Dweeno

me (AT) this domain (Yusuf Hegazy) — Sun, 01 May 2022 00:00:00 +0000

Serial Output

Wiring Diagram

Arduino Code

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char * flag = "REDACTED";
String curr, first, second;
int in1=29, in2=27, in3=25, in4=23;
int out1=53, out2=51, out3=49, out4=47;
int i;

String get_output(String bits) {
 String output;
 digitalWrite(out1, ((bits[0] == '1')? HIGH : LOW));
 digitalWrite(out2, ((bits[1] == '1')? HIGH : LOW));
 digitalWrite(out3, ((bits[2] == '1')? HIGH : LOW));
 digitalWrite(out4, ((bits[3] == '1')? HIGH : LOW));
 delay(1000);
 output += String(digitalRead(in1));
 output += String(digitalRead(in2));
 output += String(digitalRead(in3));
 output += String(digitalRead(in4));
 return output;
}

//converts a given number into binary
String binary(int number) {
 String r;
 while(number!=0) {
 r = (number % 2 == 0 ? "0" : "1")+r;
 number /= 2;
 }
 while ((int) r.length() < 8) {
 r = "0"+r;
 }
 return r;
}

void setup() {
 i = 0;
 pinMode(out1, OUTPUT);
 pinMode(out2, OUTPUT);
 pinMode(out3, OUTPUT);
 pinMode(out4, OUTPUT);
 pinMode(in1, INPUT);
 pinMode(in2, INPUT);
 pinMode(in3, INPUT);
 pinMode(in4, INPUT);
 Serial.begin(9600);
}

void loop() {
 if (i < strlen(flag)) {
 curr = binary(flag[i]);
 first = curr.substring(0,4);
 second = curr.substring(4,8);
 Serial.print(get_output(first));
 Serial.println(get_output(second));
 delay(1000);
 i++;
 }
}

Looking at the code we can break it down into a couple of steps:

Hardware on Hegzploit

Dweeno