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SIMPLELINK-MSP432-SDK: TI Drivers Crypto Acceleration

Mike_d
Expert 1005 points

Part Number: SIMPLELINK-MSP432-SDK
Other Parts Discussed in Thread: SYSCONFIG

Hi,

Do the TI drivers such as C:\ti\simplelink_msp432e4_sdk_4_20_00_12\source\ti\drivers\aesecb use hardware acceleration?  I don't see the module initialization as in driverlib.

Regards,

-Mike

  • 0
    TI__Guru**** 191886 points

    Hi Mike,

      I will investigate and get back. I tend to think it uses the AES modules as stated in sysconfig description. After AESECB is added, the generated file ti_drivers_config.c and ti_drivers_config.h files are updated.

    In the meantime, here is the user's guide for AESECB. https://software-dl.ti.com/simplelink/esd/simplelink_msp432e4_sdk/3.40.00.08/docs/tidrivers/doxygen/html/_a_e_s_e_c_b_8h.html#a4f4274c6aa928e8e10d3e516e73f77ea

  • +1 in reply to Charles Tsai
    TI__Guru**** 191886 points

    Hi Mike,

      Sorry for the late response. Doing some searching on the SDK, I can find that in several driver files where the AES module is being initialized. Below is a snippet of code for C:\ti\simplelink_msp432e4_sdk_4_20_00_12\source\ti\drivers\aescbc\AESCBCMSP432E4.c where you can find AES module is being reset, initialized and configured. 

        AESReset(AES_BASE);
    AESConfigSet(AES_BASE, AES_CFG_MODE_CBC |
                           AES_CTRL_SAVE_CONTEXT |
                           keySizeConfig |
                           (operationType == AESCBC_OPERATION_TYPE_ENCRYPT ? AES_CFG_DIR_ENCRYPT : AES_CFG_DIR_DECRYPT));

    AESIVSet(AES_BASE, (uint32_t*)&operation->iv[0]);
    AESKey1Set(AES_BASE, (uint32_t*)key->keyMaterial, keySizeConfig);
    AESLengthSet(AES_BASE, operation->inputLength);

    if (object->returnBehavior == AESCBC_RETURN_BEHAVIOR_POLLING)
    {
        object->returnStatus = AESCBC_doPollingMode(operation);

        AESIVRead(AES_BASE, (uint32_t *)object->iv);

        if (object->threadSafe == true) {
            CryptoResourceMSP432E4_AES_SHA2_releaseLock();
        }
    }
    else if (object->returnBehavior == AESCBC_RETURN_BEHAVIOR_CALLBACK)
    {
        object->returnStatus = AESCBC_STATUS_SUCCESS;

        CryptoResourceMSP432E4_setHwiCallback(AESCBC_hwiFxn, handle, hwAttrs->intPriority);

        dma = UDMAMSP432E4_open();
        DebugP_assert(dma != NULL);

        /* Kick the DMA state machine. */
        AESCBC_nextState = AESCBC_doSetupState;
        HwiP_post(INT_AES0);
    }
    else if (object->returnBehavior == AESCBC_RETURN_BEHAVIOR_BLOCKING)
    {
        object->returnStatus = AESCBC_STATUS_SUCCESS;

        CryptoResourceMSP432E4_setHwiCallback(AESCBC_hwiFxn, handle, hwAttrs->intPriority);

        dma = UDMAMSP432E4_open();
        DebugP_assert(dma != NULL);

        /* Kick the DMA state machine. */
        AESCBC_nextState = AESCBC_doSetupState;
        HwiP_post(INT_AES0);

        /* Wait for the DMA state machine to complete. */
        SemaphoreP_pend(CryptoResourceMSP432E4_AES_SHA2_operationSemaphore, (uint32_t)SemaphoreP_WAIT_FOREVER);
    }
    return object->returnStatus;
}