TPMCmd/tpm/src/command/Attestation/GetTime.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
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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 "Attest_spt_fp.h"
#include "GetTime_fp.h"

#if CC_GetTime  // Conditional expansion of this file

/*(See part 3 specification)
// Applies a time stamp to the passed blob (qualifyingData).
*/
//  Return Type: TPM_RC
//      TPM_RC_KEY          key referenced by 'signHandle' is not a signing key
//      TPM_RC_SCHEME       'inScheme' is incompatible with 'signHandle' type; or
//                          both 'scheme' and key's default scheme are empty; or
//                          'scheme' is empty while key's default scheme requires
//                          explicit input scheme (split signing); or
//                          non-empty default key scheme differs from 'scheme'
//      TPM_RC_VALUE        digest generated for the given 'scheme' is greater than
//                          the modulus of 'signHandle' (for an RSA key);
//                          invalid commit status or failed to generate "r" value
//                          (for an ECC key)
TPM_RC
TPM2_GetTime(
    GetTime_In      *in,            // IN: input parameter list
    GetTime_Out     *out            // OUT: output parameter list
    )
{
    TPMS_ATTEST             timeInfo;
    OBJECT                 *signObject = HandleToObject(in->signHandle);
// Input Validation
    if(!IsSigningObject(signObject))
        return TPM_RCS_KEY + RC_GetTime_signHandle;
    if(!CryptSelectSignScheme(signObject, &in->inScheme))
        return TPM_RCS_SCHEME + RC_GetTime_inScheme;

// Command Output
    // Fill in attest common fields
    FillInAttestInfo(in->signHandle, &in->inScheme, &in->qualifyingData, &timeInfo);

    // GetClock specific fields
    timeInfo.type = TPM_ST_ATTEST_TIME;
    timeInfo.attested.time.time.time = g_time;
    TimeFillInfo(&timeInfo.attested.time.time.clockInfo);

    // Firmware version in plain text
    timeInfo.attested.time.firmwareVersion
        = (((UINT64)gp.firmwareV1) << 32) + gp.firmwareV2;

    // Sign attestation structure.  A NULL signature will be returned if
    // signObject is NULL.
    return SignAttestInfo(signObject, &in->inScheme, &timeInfo, &in->qualifyingData,
                          &out->timeInfo, &out->signature);
}

#endif // CC_GetTime