1 // This file was extracted from the TCG Published 2 // Trusted Platform Module Library 3 // Part 3: Commands 4 // Family "2.0" 5 // Level 00 Revision 01.16 6 // October 30, 2014 7 8 #include "InternalRoutines.h" 9 // 10 // This function is called to process a _TPM_Hash_End() indication. 11 // 12 void 13 _TPM_Hash_End( 14 void 15 ) 16 { 17 18 UINT32 i; 19 TPM2B_DIGEST digest; 20 HASH_OBJECT *hashObject; 21 TPMI_DH_PCR pcrHandle; 22 23 // If the DRTM handle is not being used, then either _TPM_Hash_Start has not 24 // been called, _TPM_Hash_End was previously called, or some other command 25 // was executed and the sequence was aborted. 26 if(g_DRTMHandle == TPM_RH_UNASSIGNED) 27 return; 28 29 // Get DRTM sequence object 30 hashObject = (HASH_OBJECT *)ObjectGet(g_DRTMHandle); 31 32 // Is this _TPM_Hash_End after Startup or before 33 if(TPMIsStarted()) 34 { 35 // After 36 37 // Reset the DRTM PCR 38 PCRResetDynamics(); 39 40 // Extend the DRTM_PCR. 41 pcrHandle = PCR_FIRST + DRTM_PCR; 42 43 // DRTM sequence increments restartCount 44 gr.restartCount++; 45 } 46 else 47 { 48 pcrHandle = PCR_FIRST + HCRTM_PCR; 49 } 50 51 // Complete hash and extend PCR, or if this is an HCRTM, complete 52 // the hash, reset the H-CRTM register (PCR[0]) to 0...04, and then 53 // extend the H-CRTM data 54 for(i = 0; i < HASH_COUNT; i++) 55 { 56 TPMI_ALG_HASH hash = CryptGetHashAlgByIndex(i); 57 // make sure that the PCR is implemented for this algorithm 58 if(PcrIsAllocated(pcrHandle, 59 hashObject->state.hashState[i].state.hashAlg)) 60 { 61 // Complete hash 62 digest.t.size = CryptGetHashDigestSize(hash); 63 CryptCompleteHash2B(&hashObject->state.hashState[i], &digest.b); 64 65 PcrDrtm(pcrHandle, hash, &digest); 66 } 67 } 68 69 // Flush sequence object. 70 // 71 ObjectFlush(g_DRTMHandle); 72 73 g_DRTMHandle = TPM_RH_UNASSIGNED; 74 75 g_DrtmPreStartup = TRUE; 76 77 return; 78 } 79
