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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 "PolicyCounterTimer_fp.h"
#include "Policy_spt_fp.h"
//
//
// Error Returns Meaning
//
// TPM_RC_POLICY the comparison of the selected portion of the TPMS_TIME_INFO with
// operandB failed
// TPM_RC_RANGE offset + size exceed size of TPMS_TIME_INFO structure
//
TPM_RC
TPM2_PolicyCounterTimer(
PolicyCounterTimer_In *in // IN: input parameter list
)
{
TPM_RC result;
SESSION *session;
TIME_INFO infoData; // data buffer of TPMS_TIME_INFO
TPM_CC commandCode = TPM_CC_PolicyCounterTimer;
HASH_STATE hashState;
TPM2B_DIGEST argHash;
// Input Validation
// If the command is going to use any part of the counter or timer, need
// to verify that time is advancing.
// The time and clock vales are the first two 64-bit values in the clock
if(in->offset < sizeof(UINT64) + sizeof(UINT64))
{
// Using Clock or Time so see if clock is running. Clock doesn't run while
// NV is unavailable.
// TPM_RC_NV_UNAVAILABLE or TPM_RC_NV_RATE error may be returned here.
result = NvIsAvailable();
if(result != TPM_RC_SUCCESS)
return result;
}
// Get pointer to the session structure
session = SessionGet(in->policySession);
//If this is a trial policy, skip all validations and the operation
if(session->attributes.isTrialPolicy == CLEAR)
{
// Get time data info. The size of time info data equals the input
// operand B size. A TPM_RC_RANGE error may be returned at this point
result = TimeGetRange(in->offset, in->operandB.t.size, &infoData);
if(result != TPM_RC_SUCCESS) return result;
// Arithmetic Comparison
switch(in->operation)
{
case TPM_EO_EQ:
// compare A = B
if(CryptCompare(in->operandB.t.size, infoData,
in->operandB.t.size, in->operandB.t.buffer) != 0)
return TPM_RC_POLICY;
break;
case TPM_EO_NEQ:
// compare A != B
if(CryptCompare(in->operandB.t.size, infoData,
in->operandB.t.size, in->operandB.t.buffer) == 0)
return TPM_RC_POLICY;
break;
case TPM_EO_SIGNED_GT:
// compare A > B signed
if(CryptCompareSigned(in->operandB.t.size, infoData,
in->operandB.t.size, in->operandB.t.buffer) <= 0)
return TPM_RC_POLICY;
break;
case TPM_EO_UNSIGNED_GT:
// compare A > B unsigned
if(CryptCompare(in->operandB.t.size, infoData,
in->operandB.t.size, in->operandB.t.buffer) <= 0)
return TPM_RC_POLICY;
break;
case TPM_EO_SIGNED_LT:
// compare A < B signed
if(CryptCompareSigned(in->operandB.t.size, infoData,
in->operandB.t.size, in->operandB.t.buffer) >= 0)
return TPM_RC_POLICY;
break;
case TPM_EO_UNSIGNED_LT:
// compare A < B unsigned
if(CryptCompare(in->operandB.t.size, infoData,
in->operandB.t.size, in->operandB.t.buffer) >= 0)
return TPM_RC_POLICY;
break;
case TPM_EO_SIGNED_GE:
// compare A >= B signed
if(CryptCompareSigned(in->operandB.t.size, infoData,
in->operandB.t.size, in->operandB.t.buffer) < 0)
return TPM_RC_POLICY;
break;
case TPM_EO_UNSIGNED_GE:
// compare A >= B unsigned
if(CryptCompare(in->operandB.t.size, infoData,
in->operandB.t.size, in->operandB.t.buffer) < 0)
return TPM_RC_POLICY;
break;
case TPM_EO_SIGNED_LE:
// compare A <= B signed
if(CryptCompareSigned(in->operandB.t.size, infoData,
in->operandB.t.size, in->operandB.t.buffer) > 0)
return TPM_RC_POLICY;
break;
case TPM_EO_UNSIGNED_LE:
// compare A <= B unsigned
if(CryptCompare(in->operandB.t.size, infoData,
in->operandB.t.size, in->operandB.t.buffer) > 0)
return TPM_RC_POLICY;
break;
case TPM_EO_BITSET:
// All bits SET in B are SET in A. ((A&B)=B)
{
UINT32 i;
for (i = 0; i < in->operandB.t.size; i++)
if( (infoData[i] & in->operandB.t.buffer[i])
!= in->operandB.t.buffer[i])
return TPM_RC_POLICY;
}
break;
case TPM_EO_BITCLEAR:
// All bits SET in B are CLEAR in A. ((A&B)=0)
{
UINT32 i;
for (i = 0; i < in->operandB.t.size; i++)
if((infoData[i] & in->operandB.t.buffer[i]) != 0)
return TPM_RC_POLICY;
}
break;
default:
pAssert(FALSE);
break;
}
}
// Internal Data Update
// Start argument list hash
argHash.t.size = CryptStartHash(session->authHashAlg, &hashState);
// add operandB
CryptUpdateDigest2B(&hashState, &in->operandB.b);
// add offset
CryptUpdateDigestInt(&hashState, sizeof(UINT16), &in->offset);
// add operation
CryptUpdateDigestInt(&hashState, sizeof(TPM_EO), &in->operation);
// complete argument hash
CryptCompleteHash2B(&hashState, &argHash.b);
// update policyDigest
// start hash
CryptStartHash(session->authHashAlg, &hashState);
// add old digest
CryptUpdateDigest2B(&hashState, &session->u2.policyDigest.b);
// add commandCode
CryptUpdateDigestInt(&hashState, sizeof(TPM_CC), &commandCode);
// add argument digest
CryptUpdateDigest2B(&hashState, &argHash.b);
// complete the digest
CryptCompleteHash2B(&hashState, &session->u2.policyDigest.b);
return TPM_RC_SUCCESS;
}
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