TPMCmd/tpm/src/command/Hierarchy/ChangeEPS.c

/* Microsoft Reference Implementation for TPM 2.0
 *
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 *  included below. This software may be subject to other third party and
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 *  Copyright (c) Microsoft Corporation
 *
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 *
 *  BSD License
 *
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 *  are permitted provided that the following conditions are met:
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 *  Redistributions of source code must retain the above copyright notice, this list
 *  of conditions and the following disclaimer.
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 *  Redistributions in binary form must reproduce the above copyright notice, this
 *  list of conditions and the following disclaimer in the documentation and/or other
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#include "Tpm.h"
#include "ChangeEPS_fp.h"

#ifdef TPM_CC_ChangeEPS  // Conditional expansion of this file

/*(See part 3 specification)
// Reset current EPS value
*/
TPM_RC
TPM2_ChangeEPS(
    ChangeEPS_In    *in             // IN: input parameter list
    )
{
    // The command needs NV update.  Check if NV is available.
    // A TPM_RC_NV_UNAVAILABLE or TPM_RC_NV_RATE error may be returned at
    // this point
    RETURN_IF_NV_IS_NOT_AVAILABLE;

    // Input parameter is not reference in command action
    NOT_REFERENCED(in);

// Internal Data Update

    // Reset endorsement hierarchy seed from RNG
    CryptRandomGenerate(sizeof(gp.EPSeed.t.buffer), gp.EPSeed.t.buffer);

    // Create new ehProof value from RNG
    CryptRandomGenerate(sizeof(gp.ehProof.t.buffer), gp.ehProof.t.buffer);

    // Enable endorsement hierarchy
    gc.ehEnable = TRUE;

    // set authValue buffer to zeros
    MemorySet(gp.endorsementAuth.t.buffer, 0, gp.endorsementAuth.t.size);
    // Set endorsement authValue to null
    gp.endorsementAuth.t.size = 0;

    // Set endorsement authPolicy to null
    gp.endorsementAlg = TPM_ALG_NULL;
    gp.endorsementPolicy.t.size = 0;

    // Flush loaded object in endorsement hierarchy
    ObjectFlushHierarchy(TPM_RH_ENDORSEMENT);

    // Flush evict object of endorsement hierarchy stored in NV
    NvFlushHierarchy(TPM_RH_ENDORSEMENT);

    // Save hierarchy changes to NV
    NV_SYNC_PERSISTENT(EPSeed);
    NV_SYNC_PERSISTENT(ehProof);
    NV_SYNC_PERSISTENT(endorsementAuth);
    NV_SYNC_PERSISTENT(endorsementAlg);
    NV_SYNC_PERSISTENT(endorsementPolicy);

    // orderly state should be cleared because of the update to state clear data
    g_clearOrderly = TRUE;

    return TPM_RC_SUCCESS;
}

#endif // CC_ChangeEPS