From be846db403c29c77bfb72633d87a7c72a48562b6 Mon Sep 17 00:00:00 2001
From: Stefan Suhren <suhren.stefan@fh-swf.de>
Date: Wed, 15 Apr 2015 12:44:35 +0200
Subject: Adds multiple rotors and comments

---
 src/crypt/cryptclasscaesar.cpp | 66 +++++++++++++++++++++++++++++++++++-------
 1 file changed, 56 insertions(+), 10 deletions(-)

(limited to 'src/crypt/cryptclasscaesar.cpp')

diff --git a/src/crypt/cryptclasscaesar.cpp b/src/crypt/cryptclasscaesar.cpp
index e2fdf50..f2d0960 100644
--- a/src/crypt/cryptclasscaesar.cpp
+++ b/src/crypt/cryptclasscaesar.cpp
@@ -3,61 +3,83 @@
 const int CryptClassCaesar::LOWERBOUND = 'A';
 const int CryptClassCaesar::UPPERBOUND = 'Z';
 
+/**
+ * @brief CryptClassCaesar::CryptClassCaesar constructor for caesar encryption
+ */
 CryptClassCaesar::CryptClassCaesar()
 {
-    mapOffset = 0;
-    buildMap();
+    qDebug("CryptClassCaesar::CryptClassCaesar()");
 }
 
+/**
+ * @brief CryptClassCaesar::~CryptClassCaesar destructor for caesar encryption
+ */
 CryptClassCaesar::~CryptClassCaesar()
 {
-
+    qDebug("CryptClassCaesar::~CryptClassCaesar()");
 }
 
+/**
+ * @brief CryptClassCaesar::encrypt encrypt the PlainText with the specific rotation
+ */
 void CryptClassCaesar::encrypt()
 {
-    qDebug("CryptClassCaesar::encrypt");
+    qDebug() << "CryptClassCaesar::encrypt()";
 
+    buildMap();
+    // convert into upper letters
     m_clearText = m_clearText.toUpper();
+    // clear cryptText
     m_cryptText.clear();
+    // Set offset into 0
     mapOffset = 0;
-
+    // Space counter
     int spaceCount = 0;
 
     for (int i = 0; i < m_clearText.size(); i++)
     {
+        // only accept letters between 'A' and 'Z'
         if (m_clearText[i] >= (char) LOWERBOUND && m_clearText[i] <= (char) UPPERBOUND)
         {
+            // encrypt Letters and rotate roter
             m_cryptText.append(substitutionsMap[LOWERBOUND + (((m_clearText[i] - LOWERBOUND)
                                                 + mapOffset++) % (26))]);
 
+            // insert spaces
             if (!(++spaceCount % 5))
             {
                 m_cryptText.append(" ");
             }
         }
     }
-
 }
 
+/**
+ * @brief CryptClassCaesar::decrypt encrypt the PlainText with the specific rotation
+ */
 void CryptClassCaesar::decrypt()
 {
-    qDebug("CryptClassCaesar::decrypt");
+    qDebug("CryptClassCaesar::decrypt()");
 
+    buildMap();
     int tmp = 0;
 
     m_cryptText = m_cryptText.toUpper();
-
+    // delete clear text
     m_clearText.clear();
+    // set offset into 0
     mapOffset = 0;
 
     for (int i = 0; i < m_cryptText.size(); i++)
     {
+        // only accept letters between 'A' and 'Z'
         if (m_cryptText[i] >= (char) LOWERBOUND && m_cryptText[i] <= (char) UPPERBOUND)
         {
+            // decrypt letters and rotate rotor backwards
             tmp = ((substitutionsMap.key(m_cryptText[i]) - LOWERBOUND) - mapOffset++) %
                   (26);
 
+            // to hack the modulo operator
             if (tmp < 0)
             {
                 //Because tmp is negative adding it to UPPERBOUND subtracts it
@@ -72,14 +94,38 @@ void CryptClassCaesar::decrypt()
     }
 }
 
+/**
+ * @brief CryptClassCaesar::buildMap fill the map with information
+ */
 void CryptClassCaesar::buildMap()
 {
-    char tmp[] = "EKMFLGDQVZNTOWYHXUSPAIBRCJ";
+    bool ok = false;
+    int rotor = getKey().toInt(&ok);
+
+    if (ok == false || rotor < 1 || rotor > 5)
+    {
+        QMessageBox::warning(NULL, "Key invalid",
+                             "The key for Enigma should only be a number between 1 and 5.");
+        return;
+    }
+
+    rotor--;
 
+    // Char Array to simple implement the rotor
+    char rotors[5][27] =
+    {
+        "EKMFLGDQVZNTOWYHXUSPAIBRCJ",
+        "AJDKSIRUXBLHWTMCQGZNPYFVOE",
+        "BDFHJLCPRTXVZNYEIWGAKMUSQO",
+        "ESOVPZJAYQUIRHXLNFTGKDCMWB",
+        "VZBRGITYUPSDNHLXAWMJQOFECK"
+    };
+
+    // Clear substitution Map
     substitutionsMap.clear();
 
     for (int i = 0; i <= (UPPERBOUND - LOWERBOUND); i++)
     {
-        substitutionsMap.insert((char)(LOWERBOUND + i), tmp[i]);
+        substitutionsMap.insert((char)(LOWERBOUND + i), rotors[rotor][i]);
     }
 }
-- 
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