Hello. my name is Donald Small and I am doing research at Johns Hopkins
University This summer. I am currently working with the TPM and having a
few difficulties.
I have a system based on the XEN hypervisor in which Dom0 works as a
trusted forwarder. One or more virtual machines contact Dom0 which signs
messages with the TPM and sends out to other clients on the network.
The problem I am facing is I want to use a custom hash function that can be
shared between the virtual machines and Dom0 because the virtual machines
have no access to the TPM. I have been following the documentation created
by IBM called "A Practical Guide to Trusted Computing" and I have installed
Trouser software and tpm-tools for Ubuntu 12.04.
After running the following code I get a TSS_E_BAD_PARAMETER error, "Error
in Tspi_Hash_Sign: One or more parameter is bad".
BYTE *digest = "b2cad21e87dbd57f1a1928e4013b56fb553bb82a";
UINT32 digestLen = sizeof(digest);
/* Create a hash object as type other */
result = Tspi_Context_CreateObject(hContext, TSS_OBJECT_TYPE_HASH,
TSS_HASH_OTHER, &hHash);
/* Set the hash value */
result = Tspi_Hash_SetHashValue(hHash, digestLen,digest);
/* Sign the hash */
result = Tspi_Hash_Sign(hHash, hKey, &signatureLen, &signature);
I also tried the approach to set the OID of the hash function and still had
the same error. I am attempting to use the md5 hash algorithm.
BYTE *oid = "1.2.840.113549.2.5"; //md5
UINT32 idLen = sizeof(oid);
/* Set the hash algorithm type */
Tspi_SetAttribData(hHash, TSS_TSPATTRIB_ALG_IDENTIFIER, 0, oidLen,
oid);
print_error(result, "Tspi_SetAttribData");
I would greatly appreciate if you could advise me to where I may be having
a problem.
Thank you in advance. Best Regards,
Donald Small Jr.
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