo-const-time vm interp & const-time algorithms inside the vm, but also very costly.

          0 replies 0 retweets 0 likes
        4. End of conversation

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