[tpm2] Re: Schema of object.json

[Anthony Arrascue <AArrascue at neuroloop.de>]

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Hi David,
Thank you for your reply. Do you know if I can find documentation about this?

I found what I believe is the serialization / deserialization of those JSON objects:
https://github.com/tpm2-software/tpm2-tss/blob/04a2853994eb31747c3e19c2601d99e675067794/src/tss2-fapi/ifapi_json_serialize.c
https://github.com/tpm2-software/tpm2-tss/blob/04a2853994eb31747c3e19c2601d99e675067794/src/tss2-fapi/ifapi_json_deserialize.c

But this encryption process of the PrivK, with the PubKey of the SRK is then somewhere else?

Best,
Anthony


From: David Challener <david.c.challener(a)gmail.com>
Sent: Tuesday, 16 November 2021 16:56
To: Anthony Arrascue <AArrascue(a)neuroloop.de>
Subject: Re: [tpm2] Schema of object.json

I expect the private key is the encrytion of the real private key with the srk oublic key.

On Tue, Nov 16, 2021, 9:31 AM Anthony Arrascue <AArrascue(a)neuroloop.de<mailto:AArrascue(a)neuroloop.de>> wrote:
Hello,

I am using TPM2-TSS v. 2.4.x and TPM2-TOOLS v. 4.X.

Let’s suppose I create a key running:
tss2_createkey --path=HS/SRK/MyKey --type="sign,noDa,decrypt,system" --authValue=blabla

This creates a folder MyKey in […]/keystore/P_RSA2048SHA256/HS/SRK/MyKey and a file object.json inside.
I was wondering what the public / private keys are?

public":{
    "size":278,
    "publicArea":{…},
     …    "unique":"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"
    }
  },
…
  "serialization":"",
"private":"00201f93bbec6eb3d00f08cb8cafd48dffe6b06150fa45b989072922b2049c962de80010baf3c7683d5039a27cb73036531a869137bc3a57d30b8c348b73ce134eb11066e45803e5ee7bba20192ab4f6881b21004261ab06af37c68a22758284d9d21fc91d49748f6eee1bc8f1011d0e4fd228642e98f3ee65a4161d1cc53af6b0dfb48aafc9cefde1ca8212b08e16b4c15d0a16adc36b19133350f73bace6f12d11c084d9eb953cf9c87d0a2f2b34617a2369ffc9fb299113bba531d9be465e033ec54511cf6b6e3463e84018e40eaded1fa6ad13da671946cd03a567f3",
…

Questions: what is the meaning of the “unique” and “private” keys?
Is there a place where a schema can be found for a key?
The private part cannot be the private key right? It would not make sense that this is stored as plain text.

Thank you very much for any help.
Best,
Anthony Arrascue


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