// This file was extracted from the TCG Published

// Trusted Platform Module Library

// Part 3: Commands

// Family "2.0"

// Level 00 Revision 01.16

// October 30, 2014

#include "InternalRoutines.h"

#include "ObjectChangeAuth_fp.h"

#include "Object_spt_fp.h"

//

//

//     Error Returns               Meaning

//

//     TPM_RC_SIZE                 newAuth is larger than the size of the digest of the Name algorithm of

//                                 objectHandle

//     TPM_RC_TYPE                 the key referenced by parentHandle is not the parent of the object

//                                 referenced by objectHandle; or objectHandle is a sequence object.

//

TPM_RC

TPM2_ObjectChangeAuth(

   ObjectChangeAuth_In    *in,                // IN: input parameter list

   ObjectChangeAuth_Out   *out                // OUT: output parameter list

   )

{

   TPMT_SENSITIVE          sensitive;

   OBJECT                 *object;

   TPM2B_NAME              objectQN, QNCompare;

   TPM2B_NAME              parentQN;

// Input Validation

   // Get object pointer

   object = ObjectGet(in->objectHandle);

   // Can not change auth on sequence object

   if(ObjectIsSequence(object))

       return TPM_RC_TYPE + RC_ObjectChangeAuth_objectHandle;

   // Make sure that the auth value is consistent with the nameAlg

   if( MemoryRemoveTrailingZeros(&in->newAuth)

           > CryptGetHashDigestSize(object->publicArea.nameAlg))

       return TPM_RC_SIZE + RC_ObjectChangeAuth_newAuth;

   // Check parent for object

   // parent handle must be the parent of object handle. In this

   // implementation we verify this by checking the QN of object. Other

   // implementation may choose different method to verify this attribute.

   ObjectGetQualifiedName(in->parentHandle, &parentQN);

   ObjectComputeQualifiedName(&parentQN, object->publicArea.nameAlg,

                              &object->name, &QNCompare);

   ObjectGetQualifiedName(in->objectHandle, &objectQN);

   if(!Memory2BEqual(&objectQN.b, &QNCompare.b))

       return TPM_RC_TYPE + RC_ObjectChangeAuth_parentHandle;

// Command Output

   // Copy internal sensitive area

   sensitive = object->sensitive;

   // Copy authValue

   sensitive.authValue = in->newAuth;

   // Prepare output private data from sensitive

   SensitiveToPrivate(&sensitive, &object->name, in->parentHandle,

                      object->publicArea.nameAlg,

                       &out->outPrivate);

   return TPM_RC_SUCCESS;

}