[参考译文] CC2745R10-Q1：关于加密计算时间

您好：

我将联系研发团队、收到回复（1-2 天）后、我将更新此主题。

同时、您使用哪些 API 来执行这些函数？

此致、

Nima Behmanesh

嗨、Nima、

使用的代码是将示例代码 empty.c 修改到此代码。

/*
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/*
 *  ======== sha2hash.c ========
 */
#include <stdint.h>
#include <stdio.h>
#include <string.h>

/* Driver Header files */
#include <ti/drivers/GPIO.h>
#include <ti/drivers/SHA2.h>

/* Driver configuration */
#include "ti_drivers_config.h"

#define mcU2_SEED_LENGTH 102

static uint8_t au1s_SEED[mcU2_SEED_LENGTH] = { 0x4D,0x08,0x88,0x88,0x88,0x88,0x88,0x88,0x88,0x88,
0x86,0x20,0x43,0xD6,0x05,0x52,0x69,0x99,0xF0,0x32,0xE0,0x8F,0x31,0x4F,0x22,0xEB,0xCE,0x05,
0x1D,0x1D,0xAE,0x53,0xDC,0x71,0xF1,0xC4,0xD6,0x14,0xB0,0x33,0x7B,0xB1,0x7F,0x20,
0x87,0x20,0xF9,0x8C,0xCA,0x31,0x65,0x1A,0xD2,0xE6,0x32,0x66,0x14,0x4B,0x24,0x50,0xFD,0x60,
0x81,0xD8,0xFE,0xA8,0xCE,0xB8,0x26,0xE1,0xFB,0x10,0xE8,0x03,0x4E,0x93,0x24,0x46,
0x4C,0x10,0xBF,0x1C,0x41,0x26,0x82,0x30,0xAF,0x76,0xBF,0xFE,0x3E,0x7C,0x5D,0x00,0xCF,0x4A,
0x93,0x04,0x41,0x5D,0x95,0x69
};


static uint8_t au1s_K[32];

void callbackFxn(SHA2_Handle handle, int_fast16_t returnStatus)
{
    /* LED OFF */
    GPIO_write(CONFIG_GPIO_LED_0, CONFIG_GPIO_LED_OFF);
}


/*
 *  ======== mainThread ========
 */
void *mainThread(void *arg0)
{    
    SHA2_Params params;
    SHA2_Handle handle;
    int_fast16_t result;

    GPIO_init();

    /* LED ON */
    GPIO_write(CONFIG_GPIO_LED_0, CONFIG_GPIO_LED_ON);


    /* SHA-256演算 */
    SHA2_init();
    SHA2_Params_init(&params);
    params.hashType = SHA2_HASH_TYPE_256;
    params.returnBehavior = SHA2_RETURN_BEHAVIOR_CALLBACK;
    params.callbackFxn = callbackFxn;
    handle = SHA2_open(0, &params);

    result = SHA2_hashData(handle, au1s_SEED, mcU2_SEED_LENGTH, au1s_K);

    SHA2_close(handle);

    while(1)
    {
    }

}

此外、测量速度减慢 7ms 的原因可能不是 SDK 中的差异造成的、而是测量分辨率的差异造成的。
在 100ms/s 下测量时、测量值为 7.2ms、但在 50ms/s 下测量时、测量值为 0.2ms。

尽管如此、7ms 似乎对于 SHA256 计算来说时间太长、因此请检查是否可以通过设置更快地进行计算。