コード例 #1
0
/**
 *
 * \brief Generates a random bytes stream. The ATECCX08 TRNG is
 *        used to seed a standard OpenSSL PRNG (RAND_SSLeay()),
 *        which is used to produce the random stream then. The
 *        PRNG is reseeded after MAX_RAND_BYTES are generated
 *
 * \param[out] buf - a pointer to buffer for the random byte
 *       stream. The caller must allocate enough space in the
 *       buffer in order to fit all generated bytes.
 * \param[in] num - number of bytes to generate
 * \return 1 for success
 */
static int RAND_eccx08_rand_bytes(unsigned char *buf, int num)
{
    int rc = 0;
    uint32_t atcab_buf[TLS_RANDOM_SIZE / sizeof(uint32_t)];
    double entropy;
    RAND_METHOD *meth_rand = RAND_SSLeay();
    ATCA_STATUS status = ATCA_GEN_FAIL;

#ifdef USE_ECCX08
    if (total_num > MAX_RAND_BYTES) {
        total_num = 0;
    }
    if (total_num == 0) {
        eccx08_debug("RAND_eccx08_rand_bytes() -  hw\n");
        status = atcatls_init(pCfg);
        if (status != ATCA_SUCCESS) goto done;
        status = atcatls_random((uint8_t *)atcab_buf);
        if (status != ATCA_SUCCESS) goto done;
        status = atcatls_finish();
        if (status != ATCA_SUCCESS) goto done;
        entropy = (double)atcab_buf[0];
        meth_rand->add(buf, num, entropy);
    }
    total_num += num;
#else // USE_ECCX08
    eccx08_debug("RAND_eccx08_rand_bytes() - sw\n");
#endif // USE_ECCX08
    rc = meth_rand->bytes(buf, num);

done:
    return (rc);
}
コード例 #2
0
ファイル: atmel.c プロジェクト: govindtank/bb-bot
/**
 * \brief Generate random number to be used for hash.
 */
int atmel_get_random_number(uint32_t count, uint8_t* rand_out)
{
	int ret = 0;
#ifdef WOLFSSL_ATECC508A
	uint8_t i = 0;
	uint32_t copy_count = 0;
	uint8_t rng_buffer[RANDOM_NUM_SIZE];

	if (rand_out == NULL) {
		return -1;
	}

	while(i < count) {

		ret = atcatls_random(rng_buffer);
		if (ret != 0) {
			WOLFSSL_MSG("Failed to create random number!");
			return -1;
		}
		copy_count = (count - i > RANDOM_NUM_SIZE) ? RANDOM_NUM_SIZE : count - i;
		XMEMCPY(&rand_out[i], rng_buffer, copy_count);
		i += copy_count;
	}
    atcab_printbin_label((const uint8_t*)"\r\nRandom Number", rand_out, count);
#else
    // TODO: Use on-board TRNG
#endif
	return ret;
}
コード例 #3
0
ファイル: atcatls.c プロジェクト: lavanchy/IoT_security
/** \brief Initialize the unique encryption key for this platform.
 *		Write a random number to the parent encryption key slot
 *		Return the random number for storage on platform
 *  \param[out] enckeyout Pointer to a random 32 byte encryption key that will be stored on the platform and in the device
 *  \param[in] enckeyId Slot id on the ECC508 to store the encryption key
 *  \param[in] lock If this is set to true, the slot that stores the encryption key will be locked
 *  \return ATCA_STATUS
 */
ATCA_STATUS atcatls_init_enckey(uint8_t* enckeyout, uint8_t enckeyId, bool lock)
{
	ATCA_STATUS status = ATCA_SUCCESS;

	do {
		// Verify input parameters
		if (enckeyout == NULL) {
			status = ATCA_BAD_PARAM;
			BREAK(status, "NULL inputs");
		}
		// Get a random number
		if ((status = atcatls_random(enckeyout)) != ATCA_SUCCESS) BREAK(status, "Random command failed");

		// Write the random number as the encryption key
		atcatls_set_enckey(enckeyout, enckeyId, lock);

	} while (0);

	return status;
}