CRYPTO_LAB

Crypto/src/ROT13.java

 import static java.lang.Character.isLowerCase;
 import static java.lang.Character.isUpperCase;
-import static java.lang.Character.toLowerCase;
+//import static java.lang.Character.toLowerCase;
 
 public class ROT13  {
+    private int shift;
 
     ROT13(Character cs, Character cf) {
+        this.shift = cf - cs;
     }
 
     ROT13() {
+        this.shift = 13;
     }
 
 
     public String crypt(String text) throws UnsupportedOperationException {
-
-        return "";
+        StringBuilder sb = new StringBuilder();
+        for(int i=0; i<text.length(); i++){
+            if(isLowerCase(text.charAt(i))){
+                sb.append((char)(((int)(text.charAt(i))+ shift - 97)%26+97));
+            }
+            else if(isUpperCase(text.charAt(i))){
+                sb.append((char)(((int)(text.charAt(i))+ shift - 65)%26+65));
+            }
+            else {
+                sb.append(text.charAt(i));
+            }
+        }
+
+        return sb.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 subStr = s.substring(0, s.indexOf(c));
+        String subStr1 = s.substring(s.indexOf(c));
+
 
-        return "";
+        return subStr1.concat(subStr);
     }
 
 }

SimpleCrypt.iml

+<?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://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/Crypto/src" isTestSource="false" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="Maven: junit:junit:4.12" level="project" />
+    <orderEntry type="library" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
+  </component>
+</module>

pom.xml

     <groupId>com.zipcodewilmington</groupId>
     <artifactId>SimpleCrypt</artifactId>
     <version>1.0-SNAPSHOT</version>
+    <dependencies>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>RELEASE</version>
+            <scope>compile</scope>
+        </dependency>
+    </dependencies>
 
 
 </project>