TPMCmd/tpm/src/command/PCR/PCR_Event.c

/* Microsoft Reference Implementation for TPM 2.0
 *
 *  The copyright in this software is being made available under the BSD License,
 *  included below. This software may be subject to other third party and
 *  contributor rights, including patent rights, and no such rights are granted
 *  under this license.
 *
 *  Copyright (c) Microsoft Corporation
 *
 *  All rights reserved.
 *
 *  BSD License
 *
 *  Redistribution and use in source and binary forms, with or without modification,
 *  are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice, this list
 *  of conditions and the following disclaimer.
 *
 *  Redistributions in binary form must reproduce the above copyright notice, this
 *  list of conditions and the following disclaimer in the documentation and/or
 *  other materials provided with the distribution.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ""AS IS""
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
 *  ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
 *  ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "Tpm.h"
#include "PCR_Event_fp.h"

#if CC_PCR_Event  // Conditional expansion of this file

/*(See part 3 specification)
// Update PCR
*/
//  Return Type: TPM_RC
//      TPM_RC_LOCALITY             current command locality is not allowed to
//                                  extend the PCR referenced by 'pcrHandle'
TPM_RC
TPM2_PCR_Event(
    PCR_Event_In    *in,            // IN: input parameter list
    PCR_Event_Out   *out            // OUT: output parameter list
    )
{
    HASH_STATE          hashState;
    UINT32              i;
    UINT16              size;

// Input Validation

    // If a PCR extend is required
    if(in->pcrHandle != TPM_RH_NULL)
    {
        // If the PCR is not allow to extend, return error
        if(!PCRIsExtendAllowed(in->pcrHandle))
            return TPM_RC_LOCALITY;

        // If PCR is state saved and we need to update orderlyState, check NV
        // availability
        if(PCRIsStateSaved(in->pcrHandle))
            RETURN_IF_ORDERLY; 
    }

// Internal Data Update

    out->digests.count = HASH_COUNT;

    // Iterate supported PCR bank algorithms to extend
    for(i = 0; i < HASH_COUNT; i++)
    {
        TPM_ALG_ID  hash = CryptHashGetAlgByIndex(i);
        out->digests.digests[i].hashAlg = hash;
        size = CryptHashStart(&hashState, hash);
        CryptDigestUpdate2B(&hashState, &in->eventData.b);
        CryptHashEnd(&hashState, size,
                     (BYTE *)&out->digests.digests[i].digest);
        if(in->pcrHandle != TPM_RH_NULL)
            PCRExtend(in->pcrHandle, hash, size,
                      (BYTE *)&out->digests.digests[i].digest);
    }

    return TPM_RC_SUCCESS;
}

#endif // CC_PCR_Event