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calebTree · May 6, 2021 · 203ecda · 203ecda
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diff --git a/ceasar-cipher.cpp b/ceasar-cipher.cpp
@@ -0,0 +1,96 @@
+//
+// Created by caleb on 5/5/2021.
+//
+#include "ceasar-cipher.h"
+#include <iostream>
+using namespace std;
+
+void encryption(const string &plainAlpha, char &discard) {
+    int key;
+    string message, cipherAlphabet, cipherText;
+
+    // input number of places to shift left
+    cout << "Enter your chosen cipher key. (integer, 1-25): ";
+    cin >> key;
+    // input validation
+    if (key > 25 || key < 1) {
+        while (key > 25 || key < 1) {
+            cout << "Error! Enter an integer between 1 and 25: ";
+            cin >> key;
+        }
+    }
+    cin.get(discard);                                                   // discard \n
+    cout << "Enter the message to encrypt. (lowercase, roman alpha): ";     // input message to encrypt
+    getline(cin, message);
+
+    // shift alphabet [key] letters to the left
+    cipherAlphabet = cipherAlpha(key, plainAlpha);
+    // encrypt the message using the cipher alphabet
+    cipherText = cipherMessage(cipherAlphabet, plainAlpha, message);
+
+    cout << "\nPlaintext: " << message << endl;
+    cout << "Plain alphabet:  " << plainAlpha << "." << endl;
+    cout << "Cipher alphabet: " << cipherAlphabet << "; Shifted [" << key << "] place(s) to the left." << endl;
+    cout << "Ciphertext: " << cipherText << endl << endl;
+}
+
+void decryption(const string &plainAlpha, char &discard) {
+    int key;
+    string cipherText;
+
+    cout << "Enter the known cipher key. (integer, 1-25): ";
+    cin >> key;
+    // input validation
+    if (key > 25 || key < 1) {
+        while (key > 25 || key < 1) {
+            cout << "Error! Enter an integer between 1 and 25: ";
+            cin >> key;
+        }
+    }
+    cin.get(discard);                                                   // discard \n
+    cout << "Enter the message to decrypt. (lowercase, roman alpha): ";     // input message to decrypt
+    getline(cin, cipherText);
+
+    cout << "\nCiphertext: " << cipherText << endl;
+    cout << "Plain alphabet:  " << plainAlpha << "." << endl;
+    cout << "Cipher alphabet: " << cipherAlpha(key, plainAlpha) << "; Shifted [" << key << "] place(s) to the left." << endl;
+    // display decrypted message
+    cout << "Plaintext: " << decrypt(cipherText, plainAlpha, key) << endl << endl;
+}
+
+string cipherAlpha(int &key, const string &plainAlpha) {
+    string cipherAlpha = plainAlpha;                // cypherAlpha same size as plainAlpha
+    int p = 0;                                      // wrap around variable
+    for (int i = 0; i < plainAlpha.size(); i++) {
+        if (i + key >= plainAlpha.size()) {         // wrap around when i + key >= 26
+            cipherAlpha[i] = plainAlpha[p];         // shift cipherAlpha
+            p++;
+        } else {
+            cipherAlpha[i] = plainAlpha[i + key];   // shift cipherAlpha
+        }
+    }
+    return cipherAlpha;
+}
+
+string cipherMessage(const string &cipherAlpha, const string &plainAlpha, const string &message) {
+    string cipherText = message;                        // cipherText same size as message
+    for (int i = 0; i < cipherAlpha.size(); i++) {      // loop over all letters in the alphabet
+        for (int j = 0; j < message.size(); j++) {      // loop over all letters in the message
+            if (plainAlpha[i] == message[j])
+                cipherText[j] = cipherAlpha[i];         // replace each plainAlpha letter in the message with the cipherAlpha letter
+        }
+    }
+    return cipherText;
+}
+
+string decrypt(const string &cipherText, const string &plainAlpha, int &key) {
+    string plainText = cipherText;                                  // plainText same size as cipherText
+    string cipherAlphabet = cipherAlpha(key, plainAlpha);       // generate cipherAlphabet
+    for (int i = 0; i < cipherAlphabet.size(); i++) {               // loop over all letters in alphabet
+        for (int j = 0; j < cipherText.size(); j++) {               // loop over all letters in the cipherText
+            if (cipherAlphabet[i] == cipherText[j])
+                plainText[j] = plainAlpha[i];                       // replace each cipherAlpha letter in the message with the plainAlpha letter
+        }
+    }
+    return plainText;
+}
diff --git a/ceasar-cipher.h b/ceasar-cipher.h
@@ -0,0 +1,17 @@
+//
+// Created by caleb on 5/5/2021.
+//
+
+#ifndef CEASAR_CIPHER_CEASAR_CIPHER_H
+#define CEASAR_CIPHER_CEASAR_CIPHER_H
+
+#endif //CEASAR_CIPHER_CEASAR_CIPHER_H
+
+#include <iostream>
+using namespace std;
+
+void encryption(const string&, char&);                                  // encryption option
+void decryption(const string&, char&);                                  // decryption option
+string cipherAlpha(int&, const string&);                                // generate cipher alphabet
+string cipherMessage(const string&, const string&, const string&);      // encrypt the message
+string decrypt(const string&, const string&, int&);                     // decrypt the message
diff --git a/main.cpp b/main.cpp
@@ -1,12 +1,7 @@
 #include <iostream>
+#include "ceasar-cipher.h"
 using namespace std;
 
-void encryption(const string&, char&);                                  // encryption option
-void decryption(const string&, char&);                                  // decryption option
-string cipherAlpha(int&, const string&);                                // generate cipher alphabet
-string cipherMessage(const string&, const string&, const string&);      // encrypt the message
-string decrypt(const string&, const string&, int&);                     // decrypt the message
-
 int main() {
     cout << "\nWelcome to Julius Ceasar's Shift Cipher!"
             "\nEnter an integer to shift the normal alphabet left by that number of positions." << endl;
@@ -35,92 +30,3 @@ int main() {
     }
     return 0;
 }
-void encryption(const string &plainAlpha, char &discard) {
-    int key;
-    string message, cipherAlphabet, cipherText;
-
-    // input number of places to shift left
-    cout << "Enter your chosen cipher key. (integer, 1-25): ";
-    cin >> key;
-    // input validation
-    if (key > 25 || key < 1) {
-        while (key > 25 || key < 1) {
-            cout << "Error! Enter an integer between 1 and 25: ";
-            cin >> key;
-        }
-    }
-    cin.get(discard);                                                   // discard \n
-    cout << "Enter the message to encrypt. (lowercase, roman alpha): ";     // input message to encrypt
-    getline(cin, message);
-
-    // shift alphabet [key] letters to the left
-    cipherAlphabet = cipherAlpha(key, plainAlpha);
-    // encrypt the message using the cipher alphabet
-    cipherText = cipherMessage(cipherAlphabet, plainAlpha, message);
-
-    cout << "\nPlaintext: " << message << endl;
-    cout << "Plain alphabet:  " << plainAlpha << "." << endl;
-    cout << "Cipher alphabet: " << cipherAlphabet << "; Shifted [" << key << "] place(s) to the left." << endl;
-    cout << "Ciphertext: " << cipherText << endl << endl;
-}
-
-void decryption(const string &plainAlpha, char &discard) {
-    int key;
-    string cipherText;
-
-    cout << "Enter the known cipher key. (integer, 1-25): ";
-    cin >> key;
-    // input validation
-    if (key > 25 || key < 1) {
-        while (key > 25 || key < 1) {
-            cout << "Error! Enter an integer between 1 and 25: ";
-            cin >> key;
-        }
-    }
-    cin.get(discard);                                                   // discard \n
-    cout << "Enter the message to decrypt. (lowercase, roman alpha): ";     // input message to decrypt
-    getline(cin, cipherText);
-
-    cout << "\nCiphertext: " << cipherText << endl;
-    cout << "Plain alphabet:  " << plainAlpha << "." << endl;
-    cout << "Cipher alphabet: " << cipherAlpha(key, plainAlpha) << "; Shifted [" << key << "] place(s) to the left." << endl;
-    // display decrypted message
-    cout << "Plaintext: " << decrypt(cipherText, plainAlpha, key) << endl << endl;
-}
-
-string cipherAlpha(int &key, const string &plainAlpha) {
-    string cipherAlpha = plainAlpha;                // cypherAlpha same size as plainAlpha
-    int p = 0;                                      // wrap around variable
-    for (int i = 0; i < plainAlpha.size(); i++) {
-        if (i + key >= plainAlpha.size()) {         // wrap around when i + key >= 26
-            cipherAlpha[i] = plainAlpha[p];         // shift cipherAlpha
-            p++;
-        } else {
-            cipherAlpha[i] = plainAlpha[i + key];   // shift cipherAlpha
-        }
-    }
-    return cipherAlpha;
-}
-
-string cipherMessage(const string &cipherAlpha, const string &plainAlpha, const string &message) {
-    string cipherText = message;                        // cipherText same size as message
-    for (int i = 0; i < cipherAlpha.size(); i++) {      // loop over all letters in the alphabet
-        for (int j = 0; j < message.size(); j++) {      // loop over all letters in the message
-            if (plainAlpha[i] == message[j])
-                cipherText[j] = cipherAlpha[i];         // replace each plainAlpha letter in the message with the cipherAlpha letter
-        }
-    }
-    return cipherText;
-}
-
-string decrypt(const string &cipherText, const string &plainAlpha, int &key) {
-    string plainText = cipherText;                                  // plainText same size as cipherText
-    string cipherAlphabet = cipherAlpha(key, plainAlpha);       // generate cipherAlphabet
-    for (int i = 0; i < cipherAlphabet.size(); i++) {               // loop over all letters in alphabet
-        for (int j = 0; j < cipherText.size(); j++) {               // loop over all letters in the cipherText
-            if (cipherAlphabet[i] == cipherText[j])
-                plainText[j] = plainAlpha[i];                       // replace each cipherAlpha letter in the message with the plainAlpha letter
-        }
-    }
-    return plainText;
-}