test/tpmclient/kdfa.c

//**********************************************************************;
// Copyright (c) 2015, Intel Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// 2. 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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// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//**********************************************************************;

#include "tpm20.h"
#include "sample.h"
#include <stdio.h>
#include <stdlib.h>
#include "sysapi_util.h"
#include "tss2_endian.h"
#define LOGMODULE test
#include "log/log.h"
//
//
TSS2_RC KDFa( TPMI_ALG_HASH hashAlg, TPM2B *key, char *label,
    TPM2B *contextU, TPM2B *contextV, UINT16 bits, TPM2B_MAX_BUFFER  *resultKey )
{
    TPM2B_DIGEST tmpResult;
    TPM2B_DIGEST tpm2bLabel, tpm2bBits, tpm2b_i_2;
    UINT8 *tpm2bBitsPtr = &tpm2bBits.buffer[0];
    UINT8 *tpm2b_i_2Ptr = &tpm2b_i_2.buffer[0];
    TPM2B_DIGEST *bufferList[8];
    UINT32 bitsSwizzled, i_Swizzled;
    TSS2_RC rval;
    int i, j;
    UINT16 bytes = bits / 8;

    LOG_DEBUG("KDFA, hashAlg = %4.4x", hashAlg);
    LOGBLOB_DEBUG(&key->buffer[0], key->size, "KDFA, key =");

    resultKey->size = 0;

    tpm2b_i_2.size = 4;

    tpm2bBits.size = 4;
    bitsSwizzled = BE_TO_HOST_32(bits);
    *(UINT32 *)tpm2bBitsPtr = bitsSwizzled;

    for(i = 0; label[i] != 0 ;i++ );

    tpm2bLabel.size = i+1;
    for( i = 0; i < tpm2bLabel.size; i++ )
    {
        tpm2bLabel.buffer[i] = label[i];
    }

    LOGBLOB_DEBUG(&tpm2bLabel.buffer[0], tpm2bLabel.size, "KDFA, tpm2bLabel =");
    LOGBLOB_DEBUG(&contextU->buffer[0], contextU->size, "KDFA, contextU =");
    LOGBLOB_DEBUG(&contextV->buffer[0], contextV->size, "KDFA, contextV =");

    resultKey->size = 0;

    i = 1;

    while(resultKey->size < bytes)
    {
        // Inner loop

        i_Swizzled = BE_TO_HOST_32(i++);
        *(UINT32 *)tpm2b_i_2Ptr = i_Swizzled;

        j = 0;
        bufferList[j++] = (TPM2B_DIGEST *)&(tpm2b_i_2);
        bufferList[j++] = (TPM2B_DIGEST *)&(tpm2bLabel);
        bufferList[j++] = (TPM2B_DIGEST *)contextU;
        bufferList[j++] = (TPM2B_DIGEST *)contextV;
        bufferList[j++] = (TPM2B_DIGEST *)&(tpm2bBits);
        bufferList[j++] = (TPM2B_DIGEST *)0;
#if LOGLEVEL == LOGLEVEL_DEBUG || \
    LOGLEVEL == LOGLEVEL_TRACE
        for( j = 0; bufferList[j] != 0; j++ )
        {
            LOGBLOB_DEBUG(&bufferList[j]->buffer[0], bufferList[j]->size, 
                "bufferlist[%d]:", j);
        }
#endif
        rval = TpmHmac(hashAlg, key, (TPM2B **)&( bufferList[0] ), &tmpResult);
        if( rval != TPM2_RC_SUCCESS )
        {
            return( rval );
        }

        ConcatSizedByteBuffer(resultKey, (TPM2B *)&tmpResult);
    }

    // Truncate the result to the desired size.
    resultKey->size = bytes;

    LOGBLOB_DEBUG(&resultKey->buffer[0], resultKey->size, "KDFA, resultKey = ");

    return TPM2_RC_SUCCESS;
}