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oe1cxw's profile
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen 🏳️‍⚧️🏳️‍🌈🧙🏻‍♀️ BLM 🏴🚩
Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩
@oe1cxw

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Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩

@oe1cxw

Neurodiverse trans geek girl. Yosys, RISC-V, SAT/SMT.

She/her/hers
clairexen.net
Joined September 2014

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    1. Andrew Zonenberg‏ @azonenberg 25 Jul 2018
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      Why are crypto/smartcard ICs (for example ATECC608) always so poorly documented / NDA-walled? The software/networking space is very open (TLS, IPSec, etc) and use of a proprietary cipher vs something like AES is massively frowned upon. So why is sec-by-obscurity OK in HW??

      9 replies 10 retweets 26 likes
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    2. Matthew Hardeman‏ @mdhardeman 25 Jul 2018
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      Replying to @azonenberg

      If you're willing to go under the constraints of the NDA and various business practices to get access, some of the secure ICs are quite well documented and even have decent tooling. But outside NDAs and approved paths for access, info is limited.

      2 replies 0 retweets 0 likes
    3. Andrew Zonenberg‏ @azonenberg 25 Jul 2018
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      Replying to @mdhardeman

      That was my point. I can buy some of these chips in qty 1 on digikey, but without any documentation for the host interface I can't use them. And I don't want to sign an NDA for an open-source project.

      2 replies 0 retweets 5 likes
    4. Matthew Hardeman‏ @mdhardeman 25 Jul 2018
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      Replying to @azonenberg

      It's not clear that signing the NDA and utilizing the chip in a real design would prevent you from producing open source software which utilizes the chip in your design. You just have to ensure every bit of what you code is strictly necessary to the design and don't explain.

      2 replies 0 retweets 2 likes
    5. Andrew Zonenberg‏ @azonenberg 25 Jul 2018
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      Replying to @mdhardeman

      Yes, but being under NDA would force you to not comment register writes, etc and generally produce poorly maintainable code. Unless you had a "secret" version of the code and then deleted the comments for the public copy.

      3 replies 1 retweet 3 likes
    6. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 26 Jul 2018
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      Replying to @azonenberg @mdhardeman

      If you have a "secret" version and only publish something with the comments removed then you are in violation of clause 2 of the open source definition, i.e. it is not open source anymore.

      2 replies 0 retweets 6 likes
    7. gojimmypi‏ @gojimmypi 26 Jul 2018
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      Replying to @oe1cxw @azonenberg @mdhardeman

      Interesting perspective. Are missing comments considered missing code in the spirit of "fully" open source? I wonder what @MicrochipTech has to say, given this conversation mentions their ECC608 crypto chip.

      1 reply 0 retweets 1 like
    8. Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 26 Jul 2018
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      Replying to @gojimmypi @azonenberg and

      lmgtfy https://opensource.org/osd pic.twitter.com/QTQw0wV33O

      1 reply 1 retweet 4 likes
    9. gojimmypi‏ @gojimmypi 26 Jul 2018
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      Replying to @oe1cxw @azonenberg and

      For example: clearly naming a register but simply not commenting what bit patterns are being stuffed or why... Is an open source violation? It's not obfuscated. It is the original, full source.

      2 replies 0 retweets 0 likes
      Claire Xen  🏳️‍⚧️ 🏳️‍🌈 🧙🏻‍♀️ BLM  🏴 🚩‏ @oe1cxw 26 Jul 2018
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      Replying to @gojimmypi @azonenberg and

      What? No! Please just *read* the text I quoted. If you have two versions of the code, one that you edit, and one that's generated from the first, then releasing just this generated code, not the one you'd edit, is not releasing the "source code" wrt OSD.

      8:45 AM - 26 Jul 2018
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        1. Andrew Zonenberg‏ @azonenberg 26 Jul 2018
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          Replying to @oe1cxw @gojimmypi and

          For example https://github.com/torvalds/linux/blob/master/drivers/crypto/atmel-ecc.c … is pretty sparsely commented, no reg definitions etc. Not sure if this is the official (lightly commented) source or redacted.

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        2. gojimmypi‏ @gojimmypi 26 Jul 2018
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          Replying to @oe1cxw @azonenberg and

          Yes, I did read it. Source code with or without comments should compile exactly the same. So you are saying that comments are source code? My only point is that it is an interesting question. 🙂

          2 replies 0 retweets 0 likes
        3. Marcus Müller‏ @dEnergy_dTime 26 Jul 2018
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          Replying to @gojimmypi @oe1cxw and

          It doesn't **matter** whether it compiles the same. Otherwise,it'd be open source if you deliver the LLVM IR assembly to your program.Compiles to the same machine bytecode (x86, ARM,…)! It's open source iff the code that you make public is the same code you work with. Full stop.

          1 reply 0 retweets 0 likes
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