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20 lines
1.1 KiB
Text
20 lines
1.1 KiB
Text
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@startuml
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participant TPM as T
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participant Client as C
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participant Server as S
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participant ServerSimTPM as ST
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title Three-message (1.5 round trips) attestation protocol w/ Proof-of-Possession
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C -> C: timestamp = gettimeofday();
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C --> T: TPM2_Quote(AK, set-of-all-PCRs, timestamp)
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T --> C: quote=Signed_AK({hash-of-PCRs, misc, timestamp})
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C -> S: [ID], EKpub, [EKcert], AKpub,\nPCRs, eventlog, timestamp, quote
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S -> S: check that timestamp is recent;\ndata = Lookup(EKpub, [EKcert], [ID]);\n[Validate(EKcert)];\ncompute PCRs hash from eventlog and PCRs;\nvalidate quote;\nsession_key = genkey();\nAKcert = CA_Certify(AKpub, data.ID, AKtbscert);\nstuff = Encrypt_session_key({AKcert,\n\t\t\t\t\tdata.for_client})
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S --> ST: TPM2_MakeCredential(EKpub, AKpub, session_key)
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ST --> S: credentialBlob, secret
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S -> C: credentialBlob, secret, stuff
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C --> T: TPM2_ActivateCredential(AKhandle, EKhandle,\n\t\t\t\t\tcredentialBlob, secret)
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T --> C: certInfo = session_key
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C -> C: {AKcert, secrets} =\n\t\tDecrypt_session_key(stuff);
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C -> S: {AKcert, PoP = Digest(AKcert)}
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@enduml
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