/* 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

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 */

#include "Tpm.h"

#include "PolicyNameHash_fp.h"

#if CC_PolicyNameHash  // Conditional expansion of this file

/*(See part 3 specification)

// Add a nameHash restriction to the policyDigest

*/

//  Return Type: TPM_RC

//      TPM_RC_CPHASH     'nameHash' has been previously set to a different value

//      TPM_RC_SIZE       'nameHash' is not the size of the digest produced by the

//                        hash algorithm associated with 'policySession'

TPM_RC

TPM2_PolicyNameHash(PolicyNameHash_In* in  // IN: input parameter list

)

{

    SESSION*   session;

    TPM_CC     commandCode = TPM_CC_PolicyNameHash;

    HASH_STATE hashState;

    // Input Validation

    // Get pointer to the session structure

    session = SessionGet(in->policySession);

    // A valid nameHash must have the same size as session hash digest

    // Since the authHashAlg for a session cannot be TPM_ALG_NULL, the digest size

    // is always non-zero.

    if(in->nameHash.t.size != CryptHashGetDigestSize(session->authHashAlg))

        return TPM_RCS_SIZE + RC_PolicyNameHash_nameHash;

    // u1 in the policy session context cannot otherwise be occupied

    if(session->u1.cpHash.b.size != 0 || session->attributes.isBound

       || session->attributes.isCpHashDefined || session->attributes.isTemplateSet)

        return TPM_RC_CPHASH;

    // Internal Data Update

    // Update policy hash

    // policyDigestnew = hash(policyDigestold || TPM_CC_PolicyNameHash || nameHash)

    //  Start hash

    CryptHashStart(&hashState, session->authHashAlg);

    //  add old digest

    CryptDigestUpdate2B(&hashState, &session->u2.policyDigest.b);

    //  add commandCode

    CryptDigestUpdateInt(&hashState, sizeof(TPM_CC), commandCode);

    //  add nameHash

    CryptDigestUpdate2B(&hashState, &in->nameHash.b);

    //  complete the digest

    CryptHashEnd2B(&hashState, &session->u2.policyDigest.b);

    // update nameHash in session context

    session->u1.cpHash = in->nameHash;

    return TPM_RC_SUCCESS;

}

#endif  // CC_PolicyNameHash