Initial commit to seed TPM2.0 source code directory

LICENSE file text copied from TCG library specification. README
describes the procedure used to extract source code from parts 3 and 4
of the specification.

The python scripts and part{34}.txt files will be removed in the
following commits.

Change-Id: Ie281e6e988481831f33483053455e8aff8f3f75f
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>

1 files changed, 90 insertions, 0 deletions

diff --git a/PolicyPCR.c b/PolicyPCR.c
new file mode 100644
index 0000000..a9400fc
--- /dev/null
+++ b/PolicyPCR.c
@@ -0,0 +1,90 @@
+// 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 "PolicyPCR_fp.h"
+//
+//
+//     Error Returns                     Meaning
+//
+//     TPM_RC_VALUE                      if provided, pcrDigest does not match the current PCR settings
+//     TPM_RC_PCR_CHANGED                a previous TPM2_PolicyPCR() set pcrCounter and it has changed
+//
+TPM_RC
+TPM2_PolicyPCR(
+   PolicyPCR_In      *in                 // IN: input parameter list
+   )
+{
+   SESSION           *session;
+   TPM2B_DIGEST       pcrDigest;
+   BYTE               pcrs[sizeof(TPML_PCR_SELECTION)];
+   UINT32             pcrSize;
+   BYTE              *buffer;
+   TPM_CC             commandCode = TPM_CC_PolicyPCR;
+   HASH_STATE         hashState;
+
+// Input Validation
+
+   // Get pointer to the session structure
+   session = SessionGet(in->policySession);
+
+   // Do validation for non trial session
+   if(session->attributes.isTrialPolicy == CLEAR)
+   {
+       // Make sure that this is not going to invalidate a previous PCR check
+       if(session->pcrCounter != 0 && session->pcrCounter != gr.pcrCounter)
+           return TPM_RC_PCR_CHANGED;
+
+       // Compute current PCR digest
+       PCRComputeCurrentDigest(session->authHashAlg, &in->pcrs, &pcrDigest);
+
+       // If the caller specified the PCR digest and it does not
+       // match the current PCR settings, return an error..
+       if(in->pcrDigest.t.size != 0)
+       {
+           if(!Memory2BEqual(&in->pcrDigest.b, &pcrDigest.b))
+               return TPM_RC_VALUE + RC_PolicyPCR_pcrDigest;
+       }
+   }
+   else
+   {
+       // For trial session, just use the input PCR digest
+       pcrDigest = in->pcrDigest;
+   }
+// Internal Data Update
+
+   // Update policy hash
+   // policyDigestnew = hash(   policyDigestold || TPM_CC_PolicyPCR
+   //                      || pcrs || pcrDigest)
+   // Start hash
+   CryptStartHash(session->authHashAlg, &hashState);
+
+   // add old digest
+   CryptUpdateDigest2B(&hashState, &session->u2.policyDigest.b);
+
+  // add commandCode
+  CryptUpdateDigestInt(&hashState, sizeof(TPM_CC), &commandCode);
+
+  // add PCRS
+  buffer = pcrs;
+  pcrSize = TPML_PCR_SELECTION_Marshal(&in->pcrs, &buffer, NULL);
+  CryptUpdateDigest(&hashState, pcrSize, pcrs);
+
+  // add PCR digest
+  CryptUpdateDigest2B(&hashState, &pcrDigest.b);
+
+  // complete the hash and get the results
+  CryptCompleteHash2B(&hashState, &session->u2.policyDigest.b);
+
+  // update pcrCounter in session context for non trial session
+  if(session->attributes.isTrialPolicy == CLEAR)
+  {
+      session->pcrCounter = gr.pcrCounter;
+  }
+
+   return TPM_RC_SUCCESS;
+}