mcuxClMacModes_Cmac_Aes128_Compute_Dma_NonBlocking_example.c

mcuxClMacModes example application

mcuxClMacModes example application

/*--------------------------------------------------------------------------*/
/* Copyright 2023-2026 NXP                                                  */
/*                                                                          */
/* SPDX-License-Identifier: BSD-3-Clause                                    */
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#include <mcuxClSession.h>
#include <mcuxClResource.h>
#include <mcuxClKey.h>
#include <mcuxClAes.h> // Interface to AES-related definitions and types
#include <mcuxClMac.h> // Interface to the entire mcuxClMac component
#include <mcuxClMacModes.h> // Interface to the entire mcuxClMacModes component
 
#include <mcuxCsslFlowProtection.h>
#include <mcuxClCore_FunctionIdentifiers.h> // Code flow protection
#include <mcuxClBuffer.h>
#include <mcuxClCore_Examples.h>
#include <mcuxClExample_OS.h>
#include <mcuxClExample_Session_Helper.h>
#include <mcuxClExample_RNG_Helper.h>
 
#include <platform_specific_headers.h> // needed for DMA interrupts
 
/************************************************************************************/
/* Reference data to process and check results                                      */
/************************************************************************************/

static const uint8_t keyData[16] = {
  0x2bU, 0x7eU, 0x15U, 0x16U, 0x28U, 0xaeU, 0xd2U, 0xa6U,
  0xabU, 0xf7U, 0x15U, 0x88U, 0x09U, 0xcfU, 0x4fU, 0x3cU
};
 
/************************************************************************************/
/* Helper code to synchronize example flow with nonBlocking background computation  */
/************************************************************************************/
 
#define MCUXCLMAC_STATUS_CALLBACK_NOT_EXECUTED ((uint32_t) 0xDEADBEEFU)
/* This variable is used to keep track of callbacks triggered by the non-blocking API. */
static volatile uint32_t macStatus_nonBlockingCallback = MCUXCLMAC_STATUS_CALLBACK_NOT_EXECUTED;
 
/* This function is called after the nonBlocking operation has finished */
static void user_callback(uint32_t status, void * data)
{
  (void)data;
  macStatus_nonBlockingCallback = status;
}
 
#define MCUXCLMAC_FLAG_DMA_INTERRUPT_NOT_TRIGGERED ((uint32_t) 0xDEADBEEFU)
/* This variable is a flag to notify the caller that an interrupt happened.
   It will contain the DMA channel ID of the respective channel that had an interrupt. */
static volatile uint32_t flag_interruptNumber = MCUXCLMAC_FLAG_DMA_INTERRUPT_NOT_TRIGGERED;
 
/* Interrupt configuration code                                           */
/**************************************************************************/
/* Global resource context to handle status and session for the available HW resources.
   It shall be global and therefor only allocated once, for all sessions.
   Note that the examples create a "static" version of this global context, which is done
   solely to make sure examples are self-contained and do not conflict with each other. */
 
static uint32_t resourceContext[MCUXCLRESOURCE_CONTEXT_SIZE/sizeof(uint32_t)];
static mcuxClResource_Context_t * resourceCtxHandle = (mcuxClResource_Context_t *) &resourceContext;
 
/* This is the Interrupt handler for DMA done and error interrupts on the input channel.
   This function only sets the interrupt number as a global flag, the actual handler
   mcuxClResource_handle_interrupt needs to be called afterwards to wrap-up the CLib operation. */
static void handleDmaInterrupt_channel0(void)
{
  MCUX_CSSL_ANALYSIS_START_PATTERN_SFR_ACCESS()
  /* Clear DMA interrupt request status, W1C. Needed for DONE interrupts. */
  DMA0->CH[0].CH_INT = 1U;
 
  /* Clear the DMA error interrupt request status, W1C. Needed for ERROR interrupts. */
  uint32_t chCsr = DMA0->CH[0].CH_CSR;
  /* 1. Unset the DONE bit, to not accidentally perform a W1C. CLib needs this bit for internal checks. */
  chCsr &= ~((uint32_t)DMA_CH_CSR_DONE_MASK);
  /* 2. Clear the EEI bit. */
  chCsr &= ~((uint32_t)DMA_CH_CSR_EEI_MASK);
  /* 3. Write to CH_CSR */
  DMA0->CH[0].CH_CSR = chCsr;
  MCUX_CSSL_ANALYSIS_STOP_PATTERN_SFR_ACCESS()
 
  flag_interruptNumber = GET_DMA_CHX_IRQ_NUMBER(0U);
}
 
/* Initialize (install, enable) the interrupts */
static void interruptInit(void)
{
  /* Enable interrupts for the input channel */
  mcuxClExample_OS_Interrupt_Callback_Install(handleDmaInterrupt_channel0, GET_DMA_CHX_IRQ_NUMBER(0U));
 
  /* Enable the interrupts in the controller */
  mcuxClExample_OS_Interrupt_Enable(GET_DMA_CHX_IRQ_NUMBER(0U));
}
 
/* Uninitialize (disable) the interrupts */
static void interruptUninit(void)
{
  /* Disable the interrupts in the controller */
  mcuxClExample_OS_Interrupt_Disable(GET_DMA_CHX_IRQ_NUMBER(0U));
}
 
/**************************************************************************/
/* Example for non-blocking CMAC compute                                  */
/*                                                                        */
/* The example shows which functions need to be called to configure the   */
/* non-blocking flow. Its important that the interrupt is triggered on    */
/* input channel. To show the non-blocking interrupt flow a polling-loop  */
/* is used to wait for the user-callback to be triggered by an interrupt. */
/**************************************************************************/
MCUXCLEXAMPLE_FUNCTION(mcuxClMacModes_Cmac_Aes128_Compute_Dma_NonBlocking_example)
{
  /**************************************************************************/
  /* General Preparation                                                    */
  /**************************************************************************/
 
  /* Note: All DMA buffer needs to be on the stack because DMA cannot access ROM */
  const uint8_t data[40] = {
    0x6bU, 0xc1U, 0xbeU, 0xe2U, 0x2eU, 0x40U, 0x9fU, 0x96U,
    0xe9U, 0x3dU, 0x7eU, 0x11U, 0x73U, 0x93U, 0x17U, 0x2aU,
    0xaeU, 0x2dU, 0x8aU, 0x57U, 0x1eU, 0x03U, 0xacU, 0x9cU,
    0x9eU, 0xb7U, 0x6fU, 0xacU, 0x45U, 0xafU, 0x8eU, 0x51U,
    0x30U, 0xc8U, 0x1cU, 0x46U, 0xa3U, 0x5cU, 0xe4U, 0x11U
  };
 
  const uint8_t cmacReference[16] = {
    0xdfU, 0xa6U, 0x67U, 0x47U, 0xdeU, 0x9aU, 0xe6U, 0x30U,
    0x30U, 0xcaU, 0x32U, 0x61U, 0x14U, 0x97U, 0xc8U, 0x27U
  };
 
  mcuxClSession_Descriptor_t sessionDesc;
  mcuxClSession_Handle_t session = &sessionDesc;
 
  /* Allocate and initialize session */
  MCUXCLEXAMPLE_ALLOCATE_AND_INITIALIZE_SESSION_NONBLOCKING(session, MCUXCLEXAMPLE_MAX_WA(MCUXCLMAC_COMPUTE_CPU_WA_BUFFER_SIZE, MCUXCLRANDOM_NCINIT_WACPU_SIZE), 0U);
 
  /* Initialize the PRNG */
  MCUXCLEXAMPLE_INITIALIZE_PRNG(session);
 
  /* Initialize the key */
  uint32_t keyDesc[MCUXCLKEY_DESCRIPTOR_SIZE_IN_WORDS];
  MCUX_CSSL_ANALYSIS_START_PATTERN_REINTERPRET_MEMORY_OF_OPAQUE_TYPES()
  mcuxClKey_Handle_t key = (mcuxClKey_Handle_t) keyDesc;
  MCUX_CSSL_ANALYSIS_STOP_PATTERN_REINTERPRET_MEMORY_OF_OPAQUE_TYPES()
 
  MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(ki_status, ki_token, mcuxClKey_init(
    /* mcuxClSession_Handle_t session:        */ session,
    /* mcuxClKey_Handle_t key:                */ key,
    /* mcuxClKey_Type_t type:                 */ mcuxClKey_Type_Aes128,
    /* uint8_t * pKeyData:                   */ keyData,
    /* uint32_t keyDataLength:               */ sizeof(keyData))
  );
 
  if((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClKey_init) != ki_token) || (MCUXCLKEY_STATUS_OK != ki_status))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
  MCUX_CSSL_FP_FUNCTION_CALL_END();
 
  /**************************************************************************/
  /* Non-Blocking Preparation                                               */
  /**************************************************************************/
 
  /* Enable DMA interrupt and set callback */
  interruptInit();
 
  /* Configure the DMA channels that should be used. For MAC operations, the two channels will never be used at the same time.
   * Use DMA channel 0 for both HW input and output operations. */
  mcuxClSession_Channels_t dmaChannels = {
    .input = (mcuxClSession_Channel_t) 0U,
    .output = (mcuxClSession_Channel_t) 0U
  };
 
  /* Set DMA channels and user callback function */
  MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(scj_status, scj_token, mcuxClSession_configure_job(
    /* mcuxClSession_Handle_t session:          */ session,
    /* mcuxClSession_Channels_t dmaChannels,    */ dmaChannels,
    /* mcuxClSession_Callback_t pUserCallback,  */ user_callback,
    MCUX_CSSL_ANALYSIS_START_SUPPRESS_NULL_POINTER_CONSTANT("NULL is used in code")
    /* void * pUserData                        */ NULL)
    MCUX_CSSL_ANALYSIS_STOP_SUPPRESS_NULL_POINTER_CONSTANT()
  );
 
  /* Initialize resource context and add it to the session */
  if(!mcuxClExample_Session_InitAndSetResourceCtx(session, resourceCtxHandle))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
 
  if((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClSession_configure_job) != scj_token) || (MCUXCLSESSION_STATUS_OK != scj_status))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
  MCUX_CSSL_FP_FUNCTION_CALL_END();
 
  /**************************************************************************/
  /* MAC Computation                                                        */
  /**************************************************************************/
 
  uint32_t macSize = 0U;
  uint8_t macData[sizeof(cmacReference)];
 
  MCUXCLBUFFER_INIT_DMA_RO(dataBuf, session, data, sizeof(data));
  MCUXCLBUFFER_INIT_DMA(macDataBuf, session, macData, sizeof(macData));
  MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(mc_status, mc_token, mcuxClMac_compute(
    /* mcuxClSession_Handle_t session:  */ session,
    /* const mcuxClKey_Handle_t key:    */ key,
    /* const mcuxClMac_Mode_t mode:     */ mcuxClMac_Mode_CMAC_NonBlocking,
    /* mcuxCl_InputBuffer_t pIn:        */ dataBuf,
    /* uint32_t inLength:              */ sizeof(data),
    /* mcuxCl_Buffer_t pMac:            */ macDataBuf,
    /* uint32_t macLength:             */ &macSize)
  );
 
  if((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClMac_compute) != mc_token) || ((MCUXCLMAC_STATUS_JOB_STARTED != mc_status) && (MCUXCLMAC_STATUS_OK != mc_status)))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
 
  if(MCUXCLMAC_STATUS_JOB_STARTED == mc_status)
  {
    /* A non-blocking job was started. Wait for the interrupt */
    while(MCUXCLMAC_FLAG_DMA_INTERRUPT_NOT_TRIGGERED == flag_interruptNumber) {};
 
    /* Call the resource interrupt handler to finish the non-blocking operation.
     * On normal operation flow, this will trigger the user_callback function at the end,
     * which sets macStatus_nonBlockingCallback to the status code of the Mac operation.
     * On error, mcuxClResource_handle_interrupt returns an ERROR code without triggering
     * the user_callback. */
    MCUX_CSSL_FP_FUNCTION_CALL_BEGIN(rhi_status, rhi_token, mcuxClResource_handle_interrupt(resourceCtxHandle, flag_interruptNumber));
    if((MCUX_CSSL_FP_FUNCTION_CALLED(mcuxClResource_handle_interrupt) != rhi_token) || (MCUXCLRESOURCE_STATUS_OK != rhi_status))
    {
      return MCUXCLEXAMPLE_STATUS_ERROR;
    }
    MCUX_CSSL_FP_FUNCTION_CALL_END();
 
    if(MCUXCLMAC_STATUS_JOB_COMPLETED != macStatus_nonBlockingCallback)
    {
      return MCUXCLEXAMPLE_STATUS_ERROR;
    }
 
    /* Reset polling loop condition and the status code */
    flag_interruptNumber = MCUXCLMAC_FLAG_DMA_INTERRUPT_NOT_TRIGGERED;
    macStatus_nonBlockingCallback = MCUXCLMAC_STATUS_CALLBACK_NOT_EXECUTED;
  }
  MCUX_CSSL_FP_FUNCTION_CALL_END();
 
  /**************************************************************************/
  /* Destroy the current session and clean-up                               */
  /**************************************************************************/
 
  if(!mcuxClExample_Session_Clean(session))
  {
      return MCUXCLEXAMPLE_STATUS_ERROR;
  }
 
  /* Disable the interrupts */
  interruptUninit();
 
  /**************************************************************************/
  /* Verification                                                           */
  /**************************************************************************/
 
  if (macSize != sizeof(cmacReference))
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
 
  MCUX_CSSL_ANALYSIS_START_SUPPRESS_ALREADY_INITIALIZED("Initialized by MCUXCLBUFFER_INIT_DMA")
  if (!mcuxClCore_assertEqual(macData, cmacReference, sizeof(cmacReference)))
  MCUX_CSSL_ANALYSIS_STOP_SUPPRESS_ALREADY_INITIALIZED()
  {
    return MCUXCLEXAMPLE_STATUS_ERROR;
  }
 
  return MCUXCLEXAMPLE_STATUS_OK;
}