TPMCmd/tpm/src/command/Symmetric/Hash.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
 *  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 "Hash_fp.h"

#if CC_Hash  // Conditional expansion of this file

/*(See part 3 specification)
// Hash a data buffer
*/
TPM_RC
TPM2_Hash(
    Hash_In         *in,            // IN: input parameter list
    Hash_Out        *out            // OUT: output parameter list
    )
{
    HASH_STATE          hashState;

// Command Output

    // Output hash
        // Start hash stack
    out->outHash.t.size = CryptHashStart(&hashState, in->hashAlg);
        // Adding hash data
    CryptDigestUpdate2B(&hashState, &in->data.b);
        // Complete hash
    CryptHashEnd2B(&hashState, &out->outHash.b);

    // Output ticket
    out->validation.tag = TPM_ST_HASHCHECK;
    out->validation.hierarchy = in->hierarchy;

    if(in->hierarchy == TPM_RH_NULL)
    {
        // Ticket is not required
        out->validation.hierarchy = TPM_RH_NULL;
        out->validation.digest.t.size = 0;
    }
    else if(in->data.t.size >= sizeof(TPM_GENERATED_VALUE)
            && !TicketIsSafe(&in->data.b))
    {
        // Ticket is not safe
        out->validation.hierarchy = TPM_RH_NULL;
        out->validation.digest.t.size = 0;
    }
    else
    {
        // Compute ticket
        TicketComputeHashCheck(in->hierarchy, in->hashAlg,
                               &out->outHash, &out->validation);
    }

    return TPM_RC_SUCCESS;
}

#endif // CC_Hash