XIAO nRF52840(mbed) 1-Central 2-Peripherals Project "Sleeping Posture, Heart rate, Pulse oximetry Monitor"

Honvl · May 8, 2023, 3:03am

Nrf52840 contains cryptographic functionality that may be able to encrypt and decrypt messages using a shared secret key.

github.com

adafruit/Adafruit_nRFCrypto/blob/master/examples/hmac/hmac.ino

#include "Adafruit_nRFCrypto.h"
#include <Adafruit_TinyUSB.h> // for Serial

/* Input data for testing
 * to verify the result, run openssl on your PC
 * and compare the result with this sketch
 *
 *  $ echo -ne "Hello World!" | openssl dgst -sha1 -hmac "secret"
 *    (stdin)= 5efed98b0787c83f9cb0135ba283c390ca49320e
 *
 *  $ echo -ne "Hello World!" | openssl dgst -sha224 -hmac "secret"
 *    (stdin)= d1f9ff720c7558366f2b67e672b4f4ee7cb58b5803cd9e46380123f2
 *
 *  $ echo -ne "Hello World!" | openssl dgst -sha256 -hmac "secret"
 *    (stdin)= 6fa7b4dea28ee348df10f9bb595ad985ff150a4adfd6131cca677d9acee07dc6
 *
 *  $ echo -ne "Hello World!" | openssl dgst -sha512 -hmac "secret"
 *    (stdin)= fd3716eb8e1903ecb8deb9320f1baecf0f8dbe04e4c4c71e64fbb37080222ca42deb0b646cabeb53e269a2446507fb5442961656f8007959bd330ef48df0e13e
*/
uint8_t input_data[] = // "Hello World!"

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