TPMCmd/tpm/src/command/EA/PolicyPassword.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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 *  of conditions and the following disclaimer.
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 */
#include "Tpm.h"
#include "PolicyPassword_fp.h"

#if CC_PolicyPassword  // Conditional expansion of this file

#include "Policy_spt_fp.h"

/*(See part 3 specification)
// allows a policy to be bound to the authorization value of the authorized
// object
*/
TPM_RC
TPM2_PolicyPassword(
    PolicyPassword_In   *in             // IN: input parameter list
    )
{
    SESSION             *session;
    TPM_CC               commandCode = TPM_CC_PolicyAuthValue;
    HASH_STATE           hashState;

// Internal Data Update

    // Get pointer to the session structure
    session = SessionGet(in->policySession);

    // Update policy hash
    // policyDigestnew = hash(policyDigestold || TPM_CC_PolicyAuthValue)
    //  Start hash
    CryptHashStart(&hashState, session->authHashAlg);

    //  add old digest
    CryptDigestUpdate2B(&hashState, &session->u2.policyDigest.b);

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

    //  complete the digest
    CryptHashEnd2B(&hashState, &session->u2.policyDigest.b);

    //  Update isPasswordNeeded bit
    session->attributes.isPasswordNeeded = SET;
    session->attributes.isAuthValueNeeded = CLEAR;

    return TPM_RC_SUCCESS;
}

#endif // CC_PolicyPassword