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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. Hector Martin‏ @marcan42 27 Dec 2017
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      Hector Martin Retweeted Daniel Bilar

      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 …

      Hector Martin added,

      Daniel Bilar @daniel_bilar
      Go impl of the P-256 ECC had small bug due to a misplaced carry bit affecting <0.00000003% of field subtraction ops. Filippo and co. built a full practical key recovery attack on top of it, capable of targeting JSON Web Encryption https://twitter.com/jilles_com/status/946016218900819968 … https://twitter.com/FiloSottile/status/932677074975936513 …
      4 replies 50 retweets 107 likes
    2. Davor Cubranic‏ @OddsAndBits 29 Dec 2017
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      Replying to @marcan42 @thatcks

      The “safe” language where the bug was is x86-64 assembly.

      1 reply 0 retweets 0 likes
    3. Hector Martin‏ @marcan42 29 Dec 2017
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      Replying to @OddsAndBits @thatcks

      My point is that a language being "safe" (which is often used as an excuse to reinvent all the wheels in a given language) is a bad excuse when crypto mistakes (like this one) will happen in any language (the bug was a logic bug).

      1 reply 0 retweets 0 likes
    4. Davor Cubranic‏ @OddsAndBits 30 Dec 2017
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      Replying to @marcan42 @thatcks

      Then say “don’t reinvent crypto”, which anyone would agree with. Don’t use Go’s visibility for a cheap shot and blabber about a safe language when the carry error was caused by the add in assembly.

      1 reply 0 retweets 1 like
      Hector Martin‏ @marcan42 30 Dec 2017
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      Replying to @OddsAndBits @thatcks

      It's a cultural problem. Go reinvents *everything*. And then it winds up reinventing crypto.

      9:06 AM - 30 Dec 2017
      0 replies 0 retweets 0 likes

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