CC1310: ECC_generateKey causing exception

Dillon Wiggins

Part Number: CC1310

I am attempting to port the aesKeyAgreement_CC1310_LAUNCHXL_tirtos_ccs example to an existing RF project. Something is causing ECC_generateKey to cause an exception and never return.

The ported code includes

#pragma LOCATION(romCryptoOutputBuffer, ROM_CRYPTO_BUFFER_ADDR);
uint8_t romCryptoOutputBuffer[ROM_CRYPTO_BUFFER_SIZE];
/* This memset informs the compiler that we intend to make use of the
 * buffer so it does not get optimised out. */
memset(romCryptoOutputBuffer, 0, ROM_CRYPTO_BUFFER_SIZE);

/* Allocate workzone memory for ecc, recommended workzone size is 275 bytes */
uint32_t *workzone = (uint32_t *) malloc(ECC_WORKZONE_SIZE * ECC_WINDOW_SIZE);
if (workzone == NULL) {
    while(1);
}

/* Initialize ECC with a pointer to the allocated workzone */
ECC_initialize(workzone);

It still appears something is not correct. I am able to execute the example project successfully, but not when the code is used in a different project.

Are there other project settings required?

Software versions:

CCS v10.0.0.00010

SimpleLink CC13x0 SDK v3.20.00.23

over 5 years ago

0 Dillon Wiggins over 5 years ago

Intellectual 400 points

I found the issue. Looks like the call to ECC_initialize() was happening before initializing the memory and Crypto module.

Calling in the below order seems to have fixed the issue

    TRNG_init();
    CryptoCC26XX_init();
    memset(romCryptoOutputBuffer, 0, ROM_CRYPTO_BUFFER_SIZE);
    /* Allocate workzone memory for ecc - recommended workzone size is 275 bytes */
    uint32_t *workzone = (uint32_t *)malloc(ECC_WORKZONE_SIZE * ECC_WINDOW_SIZE);
    if (workzone == NULL) {
        while(1);
    }
    ECC_initialize(workzone);

0 Marie H over 5 years ago in reply to Dillon Wiggins

TI__Guru* 82431 points

Hi Dillon,

Thank you for posting the solution!

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CC1310: ECC_generateKey causing exception