private void btnParse_Click(object sender, EventArgs e)
{
if (this.bmp == null)
{
MessageBox.Show(this, "Please select an image first.", "Does not compute...", MessageBoxButtons.OK);
this.cmdSelectSrc_Click(sender, e);
return;
}
bool done = false;
int seed = bmp.GetPixel(0, 0).ToArgb();
Color cPwReq = bmp.GetPixel(1, 0);
byte[] rsaBlob = null;
if (cPwReq.R % 2 == 0 && cPwReq.G % 2 == 0 && cPwReq.B % 2 == 0)
{
using (frmPw frm = new frmPw())
if (frm.ShowDialog(this) == DialogResult.OK && !string.IsNullOrEmpty(frm.Password))
{
seed = (seed.ToString() + frm.Password.ToString()).GetHashCode();
//rsaBlob = System.Text.Encoding.UTF8.GetBytes(seed.ToString());
}
}
Dictionary <string, string> cypher = this.GetCypher(seed, true);
int x = 3, y = 0;
StringBuilder identCheck = new StringBuilder();
#region Old Read Method
//for (int i = 0; i < identString.Length; i++)
//{
// if (x++ > bmp.Width)
// { x = 0; y++; }
// Color cPxl1 = bmp.GetPixel(x, y);
// int r1 = Convert.ToInt32(cPxl1.R),
// g1 = Convert.ToInt32(cPxl1.G),
// b1 = Convert.ToInt32(cPxl1.B);
// if (x++ > bmp.Width)
// { x = 0; y++; }
// Color cPxl2 = bmp.GetPixel(x, y);
// int r2 = Convert.ToInt32(cPxl2.R),
// g2 = Convert.ToInt32(cPxl2.G),
// b2 = Convert.ToInt32(cPxl2.B);
// if (x++ > bmp.Width)
// { x = 0; y++; }
// Color cPxl3 = bmp.GetPixel(x, y);
// int r3 = Convert.ToInt32(cPxl3.R),
// g3 = Convert.ToInt32(cPxl3.G),
// b3 = Convert.ToInt32(cPxl3.B);
// int c1 = (r1 % 2),
// c2 = (g1 % 2),
// c3 = (b1 % 2),
// c4 = (r2 % 2),
// c5 = (g2 % 2),
// c6 = (b2 % 2),
// c7 = (r3 % 2),
// c8 = (g3 % 2),
// c9 = (b3 % 2);
// string cypherCode = GetCypherCode(c1, c2, c3, c4, c5, c6, c7, c8);
// try
// { identCheck.Append(cypher[cypherCode]); }
// catch
// { break; }
//}
#endregion
string msgText = null;
using (System.IO.FileStream fs = new System.IO.FileStream(this._imgFn, System.IO.FileMode.Open, System.IO.FileAccess.Read))
{
//int identBufferLen = (identString.Length * 9) + x;
//byte[] fsBuffer = new byte[identBufferLen];
//fs.Read(fsBuffer, 0, fsBuffer.Length);
//for (int i = x; i < fsBuffer.Length; i += 9)
//{
// if (i > fsBuffer.Length)
// throw new Exception("Key check exceeded buffer length.");
// int[] vals = new int[8];
// for (int j = 0; j < 8; j++)
// vals[j] = (fsBuffer[i] % 2);
// string cypherCode = GetCypherCode(vals);
// try
// { identCheck.Append(cypher[cypherCode]); }
// catch
// { break; }
// x += 9;
//}
for (int i = x; i < identString.Length + 3; i++)
{
Color cPxl1 = bmp.GetPixel(x, y);
int r1 = Convert.ToInt32(cPxl1.R),
g1 = Convert.ToInt32(cPxl1.G),
b1 = Convert.ToInt32(cPxl1.B);
if (x++ > bmp.Width)
{
x = 0; y++;
}
Color cPxl2 = bmp.GetPixel(x, y);
int r2 = Convert.ToInt32(cPxl2.R),
g2 = Convert.ToInt32(cPxl2.G),
b2 = Convert.ToInt32(cPxl2.B);
if (x++ > bmp.Width)
{
x = 0; y++;
}
Color cPxl3 = bmp.GetPixel(x, y);
int r3 = Convert.ToInt32(cPxl3.R),
g3 = Convert.ToInt32(cPxl3.G),
b3 = Convert.ToInt32(cPxl3.B);
int c1 = (r1 % 2),
c2 = (g1 % 2),
c3 = (b1 % 2),
c4 = (r2 % 2),
c5 = (g2 % 2),
c6 = (b2 % 2),
c7 = (r3 % 2),
c8 = (g3 % 2),
c9 = (b3 % 2);
// Determine the bits "code value" and find the matching character in the cypher.
string cypherCode = GetCypherCode(c1, c2, c3, c4, c5, c6, c7, c8);
identCheck.Append(cypher[cypherCode]);
}
if (identCheck.ToString() != identString)
{
MessageBox.Show(this, "No message detected.", "Sorry");
return;
}
StringBuilder sbMsg = new StringBuilder();
x = identString.Length + 2; y = 0;
while (!done)
{
// Every three pixels contains 8 "bits" of cypher code, and the
// 9th byte tells us if we're done (by being an odd number).
if (x++ > bmp.Width)
{
x = 0; y++;
}
Color cPxl1 = bmp.GetPixel(x, y);
int r1 = Convert.ToInt32(cPxl1.R),
g1 = Convert.ToInt32(cPxl1.G),
b1 = Convert.ToInt32(cPxl1.B);
if (x++ > bmp.Width)
{
x = 0; y++;
}
Color cPxl2 = bmp.GetPixel(x, y);
int r2 = Convert.ToInt32(cPxl2.R),
g2 = Convert.ToInt32(cPxl2.G),
b2 = Convert.ToInt32(cPxl2.B);
if (x++ > bmp.Width)
{
x = 0; y++;
}
Color cPxl3 = bmp.GetPixel(x, y);
int r3 = Convert.ToInt32(cPxl3.R),
g3 = Convert.ToInt32(cPxl3.G),
b3 = Convert.ToInt32(cPxl3.B);
int c1 = (r1 % 2),
c2 = (g1 % 2),
c3 = (b1 % 2),
c4 = (r2 % 2),
c5 = (g2 % 2),
c6 = (b2 % 2),
c7 = (r3 % 2),
c8 = (g3 % 2),
c9 = (b3 % 2);
// Determine the bits "code value" and find the matching character in the cypher.
string cypherCode = GetCypherCode(c1, c2, c3, c4, c5, c6, c7, c8);
sbMsg.Append(cypher[cypherCode]);
// Then decide if we should keep processing based on whether the 6th bit
// was divisible by 2.
if (c9 != 0)
{
done = true;
break;
}
x += 9;
#region New read method is wrong. Deals with pixels as though they were one byte each and starts are wrong position.
//byte[] fsBufferMsg = new byte[9];
//fs.Read(fsBufferMsg, x, fsBufferMsg.Length);
//int[] vals = new int[9];
//for (int j = 0; j < 9; j++)
// vals[j] = (fsBufferMsg[j] % 2);
//string cypherCode = GetCypherCode(vals);
//sbMsg.Append(cypher[cypherCode]);
//// then decide if we should keep processing based on whether the
//// 9th byte was divisible by 2.
//if (vals[8] != 0)
//{
// done = true;
// break;
//}
//x += 9;
#endregion
}
msgText = sbMsg.ToString();
}
Color cRsa = bmp.GetPixel(2, 0);
if (cRsa.R % 2 == 0 && cRsa.G % 2 == 0 && cRsa.B % 2 == 0 && rsaBlob != null)
{
System.Security.Cryptography.RSACryptoServiceProvider rsa = new System.Security.Cryptography.RSACryptoServiceProvider();
//rsa.ImportCspBlob(rsa.Encrypt(rsaBlob, true));
byte[] rsaData = rsa.Decrypt(Convert.FromBase64String(msgText), true);
msgText = System.Text.Encoding.UTF8.GetString(rsaData);
}
MessageBox.Show(this, "Image Says:\n\n" + msgText, "Message");
}
//***************************************************************************
// Event Handlers
//
private void btnSave_Click(object sender, EventArgs e)
{
if (this.bmp == null)
{
return;
}
#region Old Write Method
//// The color code of the very first pixel gives of the cypher "seed".
//int seed = bmp.GetPixel(0, 0).ToArgb();
//Color cPwReq = bmp.GetPixel(1, 0);
//int cPwReqR = cPwReq.R, cPwReqG = cPwReq.G, cPwReqB = cPwReq.B;
//byte[] rsaBlob = null;
//using (frmPw frm = new frmPw())
// if (frm.ShowDialog(this) == DialogResult.OK && !string.IsNullOrEmpty(frm.Password))
// {
// seed = (seed.ToString() + frm.Password).GetHashCode();
// rsaBlob = System.Text.Encoding.UTF8.GetBytes(seed.ToString());
// if (cPwReqR % 2 != 0)
// if (cPwReqR < 255) cPwReqR++; else cPwReqR--;
// if (cPwReqG % 2 != 0)
// if (cPwReqG < 255) cPwReqG++; else cPwReqG--;
// if (cPwReqB % 2 != 0)
// if (cPwReqB < 255) cPwReqB++; else cPwReqB--;
// }
//cPwReq = Color.FromArgb(cPwReq.A, cPwReqR, cPwReqG, cPwReqB);
//bmp.SetPixel(1, 0, cPwReq);
//Dictionary<string, string> cypher = this.GetCypher(seed, false);
//string encryptString = this.textBox1.Text;
//if (this.chkEncrypt.Checked && rsaBlob != null)
//{
// System.Security.Cryptography.RSACryptoServiceProvider rsa = new System.Security.Cryptography.RSACryptoServiceProvider();
// rsa.ImportCspBlob(rsa.Encrypt(rsaBlob, true));
// byte[] rsaData = rsa.Encrypt(System.Text.Encoding.UTF8.GetBytes(encryptString), true);
// encryptString = Convert.ToBase64String(rsaData);
// Color cRsa = bmp.GetPixel(2, 0);
// int cRsaR = cRsa.R, cRsaG = cRsa.G, cRsaB = cRsa.B;
// if (cRsaR % 2 != 0)
// if (cRsaR < 255) cRsaR++; else cRsaR--;
// if (cRsaG % 2 != 0)
// if (cRsaG < 255) cRsaG++; else cRsaG--;
// if (cRsaB % 2 != 0)
// if (cRsaB < 255) cRsaB++; else cRsaB--;
// bmp.SetPixel(2, 0, Color.FromArgb(cRsa.A, cRsaR, cRsaG, cRsaB));
//}
//encryptString = identString + encryptString;
//// Now, we're ready to embed the text as a cypher.
//int x = 2, y = 0;
//for (int charPos = 0; charPos < encryptString.Length; charPos++)
//{
// // First, get the character at the current position of the secret string.
// string curChar = encryptString.Substring(charPos, 1);
// // Now determine the character's cypher code.
// string cypherCode = string.Empty;
// try
// { cypherCode = cypher[curChar]; }
// catch
// // If we don't have that character in our cypher, just ignore it.
// {
// MessageBox.Show(this, "Unable to find cypher value for character: " + curChar, "Error");
// return;
// }
// // Then, we set the pixels' bits to match the cypher code.
// for (int i = 0; i < cypherCode.Length; i += 3)
// {
// if (x++ > bmp.Width)
// { x = 0; y++; }
// if (y > bmp.Height)
// throw new Exception("The image is too small to contain the selected text.");
// // Now, get the pixel at the current position.
// Color cpxl = bmp.GetPixel(x, y);
// int r = Convert.ToInt32(cpxl.R),
// g = Convert.ToInt32(cpxl.G),
// b = Convert.ToInt32(cpxl.B);
// if (cypherCode.Substring(i, 1) != (r % 2).ToString())
// if (r < 255) r++; else r--;
// if (cypherCode.Substring(i + 1, 1) != (g % 2).ToString())
// if (g < 255) g++; else g--;
// if (i + 2 < cypherCode.Length)
// {
// if (cypherCode.Substring(i + 2, 1) != (b % 2).ToString())
// if (b < 255) b++; else b--;
// }
// else
// // For the "ninth" byte in the two pixels, we define whether
// // or not this is the last character with an odd number
// // informing the program to stop parsing.
// if (charPos < encryptString.Length - 1)
// {
// if ((b % 2) != 0)
// { if (b < 255)b++; else b--; }
// }
// else
// {
// if ((b % 2) != 1)
// { if (b < 255)b++; else b--; }
// }
// // Once we have the correct color values, we need to save them
// // back into the image.
// Color nClr = Color.FromArgb(cpxl.A, r, g, b);
// bmp.SetPixel(x, y, nClr);
// }
//}
#endregion
string outputFn = null;
using (SaveFileDialog dlg = new SaveFileDialog())
{
dlg.AddExtension = true;
dlg.DefaultExt = ".bmp";
dlg.Filter = "Image Files|*.bmp;*.jpg;*gif;*.png;*.jpeg;*.tiff|All Files|*.*";
dlg.FilterIndex = 0;
dlg.Title = "Select Image File";
if (dlg.ShowDialog(this) == DialogResult.OK)
{
outputFn = dlg.FileName;
}
else
{
return;
}
}
// The color code of the very first pixel gives of the cypher "seed".
int seed = bmp.GetPixel(0, 0).ToArgb();
Color cPwReq = bmp.GetPixel(1, 0);
int cPwReqR = cPwReq.R, cPwReqG = cPwReq.G, cPwReqB = cPwReq.B;
byte[] rsaBlob = null;
using (frmPw frm = new frmPw())
if (frm.ShowDialog(this) == DialogResult.OK && !string.IsNullOrEmpty(frm.Password))
{
seed = (seed.ToString() + frm.Password).GetHashCode();
rsaBlob = System.Text.Encoding.UTF8.GetBytes(seed.ToString());
if (cPwReqR % 2 != 0)
{
if (cPwReqR < 255)
{
cPwReqR++;
}
else
{
cPwReqR--;
}
}
if (cPwReqG % 2 != 0)
{
if (cPwReqG < 255)
{
cPwReqG++;
}
else
{
cPwReqG--;
}
}
if (cPwReqB % 2 != 0)
{
if (cPwReqB < 255)
{
cPwReqB++;
}
else
{
cPwReqB--;
}
}
}
cPwReq = Color.FromArgb(cPwReq.A, cPwReqR, cPwReqG, cPwReqB);
bmp.SetPixel(1, 0, cPwReq);
Dictionary <string, string> cypher = this.GetCypher(seed, false);
string encryptString = this.textBox1.Text;
if (this.chkEncrypt.Checked && rsaBlob != null)
{
System.Security.Cryptography.RSACryptoServiceProvider rsa = new System.Security.Cryptography.RSACryptoServiceProvider();
//rsa.ImportCspBlob(rsa.Encrypt(rsaBlob, true));
byte[] rsaData = rsa.Encrypt(System.Text.Encoding.UTF8.GetBytes(encryptString), true);
encryptString = Convert.ToBase64String(rsaData);
Color cRsa = bmp.GetPixel(2, 0);
int cRsaR = cRsa.R, cRsaG = cRsa.G, cRsaB = cRsa.B;
if (cRsaR % 2 != 0)
{
if (cRsaR < 255)
{
cRsaR++;
}
else
{
cRsaR--;
}
}
if (cRsaG % 2 != 0)
{
if (cRsaG < 255)
{
cRsaG++;
}
else
{
cRsaG--;
}
}
if (cRsaB % 2 != 0)
{
if (cRsaB < 255)
{
cRsaB++;
}
else
{
cRsaB--;
}
}
bmp.SetPixel(2, 0, Color.FromArgb(cRsa.A, cRsaR, cRsaG, cRsaB));
}
encryptString = identString + encryptString;
// Now, we're ready to embed the text as a cypher.
int x = 2, y = 0;
for (int charPos = 0; charPos < encryptString.Length; charPos++)
{
// First, get the character at the current position of the secret string.
string curChar = encryptString.Substring(charPos, 1);
// Now determine the character's cypher code.
string cypherCode = string.Empty;
try
{ cypherCode = cypher[curChar]; }
catch
// If we don't have that character in our cypher, just ignore it.
{
MessageBox.Show(this, "Unable to find cypher value for character: " + curChar, "Error");
return;
}
// Then, we set the pixels' bits to match the cypher code.
for (int i = 0; i < cypherCode.Length; i += 3)
{
if (++x >= bmp.Width)
{
x = 0; ++y;
}
if (y >= bmp.Height)
{
throw new Exception("The image is too small to contain the selected text.");
}
// Now, get the pixel at the current position.
Color cpxl = bmp.GetPixel(x, y);
int r = Convert.ToInt32(cpxl.R),
g = Convert.ToInt32(cpxl.G),
b = Convert.ToInt32(cpxl.B);
if (cypherCode.Substring(i, 1) != (r % 2).ToString())
{
if (r < 255)
{
r++;
}
else
{
r--;
}
}
if (cypherCode.Substring(i + 1, 1) != (g % 2).ToString())
{
if (g < 255)
{
g++;
}
else
{
g--;
}
}
if (i + 2 < cypherCode.Length)
{
if (cypherCode.Substring(i + 2, 1) != (b % 2).ToString())
{
if (b < 255)
{
b++;
}
else
{
b--;
}
}
}
else
// For the "ninth" byte in the two pixels, we define whether
// or not this is the last character with an odd number
// informing the program to stop parsing.
if (charPos < encryptString.Length - 1)
{
if ((b % 2) != 0)
{
if (b < 255)
{
b++;
}
else
{
b--;
}
}
}
else
{
if ((b % 2) != 1)
{
if (b < 255)
{
b++;
}
else
{
b--;
}
}
}
// Once we have the correct color values, we need to save them
// back into the image.
Color nClr = Color.FromArgb(cpxl.A, r, g, b);
bmp.SetPixel(x, y, nClr);
}
}
bmp.Save(outputFn, System.Drawing.Imaging.ImageFormat.Bmp);
}
