Hi,
I am trying to use an AIK for signing an SHA-1 hash. It is my understanding
that the signing process inside Tspi expects a 20 byte value for signing
(size of SHA-1) and the hash object to be of type TSS_HASH_OTHER.
Unfortunately whenever I try to sign a SHA-1 hash value with an AIK key, I
get an "Invalid key usage" error. If I switch to a signing key, everything
works as expected. Can the AIK be used to sign external SHA-1 hashes, or is
it a limited key that only signs CertifyKey data and Quote data?
Thanks.
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