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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. Hector Martin‏ @marcan42 29 Dec 2017
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      Replying to @marcan42 @dchest

      The corollary is that languages with poor FFI/binding support and thus a culture of wheel reinvention (like Go) are at a higher risk of security issues when crypto is is inevitably reimplemented as a result, regardless of how competent the implementors are.

      2 replies 0 retweets 0 likes
    4. Damian Gryski‏ @dgryski 29 Dec 2017
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      Replying to @marcan42 @dchest

      How does this play into the "crypto library monoculture is bad" theory? Clearly there's a market for things that aren't OpenSSL.

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

      The problem with OpenSSL is that it's not (only) a crypto library, it's a kitchen sync of crap mixing low and high level code. Sure, we're better off implementing a PKI and TLS in a safe language, but there isn't a market for more than one or two *good* crypto primitive libs.

      1 reply 0 retweets 0 likes
    6. Damian Gryski‏ @dgryski 29 Dec 2017
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      Replying to @marcan42 @dchest

      S2n from @amazon , mbedTLS from @Arm , plus the boring/libre/OpenSSL family and nss from @mozilla and friends only scratches the surface. I agree there are too many, but possibly two is too few..

      1 reply 0 retweets 0 likes
      Hector Martin‏ @marcan42 29 Dec 2017
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      Replying to @dgryski @dchest and

      Yeah, but all of those are big libs that do lots of stuff. Among them, how many times are the same *primitives* implemented? You usually only need *two* versions: the fast one, and the comprehensible/short one. Within the fast one you need optimized assembly for N architectures.

      4:32 PM - 29 Dec 2017
      1 reply 0 retweets 0 likes
        1. Damian Gryski‏ @dgryski 29 Dec 2017
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          Replying to @marcan42 @dchest and

          Ah yes. Depends on where you draw the line at the protocol level. I'd say higher level bugs are more common than issues with the primitives, and so your "base library" would need a larger set of stuff.

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