encode_hash.cpp

#include <Arduino.h>
#include "rom/md5_hash.h"
extern "C" {
  #include "crypto/base64.h"
}

void setup() {
  Serial.begin(9600);
  
  const char* message = "Hello World";

  size_t outputLen;
  unsigned char *encode = base64_encode((const unsigned char*)message, strlen(message), &outputLen);
  unsigned char *decode = base64_decode(encode, outputLen, &outputLen);

  unsigned char md5Out[16];
  struct MD5Context md5Context;

  MD5Init(&md5Context);
  MD5Update(&md5Context, (const unsigned char *)message, strlen(message));
  MD5Final(md5Out, &md5Context);

  Serial.print("plaintext : "); Serial.println(message);
  Serial.print("encode    : "); Serial.println((char*)encode);
  Serial.print("decode    : "); Serial.println((char*)decode);

  for (int i = 0; i < sizeof(md5Out); i++) {
    Serial.print(md5Out[i], HEX);
  } Serial.println();
}

void loop() {
  
}