68 lines
2.1 KiB
C
68 lines
2.1 KiB
C
// 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;
|
|
}
|