add the transposition and double transposition encryption

Author: shams-nahid

.idea/vcs.xml

@@ -32,7 +32,7 @@ const caesarCipher = (mainString, num, cb) => {
     cb(newString);
 };
 
-caesarCipher('Zoo Keeper', 2, (result) => {
+caesarCipher('Zoo Keeper', -1, (result) => {
     console.log('Result is: ' + result);
 });
 

.idea/workspace.xml

@@ -0,0 +1,69 @@
+let transposition = (myString, column, cb) => {
+
+    createMatrix(myString, column, (err, matrix, row) => {
+        let transposedMessage = '';
+        if (err) {
+
+        } else {
+            for (let j=0; j<column; j++) {
+                for (let i=0; i<row; i++) {
+                    if (matrix[i][j] == null) {
+
+                    } else {
+                        transposedMessage += matrix[i][j];
+                    }
+                }
+            }
+
+            return cb(null, transposedMessage);
+        }
+    });
+};
+
+let createMatrix = (myString, column, cb) => {
+    myString = myString.split('');
+    let row,
+        length = myString.length,
+        tempRowF = length/column,
+        tempRowR = parseInt(length/column),
+        matrix = new Array();
+
+    if (tempRowR == tempRowF) {
+        row = tempRowR;
+    } else {
+        row = tempRowR + 1;
+    }
+
+    let index = 0;
+
+    for (let i=0; i<row; i++) {
+        matrix[i] = new Array();
+    }
+
+    for (let i=0; i<row; i++) {
+        for (let j=0; j<column; j++) {
+            if (myString[index] == ' ') {
+                matrix[i][j] = '-';
+            } else if (index >= length) {
+                matrix[i][j] = null;
+            } else {
+                matrix[i][j] = myString[index];
+            }
+            index ++;
+        }
+    }
+
+    return cb(null, matrix, row);
+};
+
+transposition('ABCDEF', 3, (err, encryptMessage) => {
+    if (err) {
+
+    } else {
+        console.log(encryptMessage);
+        transposition(encryptMessage, 3, (err, decryptMessage) => {
+            console.log(decryptMessage);
+        })
+    }
+});
+