Use SHA256d Crypo Engine on 7697

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "hal_sha.h"

hal_sha256_context_t context;
uint8_t digest[HAL_SHA256_DIGEST_SIZE];
char *payload = "abcdefg";
uint8_t *message;
hal_sha_status_t ret;

#define CONFIG_BENCHMARK 1

// Benchmark
#ifdef CONFIG_BENCHMARK
long currentMillis = 0;
long lastMillis = 0;
long loops = 0;
#endif

void setup() {
  Serial.begin(9600);

  hal_sha256_init(&context);
  
#ifdef CONFIG_BENCHMARK  
  currentMillis = lastMillis = millis();
#endif  
}

void loop() {  
#ifdef CONFIG_BENCHMARK  
  loops = 0;
  lastMillis = millis();
#endif
  
  message = (uint8_t*)payload;

#ifdef CONFIG_BENCHMARK
  while (currentMillis - lastMillis < 1000) {
#endif

    hal_sha256_append(&context, message, strlen(payload));
    ret = hal_sha256_end(&context, digest); 
    
#ifdef CONFIG_BENCHMARK    
    loops++;
    currentMillis = millis();
  }
  
   Serial.print("Loops last second: ");
   Serial.println(loops);
#endif   
 }