cypher done

Crypto/Crypto.iml

@@ -7,12 +7,13 @@
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
-    <orderEntry type="library" name="Arquillian JUnit:Release" level="project" />
     <orderEntry type="module-library">
-      <library name="JUnit4">
+      <library name="JUnit5.0">
         <CLASSES>
-          <root url="jar://$APPLICATION_HOME_DIR$/lib/junit-4.12.jar!/" />
-          <root url="jar://$APPLICATION_HOME_DIR$/lib/hamcrest-core-1.3.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/junit/jupiter/junit-jupiter-api/5.0.0/junit-jupiter-api-5.0.0.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/apiguardian/apiguardian-api/1.0.0/apiguardian-api-1.0.0.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/opentest4j/opentest4j/1.0.0/opentest4j-1.0.0.jar!/" />
+          <root url="jar://$MAVEN_REPOSITORY$/org/junit/platform/junit-platform-commons/1.0.0/junit-platform-commons-1.0.0.jar!/" />
         </CLASSES>
         <JAVADOC />
         <SOURCES />

Crypto/src/ROT13.java

@@ -1,32 +1,66 @@
 import static java.lang.Character.isLowerCase;
 import static java.lang.Character.isUpperCase;
 import static java.lang.Character.toLowerCase;
+import java.util.*;
+import java.util.stream.*;
 
 public class ROT13  {
+    int shift;
+    Map<Character, Character> cypher;
+    String alphabet = "abcdefghijklmnopqrstuvwxyz";
 
     ROT13(Character cs, Character cf) {
+        shift = Math.abs((int)cs - (int)cf);
+        setupHM();
     }
 
     ROT13() {
+        shift = 13;
+        setupHM();
+    }
+
+    public void setupHM() {
+        cypher = new HashMap<>();
+        for(Character c : alphabet.toCharArray()) {
+            int offset = (int)c + shift > 122 ? (int)c - shift : (int)c  + shift;
+            cypher.put(c, (char)offset);
+        }
     }
 
 
     public String crypt(String text) throws UnsupportedOperationException {
+        StringBuilder result = new StringBuilder();
 
-        return "";
+        for(Character c : text.toCharArray()) {
+            if (Character.isLetter(c)) {
+                if (Character.isUpperCase(c)) {
+                    result.append(Character.toUpperCase(cypher.get(Character.toLowerCase(c))));
+                }
+                else result.append(cypher.get(c));
+            }
+            else {
+                result.append(c);
+            }
+        }
+        return result.toString();
     }
 
     public String encrypt(String text) {
-        return text;
+        return crypt(text);
     }
 
     public String decrypt(String text) {
-        return text;
+        return crypt(text);
     }
 
     public static String rotate(String s, Character c) {
+        String[] rotator = s.split("");
+        StringBuilder result = new StringBuilder();
 
-        return "";
+        for(int i = 0; i < rotator.length; i++) {
+            result.append(rotator[(s.indexOf(c) + i) % rotator.length]);
+        }
+        return result.toString();
     }
 
 }

Crypto/src/ROT13Test.java

@@ -1,6 +1,5 @@
-import org.junit.Test;
-
-import static org.junit.Assert.*;
+import static org.junit.jupiter.api.Assertions.*;
+import org.junit.jupiter.api.Test;
 
 public class ROT13Test {
 

SimpleCrypt.iml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_5">
+    <output url="file://$MODULE_DIR$/target/classes" />
+    <output-test url="file://$MODULE_DIR$/target/test-classes" />
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

pom.xml

@@ -8,5 +8,14 @@
     <artifactId>SimpleCrypt</artifactId>
     <version>1.0-SNAPSHOT</version>
 
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.8.1</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
 
 </project>