90 lines
2.9 KiB
C
90 lines
2.9 KiB
C
// This file was extracted from the TCG Published
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// Trusted Platform Module Library
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// Part 3: Commands
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// Family "2.0"
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// Level 00 Revision 01.16
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// October 30, 2014
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#include "InternalRoutines.h"
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#include "NV_Extend_fp.h"
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#include "NV_spt_fp.h"
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//
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//
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// Error Returns Meaning
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//
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// TPM_RC_ATTRIBUTES the TPMA_NV_EXTEND attribute is not SET in the Index referenced
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// by nvIndex
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// TPM_RC_NV_AUTHORIZATION the authorization was valid but the authorizing entity (authHandle) is
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// not allowed to write to the Index referenced by nvIndex
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// TPM_RC_NV_LOCKED the Index referenced by nvIndex is locked for writing
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//
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TPM_RC
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TPM2_NV_Extend(
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NV_Extend_In *in // IN: input parameter list
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)
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{
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TPM_RC result;
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NV_INDEX nvIndex;
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TPM2B_DIGEST oldDigest;
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TPM2B_DIGEST newDigest;
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HASH_STATE hashState;
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// Input Validation
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// Common access checks, NvWriteAccessCheck() may return TPM_RC_NV_AUTHORIZATION
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// or TPM_RC_NV_LOCKED
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result = NvWriteAccessChecks(in->authHandle, in->nvIndex);
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if(result != TPM_RC_SUCCESS)
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return result;
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// Get NV index info
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NvGetIndexInfo(in->nvIndex, &nvIndex);
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// Make sure that this is an extend index
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if(nvIndex.publicArea.attributes.TPMA_NV_EXTEND != SET)
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return TPM_RC_ATTRIBUTES + RC_NV_Extend_nvIndex;
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// If the Index is not-orderly, or if this is the first write, NV will
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// need to be updated.
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if( nvIndex.publicArea.attributes.TPMA_NV_ORDERLY == CLEAR
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|| nvIndex.publicArea.attributes.TPMA_NV_WRITTEN == CLEAR)
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{
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// Check if NV is available. NvIsAvailable may return TPM_RC_NV_UNAVAILABLE
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// TPM_RC_NV_RATE or TPM_RC_SUCCESS.
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result = NvIsAvailable();
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if(result != TPM_RC_SUCCESS)
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return result;
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}
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// Internal Data Update
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// Perform the write.
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oldDigest.t.size = CryptGetHashDigestSize(nvIndex.publicArea.nameAlg);
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pAssert(oldDigest.t.size <= sizeof(oldDigest.t.buffer));
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if(nvIndex.publicArea.attributes.TPMA_NV_WRITTEN == SET)
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{
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NvGetIndexData(in->nvIndex, &nvIndex, 0,
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oldDigest.t.size, oldDigest.t.buffer);
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}
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else
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{
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MemorySet(oldDigest.t.buffer, 0, oldDigest.t.size);
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}
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// Start hash
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newDigest.t.size = CryptStartHash(nvIndex.publicArea.nameAlg, &hashState);
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// Adding old digest
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CryptUpdateDigest2B(&hashState, &oldDigest.b);
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// Adding new data
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CryptUpdateDigest2B(&hashState, &in->data.b);
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// Complete hash
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CryptCompleteHash2B(&hashState, &newDigest.b);
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// Write extended hash back.
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// Note, this routine will SET the TPMA_NV_WRITTEN attribute if necessary
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return NvWriteIndexData(in->nvIndex, &nvIndex, 0,
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newDigest.t.size, newDigest.t.buffer);
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}
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