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// This file was extracted from the TCG Published
// Trusted Platform Module Library
// Part 3: Commands
// Family "2.0"
// Level 00 Revision 01.16
// October 30, 2014
#include "InternalRoutines.h"
#include "PolicyCpHash_fp.h"
//
//
// Error Returns Meaning
//
// TPM_RC_CPHASH cpHash of policySession has previously been set to a different value
// TPM_RC_SIZE cpHashA is not the size of a digest produced by the hash algorithm
// associated with policySession
//
TPM_RC
TPM2_PolicyCpHash(
PolicyCpHash_In *in // IN: input parameter list
)
{
SESSION *session;
TPM_CC commandCode = TPM_CC_PolicyCpHash;
HASH_STATE hashState;
// Input Validation
// Get pointer to the session structure
session = SessionGet(in->policySession);
// A new cpHash is given in input parameter, but cpHash in session context
// is not empty, or is not the same as the new cpHash
if( in->cpHashA.t.size != 0
&& session->u1.cpHash.t.size != 0
&& !Memory2BEqual(&in->cpHashA.b, &session->u1.cpHash.b)
)
return TPM_RC_CPHASH;
// A valid cpHash must have the same size as session hash digest
if(in->cpHashA.t.size != CryptGetHashDigestSize(session->authHashAlg))
return TPM_RC_SIZE + RC_PolicyCpHash_cpHashA;
// Internal Data Update
// Update policy hash
// policyDigestnew = hash(policyDigestold || TPM_CC_PolicyCpHash || cpHashA)
// Start hash
CryptStartHash(session->authHashAlg, &hashState);
// add old digest
CryptUpdateDigest2B(&hashState, &session->u2.policyDigest.b);
// add commandCode
CryptUpdateDigestInt(&hashState, sizeof(TPM_CC), &commandCode);
// add cpHashA
CryptUpdateDigest2B(&hashState, &in->cpHashA.b);
// complete the digest and get the results
CryptCompleteHash2B(&hashState, &session->u2.policyDigest.b);
// update cpHash in session context
session->u1.cpHash = in->cpHashA;
session->attributes.iscpHashDefined = SET;
return TPM_RC_SUCCESS;
}
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