Eran Messeri 90747ad701 Improve unique attestation docs & tests
Improve the documentation and tests related to device-unique
attestation on StrongBox KeyMint devices:
* Test that the chain produced is exactly of length 2.
* Document how the chain needs to be structured.
* Explain the trust properties of the key used for the
  self-signed root.

Test: atest VtsAidlKeyMintTargetTest
Bug: 187803288
Change-Id: I09bb16d6938b567c114485d2df00bde9d3e1ccf9
2021-05-27 18:19:18 +01:00
2021-03-18 23:28:58 +00:00
2021-03-18 23:28:58 +00:00
2019-12-13 14:24:23 -08:00
2021-05-12 20:43:21 +00:00
2016-08-30 11:28:36 -07:00
2020-12-16 18:09:12 +00:00
2021-01-21 15:06:51 +09:00
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