Adding examples

Author: Luigi Gubello

Diff for: examples/AES128/AES128.ino

@@ -0,0 +1,64 @@
+/*
+  ArduinoCrypto AES128 Example
+
+  This sketch demonstrates how to run AES128 encryption and decryption for an input string.
+
+  Circuit:
+  - Nano 33 IoT board
+
+  created 13 July 2020
+  by Luigi Gubello
+
+  This example code is in the public domain.
+*/
+
+#include <ArduinoBearSSL.h>
+
+uint8_t key[16] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02};
+uint8_t enc_iv[16] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01};
+uint8_t dec_iv[16] = {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01};
+uint8_t input[16] = "ArduinoArduino"; // {0x41,0x72,0x64,0x75,0x69,0x6E,0x6F,0x41,0x72,0x64,0x75,0x69,0x6E,0x6F,0x00,0x00}
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+}
+
+void loop() {
+
+  Serial.print("Key: ");
+  printHex(key, 16);
+  Serial.println(" ");
+  Serial.print("IV: ");
+  printHex(enc_iv, 16);
+  Serial.println(" ");
+  Serial.print("AES128 Encryption of '");
+  printHex(input, 16);
+  Serial.print("' is 0x");
+  AES128.runEnc(key, 16, input, 16, enc_iv);   // expect 0x65D0F7758B094114AFA6D33A5EA0716A
+  printHex(input, 16);
+  Serial.println(" ");
+  Serial.println(" ");
+  Serial.print("Key: ");
+  printHex(key, 16);
+  Serial.println(" ");
+  Serial.print("IV: ");
+  printHex(dec_iv, 16);
+  Serial.println(" ");
+  Serial.print("AES128 Decryption of '");
+  printHex(input, 16);
+  Serial.print("' is 0x");
+  AES128.runDec(key, 16, input, 16, dec_iv);
+  printHex(input, 16);
+  Serial.println(" ");
+  while (1);
+}
+
+void printHex(uint8_t *text, size_t size) {
+  for (byte i = 0; i < size; i = i + 1) {
+    if (text[i] < 16) {
+      Serial.print("0");
+    }
+    Serial.print(text[i], HEX);
+  }
+}

Diff for: examples/DES/DES.ino

@@ -0,0 +1,64 @@
+/*
+  ArduinoCrypto DES Example
+
+  This sketch demonstrates how to run DES encryption and decryption for an input string.
+
+  Circuit:
+  - Nano 33 IoT board
+
+  created 13 July 2020
+  by Luigi Gubello
+
+  This example code is in the public domain.
+*/
+
+#include <ArduinoBearSSL.h>
+
+uint8_t key[8] = {0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x02};
+uint8_t enc_iv[8] = {0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01};
+uint8_t dec_iv[8] = {0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01};
+uint8_t input[8] = "Arduino"; // {0x41,0x72,0x64,0x75,0x69,0x6E,0x6F,0x00}
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+}
+
+void loop() {
+
+  Serial.print("Key: ");
+  printHex(key, 8);
+  Serial.println(" ");
+  Serial.print("IV: ");
+  printHex(enc_iv, 8);
+  Serial.println(" ");
+  Serial.print("DES Encryption of '");
+  printHex(input, 8);
+  Serial.print("' is 0x");
+  DES.runEnc(key, 8, input, 8, enc_iv);   // expect 0x3C21EB6A62D372DB
+  printHex(input, 8);
+  Serial.println(" ");
+  Serial.println(" ");
+  Serial.print("Key: ");
+  printHex(key, 8);
+  Serial.println(" ");
+  Serial.print("IV: ");
+  printHex(dec_iv, 8);
+  Serial.println(" ");
+  Serial.print("DES Decryption of '");
+  printHex(input, 8);
+  Serial.print("' is 0x");
+  DES.runDec(key, 8, input, 8, dec_iv);
+  printHex(input, 8);
+  Serial.println(" ");
+  while (1);
+}
+
+void printHex(uint8_t *text, size_t size) {
+  for (byte i = 0; i < size; i = i + 1) {
+    if (text[i] < 16) {
+      Serial.print("0");
+    }
+    Serial.print(text[i], HEX);
+  }
+}