src/tss2-esys/api/Esys_ObjectChangeAuth.c - platform/external/tpm2-tss - Git at Google

 /*******************************************************************************
  * Copyright 2017-2018, Fraunhofer SIT sponsored by Infineon Technologies AG
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright notice,
  * this list of conditions and the following disclaimer.
  *
  * 2. Redistributions in binary form must reproduce the above copyright notice,
  * this list of conditions and the following disclaimer in the documentation
  * and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  ******************************************************************************/

 #include "tss2_mu.h"
 #include "tss2_sys.h"
 #ifndef TSS2_API_VERSION_1_2_1_108
 #error Version missmatch among TSS2 header files !
 #endif /* TSS2_API_VERSION_1_2_1_108 */
 #include "esys_types.h"
 #include "tss2_esys.h"
 #include "esys_iutil.h"
 #include "esys_mu.h"
 #include "tss2_sys.h"
 #define LOGMODULE esys
 #include "util/log.h"

 /** Store command parameters inside the ESYS_CONTEXT for use during _finish */
 static void store_input_parameters (
     ESYS_CONTEXT *esysContext,
     ESYS_TR objectHandle,
     ESYS_TR parentHandle,
     const TPM2B_AUTH *newAuth)
 {
     esysContext->in.ObjectChangeAuth.objectHandle = objectHandle;
     esysContext->in.ObjectChangeAuth.parentHandle = parentHandle;
     if (newAuth == NULL) {
         esysContext->in.ObjectChangeAuth.newAuth = NULL;
     } else {
         esysContext->in.ObjectChangeAuth.newAuthData = *newAuth;
         esysContext->in.ObjectChangeAuth.newAuth =
             &esysContext->in.ObjectChangeAuth.newAuthData;
     }
 }

 /** One-Call function for TPM2_ObjectChangeAuth
  *
  * This function invokes the TPM2_ObjectChangeAuth command in a one-call
  * variant. This means the function will block until the TPM response is
  * available. All input parameters are const. The memory for non-simple output
  * parameters is allocated by the function implementation.
  *
  * @param[in,out] esysContext The ESYS_CONTEXT.
  * @param[in] objectHandle Input handle of type ESYS_TR for
  *     object with handle type TPMI_DH_OBJECT.
  * @param[in] parentHandle Input handle of type ESYS_TR for
  *     object with handle type TPMI_DH_OBJECT.
  * @param[in] shandle1 First session handle.
  * @param[in] shandle2 Second session handle.
  * @param[in] shandle3 Third session handle.
  * @param[in] newAuth Input parameter of type TPM2B_AUTH.
  * @param[out] outPrivate (callee-allocated) Output parameter
  *    of type TPM2B_PRIVATE. May be NULL if this value is not required.
  * @retval TSS2_RC_SUCCESS on success
  * @retval TSS2_RC_BAD_SEQUENCE if context is not ready for this function
  * \todo add further error RCs to documentation
  */
 TSS2_RC
 Esys_ObjectChangeAuth(
     ESYS_CONTEXT *esysContext,
     ESYS_TR objectHandle,
     ESYS_TR parentHandle,
     ESYS_TR shandle1,
     ESYS_TR shandle2,
     ESYS_TR shandle3,
     const TPM2B_AUTH *newAuth,
     TPM2B_PRIVATE **outPrivate)
 {
     TSS2_RC r = TSS2_RC_SUCCESS;

     r = Esys_ObjectChangeAuth_async(esysContext,
                 objectHandle,
                 parentHandle,
                 shandle1,
                 shandle2,
                 shandle3,
                 newAuth);
     return_if_error(r, "Error in async function");

     /* Set the timeout to indefinite for now, since we want _finish to block */
     int32_t timeouttmp = esysContext->timeout;
     esysContext->timeout = -1;
     /*
      * Now we call the finish function, until return code is not equal to
      * from TSS2_BASE_RC_TRY_AGAIN.
      * Note that the finish function may return TSS2_RC_TRY_AGAIN, even if we
      * have set the timeout to -1. This occurs for example if the TPM requests
      * a retransmission of the command via TPM2_RC_YIELDED.
      */
     do {
         r = Esys_ObjectChangeAuth_finish(esysContext,
                 outPrivate);
         /* This is just debug information about the reattempt to finish the
            command */
         if ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN)
             LOG_DEBUG("A layer below returned TRY_AGAIN: %" PRIx32
                       " => resubmitting command", r);
     } while ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN);

     /* Restore the timeout value to the original value */
     esysContext->timeout = timeouttmp;
     return_if_error(r, "Esys Finish");

     return TSS2_RC_SUCCESS;
 }

 /** Asynchronous function for TPM2_ObjectChangeAuth
  *
  * This function invokes the TPM2_ObjectChangeAuth command in a asynchronous
  * variant. This means the function will return as soon as the command has been
  * sent downwards the stack to the TPM. All input parameters are const.
  * In order to retrieve the TPM's response call Esys_ObjectChangeAuth_finish.
  *
  * @param[in,out] esysContext The ESYS_CONTEXT.
  * @param[in] objectHandle Input handle of type ESYS_TR for
  *     object with handle type TPMI_DH_OBJECT.
  * @param[in] parentHandle Input handle of type ESYS_TR for
  *     object with handle type TPMI_DH_OBJECT.
  * @param[in] shandle1 First session handle.
  * @param[in] shandle2 Second session handle.
  * @param[in] shandle3 Third session handle.
  * @param[in] newAuth Input parameter of type TPM2B_AUTH.
  * @retval TSS2_RC_SUCCESS on success
  * @retval TSS2_RC_BAD_SEQUENCE if context is not ready for this function
  * \todo add further error RCs to documentation
  */
 TSS2_RC
 Esys_ObjectChangeAuth_async(
     ESYS_CONTEXT *esysContext,
     ESYS_TR objectHandle,
     ESYS_TR parentHandle,
     ESYS_TR shandle1,
     ESYS_TR shandle2,
     ESYS_TR shandle3,
     const TPM2B_AUTH *newAuth)
 {
     TSS2_RC r = TSS2_RC_SUCCESS;
     TSS2L_SYS_AUTH_COMMAND auths = { 0 };
     RSRC_NODE_T *objectHandleNode;
     RSRC_NODE_T *parentHandleNode;

     if (esysContext == NULL) {
         LOG_ERROR("esyscontext is NULL.");
         return TSS2_ESYS_RC_BAD_REFERENCE;
     }
     r = iesys_check_sequence_async(esysContext);
     if (r != TSS2_RC_SUCCESS)
         return r;
     r = check_session_feasability(shandle1, shandle2, shandle3, 1);
     return_if_error(r, "Check session usage");

     store_input_parameters(esysContext, objectHandle, parentHandle,
                 newAuth);
     r = esys_GetResourceObject(esysContext, objectHandle, &objectHandleNode);
     if (r != TPM2_RC_SUCCESS)
         return r;
     r = esys_GetResourceObject(esysContext, parentHandle, &parentHandleNode);
     if (r != TPM2_RC_SUCCESS)
         return r;
     r = Tss2_Sys_ObjectChangeAuth_Prepare(esysContext->sys,
                 (objectHandleNode == NULL) ? TPM2_RH_NULL : objectHandleNode->rsrc.handle,
                 (parentHandleNode == NULL) ? TPM2_RH_NULL : parentHandleNode->rsrc.handle,
                 newAuth);
     if (r != TSS2_RC_SUCCESS) {
         LOG_ERROR("Error async ObjectChangeAuth");
         return r;
     }
     r = init_session_tab(esysContext, shandle1, shandle2, shandle3);
     return_if_error(r, "Initialize session resources");

     iesys_compute_session_value(esysContext->session_tab[0],
                 &objectHandleNode->rsrc.name, &objectHandleNode->auth);
     iesys_compute_session_value(esysContext->session_tab[1], NULL, NULL);
     iesys_compute_session_value(esysContext->session_tab[2], NULL, NULL);
     r = iesys_gen_auths(esysContext, objectHandleNode, parentHandleNode, NULL, &auths);
     return_if_error(r, "Error in computation of auth values");

     esysContext->authsCount = auths.count;
     r = Tss2_Sys_SetCmdAuths(esysContext->sys, &auths);
     if (r != TSS2_RC_SUCCESS) {
         return r;
     }

     r = Tss2_Sys_ExecuteAsync(esysContext->sys);
     return_if_error(r, "Finish (Execute Async)");

     esysContext->state = _ESYS_STATE_SENT;

     return r;
 }

 /** Asynchronous finish function for TPM2_ObjectChangeAuth
  *
  * This function returns the results of a TPM2_ObjectChangeAuth command
  * invoked via Esys_ObjectChangeAuth_finish. All non-simple output parameters
  * are allocated by the function's implementation. NULL can be passed for every
  * output parameter if the value is not required.
  *
  * @param[in,out] esysContext The ESYS_CONTEXT.
  * @param[out] outPrivate (callee-allocated) Output parameter
  *    of type TPM2B_PRIVATE. May be NULL if this value is not required.
  * @retval TSS2_RC_SUCCESS on success
  * @retval TSS2_RC_BAD_SEQUENCE if context is not ready for this function.
  * \todo add further error RCs to documentation
  */
 TSS2_RC
 Esys_ObjectChangeAuth_finish(
     ESYS_CONTEXT *esysContext,
     TPM2B_PRIVATE **outPrivate)
 {
     LOG_TRACE("complete");
     if (esysContext == NULL) {
         LOG_ERROR("esyscontext is NULL.");
         return TSS2_ESYS_RC_BAD_REFERENCE;
     }
     if (esysContext->state != _ESYS_STATE_SENT) {
         LOG_ERROR("Esys called in bad sequence.");
         return TSS2_ESYS_RC_BAD_SEQUENCE;
     }
     TSS2_RC r = TSS2_RC_SUCCESS;
     if (outPrivate != NULL) {
         *outPrivate = calloc(sizeof(TPM2B_PRIVATE), 1);
         if (*outPrivate == NULL) {
             return_error(TSS2_ESYS_RC_MEMORY, "Out of memory");
         }
     }
     r = Tss2_Sys_ExecuteFinish(esysContext->sys, esysContext->timeout);
     if ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN) {
         LOG_DEBUG("A layer below returned TRY_AGAIN: %" PRIx32, r);
         goto error_cleanup;
     }
     if (r == TPM2_RC_RETRY || r == TPM2_RC_TESTING || r == TPM2_RC_YIELDED) {
         LOG_DEBUG("TPM returned RETRY, TESTING or YIELDED, which triggers a "
             "resubmission: %" PRIx32, r);
         if (esysContext->submissionCount >= _ESYS_MAX_SUBMISSIONS) {
             LOG_WARNING("Maximum number of resubmissions has been reached.");
             esysContext->state = _ESYS_STATE_ERRORRESPONSE;
             goto error_cleanup;
         }
         esysContext->state = _ESYS_STATE_RESUBMISSION;
         r = Esys_ObjectChangeAuth_async(esysContext,
                 esysContext->in.ObjectChangeAuth.objectHandle,
                 esysContext->in.ObjectChangeAuth.parentHandle,
                 esysContext->session_type[0],
                 esysContext->session_type[1],
                 esysContext->session_type[2],
                 esysContext->in.ObjectChangeAuth.newAuth);
         if (r != TSS2_RC_SUCCESS) {
             LOG_ERROR("Error attempting to resubmit");
             goto error_cleanup;
         }
         r = TSS2_ESYS_RC_TRY_AGAIN;
         goto error_cleanup;
     }
     if (r != TSS2_RC_SUCCESS) {
         LOG_ERROR("Error finish (ExecuteFinish) ObjectChangeAuth");
         goto error_cleanup;
     }
     /*
      * Now the verification of the response (hmac check) and if necessary the
      * parameter decryption have to be done
      */
     r = iesys_check_response(esysContext);
     goto_if_error(r, "Error: check response",
                       error_cleanup);
     /*
      * After the verification of the response we call the complete function
      * to deliver the result.
      */
     r = Tss2_Sys_ObjectChangeAuth_Complete(esysContext->sys,
                 (outPrivate != NULL) ? *outPrivate : NULL);
     if (r != TSS2_RC_SUCCESS) {
         LOG_ERROR("Error finish (ExecuteFinish) ObjectChangeAuth: %" PRIx32, r);
         esysContext->state = _ESYS_STATE_ERRORRESPONSE;
         goto error_cleanup;;
     }
     esysContext->state = _ESYS_STATE_FINISHED;

     return r;

 error_cleanup:
     if (outPrivate != NULL)
         SAFE_FREE(*outPrivate);
     return r;
 }
	/*******************************************************************************
	* Copyright 2017-2018, Fraunhofer SIT sponsored by Infineon Technologies AG
	* All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* 1. Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright notice,
	* this list of conditions and the following disclaimer in the documentation
	* and/or other materials provided with the distribution.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	******************************************************************************/

	#include "tss2_mu.h"
	#include "tss2_sys.h"
	#ifndef TSS2_API_VERSION_1_2_1_108
	#error Version missmatch among TSS2 header files !
	#endif /* TSS2_API_VERSION_1_2_1_108 */
	#include "esys_types.h"
	#include "tss2_esys.h"
	#include "esys_iutil.h"
	#include "esys_mu.h"
	#include "tss2_sys.h"
	#define LOGMODULE esys
	#include "util/log.h"

	/** Store command parameters inside the ESYS_CONTEXT for use during _finish */
	static void store_input_parameters (
	ESYS_CONTEXT *esysContext,
	ESYS_TR objectHandle,
	ESYS_TR parentHandle,
	const TPM2B_AUTH *newAuth)
	{
	esysContext->in.ObjectChangeAuth.objectHandle = objectHandle;
	esysContext->in.ObjectChangeAuth.parentHandle = parentHandle;
	if (newAuth == NULL) {
	esysContext->in.ObjectChangeAuth.newAuth = NULL;
	} else {
	esysContext->in.ObjectChangeAuth.newAuthData = *newAuth;
	esysContext->in.ObjectChangeAuth.newAuth =
	&esysContext->in.ObjectChangeAuth.newAuthData;
	}
	}

	/** One-Call function for TPM2_ObjectChangeAuth
	*
	* This function invokes the TPM2_ObjectChangeAuth command in a one-call
	* variant. This means the function will block until the TPM response is
	* available. All input parameters are const. The memory for non-simple output
	* parameters is allocated by the function implementation.
	*
	* @param[in,out] esysContext The ESYS_CONTEXT.
	* @param[in] objectHandle Input handle of type ESYS_TR for
	* object with handle type TPMI_DH_OBJECT.
	* @param[in] parentHandle Input handle of type ESYS_TR for
	* object with handle type TPMI_DH_OBJECT.
	* @param[in] shandle1 First session handle.
	* @param[in] shandle2 Second session handle.
	* @param[in] shandle3 Third session handle.
	* @param[in] newAuth Input parameter of type TPM2B_AUTH.
	* @param[out] outPrivate (callee-allocated) Output parameter
	* of type TPM2B_PRIVATE. May be NULL if this value is not required.
	* @retval TSS2_RC_SUCCESS on success
	* @retval TSS2_RC_BAD_SEQUENCE if context is not ready for this function
	* \todo add further error RCs to documentation
	*/
	TSS2_RC
	Esys_ObjectChangeAuth(
	ESYS_CONTEXT *esysContext,
	ESYS_TR objectHandle,
	ESYS_TR parentHandle,
	ESYS_TR shandle1,
	ESYS_TR shandle2,
	ESYS_TR shandle3,
	const TPM2B_AUTH *newAuth,
	TPM2B_PRIVATE **outPrivate)
	{
	TSS2_RC r = TSS2_RC_SUCCESS;

	r = Esys_ObjectChangeAuth_async(esysContext,
	objectHandle,
	parentHandle,
	shandle1,
	shandle2,
	shandle3,
	newAuth);
	return_if_error(r, "Error in async function");

	/* Set the timeout to indefinite for now, since we want _finish to block */
	int32_t timeouttmp = esysContext->timeout;
	esysContext->timeout = -1;
	/*
	* Now we call the finish function, until return code is not equal to
	* from TSS2_BASE_RC_TRY_AGAIN.
	* Note that the finish function may return TSS2_RC_TRY_AGAIN, even if we
	* have set the timeout to -1. This occurs for example if the TPM requests
	* a retransmission of the command via TPM2_RC_YIELDED.
	*/
	do {
	r = Esys_ObjectChangeAuth_finish(esysContext,
	outPrivate);
	/* This is just debug information about the reattempt to finish the
	command */
	if ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN)
	LOG_DEBUG("A layer below returned TRY_AGAIN: %" PRIx32
	" => resubmitting command", r);
	} while ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN);

	/* Restore the timeout value to the original value */
	esysContext->timeout = timeouttmp;
	return_if_error(r, "Esys Finish");

	return TSS2_RC_SUCCESS;
	}

	/** Asynchronous function for TPM2_ObjectChangeAuth
	*
	* This function invokes the TPM2_ObjectChangeAuth command in a asynchronous
	* variant. This means the function will return as soon as the command has been
	* sent downwards the stack to the TPM. All input parameters are const.
	* In order to retrieve the TPM's response call Esys_ObjectChangeAuth_finish.
	*
	* @param[in,out] esysContext The ESYS_CONTEXT.
	* @param[in] objectHandle Input handle of type ESYS_TR for
	* object with handle type TPMI_DH_OBJECT.
	* @param[in] parentHandle Input handle of type ESYS_TR for
	* object with handle type TPMI_DH_OBJECT.
	* @param[in] shandle1 First session handle.
	* @param[in] shandle2 Second session handle.
	* @param[in] shandle3 Third session handle.
	* @param[in] newAuth Input parameter of type TPM2B_AUTH.
	* @retval TSS2_RC_SUCCESS on success
	* @retval TSS2_RC_BAD_SEQUENCE if context is not ready for this function
	* \todo add further error RCs to documentation
	*/
	TSS2_RC
	Esys_ObjectChangeAuth_async(
	ESYS_CONTEXT *esysContext,
	ESYS_TR objectHandle,
	ESYS_TR parentHandle,
	ESYS_TR shandle1,
	ESYS_TR shandle2,
	ESYS_TR shandle3,
	const TPM2B_AUTH *newAuth)
	{
	TSS2_RC r = TSS2_RC_SUCCESS;
	TSS2L_SYS_AUTH_COMMAND auths = { 0 };
	RSRC_NODE_T *objectHandleNode;
	RSRC_NODE_T *parentHandleNode;

	if (esysContext == NULL) {
	LOG_ERROR("esyscontext is NULL.");
	return TSS2_ESYS_RC_BAD_REFERENCE;
	}
	r = iesys_check_sequence_async(esysContext);
	if (r != TSS2_RC_SUCCESS)
	return r;
	r = check_session_feasability(shandle1, shandle2, shandle3, 1);
	return_if_error(r, "Check session usage");

	store_input_parameters(esysContext, objectHandle, parentHandle,
	newAuth);
	r = esys_GetResourceObject(esysContext, objectHandle, &objectHandleNode);
	if (r != TPM2_RC_SUCCESS)
	return r;
	r = esys_GetResourceObject(esysContext, parentHandle, &parentHandleNode);
	if (r != TPM2_RC_SUCCESS)
	return r;
	r = Tss2_Sys_ObjectChangeAuth_Prepare(esysContext->sys,
	(objectHandleNode == NULL) ? TPM2_RH_NULL : objectHandleNode->rsrc.handle,
	(parentHandleNode == NULL) ? TPM2_RH_NULL : parentHandleNode->rsrc.handle,
	newAuth);
	if (r != TSS2_RC_SUCCESS) {
	LOG_ERROR("Error async ObjectChangeAuth");
	return r;
	}
	r = init_session_tab(esysContext, shandle1, shandle2, shandle3);
	return_if_error(r, "Initialize session resources");

	iesys_compute_session_value(esysContext->session_tab[0],
	&objectHandleNode->rsrc.name, &objectHandleNode->auth);
	iesys_compute_session_value(esysContext->session_tab[1], NULL, NULL);
	iesys_compute_session_value(esysContext->session_tab[2], NULL, NULL);
	r = iesys_gen_auths(esysContext, objectHandleNode, parentHandleNode, NULL, &auths);
	return_if_error(r, "Error in computation of auth values");

	esysContext->authsCount = auths.count;
	r = Tss2_Sys_SetCmdAuths(esysContext->sys, &auths);
	if (r != TSS2_RC_SUCCESS) {
	return r;
	}

	r = Tss2_Sys_ExecuteAsync(esysContext->sys);
	return_if_error(r, "Finish (Execute Async)");

	esysContext->state = _ESYS_STATE_SENT;

	return r;
	}

	/** Asynchronous finish function for TPM2_ObjectChangeAuth
	*
	* This function returns the results of a TPM2_ObjectChangeAuth command
	* invoked via Esys_ObjectChangeAuth_finish. All non-simple output parameters
	* are allocated by the function's implementation. NULL can be passed for every
	* output parameter if the value is not required.
	*
	* @param[in,out] esysContext The ESYS_CONTEXT.
	* @param[out] outPrivate (callee-allocated) Output parameter
	* of type TPM2B_PRIVATE. May be NULL if this value is not required.
	* @retval TSS2_RC_SUCCESS on success
	* @retval TSS2_RC_BAD_SEQUENCE if context is not ready for this function.
	* \todo add further error RCs to documentation
	*/
	TSS2_RC
	Esys_ObjectChangeAuth_finish(
	ESYS_CONTEXT *esysContext,
	TPM2B_PRIVATE **outPrivate)
	{
	LOG_TRACE("complete");
	if (esysContext == NULL) {
	LOG_ERROR("esyscontext is NULL.");
	return TSS2_ESYS_RC_BAD_REFERENCE;
	}
	if (esysContext->state != _ESYS_STATE_SENT) {
	LOG_ERROR("Esys called in bad sequence.");
	return TSS2_ESYS_RC_BAD_SEQUENCE;
	}
	TSS2_RC r = TSS2_RC_SUCCESS;
	if (outPrivate != NULL) {
	*outPrivate = calloc(sizeof(TPM2B_PRIVATE), 1);
	if (*outPrivate == NULL) {
	return_error(TSS2_ESYS_RC_MEMORY, "Out of memory");
	}
	}
	r = Tss2_Sys_ExecuteFinish(esysContext->sys, esysContext->timeout);
	if ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN) {
	LOG_DEBUG("A layer below returned TRY_AGAIN: %" PRIx32, r);
	goto error_cleanup;
	}
	if (r == TPM2_RC_RETRY \|\| r == TPM2_RC_TESTING \|\| r == TPM2_RC_YIELDED) {
	LOG_DEBUG("TPM returned RETRY, TESTING or YIELDED, which triggers a "
	"resubmission: %" PRIx32, r);
	if (esysContext->submissionCount >= _ESYS_MAX_SUBMISSIONS) {
	LOG_WARNING("Maximum number of resubmissions has been reached.");
	esysContext->state = _ESYS_STATE_ERRORRESPONSE;
	goto error_cleanup;
	}
	esysContext->state = _ESYS_STATE_RESUBMISSION;
	r = Esys_ObjectChangeAuth_async(esysContext,
	esysContext->in.ObjectChangeAuth.objectHandle,
	esysContext->in.ObjectChangeAuth.parentHandle,
	esysContext->session_type[0],
	esysContext->session_type[1],
	esysContext->session_type[2],
	esysContext->in.ObjectChangeAuth.newAuth);
	if (r != TSS2_RC_SUCCESS) {
	LOG_ERROR("Error attempting to resubmit");
	goto error_cleanup;
	}
	r = TSS2_ESYS_RC_TRY_AGAIN;
	goto error_cleanup;
	}
	if (r != TSS2_RC_SUCCESS) {
	LOG_ERROR("Error finish (ExecuteFinish) ObjectChangeAuth");
	goto error_cleanup;
	}
	/*
	* Now the verification of the response (hmac check) and if necessary the
	* parameter decryption have to be done
	*/
	r = iesys_check_response(esysContext);
	goto_if_error(r, "Error: check response",
	error_cleanup);
	/*
	* After the verification of the response we call the complete function
	* to deliver the result.
	*/
	r = Tss2_Sys_ObjectChangeAuth_Complete(esysContext->sys,
	(outPrivate != NULL) ? *outPrivate : NULL);
	if (r != TSS2_RC_SUCCESS) {
	LOG_ERROR("Error finish (ExecuteFinish) ObjectChangeAuth: %" PRIx32, r);
	esysContext->state = _ESYS_STATE_ERRORRESPONSE;
	goto error_cleanup;;
	}
	esysContext->state = _ESYS_STATE_FINISHED;

	return r;

	error_cleanup:
	if (outPrivate != NULL)
	SAFE_FREE(*outPrivate);
	return r;
	}