TPMCmd/tpm/src/command/HashHMAC/SequenceUpdate.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
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 *  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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 *  (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 "SequenceUpdate_fp.h"

#ifdef TPM_CC_SequenceUpdate  // Conditional expansion of this file

/*(See part 3 specification)
// This function is used to add data to a sequence object.
*/
// return type: TPM_RC
//      TPM_RC_MODE             'sequenceHandle' does not reference a hash or HMAC
//                              sequence object
TPM_RC
TPM2_SequenceUpdate(
    SequenceUpdate_In   *in             // IN: input parameter list
    )
{
    OBJECT                  *object;
    HASH_OBJECT             *hashObject;

// Input Validation

    // Get sequence object pointer
    object = HandleToObject(in->sequenceHandle);
    hashObject = (HASH_OBJECT *)object;

    // Check that referenced object is a sequence object.
    if(!ObjectIsSequence(object))
        return TPM_RCS_MODE + RC_SequenceUpdate_sequenceHandle;

// Internal Data Update

    if(object->attributes.eventSeq == SET)
    {
        // Update event sequence object
        UINT32           i;
        for(i = 0; i < HASH_COUNT; i++)
        {
            // Update sequence object
            CryptDigestUpdate2B(&hashObject->state.hashState[i], &in->buffer.b);
        }
    }
    else
    {
        // Update hash/HMAC sequence object
        if(hashObject->attributes.hashSeq == SET)
        {
            // Is this the first block of the sequence
            if(hashObject->attributes.firstBlock == CLEAR)
            {
                // If so, indicate that first block was received
                hashObject->attributes.firstBlock = SET;

                // Check the first block to see if the first block can contain
                // the TPM_GENERATED_VALUE.  If it does, it is not safe for
                // a ticket.
                if(TicketIsSafe(&in->buffer.b))
                    hashObject->attributes.ticketSafe = SET;
            }
            // Update sequence object hash/HMAC stack
            CryptDigestUpdate2B(&hashObject->state.hashState[0], &in->buffer.b);
        }
        else if(object->attributes.hmacSeq == SET)
        {
            // Update sequence object HMAC stack
            CryptDigestUpdate2B(&hashObject->state.hmacState.hashState,
                                &in->buffer.b);
        }
    }
    return TPM_RC_SUCCESS;
}

#endif // CC_SequenceUpdate