protected static Byte[] computeHash(Byte[] message, hashTypes selectedHash)
{
Byte[] hash = new Byte[0];
switch (selectedHash)
{
case hashTypes.NONE:
break;
case hashTypes.MD5:
MD5 md5Hash = MD5.Create();
hash = md5Hash.ComputeHash(message);
break;
case hashTypes.SHA256:
SHA256 sha256 = SHA256.Create();
hash = sha256.ComputeHash(message);
break;
case hashTypes.SHA512:
SHA512 sha512 = SHA512.Create();
hash = sha512.ComputeHash(message);
break;
}
return(hash);
}
private void sHA512ToolStripMenuItem_Click(object sender, EventArgs e)
{
selectedHash = hashTypes.SHA512;
noneToolStripMenuItem.Checked = false;
mD5ToolStripMenuItem.Checked = false;
sHA256ToolStripMenuItem.Checked = false;
sHA512ToolStripMenuItem.Checked = true;
}
new public static Color[] encodeMessage(Color[] pixelArray, Byte[] message, hashTypes selectedHash)
{
encodeByte(0, (byte)((message.Length >> 8) & 0xFF), pixelArray);
encodeByte(1, (byte)((message.Length) & 0xFF), pixelArray);
encodeByte(2, 0xAA, pixelArray);
//Compute the message hash
Byte[] hash = computeHash(message, selectedHash);
encodeByteArray(3, hash, pixelArray);
encodeByteArray(3 + hash.Length, message, pixelArray);
return(pixelArray);
}
new public static Byte[] decodeMessage(Color[] pixelArray, hashTypes selectedHash)
{
//bool padding = oaepPadding.Checked;
int messageSize = (((int)decodeByte(0, pixelArray)) << 8) + ((int)decodeByte(1, pixelArray));
Byte[] message = new byte[messageSize];
//int hash = (int)decodeByte(2, pixelArray);
int hashSize = 0;
//Compute the size of the hash
switch (selectedHash)
{
case hashTypes.MD5:
hashSize = 16;
break;
case hashTypes.SHA256:
hashSize = 32;
break;
case hashTypes.SHA512:
hashSize = 64;
break;
}
Byte[] hash = decodeByteArray(3, hashSize, pixelArray);
message = decodeByteArray(3 + hashSize, messageSize, pixelArray);
if (!compareHashes(hash, computeHash(message, selectedHash)))
{
MessageBox.Show("Hashes do not match!", "Decoding Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
return(message);
}
private void sha256Hash_CheckedChanged(object sender, EventArgs e)
{
selectedHash = hashTypes.SHA256;
}
private void md5Hash_CheckedChanged(object sender, EventArgs e)
{
selectedHash = hashTypes.MD5;
}
private void noHash_CheckedChanged(object sender, EventArgs e)
{
selectedHash = hashTypes.NONE;
}
public static Byte[] decodeMessage(Color[] pixelArray, hashTypes selectedHash)
{
return(new byte[0]);
}
public static Color[] encodeMessage(Color[] pixelArray, Byte[] message, hashTypes selectedHash)
{
return(pixelArray);
}
