/**
 * @file sdrv_crypto_mailbox_trng.c
 * @brief crypto mailbox trng cmd interface
 *
 * @copyright Copyright (c) 2021  Semidrive Semiconductor.
 *            All rights reserved.
 */

#include <sdrv_crypto_mailbox_trng.h>

/**
 * @brief get trng
 *
 * This function get trng
 *
 * @param[out] rand_output rand buff
 * @param[in] rand_bytes rand len
 */
sdrv_crypto_error_status_e cmd_trng_get_rand(uint8_t *rand_output,
                                             uint32_t rand_bytes)
{
    sdrv_crypto_error_status_e RetVal = CMD_RETURN_FAIL;
    uint32_t cmd_buf[8] = {0};
    uint32_t ret;
    uint32_t *rand;
    uint8_t count;
    cmd_tng_t *cmd_get_random = NULL;

    rand = (uint32_t *)rand_output;
    cmd_get_random = (cmd_tng_t *)cmd_buf;
    cmd_get_random->cmd_id = GENERATE_RAND;

    set_big_endian_4byte((uint8_t *)cmd_get_random->random_ptr, (uint32_t)rand);
    set_big_endian_4byte((uint8_t *)cmd_get_random->random_len,
                         (uint32_t)rand_bytes);

    count = RETRY_COUNT;
    do {
        ret = send_cmd_and_wait_response((uint32_t *)cmd_buf);
        if (SEIP_SUCCESS == ret) {
            RetVal = CMD_RETURN_SUCCESS;
            break;
        } else if (SEIP_ERROR_TRNG_FAIL == ret) {
            RetVal = CMD_RETURN_FAIL;
            /* retry */
        } else {
            RetVal = CMD_RETURN_FAIL;
            break;
        }

        count--;
    } while (count);

    return RetVal;
}