#include "md.h"


const char * sha1(const char * payloadStr) {
  const char *payload = payloadStr;
  int size = 20;
  byte shaResult[size];
  mbedtls_md_context_t ctx;
  mbedtls_md_type_t md_type = MBEDTLS_MD_SHA1;
  const size_t payloadLength = strlen(payload);
  mbedtls_md_init(&ctx);
  mbedtls_md_setup(&ctx, mbedtls_md_info_from_type(md_type), 0);
  mbedtls_md_starts(&ctx);
  mbedtls_md_update(&ctx, (const unsigned char *) payload, payloadLength);
  mbedtls_md_finish(&ctx, shaResult);
  mbedtls_md_free(&ctx);
  String hashStr = "";
  for (uint16_t i = 0; i < size; i++) {
    String hex = String(shaResult[i], HEX);
    if (hex.length() < 2) {
      hex = "0" + hex;
    }
    hashStr += hex;
  }
  return hashStr.c_str();
}

void setup()
{
Serial.begin(115200);

char *payload = "Hello SHA 256 from ESP32learning";
byte shaResult[32];

mbedtls_md_context_t ctx;
mbedtls_md_type_t md_type = MBEDTLS_MD_SHA256;

const size_t payloadLength = strlen(payload);

mbedtls_md_init(&ctx);
mbedtls_md_setup(&ctx, mbedtls_md_info_from_type(md_type), 0);
mbedtls_md_starts(&ctx);
mbedtls_md_update(&ctx, (const unsigned char *) payload, payloadLength);
mbedtls_md_finish(&ctx, shaResult);
mbedtls_md_free(&ctx);

Serial.print("Hash: ");

for(int i= 0; i< sizeof(shaResult); i++)
{
char str[3];
sprintf(str, "%02x", (int)shaResult[i]);
Serial.print(str);
}

Serial.println("");
const char * s="Hash: ";
Serial.println(sha1("Georgi"));
}

void loop()
{
}