From: Petr Gotthard <petr.gotthard at centrum.cz>
To: tpm2@lists.01.org
Subject: [tpm2] Hash sequence duplication without ContextSave/ContextLoad
Date: Mon, 16 May 2022 18:29:22 +0200 [thread overview]
Message-ID: <20220516182922.3BF1EB1D@centrum.cz> (raw)
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Hello,
I need to duplicate a hash sequence. This is to implement TPM-based version of OpenSSL's EVP_MD_CTX_dup.
Background: EVP_MD_CTX_dup can be used to duplicate the message digest state. This is useful [...] if large amounts of data are to be hashed which only differ in the last few bytes.
So far I am using ContextSave/ContextLoad, but Windows is blocking these TPM commands.
https://docs.microsoft.com/en-us/windows/win32/tbs/command-blocking
Is there some other way to duplicate a TPM hash sequence, please?
Petr
reply other threads:[~2022-05-16 16:29 UTC|newest]
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