init

2020-01-29 12:56:06 +01:00
commit 04efff0d15
51 changed files with 1673 additions and 0 deletions
--- a/html/tasks/chapter_5/task12_encryption/oppgave.html
+++ b/html/tasks/chapter_5/task12_encryption/oppgave.html
@@ -0,0 +1,38 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta http-equiv="X-UA-Compatible" content="ie=edge">
+    <title>Rot n</title>
+    <link rel="stylesheet" href="../../../../resources/css/main.css">
+    <script async src="script.js"></script>
+</head>
+<body>
+    
+    <h1>Rot(n)</h1>
+
+    <h2>Encryption</h2>
+    <form id="encrypt">
+        Message<br>
+        <input type="text" name="Message" id="emess">
+         Cipher:
+        <input type="number" name="Cipher" min="0" max="26" id="enum"> 
+        <input type="submit" value="Submit">
+      </form>
+
+      <p id="etext"></p>
+
+      <h2>Decryption</h2>
+      <form id="decrypt">
+        Message<br>
+        <input type="text" name="Message" id="dmess">
+        Cipher: 
+        <input type="number" name="Cipher" min="0" max="26" id="dnum"> 
+        <input type="submit" value="Submit">
+      </form>
+
+      <p id="dtext"></p>
+
+</body>
+</html>
--- a/html/tasks/chapter_5/task12_encryption/script.js
+++ b/html/tasks/chapter_5/task12_encryption/script.js
@@ -0,0 +1,71 @@
+var encForm = document.getElementById("encrypt");
+var emess = document.getElementById("emess");
+var eciph = document.getElementById("enum");
+var etext = document.getElementById("etext");
+encForm.onsubmit=function(evt){
+    evt.preventDefault();
+    etext.innerHTML = encrypt(emess.value, parseInt(eciph.value));
+}
+
+var decForm = document.getElementById("decrypt");
+var dmess = document.getElementById("dmess");
+var dciph = document.getElementById("dnum");
+var dtext = document.getElementById("dtext");
+decForm.onsubmit=function(evt){
+    evt.preventDefault();
+    dtext.innerHTML = decrypt(dmess.value, parseInt(dciph.value));
+}
+
+function mod(x,n){
+    return ((x%n)+n)%n;
+}
+
+
+function encrypt(mess,number){
+    messArray=mess.split('');
+    result=[];
+
+    for (i in messArray){
+        x=messArray[i].charCodeAt(0);
+
+        if (x>64 && x<91){
+            x-=64;
+            x+=number;
+            x=mod(x,26);
+            x+=64;
+        } else if (x>96 && x<123){
+            x-=96;
+            x+=number;
+            x=mod(x,26);
+            x+=96;
+        }
+        result.push(String.fromCharCode(x));
+    }
+    result = result.join("");
+    return result;
+
+}
+
+function decrypt(mess,number){
+    messArray=mess.split('');
+    result=[];
+
+    for (i in messArray){
+        x=messArray[i].charCodeAt(0);
+
+        if (x>64 && x<91){
+            x-=64;
+            x-=number;
+            x=mod(x,26);
+            x+=64;
+        } else if (x>96 && x<123){
+            x-=96;
+            x-=number;
+            x=mod(x,26);
+            x+=96;
+        }
+        result.push(String.fromCharCode(x));
+    }
+    result = result.join("");
+    return result;
+}