Add ECC508 key slot CSR generation support

Author: sandeepmistry

examples/Tools/ECC508CSR/ECC508CSR.ino

@@ -0,0 +1,85 @@
+#include <ArduinoBearSSL.h>
+#include <utility/ECC508.h>
+#include <utility/ECC508CSR.h>
+
+void setup() {
+  Serial.begin(9600);
+  while (!Serial);
+
+  if (!ECC508.begin()) {
+    Serial.println("No ECC508 present!");
+    while (1);
+  }
+
+  Serial.println("Hi there, in order to generate a new CSR for your board, we'll need the following information ...");
+  Serial.println();
+
+  String country            = promptAndReadLine("Country Name (2 letter code): ");
+  String stateOrProvince    = promptAndReadLine("State or Province Name (full name): ");
+  String locality           = promptAndReadLine("Locality Name (eg, city): ");
+  String organization       = promptAndReadLine("Organization Name (eg, company): ");
+  String organizationalUnit = promptAndReadLine("Organizational Unit Name (eg, section): ");
+  String common             = promptAndReadLine("Common Name (e.g. server FQDN or YOUR name): ");
+  String slot               = promptAndReadLine("What ECC508 slots would you like to use? (0 - 7): ");
+  String generateNewKey     = promptAndReadLine("Would you like to generate a new private key? (y/N): ");
+
+  Serial.println();
+
+  generateNewKey.toLowerCase();
+
+  if (!ECC508CSR.begin(slot.toInt(), generateNewKey.startsWith("y"))) {
+    Serial.println("Error starting CSR generation!");
+    while (1);
+  }
+
+  ECC508CSR.setCountryName(country);
+  ECC508CSR.setStateProvinceName(stateOrProvince);
+  ECC508CSR.setLocalityName(locality);
+  ECC508CSR.setOrganizationName(organization);
+  ECC508CSR.setOrganizationalUnitName(organizationalUnit);
+  ECC508CSR.setCommonName(common);
+
+  String csr = ECC508CSR.end();
+
+  if (!csr) {
+    Serial.println("Error generating CSR!");
+    while (1);
+  }
+
+  Serial.println("Here's your CSR, enjoy!");
+  Serial.println();
+  Serial.println(csr);
+}
+
+void loop() {
+  // do nothing
+}
+
+
+String promptAndReadLine(const char* prompt) {
+  Serial.print(prompt);
+  String s = readLine();
+  Serial.println(s);
+
+  return s;
+}
+
+String readLine() {
+  String line;
+
+  while (1) {
+    if (Serial.available()) {
+      char c = Serial.read();
+
+      if (c == '\r') {
+        // ignore
+      } else if (c == '\n') {
+        break;
+      }
+
+      line += c;
+    }
+  }
+
+  return line;
+}