From e48a9ad4f223e83bba24d3ad92ee9a25b459f92d Mon Sep 17 00:00:00 2001
From: straiffix <straiffix@gmail.com>
Date: Sat, 14 Apr 2018 01:39:08 +0200
Subject: [PATCH 1/2] Add files via upload

---
 ciphers/Vigenere.java | 63 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 ciphers/Vigenere.java

diff --git a/ciphers/Vigenere.java b/ciphers/Vigenere.java
new file mode 100644
index 000000000..c155187d1
--- /dev/null
+++ b/ciphers/Vigenere.java
@@ -0,0 +1,63 @@
+package ciphers;
+
+/**
+ * A Java implementation of Vigenere Cipher.
+ * @author  straiffix
+ */
+
+
+public class Vigenere  {
+
+    public  static String encrypt(final String message, final String key)
+    {
+
+        String result = "";
+
+        for (int i = 0, j = 0; i < message.length(); i++)
+        {
+            char c = message.charAt(i);
+            if (c >= 'A' && c <= 'Z') {
+                result += (char) ((c + key.toUpperCase().charAt(j) - 2 * 'A') % 26 + 'A');
+                j = ++j % key.length();
+            } else if (c >= 'a' && c <= 'z') {
+                result += (char) ((c + key.toLowerCase().charAt(j) - 2 * 'a') % 26 + 'a');
+                j = ++j % key.length();
+            } else {
+                result+=c;
+                continue;
+            }
+        }
+        return result;
+    }
+
+    public static String decrypt( final String message, final String key)
+    {
+        String result ="";
+
+        for(int i = 0, j = 0; i < message.length(); i++){
+
+            char c = message.charAt(i);
+            if((c >= 'A' && c <= 'Z')){
+                result += ((char)('Z'-(25-(c-key.toUpperCase().charAt(j)))%26));
+            }
+            else if(c >= 'a' && c <= 'z'){
+                result += ((char)('z'-(25-(c-key.toLowerCase().charAt(j)))%26));
+            }
+            else{
+                result+=c;
+                continue;
+            }
+            j = ++j % key.length();
+        }
+        return result;
+    }
+    public static void main (String [] args){
+        String text="Hello World!";
+        String key="itsakey";
+        System.out.println(text);
+        String ciphertext=encrypt(text, key);
+        System.out.println(ciphertext);
+        System.out.println(decrypt(ciphertext, key));
+
+    }
+}
\ No newline at end of file

From e53ec5303476c304aa87388880155181bfa44026 Mon Sep 17 00:00:00 2001
From: Fractum <24612656+straiffix@users.noreply.github.com>
Date: Sun, 15 Apr 2018 10:45:31 +0200
Subject: [PATCH 2/2] Update Vigenere.java

- Remove continue;
- Change condition with Character.isLetter() and Character.isUpperCase();
---
 ciphers/Vigenere.java | 46 +++++++++++++++++++++++--------------------
 1 file changed, 25 insertions(+), 21 deletions(-)

diff --git a/ciphers/Vigenere.java b/ciphers/Vigenere.java
index c155187d1..48c54288d 100644
--- a/ciphers/Vigenere.java
+++ b/ciphers/Vigenere.java
@@ -8,49 +8,53 @@ package ciphers;
 
 public class Vigenere  {
 
-    public  static String encrypt(final String message, final String key)
+     public static String encrypt(final String message, final String key)
     {
 
         String result = "";
 
-        for (int i = 0, j = 0; i < message.length(); i++)
-        {
+        for (int i = 0, j = 0; i < message.length(); i++) {
             char c = message.charAt(i);
-            if (c >= 'A' && c <= 'Z') {
-                result += (char) ((c + key.toUpperCase().charAt(j) - 2 * 'A') % 26 + 'A');
-                j = ++j % key.length();
-            } else if (c >= 'a' && c <= 'z') {
-                result += (char) ((c + key.toLowerCase().charAt(j) - 2 * 'a') % 26 + 'a');
-                j = ++j % key.length();
+            if (Character.isLetter(c)){
+                if(Character.isUpperCase(c)) {
+                    result += (char) ((c + key.toUpperCase().charAt(j) - 2 * 'A') % 26 + 'A');
+
+                } else {
+                    result += (char) ((c + key.toLowerCase().charAt(j) - 2 * 'a') % 26 + 'a');
+
+                }
             } else {
                 result+=c;
-                continue;
             }
+            j = ++j % key.length();
         }
         return result;
     }
 
-    public static String decrypt( final String message, final String key)
+     public static String decrypt( final String message, final String key)
     {
         String result ="";
 
         for(int i = 0, j = 0; i < message.length(); i++){
 
             char c = message.charAt(i);
-            if((c >= 'A' && c <= 'Z')){
-                result += ((char)('Z'-(25-(c-key.toUpperCase().charAt(j)))%26));
-            }
-            else if(c >= 'a' && c <= 'z'){
-                result += ((char)('z'-(25-(c-key.toLowerCase().charAt(j)))%26));
-            }
-            else{
+            if (Character.isLetter(c)){
+                if(Character.isUpperCase(c)) {
+                    result += ((char)('Z'-(25-(c-key.toUpperCase().charAt(j)))%26));
+
+                } else {
+                    result += ((char)('z'-(25-(c-key.toLowerCase().charAt(j)))%26));
+
+                }
+            } else {
                 result+=c;
-                continue;
             }
+
             j = ++j % key.length();
+
         }
         return result;
-    }
+     }
     public static void main (String [] args){
         String text="Hello World!";
         String key="itsakey";
@@ -60,4 +64,4 @@ public class Vigenere  {
         System.out.println(decrypt(ciphertext, key));
 
     }
-}
\ No newline at end of file
+}