Vadim Bendebury | 5679752 | 2015-05-20 10:32:25 -0700 | [diff] [blame] | 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 | } |