/**A coding challenge on Sololearn. Encryption/Decryption Task Place letters of a message on the corners of a cube in a procedural way. The cubes would be randomly rotated a random number of times in a random direction and the corners of the cubes recorded to represent an encrypted message. The rotations were recorded as an encrypt key and a decrypt key was made from that. The Cubes were then rotated using the decrypt key. All was presented in an ASCII friendly way.. This was alot of fun!!! **/ using System; using System.Collections.Generic; using System.Text.RegularExpressions; namespace SoloLearn { class CharCube{ private string StrSeg {get;set;} private int StrLength {get;set;} private char[][][] CharVerts {get; set;} private string[] cubeVis= {" {0}----------{1}", " /| /|", " / | / |", " / | / |", " {0}----------{1} |", " | | | |", " | {0}------|---{1}", " | / | / ", " | / | / ", " |/ |/ ", " {0}----------{1} "}; public CharCube(string strSeg){ StrSeg = strSeg; StrLength = StrSeg.Length; CharVerts = Initialize3dCharArray(); int i = 0; for(int x = 0; x < 2; x++){ for(int y = 0; y < 2; y++){ for(int z = 0; z < 2; z++){ if(i >= StrLength) {break;} CharVerts[x][y][z]=StrSeg[i]; i++; } } } } public string[] cubeDisplay(){ //Initializing an array with String formats and turnary operatiors to account for 'null' characters string[] displayArray = new string[]{ string.Format(cubeVis[0], ((CharVerts[1][0][1]=='\0')?' ':CharVerts[1][0][1]), ((CharVerts[1][1][0])=='\0')?' ':CharVerts[1][1][0]), cubeVis[1], cubeVis[2], cubeVis[3], string.Format(cubeVis[4], ((CharVerts[0][0][1]=='\0')?' ':CharVerts[0][0][1]), ((CharVerts[0][1][0])=='\0')?' ':CharVerts[0][1][0]), cubeVis[5], string.Format(cubeVis[6], ((CharVerts[1][0][0]=='\0')?' ':CharVerts[1][0][0]), ((CharVerts[1][1][1])=='\0')?' ':CharVerts[1][1][1]), cubeVis[7], cubeVis[8], cubeVis[9], string.Format(cubeVis[10], ((CharVerts[0][0][0]=='\0')?' ':CharVerts[0][0][0]), ((CharVerts[0][1][1])=='\0')?' ':CharVerts[0][1][1])}; //called by CubeDisplays of the CubeList class return displayArray; } public string readFromCube(){ //iterates through the current rotation of the cube and pulls the characters in order. string cubeRead = ""; for(int x = 0; x < 2; x++) for(int y = 0; y < 2; y++) for(int z = 0; z < 2; z++) cubeRead+=CharVerts[x][y][z]; return cubeRead; } public void rotateCube(char direction){ //make a copy of the original array to char[][][] copiedArray = CopyCharVerts(CharVerts); //Depending on rotation the characters of string are sent to specific vertices //This is some Matricies Math type stuff switch (direction){ case 'R': CharVerts[0][0][0] = copiedArray[1][0][0]; CharVerts[0][0][1] = copiedArray[1][0][1]; CharVerts[0][1][0] = copiedArray[0][0][1]; CharVerts[0][1][1] = copiedArray[0][0][0]; CharVerts[1][0][0] = copiedArray[1][1][1]; CharVerts[1][0][1] = copiedArray[1][1][0]; CharVerts[1][1][0] = copiedArray[0][1][0]; CharVerts[1][1][1] = copiedArray[0][1][1]; break; case 'L': CharVerts[0][0][0] = copiedArray[0][1][1]; CharVerts[0][0][1] = copiedArray[0][1][0]; CharVerts[0][1][0] = copiedArray[1][1][0]; CharVerts[0][1][1] = copiedArray[1][1][1]; CharVerts[1][0][0] = copiedArray[0][0][0]; CharVerts[1][0][1] = copiedArray[0][0][1]; CharVerts[1][1][0] = copiedArray[1][0][1]; CharVerts[1][1][1] = copiedArray[1][0][0]; break; case 'U': CharVerts[0][0][0] = copiedArray[1][0][0]; CharVerts[0][0][1] = copiedArray[0][0][0]; CharVerts[0][1][0] = copiedArray[0][1][1]; CharVerts[0][1][1] = copiedArray[1][1][1]; CharVerts[1][0][0] = copiedArray[1][0][1]; CharVerts[1][0][1] = copiedArray[0][0][1]; CharVerts[1][1][0] = copiedArray[0][1][0]; CharVerts[1][1][1] = copiedArray[1][1][0]; break; case 'D': CharVerts[0][0][0] = copiedArray[0][0][1]; CharVerts[0][0][1] = copiedArray[1][0][1]; CharVerts[0][1][0] = copiedArray[1][1][0]; CharVerts[0][1][1] = copiedArray[0][1][0]; CharVerts[1][0][0] = copiedArray[0][0][0]; CharVerts[1][0][1] = copiedArray[1][0][0]; CharVerts[1][1][0] = copiedArray[1][1][1]; CharVerts[1][1][1] = copiedArray[0][1][1]; break; default: break; } //readFromCube after rotation to change this StrSeg StrSeg = this.readFromCube(); } static char[][][] CopyCharVerts(char[][][] source){ //create a copy and not a reference of the jagged array char[][][] copiedArray = Initialize3dCharArray(); for(int x = 0; x < 2; x++) for(int y = 0; y < 2; y++) Array.Copy(source[x][y],copiedArray[x][y],copiedArray[x][y].Length); return copiedArray; } static char[][][] Initialize3dCharArray(){ //I used this a few times, so felt it warranted an method to ease up the code char[][][] charArray3D =new char[][][]{ new char[][]{new char[]{'\0','\0'},new char[]{'\0','\0'}}, new char[][]{new char[]{'\0','\0'},new char[]{'\0','\0'}}}; return charArray3D; } } class CubeList{ private List cubeList = new List(); private string InputString{get;set;} private string EncryptKey {get; set;} private string DecryptKey {get; set;} public CubeList(string input){ InputString = input; int numCubes; numCubes = (int)Math.Ceiling((double)InputString.Length/8.0); for(int i = 0; i < numCubes;i++){ //Add the string of the cube to the end if the class' InputString this.AddCube(new CharCube(InputString.Substring(i*8,InputString.Length-(i*8)))); } } public void AddCube(CharCube newCube){ cubeList.Add(newCube); } public CharCube GetCube(int index){ return cubeList[index]; } public bool IsValidFormat(string ek){ /*Validates that the Encrypt String is following the format suggested Originally I was going to allow users to write thier own encryption string but ran out of time Learned how to validate with Regex, but ran out of time. */ int nil; bool valid = false; int ekL = ek.Length; //character at index, character before index, and character after index char ci, cb, ca; //If the first character of the string does not parse to a number, return false if ( !Int32.TryParse(Char.ToString(ek[0]),out nil)){ return false;} /*Iterate each character of the string check whether its a valid letter, there is a number after each comma, ':' always preceds a direction or the current index is a 0-9 character */ for (int i = 0; i < ekL; i++){ ci = ek[i]; cb = ek[(i- 1< 0 )? i:(i-1)]; ca = ek[(i+1 == ekL)? i:(1+i)]; if ((ek[i] == 'U' && cb ==':')|| (ek[i] == 'D' && cb ==':')|| (ek[i] == 'L' && cb ==':')|| (ek[i] == 'R' && cb ==':')|| (ek[i] == ':' )|| (ek[i] == ',' && Int32.TryParse(Convert.ToString(ca),out nil))|| Int32.TryParse(Convert.ToString(ci),out nil)){ valid = true; } else{ valid = false; break; } } return valid; } public void RotateCubes(string encryptKey){ string cubeSelect = ""; int cubeNum = 0; int listSize = cubeList.Count; encryptKey = encryptKey.ToUpper(); //Check if key is valid before interpereting Key to rotate cubes if(!IsValidFormat(EncryptKey)){ Console.WriteLine("Invalid key format, Message not encrypted."); return; } /*loop through each character of the string Process : and ; first because they are the most frequent to help speed things along Process directions after validating that there is a cube in the list of that number Assuming it would not time out, the number of cunes can be more than 1 digit */ for(int i = 0; i < encryptKey.Length; i++){ switch (encryptKey[i]) { case ':': case ',': break; // if a valid character rotate the specific cube. case 'R': if (cubeNum >= listSize) break; else{this.GetCube(cubeNum).rotateCube(encryptKey[i]); cubeSelect = ""; break;} case 'L': if (cubeNum >= listSize) break; else{this.GetCube(cubeNum).rotateCube(encryptKey[i]); cubeSelect = ""; break;} case 'U': if (cubeNum >= listSize) break; else{this.GetCube(cubeNum).rotateCube(encryptKey[i]); cubeSelect = ""; break;} case 'D': if (cubeNum >= listSize) break; else{this.GetCube(cubeNum).rotateCube(encryptKey[i]); cubeSelect = ""; break;} /* if a number, save number in a variable for cubeSelect // if the next number on its iteration is still a number, add it to the one before, then parse that string to int*/ case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9': //This approach is for the possibility of 10 or more cubes cubeSelect += encryptKey[i]; cubeNum = Int32.Parse(cubeSelect); break; } } } public void RotateCubes(){ /* This method is messy, it randomly rotates the cube, and builds the encrypt and decrypt key If I get the Regex working properly in the Decrypt Method, then this will get cleaner. */ char[] dirArray = {'R','L','U','D'}; string encryptKeySeg = ""; Random rnd = new Random(); string stringNum = ""; int currIndex; for(int i = 0; i < cubeList.Count; i++){ stringNum = Convert.ToString(i); EncryptKey += (i==0) ? stringNum : (","+stringNum); DecryptKey += (i==0) ? stringNum : (","+stringNum); for (int j = 0; j < rnd.Next(3,5) ;j++){ currIndex = rnd.Next(0,4); this.GetCube(i).rotateCube(dirArray[currIndex]); encryptKeySeg += dirArray[currIndex]; EncryptKey += ":"+dirArray[currIndex]; } for (int k = 0; k < encryptKeySeg.Length; k++){ if(EncryptKey[EncryptKey.Length-(k*2)-1]=='L') DecryptKey += ":"+ "R"; if(EncryptKey[EncryptKey.Length-(k*2)-1]=='R') DecryptKey += ":"+ "L"; if(EncryptKey[EncryptKey.Length-(k*2)-1]=='U') DecryptKey += ":"+ "D"; if(EncryptKey[EncryptKey.Length-(k*2)-1]=='D') DecryptKey += ":"+ "U"; } encryptKeySeg = ""; } Console.WriteLine(EncryptKey); } public void DisplayString(){ foreach(CharCube cube in cubeList){ Console.Write(cube.readFromCube()); } Console.WriteLine(""); } public void DisplayCubes(){ /*While making a cube visualization, store an accumulated string of that line into cubeDisplays*/ string[] cubeDisplays = {"","","","","","","","","","",""}; for (int i = 0; i < cubeList.Count;i++){ string[] tempArrays = this.GetCube(i).cubeDisplay(); for(int j = 0; j < cubeDisplays.Length; j++){ cubeDisplays[j] += tempArrays[j]; } } //write the cubeDisplays for (int k = 0; k < cubeDisplays.Length; k++){ Console.WriteLine(cubeDisplays[k]); } } public string Decrypt(){ return DecryptKey; //Be able to decrypt a custom or random key like: //0:L:L:D,1:L:L:R:U,2:L:L:U:D,3:L:L:L:L,4:L:D:R:D,5:L:L:R /** DecryptKey = ""; int nil; int lastNumIndex; for(int i = 0; i < EncryptKey.Length;i++){ string eKi = EncryptKey.Substring(i,1); if ( Int32.TryParse(eKi,out nil)){ lastNumIndex = i; DecryptKey += eKi; } if (eKi == ":"){ DecryptKey.Insert(i,EncryptKey.Substring(lastNumIndex+1,2)); } if (eKi == ",") DecryptKey += eKi; } //get first number in a string[] //get numbers after a comma in a string[] **/ } } class Program { static void Main(string[] args) { CubeList cubes; cubes = new CubeList("My brain is as scrambled as these letters!"); cubes.DisplayCubes(); cubes.DisplayString(); cubes.RotateCubes(); cubes.DisplayCubes(); cubes.DisplayString(); cubes.RotateCubes(cubes.Decrypt()); cubes.DisplayCubes(); cubes.DisplayString(); } } }

CodeCube