work in progress

059/main.cpp

@@ -12,7 +12,7 @@ Your task has been made easy, as the encryption key consists of three lower case
 
 #include <vector>
 #include <iostream>
-
+#include <fstream>
 
 using namespace std;
 
@@ -20,5 +20,66 @@ int main(){
 
     cout << "Hello this is Patrick" << endl;
 
+    ifstream inFile;
+    inFile.open("../txts/cipher.txt");
+
+    if(!inFile){
+        cerr << "Unable to open file: ../txts/cipher.txt" << endl;
+        exit(1);
+    }
+
+    vector<unsigned char> encrypted;
+    while(true){
+        unsigned int current;
+        inFile >> current;
+
+        if(!inFile) break;
+
+        encrypted.push_back(current);
+        inFile.get();
+    }
+    encrypted.pop_back();
+
+    inFile.close();
+
+    for(unsigned char i = 'a'; i <= 'z'; ++i){
+        for(unsigned char j = 'a'; j <= 'z'; ++j){
+            for(unsigned char k = 'a'; k <= 'z'; ++k){
+                const unsigned char key[] = {i,j,k};
+
+                vector<unsigned char> decoded;
+                for(size_t pos = 0; pos < encrypted.size(); ++pos){
+                    decoded.push_back(encrypted[pos] ^ key[pos % 3]);
+                }
+
+                bool valid = true;
+                for(auto d : decoded){
+                    valid  = (d >= '0' && d <= '9');
+                    valid |= (d >= 'a' && d <= 'z');
+                    valid |= (d >= 'A' && d <= 'Z');
+                    valid |= (d == ' ' || d == ',' || d == '.' || d == '?' || d == '!');
+                    valid |= (d == ';' || d == ':' || d == '-' || d == '\'' || d == '(' || d == ')');
+
+                    if(!valid){
+                        break;
+                    }
+                }
+
+                if(!valid){
+                    continue;
+                }
+
+                unsigned int asciiSum = 0;
+                for(auto d : decoded){
+                    asciiSum += d;
+                    cout << d;
+                }
+                cout << endl;
+                cout << asciiSum << endl;
+                return 0;
+            }
+        }
+    }
+
     return 0;
 }