此TPM仿真器是否遵循TPM規範來擴展PCR寄存器？

以下代碼來自Mario Strasser的TPM仿真器。細則中指出，此TPM仿真器是否遵循TPM規範來擴展PCR寄存器？

PCR := SHA1(PCR || data)

讀「拼接PCR的原值與數據，散列連接字符串和散列存儲在PCR」。這不是PCR := PCR BITWISE-OR SHA1(data)也不PCR := SHA1(PCR BITWISE-OR data)

TPM_RESULT TPM_Extend(TPM_PCRINDEX pcrNum, TPM_DIGEST *inDigest, 
         TPM_PCRVALUE *outDigest) 
{ 
    tpm_sha1_ctx_t ctx; 

    info("TPM_Extend()"); 
    if (pcrNum >= TPM_NUM_PCR) return TPM_BADINDEX; 
    if (!(PCR_ATTRIB[pcrNum].pcrExtendLocal & (1 << LOCALITY))) return TPM_BAD_LOCALITY; 
    /* compute new PCR value as SHA-1(old PCR value || inDigest) */ 
    tpm_sha1_init(&ctx); 
    tpm_sha1_update(&ctx, PCR_VALUE[pcrNum].digest, sizeof(PCR_VALUE[pcrNum].digest)); 
    tpm_sha1_update(&ctx, inDigest->digest, sizeof(inDigest->digest)); 
    tpm_sha1_final(&ctx, PCR_VALUE[pcrNum].digest); 
    /* set output digest */ 
    if (tpmData.permanent.flags.disable) { 
    memset(outDigest->digest, 0, sizeof(*outDigest->digest)); 
    } else { 
    memcpy(outDigest, &PCR_VALUE[pcrNum], sizeof(TPM_PCRVALUE)); 
    } 
    return TPM_SUCCESS; 
}

來源

2009-11-10 idazuwaika

據我所知，是的。看到我的評論Perform OR on two hash outputs of sha1sum

來源

2009-11-10 11:47:24 laalto

老實說，我不知道什麼是內部散列狀態。所以基本上我想在http://stackoverflow.com/questions/1706999/perform-or-on-two-hash-outputs-of-sha1sum中做的是不正確的。感謝您指點 – idazuwaika 2009-11-10 11:55:45

此TPM仿真器是否遵循TPM規範來擴展PCR寄存器？

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