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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. Who ordered *that*?‏ @ManishEarth 12 Jul 2017
      Replying to @ManishEarth

      I'd love to understand what exactly you didn't like about my statements.

      1 reply 0 retweets 0 likes
    2. friend void‏ @volatile_void 12 Jul 2017
      Replying to @ManishEarth

      They refer to third-party statements I have not personally encountered, so I may be of, but it seems to me that you are conflating 2 things…

      1 reply 0 retweets 1 like
    3. friend void‏ @volatile_void 12 Jul 2017
      Replying to @volatile_void @ManishEarth

      1- verifying the full functional correctness of a piece of C code, including absence of UB 2- verifying the absence of UB

      1 reply 0 retweets 0 likes
    4. friend void‏ @volatile_void 12 Jul 2017
      Replying to @volatile_void @ManishEarth

      1 is more expensive than rewriting (presumably in Rust?), but it's not the same thing as rewriting in Rust, it gives you more.

      2 replies 0 retweets 0 likes
    5. friend void‏ @volatile_void 12 Jul 2017
      Replying to @volatile_void @ManishEarth

      2 can have a price comparable to rewriting in Rust, depending on coding style and subtlety of verified code. Many trade-offs…

      2 replies 0 retweets 0 likes
    6. friend void‏ @volatile_void 12 Jul 2017
      Replying to @volatile_void @ManishEarth

      friend void Retweeted Who ordered *that*?

      In particular, it needn't imply writing tons of specifications. So I totally disagree with this tweet:https://twitter.com/ManishEarth/status/885184757633392640 …

      friend void added,

      Who ordered *that*? @ManishEarth
      Replying to @ManishEarth
      You *do* understand that formal verification is basically another kind of rewrite, yes? One in an even less ergonomic language.
      2 replies 0 retweets 0 likes
    7. friend void‏ @volatile_void 12 Jul 2017
      Replying to @volatile_void @ManishEarth

      On the other side, what's a good project to show that rewriting in Rust is feasible? https://github.com/briansmith/ring  ? Last time I checks Ring still

      2 replies 0 retweets 0 likes
    8. friend void‏ @volatile_void 12 Jul 2017
      Replying to @volatile_void @ManishEarth

      used some C functions. Unless there are better data points than Ring, I have to conclude that rewriting in Rust is expensive too.

      1 reply 0 retweets 0 likes
    9. Who ordered *that*?‏ @ManishEarth 12 Jul 2017
      Replying to @volatile_void

      No, the intent of Ring is to rewrite all the C in Rust except for the constant time crypto (which is asm+C).

      2 replies 0 retweets 0 likes
    10. Brian Smith‏ @BRIAN_____ 12 Jul 2017
      Replying to @ManishEarth

      The goal with *ring* is to help other projects write Rust code by providing a reasonable Rust API. Not so much to implement *ring* in Rust.

      1 reply 0 retweets 2 likes
      Brian Smith‏ @BRIAN_____ 12 Jul 2017
      Replying to @BRIAN_____ @ManishEarth

      The oxidation work we did does have some clear benefits, but also some of the projects using verified C w/ CompCert are very compelling.

      11:53 PM - 12 Jul 2017
      • 1 Like
      • Who ordered *that*?
      1 reply 0 retweets 1 like
        1. New conversation
        2. Brian Smith‏ @BRIAN_____ 12 Jul 2017
          Replying to @BRIAN_____ @ManishEarth

          Also, many important rewrites don't look like rewrites. For example, in some sense Caddy is a rewrite of Apache in Go. Actually, it's more.

          1 reply 0 retweets 1 like
        3. Brian Smith‏ @BRIAN_____ 13 Jul 2017
          Replying to @BRIAN_____ @ManishEarth

          We used BoringSSL's C code & gradually rewrote in Rust b/c I thought there'd be demand for TLS in Rust in 2015. Wrong. Maybe good marketing.

          1 reply 0 retweets 2 likes
        4. Brian Smith‏ @BRIAN_____ 13 Jul 2017
          Replying to @BRIAN_____ @ManishEarth

          In retrospect, it would have been more efficient—higher throughput, higher latency—to take the asm code and start from scratch w/ the rest.

          0 replies 1 retweet 2 likes
        5. End of conversation

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