//Encrypts based on inputed code word and phrase
static private string processString(string w, string p)
{
//Input to uppercase
string word = w.ToUpper();
string phrase = p.ToUpper();
//Input to array
char[] wordArray = word.ToCharArray();
char[] phraseArray = phrase.ToCharArray();
//Defines array length
int wordInt = wordArray.Length;
int phraseInt = phraseArray.Length;
//Initializes variables
int x = 0;
int y = 0;
string encodedPhrase = ("");
//Initializes code grid
char[][] Grid = CipherGrid.Initialize();
//Encryption starts
for (int i = 0; i < phraseInt; i++)
{
//Picks out character
char wordChar = wordArray[x];
char phraseChar = phraseArray[y];
//Sets character to numerical value (0-25)
int wordCharInt = wordChar - 65;
int phraseCharInt = phraseChar - 65;
//Finds character's ecrypted equivalent
char encode = Grid[wordCharInt][phraseCharInt];
//Adds encrypted character to output string
encodedPhrase += ($"{encode}");
//Repeats code word through phrase to encrypt
x++;
y++;
if (x == wordInt)
{
x = 0;
}
}
//Initiates 2nd encryption using code word "difficult"
string extra = ("difficult");
string encodedPhrase2 = processString2(extra, encodedPhrase);
//Returns final encrypted phrase to program
return(encodedPhrase2);
}
//2nd level decryption method (goes first)
static private string processString2(string w, string p)
{
//Initial converstions
string word = w.ToUpper();
string phrase = p.ToUpper();
char[] wordArray = word.ToCharArray();
char[] phraseArray = phrase.ToCharArray();
int wordInt = wordArray.Length;
int phraseInt = phraseArray.Length;
//Set needed variables
int x = 0;
int y = 0;
string decodedPhrase = ("");
//Initialize reverse code grid
char[][] Grid = CipherGrid.Initialize2();
//Finds encrypted character address
for (int i = 0; i < phraseInt; i++)
{
char wordChar = wordArray[x];
char phraseChar = phraseArray[y];
int wordCharInt = wordChar - 65;
int phraseCharInt = phraseChar - 65;
char decode = Grid[wordCharInt][phraseCharInt];
//Adds character to phrase
decodedPhrase += ($"{decode}");
//Repeats code word through encrypted phrase
x++;
y++;
if (x == wordInt)
{
x = 0;
}
}
//Returns encrypted phrase with program code word decrypted
return(decodedPhrase);
}
//Decrypts based on inputed code word and phrase
static private string processString(string w, string p)
{
//Calls 2nd level decryption method with program code word "difficult"
string extra = ("difficult");
string decodedPhrase2 = processString2(extra, p);
//Input to uppercase
string word = w.ToUpper();
string phrase = decodedPhrase2.ToUpper();
//Input to array
char[] wordArray = word.ToCharArray();
char[] phraseArray = phrase.ToCharArray();
//Defines array length
int wordInt = wordArray.Length;
int phraseInt = phraseArray.Length;
//Initializes variables
int x = 0;
int y = 0;
string decodedPhrase = ("");
//Initializes code grid
char[][] Grid = CipherGrid.Initialize();
//Decryption starts
for (int i = 0; i < phraseInt; i++)
{
int decodeInt;
//Picks out character
char wordChar = wordArray[x];
char phraseChar = phraseArray[y];
//Sets character to numerical value (0-25)
int wordCharInt = wordChar - 65;
int phraseCharInt = phraseChar - 65;
//Finds encrypted character's decryption address
if (wordCharInt > phraseCharInt)
{
decodeInt = (26 - wordCharInt) + phraseCharInt;
}
else if (wordCharInt <= phraseCharInt)
{
decodeInt = phraseCharInt - wordCharInt;
}
else
{
Console.WriteLine("An error occured!");
break;
}
//Add's decrypted character to output string
char decode = Grid[0][decodeInt];
decodedPhrase += ($"{decode}");
//Repeats code word through encrypted phrase
x++;
y++;
if (x == wordInt)
{
x = 0;
}
}
//Returns fully decoded phrase
return(decodedPhrase);
}
