/********************************************************************************/
/*										*/
/*			Managing and accessing the hierarchy-related values   	*/
/*			     Written by Ken Goldman				*/
/*		       IBM Thomas J. Watson Research Center			*/
/*            $Id: Hierarchy.c 1490 2019-07-26 21:13:22Z kgoldman $		*/
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/********************************************************************************/
/* 8.3 Hierarchy.c */
/* 8.3.1 Introduction */
/* This file contains the functions used for managing and accessing the hierarchy-related values. */
/* 8.3.2 Includes */
#include "Tpm.h"
/* 8.3.3 Functions */
/* 8.3.3.1 HierarchyPreInstall() */
/* This function performs the initialization functions for the hierarchy when the TPM is
   simulated. This function should not be called if the TPM is not in a manufacturing mode at the
   manufacturer, or in a simulated environment. */
void
HierarchyPreInstall_Init(
			 void
			 )
{
    // Allow lockout clear command
    gp.disableClear = FALSE;
    // Initialize Primary Seeds
    gp.EPSeed.t.size = sizeof(gp.EPSeed.t.buffer);
    gp.SPSeed.t.size = sizeof(gp.SPSeed.t.buffer);
    gp.PPSeed.t.size = sizeof(gp.PPSeed.t.buffer);
#if (defined USE_PLATFORM_EPS) && (USE_PLATFORM_EPS != NO)
    _plat__GetEPS(gp.EPSeed.t.size, gp.EPSeed.t.buffer);
#else
    CryptRandomGenerate(gp.EPSeed.t.size, gp.EPSeed.t.buffer);
#endif
    CryptRandomGenerate(gp.SPSeed.t.size, gp.SPSeed.t.buffer);
    CryptRandomGenerate(gp.PPSeed.t.size, gp.PPSeed.t.buffer);
    // Initialize owner, endorsement and lockout authorization
    gp.ownerAuth.t.size = 0;
    gp.endorsementAuth.t.size = 0;
    gp.lockoutAuth.t.size = 0;
    // Initialize owner, endorsement, and lockout policy
    gp.ownerAlg = TPM_ALG_NULL;
    gp.ownerPolicy.t.size = 0;
    gp.endorsementAlg = TPM_ALG_NULL;
    gp.endorsementPolicy.t.size = 0;
    gp.lockoutAlg = TPM_ALG_NULL;
    gp.lockoutPolicy.t.size = 0;
    // Initialize ehProof, shProof and phProof
    gp.phProof.t.size = sizeof(gp.phProof.t.buffer);
    gp.shProof.t.size = sizeof(gp.shProof.t.buffer);
    gp.ehProof.t.size = sizeof(gp.ehProof.t.buffer);
    CryptRandomGenerate(gp.phProof.t.size, gp.phProof.t.buffer);
    CryptRandomGenerate(gp.shProof.t.size, gp.shProof.t.buffer);
    CryptRandomGenerate(gp.ehProof.t.size, gp.ehProof.t.buffer);
    // Write hierarchy data to NV
    NV_SYNC_PERSISTENT(disableClear);
    NV_SYNC_PERSISTENT(EPSeed);
    NV_SYNC_PERSISTENT(SPSeed);
    NV_SYNC_PERSISTENT(PPSeed);
    NV_SYNC_PERSISTENT(ownerAuth);
    NV_SYNC_PERSISTENT(endorsementAuth);
    NV_SYNC_PERSISTENT(lockoutAuth);
    NV_SYNC_PERSISTENT(ownerAlg);
    NV_SYNC_PERSISTENT(ownerPolicy);
    NV_SYNC_PERSISTENT(endorsementAlg);
    NV_SYNC_PERSISTENT(endorsementPolicy);
    NV_SYNC_PERSISTENT(lockoutAlg);
    NV_SYNC_PERSISTENT(lockoutPolicy);
    NV_SYNC_PERSISTENT(phProof);
    NV_SYNC_PERSISTENT(shProof);
    NV_SYNC_PERSISTENT(ehProof);
    return;
}
/* 8.3.3.2 HierarchyStartup() */
/* This function is called at TPM2_Startup() to initialize the hierarchy related values. */
BOOL
HierarchyStartup(
		 STARTUP_TYPE     type           // IN: start up type
		 )
{
    // phEnable is SET on any startup
    g_phEnable = TRUE;
    // Reset platformAuth, platformPolicy; enable SH and EH at TPM_RESET and
    // TPM_RESTART
    if(type != SU_RESUME)
	{
	    gc.platformAuth.t.size = 0;
	    gc.platformPolicy.t.size = 0;
	    gc.platformAlg = TPM_ALG_NULL;
	    // enable the storage and endorsement hierarchies and the platformNV
	    gc.shEnable = gc.ehEnable = gc.phEnableNV = TRUE;
	}
    // nullProof and nullSeed are updated at every TPM_RESET
    if((type != SU_RESTART) && (type != SU_RESUME))
	{
	    gr.nullProof.t.size = sizeof(gr.nullProof.t.buffer);
	    CryptRandomGenerate(gr.nullProof.t.size, gr.nullProof.t.buffer);
	    gr.nullSeed.t.size = sizeof(gr.nullSeed.t.buffer);
	    CryptRandomGenerate(gr.nullSeed.t.size, gr.nullSeed.t.buffer);
	}
    return TRUE;
}
/* 8.3.3.3 HierarchyGetProof() */
/* This function finds the proof value associated with a hierarchy.It returns a pointer to the proof
   value. */
TPM2B_PROOF *
HierarchyGetProof(
		  TPMI_RH_HIERARCHY    hierarchy      // IN: hierarchy constant
		  )
{
    TPM2B_PROOF         *proof = NULL;
    switch(hierarchy)
	{
	  case TPM_RH_PLATFORM:
	    // phProof for TPM_RH_PLATFORM
	    proof = &gp.phProof;
	    break;
	  case TPM_RH_ENDORSEMENT:
	    // ehProof for TPM_RH_ENDORSEMENT
	    proof = &gp.ehProof;
	    break;
	  case TPM_RH_OWNER:
	    // shProof for TPM_RH_OWNER
	    proof = &gp.shProof;
	    break;
	  default:
	    // nullProof for TPM_RH_NULL or anything else
	    proof = &gr.nullProof;
	    break;
	}
    return proof;
}
/* 8.3.3.4 HierarchyGetPrimarySeed() */
/* This function returns the primary seed of a hierarchy. */
TPM2B_SEED *
HierarchyGetPrimarySeed(
			TPMI_RH_HIERARCHY    hierarchy      // IN: hierarchy
			)
{
    TPM2B_SEED          *seed = NULL;
    switch(hierarchy)
	{
	  case TPM_RH_PLATFORM:
	    seed = &gp.PPSeed;
	    break;
	  case TPM_RH_OWNER:
	    seed = &gp.SPSeed;
	    break;
	  case TPM_RH_ENDORSEMENT:
	    seed = &gp.EPSeed;
	    break;
	  default:
	    seed = &gr.nullSeed;
	    break;
	}
    return seed;
}
/* 8.3.3.5 HierarchyIsEnabled() */
/* This function checks to see if a hierarchy is enabled. */
/* NOTE: The TPM_RH_NULL hierarchy is always enabled. */
/* Return Values Meaning */
/* TRUE hierarchy is enabled */
/* FALSE hierarchy is disabled */
BOOL
HierarchyIsEnabled(
		   TPMI_RH_HIERARCHY    hierarchy      // IN: hierarchy
		   )
{
    BOOL            enabled = FALSE;
    switch(hierarchy)
	{
	  case TPM_RH_PLATFORM:
	    enabled = g_phEnable;
	    break;
	  case TPM_RH_OWNER:
	    enabled = gc.shEnable;
	    break;
	  case TPM_RH_ENDORSEMENT:
	    enabled = gc.ehEnable;
	    break;
	  case TPM_RH_NULL:
	    enabled = TRUE;
	    break;
	  default:
	    enabled = FALSE;
	    break;
	}
    return enabled;
}