[tpm2] Schema of object.json

[tpm2] Schema of object.json

[Anthony Arrascue]

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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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