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 | #include "NV_Extend_fp.h" |
| 10 | #include "NV_spt_fp.h" |
| 11 | // |
| 12 | // |
| 13 | // Error Returns Meaning |
| 14 | // |
| 15 | // TPM_RC_ATTRIBUTES the TPMA_NV_EXTEND attribute is not SET in the Index referenced |
| 16 | // by nvIndex |
| 17 | // TPM_RC_NV_AUTHORIZATION the authorization was valid but the authorizing entity (authHandle) is |
| 18 | // not allowed to write to the Index referenced by nvIndex |
| 19 | // TPM_RC_NV_LOCKED the Index referenced by nvIndex is locked for writing |
| 20 | // |
| 21 | TPM_RC |
| 22 | TPM2_NV_Extend( |
| 23 | NV_Extend_In *in // IN: input parameter list |
| 24 | ) |
| 25 | { |
| 26 | TPM_RC result; |
| 27 | NV_INDEX nvIndex; |
| 28 | |
| 29 | TPM2B_DIGEST oldDigest; |
| 30 | TPM2B_DIGEST newDigest; |
| 31 | HASH_STATE hashState; |
| 32 | |
| 33 | // Input Validation |
| 34 | |
| 35 | // Common access checks, NvWriteAccessCheck() may return TPM_RC_NV_AUTHORIZATION |
| 36 | // or TPM_RC_NV_LOCKED |
| 37 | result = NvWriteAccessChecks(in->authHandle, in->nvIndex); |
| 38 | if(result != TPM_RC_SUCCESS) |
| 39 | return result; |
| 40 | |
| 41 | // Get NV index info |
| 42 | NvGetIndexInfo(in->nvIndex, &nvIndex); |
| 43 | |
| 44 | // Make sure that this is an extend index |
| 45 | if(nvIndex.publicArea.attributes.TPMA_NV_EXTEND != SET) |
| 46 | return TPM_RC_ATTRIBUTES + RC_NV_Extend_nvIndex; |
| 47 | |
| 48 | // If the Index is not-orderly, or if this is the first write, NV will |
| 49 | // need to be updated. |
| 50 | if( nvIndex.publicArea.attributes.TPMA_NV_ORDERLY == CLEAR |
| 51 | || nvIndex.publicArea.attributes.TPMA_NV_WRITTEN == CLEAR) |
| 52 | { |
| 53 | // Check if NV is available. NvIsAvailable may return TPM_RC_NV_UNAVAILABLE |
| 54 | // TPM_RC_NV_RATE or TPM_RC_SUCCESS. |
| 55 | result = NvIsAvailable(); |
| 56 | if(result != TPM_RC_SUCCESS) |
| 57 | return result; |
| 58 | } |
| 59 | |
| 60 | // Internal Data Update |
| 61 | |
| 62 | // Perform the write. |
| 63 | oldDigest.t.size = CryptGetHashDigestSize(nvIndex.publicArea.nameAlg); |
| 64 | pAssert(oldDigest.t.size <= sizeof(oldDigest.t.buffer)); |
| 65 | if(nvIndex.publicArea.attributes.TPMA_NV_WRITTEN == SET) |
| 66 | { |
| 67 | NvGetIndexData(in->nvIndex, &nvIndex, 0, |
| 68 | oldDigest.t.size, oldDigest.t.buffer); |
| 69 | } |
| 70 | else |
| 71 | { |
| 72 | MemorySet(oldDigest.t.buffer, 0, oldDigest.t.size); |
| 73 | } |
| 74 | // Start hash |
| 75 | newDigest.t.size = CryptStartHash(nvIndex.publicArea.nameAlg, &hashState); |
| 76 | |
| 77 | // Adding old digest |
| 78 | CryptUpdateDigest2B(&hashState, &oldDigest.b); |
| 79 | |
| 80 | // Adding new data |
| 81 | CryptUpdateDigest2B(&hashState, &in->data.b); |
| 82 | |
| 83 | // Complete hash |
| 84 | CryptCompleteHash2B(&hashState, &newDigest.b); |
| 85 | |
| 86 | // Write extended hash back. |
| 87 | // Note, this routine will SET the TPMA_NV_WRITTEN attribute if necessary |
| 88 | return NvWriteIndexData(in->nvIndex, &nvIndex, 0, |
| 89 | newDigest.t.size, newDigest.t.buffer); |
| 90 | } |