49 lines
1.4 KiB
C
49 lines
1.4 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_ChangeAuth_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_SIZE newAuth size is larger than the digest size of the Name algorithm for
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// the Index referenced by 'nvIndex
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//
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TPM_RC
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TPM2_NV_ChangeAuth(
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NV_ChangeAuth_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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// Input Validation
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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) return result;
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// Read index info from NV
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NvGetIndexInfo(in->nvIndex, &nvIndex);
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// Remove any trailing zeros that might have been added by the caller
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// to obfuscate the size.
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MemoryRemoveTrailingZeros(&(in->newAuth));
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// Make sure that the authValue is no larger than the nameAlg of the Index
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if(in->newAuth.t.size > CryptGetHashDigestSize(nvIndex.publicArea.nameAlg))
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return TPM_RC_SIZE + RC_NV_ChangeAuth_newAuth;
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// Internal Data Update
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// Change auth
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nvIndex.authValue = in->newAuth;
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// Write index info back to NV
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NvWriteIndexInfo(in->nvIndex, &nvIndex);
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return TPM_RC_SUCCESS;
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}
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