init

ciphers/Cipher.java

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+import java.util.*;
+import java.io.*;
+
+// Represents a classical cipher that is able to encode a plaintext into a ciphertext, and
+// decode a ciphertext into a plaintext. Also capable of encoding and decoding entire files
+
+public abstract class Cipher {
+    // The minimum character able to be encoded by any cipher
+    public static final int MIN_CHAR = (int)(' ');
+    
+    // The maximum character able to be encoded by any cipher
+    public static final int MAX_CHAR = (int)('}');
+    
+    // The total number of characters able to be encoded by any cipher (aka. the encodable range)
+    public static final int TOTAL_CHARS = MAX_CHAR - MIN_CHAR + 1;
+
+    // Pre: Throws a FileNotFoundException if a file with the provided 'fileName' doesn't exist
+    // Post: Applies this Cipher's encryption scheme to the file with the given 'fileName', creating
+    //       a new file to store the results.
+    public void encryptFile(String fileName) throws FileNotFoundException {
+        fileHelper(fileName, true, "-encoded");
+    }
+    
+    // Pre: Throws a FileNotFoundException if a file with the provided 'fileName' doesn't exist
+    // Post: Applies this Cipher's decryption scheme (reversing a single round of encryption if applied)
+    //       to the file with the given 'fileName', creating a new file to store the results.
+    public void decryptFile(String fileName) throws FileNotFoundException {
+        fileHelper(fileName, false, "-decoded");
+    }
+    
+    // Pre: Throws a FileNotFoundException if a file with the provided 'fileName' doesn't exist
+    // Post: Reads from an input file with 'fileName', either encrypting or decrypting depending on 'encode',
+    //       printing the results to a new file with 'suffix' appended to the input file's name
+    private void fileHelper(String fileName, boolean encode, String suffix) throws FileNotFoundException{
+        Scanner sc = new Scanner(new File(fileName));
+        String out = fileName.split("\\.txt")[0] + suffix + ".txt";
+        PrintStream ps = new PrintStream(out);
+        while(sc.hasNextLine()) {
+            String line = sc.nextLine();
+            ps.println(encode ? encrypt(line) : decrypt(line));
+        }
+    }
+
+    // Post: Returns the result of applying this Cipher's encryption scheme to 'input'
+    public abstract String encrypt(String input);
+    
+    // Post: Returns the result of applying this Cipher's decryption scheme to 'input'
+    public abstract String decrypt(String input);
+}

ciphers/Client.java

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+import java.util.*;
+import java.io.*;
+
+public class Client {
+    // TODO: Change this line once you've implemented a cipher!
+    public static final Cipher CHOSEN_CIPHER = null;
+
+    // (we also encourage you to change Cipher.MIN_CHAR and Cipher.MAX_CHAR when testing!)
+    public static void main(String[] args) throws FileNotFoundException {
+        Scanner console = new Scanner(System.in);
+        System.out.println("Welcome to the CSE 123 cryptography application!");
+        System.out.println("What would you like to do?");
+        int chosen = -1;
+        do {
+            System.out.println();
+            System.out.println("(1) Encode / (2) Decode a string");
+            System.out.println("(3) Encode / (4) Decode a file");
+            System.out.println("(5) Quit");
+            System.out.print("Enter your choice here: ");
+            
+            chosen = Integer.parseInt(console.nextLine());
+            while (chosen < 1 || chosen > 5) {
+                System.out.print("Please enter a valid option from above: ");
+                chosen = Integer.parseInt(console.nextLine());
+            }
+
+            if (chosen == 1 || chosen == 2) {
+                System.out.println("Please enter the string you'd like to " +
+                                    (chosen == 1 ? "encode" : "decode") + ": ");
+                String input = console.nextLine();
+                System.out.println(chosen == 1 ? CHOSEN_CIPHER.encrypt(input) :
+                                                 CHOSEN_CIPHER.decrypt(input));
+            } else if (chosen == 3 || chosen == 4) {
+                System.out.print("Please enter the name of the file you'd like to " +
+                                    (chosen == 3 ? "encode" : "decode") + ": ");
+                String fileName = console.nextLine();
+                if (chosen == 3) {
+                    CHOSEN_CIPHER.encryptFile(fileName);
+                } else {
+                    CHOSEN_CIPHER.decryptFile(fileName);
+                }      
+            }
+        } while (chosen != 5);
+    }
+}

ciphers/SubstitutionRandom.java

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+// TODO: Write your implementation to SubstitutionRandom here!
+import java.util.*;
+
+public class SubstitutionRandom extends Substitution {
+    public static void main(String[] args) {
+        Random balls = new Random();
+        int boner = balls.nextInt(4);
+        System.out.println(boner);
+        Collections.shuffle()
+    }
+}

ciphers/Testing.java

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+import org.junit.jupiter.api.*;
+import static org.junit.jupiter.api.Assertions.*;
+import static org.junit.Assume.assumeTrue;
+import java.util.*;
+
+public class Testing {
+
+    @Test
+    @DisplayName("TODO: 1 Your Extension - ' '-'}' Shifter")
+    public void thirdCaseTest() {
+        assertTrue(false, "Not yet implemented!");
+    }
+
+    @Test
+    @DisplayName("TODO: 1 Your Extension - ' '-'}' Shifter")
+    public void thirdCaseTest() {
+        assertTrue(false, "Not yet implemented!");
+    }
+}

ciphers/Transposition.java

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+// TODO: Write your implementation to Transposition here!

ciphers/Vigenere.java

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+// TODO: Write your implementation to Vigenere here!

ciphers/files/ag.txt

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+HADBADCABBAGEBAG

ciphers/files/simple.txt

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+Hi everyone,
+
+We're using Ed Discussion for class Q&A.
+This is the best place to ask questions about the course, whether curricular or administrative. You will get faster answers here from staff and peers than through email.
+
+Here are some tips:
+Search before you post
+Heart questions and answers you find useful
+Answer questions you feel confident answering
+Share interesting course related content with staff and peers
+
+For more information on Ed Discussion, you can refer to the Quick Start Guide.
+
+All the best this semester!
+Brett