src/tss2-fapi/api/Fapi_Encrypt.c - third_party/github.com/tpm2-software/tpm2-tss - Git at Google

 /* SPDX-License-Identifier: BSD-2-Clause */
 /*******************************************************************************
  * Copyright 2018-2019, Fraunhofer SIT sponsored by Infineon Technologies AG
  * All rights reserved.
  ******************************************************************************/

 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif

 #include <stdlib.h>
 #include <errno.h>
 #include <unistd.h>
 #include <errno.h>
 #include <string.h>

 #include "tss2_fapi.h"
 #include "fapi_int.h"
 #include "fapi_util.h"
 #include "tss2_esys.h"
 #include "ifapi_json_serialize.h"
 #include "fapi_policy.h"
 #define LOGMODULE fapi
 #include "util/log.h"
 #include "util/aux_util.h"
 #include "fapi_crypto.h"

 #define IV_SIZE 16

 /** One-Call function for Fapi_Encrypt
  *
  * Encrypt the provided data for the target key using the TPM encryption
  * schemes as specified in the crypto profile.
  * This function does not use the TPM; i.e. works in non-TPM mode.
  *
  * @param[in,out] context The FAPI_CONTEXT
  * @param[in] keyPath THe path to the encryption key
  * @param[in] plainText The plaintext data to encrypt
  * @param[in] plainTextSize The size of the plainText in bytes
  * @param[out] cipherText The encoded cipher text.
  * @param[out] cipherTextSize The size of the encoded cipher text.
  *
  * @retval TSS2_RC_SUCCESS: if the function call was a success.
  * @retval TSS2_FAPI_RC_BAD_REFERENCE: if context, keyPath, plainText, or
  *         cipherText is NULL.
  * @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected.
  * @retval TSS2_FAPI_RC_KEY_NOT_FOUND: if keyPath does not map to a FAPI key.
  * @retval TSS2_FAPI_RC_BAD_KEY: if the key at keyPath is unsuitable for
  *         encryption.
  * @retval TSS2_FAPI_RC_BAD_VALUE: if plainTextSize is 0.
  * @retval TSS2_FAPI_RC_BAD_SEQUENCE: if the context has an asynchronous
  *         operation already pending.
  * @retval TSS2_FAPI_RC_MEMORY: if the FAPI cannot allocate enough memory for
  *         internal operations or return parameters.
  * @retval TSS2_FAPI_RC_NO_TPM if FAPI was initialized in no-TPM-mode via its
  *         config file.
  * @retval TSS2_FAPI_RC_IO_ERROR if an error occurred while accessing the
  *         object store.
  * @retval TSS2_FAPI_RC_NOT_IMPLEMENTED if the encryption algorithm is not available.
  * @retval TSS2_FAPI_RC_TRY_AGAIN if an I/O operation is not finished yet and
  *         this function needs to be called again.
  * @retval TSS2_FAPI_RC_PATH_NOT_FOUND if a FAPI object path was not found
  *         during authorization.
  * @retval TSS2_FAPI_RC_GENERAL_FAILURE if an internal error occurred.
  * @retval TSS2_FAPI_RC_AUTHORIZATION_UNKNOWN if a required authorization callback
  *         is not set.
  * @retval TSS2_FAPI_RC_AUTHORIZATION_FAILED if the authorization attempt fails.
  * @retval TSS2_FAPI_RC_POLICY_UNKNOWN if policy search for a certain policy digest
  *         was not successful.
  * @retval TSS2_ESYS_RC_* possible error codes of ESAPI.
  */
 TSS2_RC
 Fapi_Encrypt(
     FAPI_CONTEXT  *context,
     char    const *keyPath,
     uint8_t const *plainText,
     size_t         plainTextSize,
     uint8_t      **cipherText,
     size_t        *cipherTextSize)
 {
     LOG_TRACE("called for context:%p", context);

     TSS2_RC r, r2;

     /* Check for NULL parameters */
     check_not_null(context);
     check_not_null(keyPath);
     check_not_null(plainText);
     check_not_null(cipherText);

     /* Check whether TCTI and ESYS are initialized */
     return_if_null(context->esys, "Command can't be executed in none TPM mode.",
                    TSS2_FAPI_RC_NO_TPM);

     /* If the async state automata of FAPI shall be tested, then we must not set
        the timeouts of ESYS to blocking mode.
        During testing, the mssim tcti will ensure multiple re-invocations.
        Usually however the synchronous invocations of FAPI shall instruct ESYS
        to block until a result is available. */
 #ifndef TEST_FAPI_ASYNC
     r = Esys_SetTimeout(context->esys, TSS2_TCTI_TIMEOUT_BLOCK);
     return_if_error_reset_state(r, "Set Timeout to blocking");
 #endif /* TEST_FAPI_ASYNC */

     r = Fapi_Encrypt_Async(context, keyPath, plainText, plainTextSize);
     return_if_error_reset_state(r, "Data_Encrypt");

     do {
         /* We wait for file I/O to be ready if the FAPI state automata
            are in a file I/O state. */
         r = ifapi_io_poll(&context->io);
         return_if_error(r, "Something went wrong with IO polling");

         /* Repeatedly call the finish function, until FAPI has transitioned
            through all execution stages / states of this invocation. */
         r = Fapi_Encrypt_Finish(context, cipherText, cipherTextSize);
     } while ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN);

     /* Reset the ESYS timeout to non-blocking, immediate response. */
     r2 = Esys_SetTimeout(context->esys, 0);
     return_if_error(r2, "Set Timeout to non-blocking");

     return_if_error_reset_state(r, "Data_Encrypt");

     LOG_TRACE("finished");
     return TSS2_RC_SUCCESS;
 }

 /** Asynchronous function for Fapi_Encrypt
  *
  * Encrypt the provided data for the target key using the TPM encryption
  * schemes as specified in the crypto profile.
  * This function does not use the TPM; i.e. works in non-TPM mode.
  *
  * Call Fapi_Encrypt_Finish to finish the execution of this command.
  *
  * @param[in,out] context The FAPI_CONTEXT
  * @param[in] keyPath The path to the encryption key
  * @param[in] plainText The plainText data to encrypt
  * @param[in] plainTextSize The size of the plainText in bytes
  *
  * @retval TSS2_RC_SUCCESS: if the function call was a success.
  * @retval TSS2_FAPI_RC_BAD_REFERENCE: if context, keyPath or plainText is
  *         NULL.
  * @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected.
  * @retval TSS2_FAPI_RC_KEY_NOT_FOUND: if keyPath does not map to a FAPI key.
  * @retval TSS2_FAPI_RC_BAD_KEY: if the key at keyPath is unsuitable for
  *         encryption.
  * @retval TSS2_FAPI_RC_BAD_VALUE: if plainTextSize is 0.
  * @retval TSS2_FAPI_RC_BAD_SEQUENCE: if the context has an asynchronous
  *         operation already pending.
  * @retval TSS2_FAPI_RC_MEMORY: if the FAPI cannot allocate enough memory for
  *         internal operations or return parameters.
  * @retval TSS2_FAPI_RC_NO_TPM if FAPI was initialized in no-TPM-mode via its
  *         config file.
  */
 TSS2_RC
 Fapi_Encrypt_Async(
     FAPI_CONTEXT  *context,
     char    const *keyPath,
     uint8_t const *plainText,
     size_t         plainTextSize)
 {
     LOG_TRACE("called for context:%p", context);
     LOG_TRACE("keyPath: %s", keyPath);
     if (plainText) {
         LOGBLOB_TRACE(plainText, plainTextSize, "plainText");
     } else {
         LOG_TRACE("plainText: (null) plainTextSize: %zi", plainTextSize);
     }

     TSS2_RC r;

     /* Check for NULL parameters */
     check_not_null(context);
     check_not_null(keyPath);
     check_not_null(plainText);

     /* Helpful alias pointers */
     IFAPI_Data_EncryptDecrypt * command = &(context->cmd.Data_EncryptDecrypt);

     r = ifapi_session_init(context);
     return_if_error(r, "Initialize Encrypt");

     /* Copy parameters to context for use during _Finish. */
     uint8_t *inData = malloc(plainTextSize);
     goto_if_null(inData, "Out of memory", r, error_cleanup);
     memcpy(inData, plainText, plainTextSize);
     command->in_data = inData;

     strdup_check(command->keyPath, keyPath, r, error_cleanup);

     command->in_dataSize = plainTextSize;
     command->key_handle = ESYS_TR_NONE;
     command->cipherText = NULL;

     /* Initialize the context state for this operation. */
     context->state = DATA_ENCRYPT_WAIT_FOR_PROFILE;
     LOG_TRACE("finished");
     return TSS2_RC_SUCCESS;

 error_cleanup:
     SAFE_FREE(inData);
     SAFE_FREE(command->keyPath);
     return r;
 }

 /** Asynchronous finish function for Fapi_Encrypt
  *
  * This function should be called after a previous Fapi_Encrypt_Async.
  *
  * @param[in,out] context The FAPI_CONTEXT
  * @param[out] cipherText The encoded ciphertext
  * @param[out] cipherTextSize The size of the encoded cipher text.
  *
  * @retval TSS2_RC_SUCCESS: if the function call was a success.
  * @retval TSS2_FAPI_RC_BAD_REFERENCE: if context or ciphertext is NULL.
  * @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected.
  * @retval TSS2_FAPI_RC_BAD_SEQUENCE: if the context has an asynchronous
  *         operation already pending.
  * @retval TSS2_FAPI_RC_IO_ERROR: if the data cannot be saved.
  * @retval TSS2_FAPI_RC_MEMORY: if the FAPI cannot allocate enough memory for
  *         internal operations or return parameters.
  * @retval TSS2_FAPI_RC_TRY_AGAIN: if the asynchronous operation is not yet
  *         complete. Call this function again later.
  * @retval TSS2_FAPI_RC_NOT_IMPLEMENTED if the encryption algorithm is not available.
  * @retval TSS2_FAPI_RC_BAD_VALUE if an invalid value was passed into
  *         the function.
  * @retval TSS2_FAPI_RC_PATH_NOT_FOUND if a FAPI object path was not found
  *         during authorization.
  * @retval TSS2_FAPI_RC_KEY_NOT_FOUND if a key was not found.
  * @retval TSS2_FAPI_RC_GENERAL_FAILURE if an internal error occurred.
  * @retval TSS2_FAPI_RC_AUTHORIZATION_UNKNOWN if a required authorization callback
  *         is not set.
  * @retval TSS2_FAPI_RC_AUTHORIZATION_FAILED if the authorization attempt fails.
  * @retval TSS2_FAPI_RC_POLICY_UNKNOWN if policy search for a certain policy digest
  *         was not successful.
  * @retval TSS2_ESYS_RC_* possible error codes of ESAPI.
  */
 TSS2_RC
 Fapi_Encrypt_Finish(
     FAPI_CONTEXT  *context,
     uint8_t      **cipherText,
     size_t        *cipherTextSize)
 {
     LOG_TRACE("called for context:%p", context);

     TSS2_RC r;

     /* Check for NULL parameters */
     check_not_null(context);
     check_not_null(cipherText);

     /* Helpful alias pointers */
     IFAPI_Data_EncryptDecrypt * command = &context->cmd.Data_EncryptDecrypt;
     IFAPI_OBJECT *encKeyObject;
     TPM2B_PUBLIC_KEY_RSA *tpmCipherText = NULL;

     switch (context->state) {
         statecase(context->state, DATA_ENCRYPT_WAIT_FOR_PROFILE);
             /* Retrieve the profile for the provided key in order to get the
                encryption scheme below. */
             r = ifapi_profiles_get(&context->profiles, command->keyPath,
                                    &command->profile);
             return_try_again(r);
             goto_if_error_reset_state(r, " FAPI create session", error_cleanup);

             /* Initialize a session used for authorization and parameter encryption. */
             r = ifapi_get_sessions_async(context,
                                          IFAPI_SESSION_GENEK | IFAPI_SESSION1,
                                          TPMA_SESSION_ENCRYPT | TPMA_SESSION_DECRYPT, 0);
             goto_if_error_reset_state(r, "Create sessions", error_cleanup);

             fallthrough;

         statecase(context->state, DATA_ENCRYPT_WAIT_FOR_SESSION);
         r = ifapi_get_sessions_finish(context, &context->profiles.default_profile,
                                       context->profiles.default_profile.nameAlg);
             return_try_again(r);
             goto_if_error(r, "Get session.", error_cleanup);

             /* Load the reference key by loading all of its parents starting from the SRK. */
             r = ifapi_load_keys_async(context, command->keyPath);
             goto_if_error(r, "Load keys.", error_cleanup);

             fallthrough;

         statecase(context->state, DATA_ENCRYPT_WAIT_FOR_KEY);
             r = ifapi_load_keys_finish(context, IFAPI_FLUSH_PARENT,
                                        &command->key_handle,
                                        &command->key_object);
             return_try_again(r);
             goto_if_error_reset_state(r, " Load key.", error_cleanup);

             encKeyObject = command->key_object;

             if (encKeyObject->misc.key.public.publicArea.type == TPM2_ALG_RSA) {
                 TPM2B_DATA null_data = { .size = 0, .buffer = {} };
                 TPM2B_PUBLIC_KEY_RSA *rsa_message = (TPM2B_PUBLIC_KEY_RSA *)&context->aux_data;
                 size_t key_size =
                     encKeyObject->misc.key.public.publicArea.parameters.rsaDetail.keyBits / 8;
                 if (context->cmd.Data_EncryptDecrypt.in_dataSize > key_size) {
                     goto_error_reset_state(r, TSS2_FAPI_RC_BAD_VALUE,
                                            "Size to big for RSA encryption.", error_cleanup);
                 }
                 rsa_message->size = context->cmd.Data_EncryptDecrypt.in_dataSize;

                 memcpy(&rsa_message->buffer[0], context->cmd.Data_EncryptDecrypt.in_data,
                        context->cmd.Data_EncryptDecrypt.in_dataSize);

                 /* Received plain text will be encrypted */
                 r = Esys_TRSess_SetAttributes(context->esys, context->session1,
                                               TPMA_SESSION_CONTINUESESSION |  TPMA_SESSION_DECRYPT,
                                               0xff);
                 goto_if_error_reset_state(r, "Set session attributes.", error_cleanup);

                 r = Esys_RSA_Encrypt_Async(context->esys,
                                            context->cmd.Data_EncryptDecrypt.key_handle,
                                            context->session1, ESYS_TR_NONE, ESYS_TR_NONE,
                                            rsa_message,
                                            &command->profile->rsa_decrypt_scheme,
                                            &null_data);
                 goto_if_error(r, "Error esys rsa encrypt", error_cleanup);

                 context-> state = DATA_ENCRYPT_WAIT_FOR_RSA_ENCRYPTION;
             } else {
                 goto_error(r, TSS2_FAPI_RC_NOT_IMPLEMENTED,
                            "Unsupported algorithm (%" PRIu16 ")",
                            error_cleanup, encKeyObject->misc.key.public.publicArea.type);
             }
             fallthrough;

         statecase(context->state, DATA_ENCRYPT_WAIT_FOR_RSA_ENCRYPTION);
             r = Esys_RSA_Encrypt_Finish(context->esys, &tpmCipherText);
             return_try_again(r);
             goto_if_error_reset_state(r, "RSA encryption.", error_cleanup);

             /* Return cipherTextSize if requested by the caller. */
             if (cipherTextSize)
                 command->cipherTextSize = tpmCipherText->size;

             /* Duplicate the outputs for handling off to the caller. */
             command->cipherText = malloc(tpmCipherText->size);
             goto_if_null2(command->cipherText, "Out of memory", r, TSS2_FAPI_RC_MEMORY,
                           error_cleanup);

             memcpy(command->cipherText, &tpmCipherText->buffer[0], tpmCipherText->size);
             SAFE_FREE(tpmCipherText);

             /* Flush the key from the TPM. */
             if (!command->key_object->misc.key.persistent_handle) {
                 r = Esys_FlushContext_Async(context->esys,
                                         command->key_handle);
                 goto_if_error(r, "Error: FlushContext", error_cleanup);
             }
             fallthrough;

         statecase(context->state, DATA_ENCRYPT_WAIT_FOR_FLUSH);
             if (!command->key_object->misc.key.persistent_handle) {
                 r = Esys_FlushContext_Finish(context->esys);
                 return_try_again(r);

                 goto_if_error(r, "Error: FlushContext", error_cleanup);
             }
             command->key_handle = ESYS_TR_NONE;
             fallthrough;

         statecase(context->state, DATA_ENCRYPT_CLEAN)
             /* Cleanup the sessions. */
             r = ifapi_cleanup_session(context);
             try_again_or_error_goto(r, "Cleanup", error_cleanup);

             *cipherText = command->cipherText;
             if (cipherTextSize)
                 *cipherTextSize = command->cipherTextSize;
             break;

         statecasedefault(context->state);
     }

     context->state = _FAPI_STATE_INIT;

 error_cleanup:
     /* Cleanup any intermediate results and state stored in the context. */
     if (command->key_handle != ESYS_TR_NONE)
         Esys_FlushContext(context->esys,  command->key_handle);
     if (r)
         SAFE_FREE(command->cipherText);
     ifapi_cleanup_ifapi_object(&context->loadKey.auth_object);
     ifapi_cleanup_ifapi_object(context->loadKey.key_object);
     ifapi_cleanup_ifapi_object(&context->createPrimary.pkey_object);
     ifapi_cleanup_ifapi_object(command->key_object);
     SAFE_FREE(tpmCipherText);
     SAFE_FREE(command->keyPath);
     SAFE_FREE(command->in_data);
     ifapi_session_clean(context);
     LOG_TRACE("finished");
     return r;
 }
	/* SPDX-License-Identifier: BSD-2-Clause */
	/*******************************************************************************
	* Copyright 2018-2019, Fraunhofer SIT sponsored by Infineon Technologies AG
	* All rights reserved.
	******************************************************************************/

	#ifdef HAVE_CONFIG_H
	#include <config.h>
	#endif

	#include <stdlib.h>
	#include <errno.h>
	#include <unistd.h>
	#include <errno.h>
	#include <string.h>

	#include "tss2_fapi.h"
	#include "fapi_int.h"
	#include "fapi_util.h"
	#include "tss2_esys.h"
	#include "ifapi_json_serialize.h"
	#include "fapi_policy.h"
	#define LOGMODULE fapi
	#include "util/log.h"
	#include "util/aux_util.h"
	#include "fapi_crypto.h"

	#define IV_SIZE 16

	/** One-Call function for Fapi_Encrypt
	*
	* Encrypt the provided data for the target key using the TPM encryption
	* schemes as specified in the crypto profile.
	* This function does not use the TPM; i.e. works in non-TPM mode.
	*
	* @param[in,out] context The FAPI_CONTEXT
	* @param[in] keyPath THe path to the encryption key
	* @param[in] plainText The plaintext data to encrypt
	* @param[in] plainTextSize The size of the plainText in bytes
	* @param[out] cipherText The encoded cipher text.
	* @param[out] cipherTextSize The size of the encoded cipher text.
	*
	* @retval TSS2_RC_SUCCESS: if the function call was a success.
	* @retval TSS2_FAPI_RC_BAD_REFERENCE: if context, keyPath, plainText, or
	* cipherText is NULL.
	* @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected.
	* @retval TSS2_FAPI_RC_KEY_NOT_FOUND: if keyPath does not map to a FAPI key.
	* @retval TSS2_FAPI_RC_BAD_KEY: if the key at keyPath is unsuitable for
	* encryption.
	* @retval TSS2_FAPI_RC_BAD_VALUE: if plainTextSize is 0.
	* @retval TSS2_FAPI_RC_BAD_SEQUENCE: if the context has an asynchronous
	* operation already pending.
	* @retval TSS2_FAPI_RC_MEMORY: if the FAPI cannot allocate enough memory for
	* internal operations or return parameters.
	* @retval TSS2_FAPI_RC_NO_TPM if FAPI was initialized in no-TPM-mode via its
	* config file.
	* @retval TSS2_FAPI_RC_IO_ERROR if an error occurred while accessing the
	* object store.
	* @retval TSS2_FAPI_RC_NOT_IMPLEMENTED if the encryption algorithm is not available.
	* @retval TSS2_FAPI_RC_TRY_AGAIN if an I/O operation is not finished yet and
	* this function needs to be called again.
	* @retval TSS2_FAPI_RC_PATH_NOT_FOUND if a FAPI object path was not found
	* during authorization.
	* @retval TSS2_FAPI_RC_GENERAL_FAILURE if an internal error occurred.
	* @retval TSS2_FAPI_RC_AUTHORIZATION_UNKNOWN if a required authorization callback
	* is not set.
	* @retval TSS2_FAPI_RC_AUTHORIZATION_FAILED if the authorization attempt fails.
	* @retval TSS2_FAPI_RC_POLICY_UNKNOWN if policy search for a certain policy digest
	* was not successful.
	* @retval TSS2_ESYS_RC_* possible error codes of ESAPI.
	*/
	TSS2_RC
	Fapi_Encrypt(
	FAPI_CONTEXT *context,
	char const *keyPath,
	uint8_t const *plainText,
	size_t plainTextSize,
	uint8_t **cipherText,
	size_t *cipherTextSize)
	{
	LOG_TRACE("called for context:%p", context);

	TSS2_RC r, r2;

	/* Check for NULL parameters */
	check_not_null(context);
	check_not_null(keyPath);
	check_not_null(plainText);
	check_not_null(cipherText);

	/* Check whether TCTI and ESYS are initialized */
	return_if_null(context->esys, "Command can't be executed in none TPM mode.",
	TSS2_FAPI_RC_NO_TPM);

	/* If the async state automata of FAPI shall be tested, then we must not set
	the timeouts of ESYS to blocking mode.
	During testing, the mssim tcti will ensure multiple re-invocations.
	Usually however the synchronous invocations of FAPI shall instruct ESYS
	to block until a result is available. */
	#ifndef TEST_FAPI_ASYNC
	r = Esys_SetTimeout(context->esys, TSS2_TCTI_TIMEOUT_BLOCK);
	return_if_error_reset_state(r, "Set Timeout to blocking");
	#endif /* TEST_FAPI_ASYNC */

	r = Fapi_Encrypt_Async(context, keyPath, plainText, plainTextSize);
	return_if_error_reset_state(r, "Data_Encrypt");

	do {
	/* We wait for file I/O to be ready if the FAPI state automata
	are in a file I/O state. */
	r = ifapi_io_poll(&context->io);
	return_if_error(r, "Something went wrong with IO polling");

	/* Repeatedly call the finish function, until FAPI has transitioned
	through all execution stages / states of this invocation. */
	r = Fapi_Encrypt_Finish(context, cipherText, cipherTextSize);
	} while ((r & ~TSS2_RC_LAYER_MASK) == TSS2_BASE_RC_TRY_AGAIN);

	/* Reset the ESYS timeout to non-blocking, immediate response. */
	r2 = Esys_SetTimeout(context->esys, 0);
	return_if_error(r2, "Set Timeout to non-blocking");

	return_if_error_reset_state(r, "Data_Encrypt");

	LOG_TRACE("finished");
	return TSS2_RC_SUCCESS;
	}

	/** Asynchronous function for Fapi_Encrypt
	*
	* Encrypt the provided data for the target key using the TPM encryption
	* schemes as specified in the crypto profile.
	* This function does not use the TPM; i.e. works in non-TPM mode.
	*
	* Call Fapi_Encrypt_Finish to finish the execution of this command.
	*
	* @param[in,out] context The FAPI_CONTEXT
	* @param[in] keyPath The path to the encryption key
	* @param[in] plainText The plainText data to encrypt
	* @param[in] plainTextSize The size of the plainText in bytes
	*
	* @retval TSS2_RC_SUCCESS: if the function call was a success.
	* @retval TSS2_FAPI_RC_BAD_REFERENCE: if context, keyPath or plainText is
	* NULL.
	* @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected.
	* @retval TSS2_FAPI_RC_KEY_NOT_FOUND: if keyPath does not map to a FAPI key.
	* @retval TSS2_FAPI_RC_BAD_KEY: if the key at keyPath is unsuitable for
	* encryption.
	* @retval TSS2_FAPI_RC_BAD_VALUE: if plainTextSize is 0.
	* @retval TSS2_FAPI_RC_BAD_SEQUENCE: if the context has an asynchronous
	* operation already pending.
	* @retval TSS2_FAPI_RC_MEMORY: if the FAPI cannot allocate enough memory for
	* internal operations or return parameters.
	* @retval TSS2_FAPI_RC_NO_TPM if FAPI was initialized in no-TPM-mode via its
	* config file.
	*/
	TSS2_RC
	Fapi_Encrypt_Async(
	FAPI_CONTEXT *context,
	char const *keyPath,
	uint8_t const *plainText,
	size_t plainTextSize)
	{
	LOG_TRACE("called for context:%p", context);
	LOG_TRACE("keyPath: %s", keyPath);
	if (plainText) {
	LOGBLOB_TRACE(plainText, plainTextSize, "plainText");
	} else {
	LOG_TRACE("plainText: (null) plainTextSize: %zi", plainTextSize);
	}

	TSS2_RC r;

	/* Check for NULL parameters */
	check_not_null(context);
	check_not_null(keyPath);
	check_not_null(plainText);

	/* Helpful alias pointers */
	IFAPI_Data_EncryptDecrypt * command = &(context->cmd.Data_EncryptDecrypt);

	r = ifapi_session_init(context);
	return_if_error(r, "Initialize Encrypt");

	/* Copy parameters to context for use during _Finish. */
	uint8_t *inData = malloc(plainTextSize);
	goto_if_null(inData, "Out of memory", r, error_cleanup);
	memcpy(inData, plainText, plainTextSize);
	command->in_data = inData;

	strdup_check(command->keyPath, keyPath, r, error_cleanup);

	command->in_dataSize = plainTextSize;
	command->key_handle = ESYS_TR_NONE;
	command->cipherText = NULL;

	/* Initialize the context state for this operation. */
	context->state = DATA_ENCRYPT_WAIT_FOR_PROFILE;
	LOG_TRACE("finished");
	return TSS2_RC_SUCCESS;

	error_cleanup:
	SAFE_FREE(inData);
	SAFE_FREE(command->keyPath);
	return r;
	}

	/** Asynchronous finish function for Fapi_Encrypt
	*
	* This function should be called after a previous Fapi_Encrypt_Async.
	*
	* @param[in,out] context The FAPI_CONTEXT
	* @param[out] cipherText The encoded ciphertext
	* @param[out] cipherTextSize The size of the encoded cipher text.
	*
	* @retval TSS2_RC_SUCCESS: if the function call was a success.
	* @retval TSS2_FAPI_RC_BAD_REFERENCE: if context or ciphertext is NULL.
	* @retval TSS2_FAPI_RC_BAD_CONTEXT: if context corruption is detected.
	* @retval TSS2_FAPI_RC_BAD_SEQUENCE: if the context has an asynchronous
	* operation already pending.
	* @retval TSS2_FAPI_RC_IO_ERROR: if the data cannot be saved.
	* @retval TSS2_FAPI_RC_MEMORY: if the FAPI cannot allocate enough memory for
	* internal operations or return parameters.
	* @retval TSS2_FAPI_RC_TRY_AGAIN: if the asynchronous operation is not yet
	* complete. Call this function again later.
	* @retval TSS2_FAPI_RC_NOT_IMPLEMENTED if the encryption algorithm is not available.
	* @retval TSS2_FAPI_RC_BAD_VALUE if an invalid value was passed into
	* the function.
	* @retval TSS2_FAPI_RC_PATH_NOT_FOUND if a FAPI object path was not found
	* during authorization.
	* @retval TSS2_FAPI_RC_KEY_NOT_FOUND if a key was not found.
	* @retval TSS2_FAPI_RC_GENERAL_FAILURE if an internal error occurred.
	* @retval TSS2_FAPI_RC_AUTHORIZATION_UNKNOWN if a required authorization callback
	* is not set.
	* @retval TSS2_FAPI_RC_AUTHORIZATION_FAILED if the authorization attempt fails.
	* @retval TSS2_FAPI_RC_POLICY_UNKNOWN if policy search for a certain policy digest
	* was not successful.
	* @retval TSS2_ESYS_RC_* possible error codes of ESAPI.
	*/
	TSS2_RC
	Fapi_Encrypt_Finish(
	FAPI_CONTEXT *context,
	uint8_t **cipherText,
	size_t *cipherTextSize)
	{
	LOG_TRACE("called for context:%p", context);

	TSS2_RC r;

	/* Check for NULL parameters */
	check_not_null(context);
	check_not_null(cipherText);

	/* Helpful alias pointers */
	IFAPI_Data_EncryptDecrypt * command = &context->cmd.Data_EncryptDecrypt;
	IFAPI_OBJECT *encKeyObject;
	TPM2B_PUBLIC_KEY_RSA *tpmCipherText = NULL;

	switch (context->state) {
	statecase(context->state, DATA_ENCRYPT_WAIT_FOR_PROFILE);
	/* Retrieve the profile for the provided key in order to get the
	encryption scheme below. */
	r = ifapi_profiles_get(&context->profiles, command->keyPath,
	&command->profile);
	return_try_again(r);
	goto_if_error_reset_state(r, " FAPI create session", error_cleanup);

	/* Initialize a session used for authorization and parameter encryption. */
	r = ifapi_get_sessions_async(context,
	IFAPI_SESSION_GENEK \| IFAPI_SESSION1,
	TPMA_SESSION_ENCRYPT \| TPMA_SESSION_DECRYPT, 0);
	goto_if_error_reset_state(r, "Create sessions", error_cleanup);

	fallthrough;

	statecase(context->state, DATA_ENCRYPT_WAIT_FOR_SESSION);
	r = ifapi_get_sessions_finish(context, &context->profiles.default_profile,
	context->profiles.default_profile.nameAlg);
	return_try_again(r);
	goto_if_error(r, "Get session.", error_cleanup);

	/* Load the reference key by loading all of its parents starting from the SRK. */
	r = ifapi_load_keys_async(context, command->keyPath);
	goto_if_error(r, "Load keys.", error_cleanup);

	fallthrough;

	statecase(context->state, DATA_ENCRYPT_WAIT_FOR_KEY);
	r = ifapi_load_keys_finish(context, IFAPI_FLUSH_PARENT,
	&command->key_handle,
	&command->key_object);
	return_try_again(r);
	goto_if_error_reset_state(r, " Load key.", error_cleanup);

	encKeyObject = command->key_object;

	if (encKeyObject->misc.key.public.publicArea.type == TPM2_ALG_RSA) {
	TPM2B_DATA null_data = { .size = 0, .buffer = {} };
	TPM2B_PUBLIC_KEY_RSA rsa_message = (TPM2B_PUBLIC_KEY_RSA )&context->aux_data;
	size_t key_size =
	encKeyObject->misc.key.public.publicArea.parameters.rsaDetail.keyBits / 8;
	if (context->cmd.Data_EncryptDecrypt.in_dataSize > key_size) {
	goto_error_reset_state(r, TSS2_FAPI_RC_BAD_VALUE,
	"Size to big for RSA encryption.", error_cleanup);
	}
	rsa_message->size = context->cmd.Data_EncryptDecrypt.in_dataSize;

	memcpy(&rsa_message->buffer[0], context->cmd.Data_EncryptDecrypt.in_data,
	context->cmd.Data_EncryptDecrypt.in_dataSize);

	/* Received plain text will be encrypted */
	r = Esys_TRSess_SetAttributes(context->esys, context->session1,
	TPMA_SESSION_CONTINUESESSION \| TPMA_SESSION_DECRYPT,
	0xff);
	goto_if_error_reset_state(r, "Set session attributes.", error_cleanup);

	r = Esys_RSA_Encrypt_Async(context->esys,
	context->cmd.Data_EncryptDecrypt.key_handle,
	context->session1, ESYS_TR_NONE, ESYS_TR_NONE,
	rsa_message,
	&command->profile->rsa_decrypt_scheme,
	&null_data);
	goto_if_error(r, "Error esys rsa encrypt", error_cleanup);

	context-> state = DATA_ENCRYPT_WAIT_FOR_RSA_ENCRYPTION;
	} else {
	goto_error(r, TSS2_FAPI_RC_NOT_IMPLEMENTED,
	"Unsupported algorithm (%" PRIu16 ")",
	error_cleanup, encKeyObject->misc.key.public.publicArea.type);
	}
	fallthrough;

	statecase(context->state, DATA_ENCRYPT_WAIT_FOR_RSA_ENCRYPTION);
	r = Esys_RSA_Encrypt_Finish(context->esys, &tpmCipherText);
	return_try_again(r);
	goto_if_error_reset_state(r, "RSA encryption.", error_cleanup);

	/* Return cipherTextSize if requested by the caller. */
	if (cipherTextSize)
	command->cipherTextSize = tpmCipherText->size;

	/* Duplicate the outputs for handling off to the caller. */
	command->cipherText = malloc(tpmCipherText->size);
	goto_if_null2(command->cipherText, "Out of memory", r, TSS2_FAPI_RC_MEMORY,
	error_cleanup);

	memcpy(command->cipherText, &tpmCipherText->buffer[0], tpmCipherText->size);
	SAFE_FREE(tpmCipherText);

	/* Flush the key from the TPM. */
	if (!command->key_object->misc.key.persistent_handle) {
	r = Esys_FlushContext_Async(context->esys,
	command->key_handle);
	goto_if_error(r, "Error: FlushContext", error_cleanup);
	}
	fallthrough;

	statecase(context->state, DATA_ENCRYPT_WAIT_FOR_FLUSH);
	if (!command->key_object->misc.key.persistent_handle) {
	r = Esys_FlushContext_Finish(context->esys);
	return_try_again(r);

	goto_if_error(r, "Error: FlushContext", error_cleanup);
	}
	command->key_handle = ESYS_TR_NONE;
	fallthrough;

	statecase(context->state, DATA_ENCRYPT_CLEAN)
	/* Cleanup the sessions. */
	r = ifapi_cleanup_session(context);
	try_again_or_error_goto(r, "Cleanup", error_cleanup);

	*cipherText = command->cipherText;
	if (cipherTextSize)
	*cipherTextSize = command->cipherTextSize;
	break;

	statecasedefault(context->state);
	}

	context->state = _FAPI_STATE_INIT;

	error_cleanup:
	/* Cleanup any intermediate results and state stored in the context. */
	if (command->key_handle != ESYS_TR_NONE)
	Esys_FlushContext(context->esys, command->key_handle);
	if (r)
	SAFE_FREE(command->cipherText);
	ifapi_cleanup_ifapi_object(&context->loadKey.auth_object);
	ifapi_cleanup_ifapi_object(context->loadKey.key_object);
	ifapi_cleanup_ifapi_object(&context->createPrimary.pkey_object);
	ifapi_cleanup_ifapi_object(command->key_object);
	SAFE_FREE(tpmCipherText);
	SAFE_FREE(command->keyPath);
	SAFE_FREE(command->in_data);
	ifapi_session_clean(context);
	LOG_TRACE("finished");
	return r;
	}