private void btnGenerateRandomKeys_Click(object sender, EventArgs e)
{
//reset all values
ee = 0;
d = 0;
phi = 0;
n = 0;
q = 0;
p = 0;
//generate random keys
//1- build p and q
do
{
p = DecryptionAndEncryptionServices.GetRandomPrimeNumber();
q = DecryptionAndEncryptionServices.GetRandomPrimeNumber();
} while (p == q);
//2- build n and build phi
n = p * q;
//3- build phi
phi = (p - 1) * (q - 1);
//4- build e
do
{
ee = DecryptionAndEncryptionServices.RandomIntegerBelowBigger(1, phi);
} while (DecryptionAndEncryptionServices.GCD(ee, phi) != 1);
//5- build d
d = DecryptionAndEncryptionServices.modInverse(ee, phi);
//put all results
TextBoxKeyE.Text = ee.ToString();
TextBoxKeyN.Text = n.ToString();
TextBoxKeyD.Text = d.ToString();
}
private void btnEncrypte_Click(object sender, EventArgs e)
{
//reset result of encryption for each new encryption
if (TextBoxKeyResult.Text != string.Empty)
{
TextBoxKeyResult.Text = string.Empty;
}
//before doing Encrypte we have to :
//1- make sure Message is not empty
//2- the key e and the key n and d are not empty
if (TextBoxMessage.Text == string.Empty)
{
MessageBox.Show("Please Provide the Message first!", "Missing Info!", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
else if ((TextBoxKeyE.Text == string.Empty || TextBoxKeyE.Text == "0") || (TextBoxKeyN.Text == "0" || TextBoxKeyN.Text == string.Empty) || (TextBoxKeyD.Text == "0" || TextBoxKeyD.Text == string.Empty))
{
MessageBox.Show("Please Provide The Key N and The Key E with D or Generate Randomly to Encrypte", "Missing Info!", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
//else if e and n and message is provided we will encrypte the message and show the result if they are vaild
else
{
ee = BigInteger.Parse(TextBoxKeyE.Text);
d = BigInteger.Parse(TextBoxKeyD.Text);
n = BigInteger.Parse(TextBoxKeyN.Text);
//1- TEXT THE MESSAGE DIVIDED INTO BLOCKS
richTextBox1.Text = string.Empty;
List <string> DivdedUserTextSeven = TextOperationServices.SplitInParts(TextBoxMessage.Text, 7).ToList();
List <byte[]> bytesOfEachWord = TextOperationServices.GetASCIICode(DivdedUserTextSeven);
List <List <int> > BinaryNumbers = TextOperationServices.GetListOfBinary(bytesOfEachWord);
List <List <string> > FullBinaryNumber = TextOperationServices.GetListOfFullBinary(BinaryNumbers);
List <string> FullMergedBinaryNumbers = TextOperationServices.GetFullBinaryNumberMerged(FullBinaryNumber);
List <BigInteger> FullDecimalOpenText = TextOperationServices.GetFullTextNumber(FullMergedBinaryNumbers);
//showing the full representation of open text in numeric form
for (int i = 0; i < FullDecimalOpenText.Count; i++)
{
//to avoid confustion of many spaces
if (i == FullDecimalOpenText.Count)
{
richTextBox1.Text = richTextBox1.Text + FullDecimalOpenText[i].ToString();
}
else if (i == 0)
{
richTextBox1.Text = richTextBox1.Text + FullDecimalOpenText[i].ToString();
}
else
{
richTextBox1.Text = richTextBox1.Text + " " + FullDecimalOpenText[i].ToString();
}
}
//build the cipher blocks
List <BigInteger> CipherBlocks = DecryptionAndEncryptionServices.GetCipherListText(FullDecimalOpenText, ee, n);
//showing the full representation of Cipher Text
for (int i = 0; i < CipherBlocks.Count; i++)
{
//to avoid confustion of many spaces
if (i == CipherBlocks.Count)
{
TextBoxKeyResult.Text = TextBoxKeyResult.Text + CipherBlocks[i].ToString();
}
else if (i == 0)
{
TextBoxKeyResult.Text = TextBoxKeyResult.Text + CipherBlocks[i].ToString();
}
else
{
TextBoxKeyResult.Text = TextBoxKeyResult.Text + " " + CipherBlocks[i].ToString();
}
}
}
}
private void btnDecrypte_Click(object sender, EventArgs e)
{
//making sure message is availbe
//the message should be numbers
//the 3 keys should be provided
if (TextBoxMessageToDecrypte.Text == string.Empty)
{
MessageBox.Show("Please Provide the Numeric Cipher Message to be Decrypted", "Missing Info!", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
else
{
//ELSE if text provided we will check if it is only numbers or not
if (TextBoxMessageToDecrypte.Text.Any(Char.IsLetter))
{
MessageBox.Show("To Decrypte A message you need to provide the Numeric Cipher Numbers!", "Wrong Input!!", MessageBoxButtons.OK, MessageBoxIcon.Warning);
}
//else if text is only numbers
// we will have string
//this string will accept only letters
//when it reaches space it will be added to list
//and repedately:) until length of the message
else
{
if ((TextBoxKeyE.Text == "0" || TextBoxKeyE.Text == string.Empty) || (TextBoxKeyN.Text == "0" || TextBoxKeyN.Text == string.Empty) || (TextBoxKeyN.Text == "0" || TextBoxKeyN.Text == string.Empty))
{
MessageBox.Show("Provide the Key e and n with d to build d or generate Random Keys!!", "Missing Info", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
//RESEt when user want another decryption
CurrentUserCipherWord = string.Empty;
CipherToDecrypted = new List <BigInteger>();
TextBoxDecryptedText.Text = string.Empty;
richTextBox3.Text = string.Empty;
//then assign E to text and n to text and build d
//then do decryption process
ee = BigInteger.Parse(TextBoxKeyE.Text);
n = BigInteger.Parse(TextBoxKeyN.Text);
d = BigInteger.Parse(TextBoxKeyD.Text);
try
{
for (int i = 0; i < TextBoxMessageToDecrypte.Text.Length; i++)
{
if (!char.IsWhiteSpace(TextBoxMessageToDecrypte.Text[i]))
{
CurrentUserCipherWord = CurrentUserCipherWord + TextBoxMessageToDecrypte.Text[i];
}
else if (char.IsWhiteSpace(TextBoxMessageToDecrypte.Text[i]) && CurrentUserCipherWord != " " && i != TextBoxMessageToDecrypte.TextLength)
{
CipherToDecrypted.Add(BigInteger.Parse(CurrentUserCipherWord));
CurrentUserCipherWord = string.Empty;
}
}
//to add last element if it is not space
CipherToDecrypted.Add(BigInteger.Parse(CurrentUserCipherWord));
}
catch (System.FormatException w)
{
MessageBox.Show("Please Provide the Start of Cipher without space and end of cipher without space", "Wrong Input", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
//decrypte :)
List <BigInteger> OTDecryptedBlocks = DecryptionAndEncryptionServices.GetOTDecrypted(CipherToDecrypted, d, n);
//show result
for (int i = 0; i < OTDecryptedBlocks.Count; i++)
{
TextBoxDecryptedText.Text = TextBoxDecryptedText.Text + " " + OTDecryptedBlocks[i];
}
//show result back to text form
List <string> FullBinaryMergedN = DecryptionAndEncryptionServices.GetFullMergedBinaryNumber(OTDecryptedBlocks);
List <List <string> > FullBinary7Blocks = DecryptionAndEncryptionServices.GetBinaryOfEachFullBinaryBlock(FullBinaryMergedN);
List <List <byte> > FullAsciiCode = DecryptionAndEncryptionServices.GetASCIIlaterFromBin(FullBinary7Blocks);
string finalList = DecryptionAndEncryptionServices.GetWordFromASCII(FullAsciiCode);
richTextBox3.Text = finalList;
}
}
}
