/* 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 "NV_ChangeAuth_fp.h"

#if CC_NV_ChangeAuth  // Conditional expansion of this file

/*(See part 3 specification)
// change authorization value of a NV index
*/
//  Return Type: TPM_RC
//      TPM_RC_SIZE                     'newAuth' size is larger than the digest
//                                      size of the Name algorithm for the Index
//                                      referenced by 'nvIndex'
TPM_RC
TPM2_NV_ChangeAuth(
    NV_ChangeAuth_In    *in             // IN: input parameter list
    )
{
    NV_REF           locator;
    NV_INDEX        *nvIndex = NvGetIndexInfo(in->nvIndex, &locator);

// Input Validation

    // Remove trailing zeros and make sure that the result is not larger than the
    // digest of the nameAlg.
    if(MemoryRemoveTrailingZeros(&in->newAuth) 
       > CryptHashGetDigestSize(nvIndex->publicArea.nameAlg))
        return TPM_RCS_SIZE + RC_NV_ChangeAuth_newAuth;

// Internal Data Update
    // Change authValue
    return NvWriteIndexAuth(locator, &in->newAuth);
}

#endif // CC_NV_ChangeAuth