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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Dmitry Chestnykh‏ @dchest 29 Dec 2017
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      Dmitry Chestnykh Retweeted Hector Martin

      Sorry, this tweet is nonsense. The implementation is in assembly because people complain about crypto performance and to avoid side channels. Code was written by competent people who should implement crypto. Language is not "safe", it's safe against some mistakes, not logic bugs.https://twitter.com/marcan42/status/946252676781748224 …

      Dmitry Chestnykh added,

      Hector Martin @marcan42
      Your language may be "safe" and you may pass test vectors but reimplementing crypto is *still* a bad idea. https://twitter.com/daniel_bilar/status/946034680062730240 …
      1 reply 2 retweets 7 likes
    2. Hector Martin‏ @marcan42 29 Dec 2017
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      Replying to @dchest

      That's my point. The usual excuse for reinventing the wheel in your pet language (it's "safe"/native/whatever) is nonsense for crypto, because your biggest threat is implementation logic bugs like this one. Even competent people fuck up. Stick to well tested implementations.

      2 replies 2 retweets 0 likes
    3. Dmitry Chestnykh‏ @dchest 29 Dec 2017
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      Replying to @marcan42

      I'm not sure about that. There are much more buffer overflow or similar bugs than logic bugs.

      1 reply 0 retweets 0 likes
    4. Hector Martin‏ @marcan42 29 Dec 2017
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      Replying to @dchest

      Not in crypto code. Crypto code usually has very well defined input/output buffers with either completely fixed or completely arbitrary sizes.

      1 reply 0 retweets 0 likes
    5. Dmitry Chestnykh‏ @dchest 29 Dec 2017
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      Replying to @marcan42

      Crypto code is reimplemented when people discover new ways to attack it. We'd be stuck with non-constant-time implementations, ECDSA reusing randomness, unsafe RSA if we didn't reimplement it.

      1 reply 0 retweets 1 like
    6. Hector Martin‏ @marcan42 29 Dec 2017
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      Replying to @dchest

      None of those are "new ways to attack", they're (severe) bugs and a symptom that the code was written by someone not qualified to do so. You want *one* implementation done *right* so we can stop worrying about screwups like those.

      1 reply 0 retweets 0 likes
    7. This Tweet is unavailable.
      Hector Martin‏ @marcan42 30 Dec 2017
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      Replying to @alfiedotwtf @dchest

      Test suites are useless for crypto code. They wouldn't have caught this bug, or the ROCA bug, or side channel issues, or any of the really insidious potential problems.

      5:18 AM - 30 Dec 2017
      1 reply 0 retweets 0 likes
        1. This Tweet is unavailable.
        2. Hector Martin‏ @marcan42 30 Dec 2017
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          Replying to @alfiedotwtf @dchest

          It can't. Formal verification aside (which is an entire field on its own) you need human experts writing and reviewing the code. The good news is usually there is very little reason to *change* this code once it's been written.

          0 replies 0 retweets 0 likes
          3. End of conversation

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