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ThermalDOE's profile
ThermalDOE
ThermalDOE
ThermalDOE
@ThermalDOE

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ThermalDOE

@ThermalDOE

All about Apple Internal. Follow @PurpleSNIFF if you want to see my less important tweets. If you’d like to buy Apple Internal software, my DMs are always open!

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Joined July 2017

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    1. john‏ @nyan_satan Jun 15

      Overkill or not, but we got what we wanted - debug auth request (for a DVT iPhone 12 Pro Max, so latest SoC rev) and response (unsuccessful, of course) https://pastebin.com/KJmRxneF pic.twitter.com/8mp5KHCMny

      1 reply 0 retweets 7 likes
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    2. john‏ @nyan_satan Jun 15

      Most of the fields speak for themselves - Board ID, Chip ID, Security Domain, ECID, CPFM and nonce (doesn’t match with the APTicket nonce and is shorter) What “EnAppleDebugExternal” and “TicketIdentifier” mean is currently unknown to me

      1 reply 0 retweets 4 likes
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    3. john‏ @nyan_satan Jun 15

      Since now we know what request looks like, it would be also nice to know what proper response looks like. We tried to send the (pre-) EVT device’s data (the device is actually Proto2 btw), but wasn’t accepted. Apparently it never required the auth in the first place

      1 reply 0 retweets 3 likes
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    4. john‏ @nyan_satan Jun 15

      But hey, Tatsu wouldn’t be Tatsu if it didn’t allow more things with zeroed ECID! Let’s try this. And wow! It works https://pastebin.com/5v9sHgPu pic.twitter.com/Za0bL8lAbA

      1 reply 0 retweets 8 likes
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    5. john‏ @nyan_satan Jun 15

      Let’s decode the ticket from Base64. The result looks very much like an Image4 manifest (ASN.1)pic.twitter.com/KyjCbgYFL1

      1 reply 0 retweets 6 likes
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    6. john‏ @nyan_satan Jun 15

      Let’s decode it with OpenSSL. Apparently the ticket is split into 2 parts - IM4M (picture 1, without any Image4 hashes, obviously) and IM4C (picture 2, no idea what that is)pic.twitter.com/6omlsa5Tz0

      2 replies 0 retweets 8 likes
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    7. john‏ @nyan_satan Jun 15

      It’s currently unknown to me what happens with the ticket afterwards - whether it’s sent to a device in full, or something extracted from it first. Astris can probably answer this question, at least partially, but obviously requires more RE

      1 reply 0 retweets 5 likes
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    8. john‏ @nyan_satan Jun 15

      I also tried to change Chip ID in the request to other ones from 2020 lineup: T8103 (M1) T8301 (S6) Both returned success (with ECID 0, I mean), so it’s safe to assume these SoCs use the debug auth mechanism as well

      1 reply 0 retweets 7 likes
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    9. john‏ @nyan_satan Jun 15

      I also tried some new yet unreleased SoC - T6001 (cc. @never_released) and it returns success, too. Older Chip IDs (such as T8030) return error (94)

      1 reply 0 retweets 7 likes
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    10. john‏ @nyan_satan Jun 15

      Conclusions: 1) Debug auth is used since A14 (M1, S6), except for some early revisions (at least we could SWD/KIS into the A14 rev 00) 2) Future SoCs are gonna use it too 3) The end of prototype fun?

      2 replies 2 retweets 12 likes
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      ThermalDOE‏ @ThermalDOE Jun 15
      Replying to @nyan_satan

      RIP

      9:46 AM - 15 Jun 2021
      • 2 Likes
      • Mitchell Mebane 伏藏龙
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