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_ChangeAuth_fp.h" 10 // 11 // 12 // Error Returns Meaning 13 // 14 // TPM_RC_SIZE newAuth size is larger than the digest size of the Name algorithm for 15 // the Index referenced by 'nvIndex 16 // 17 TPM_RC 18 TPM2_NV_ChangeAuth( 19 NV_ChangeAuth_In *in // IN: input parameter list 20 ) 21 { 22 TPM_RC result; 23 NV_INDEX nvIndex; 24 25 // Input Validation 26 // Check if NV is available. NvIsAvailable may return TPM_RC_NV_UNAVAILABLE 27 // TPM_RC_NV_RATE or TPM_RC_SUCCESS. 28 result = NvIsAvailable(); 29 if(result != TPM_RC_SUCCESS) return result; 30 31 // Read index info from NV 32 NvGetIndexInfo(in->nvIndex, &nvIndex); 33 34 // Remove any trailing zeros that might have been added by the caller 35 // to obfuscate the size. 36 MemoryRemoveTrailingZeros(&(in->newAuth)); 37 38 // Make sure that the authValue is no larger than the nameAlg of the Index 39 if(in->newAuth.t.size > CryptGetHashDigestSize(nvIndex.publicArea.nameAlg)) 40 return TPM_RC_SIZE + RC_NV_ChangeAuth_newAuth; 41 42 // Internal Data Update 43 // Change auth 44 nvIndex.authValue = in->newAuth; 45 // Write index info back to NV 46 NvWriteIndexInfo(in->nvIndex, &nvIndex); 47 48 return TPM_RC_SUCCESS; 49 } 50
