public List <Complex[]> embedWatermark(List <Complex[]> complexframes, KeyGen key)
{
Debug.WriteLine("User Key Generated");
Debug.WriteLine("Before Fourier Transform Inverse");
complexframes = key.embedWatermark(complexframes);
return(complexframes);
}
public List<Complex[]> readAudio(int userid, int frameLength, int mode)
{
//mode1 embed ; mode2 verify
byte[] file = fileReader();
bytestodata = KeyGen.SimpleBoyerMooreSearch(file, datasection);
subchunksize = new byte[4];
subchunksize[0] = file[16];
subchunksize[1] = file[17];
subchunksize[2] = file[18];
subchunksize[3] = file[19];
//converting file into double[]
int headerLength = audioHeaderLength();
double[] x = ByteToDouble(file, headerLength);
Debug.WriteLine("Header Length : " + headerLength);
//convert double[] into complex[]
Complex[] samples = DoubleToComplex(x);
Debug.WriteLine("samples.Length " + samples.Length);
//split complex[] into frames
var frames = samples.Batch(frameLength);
int frameCount = 0;
int remainder = 0;
List<Complex[]> complexframes = new List<Complex[]>();
foreach (var batch in frames)
{
remainder = batch.Count();
frameCount++;
foreach (var frame in batch)
{
}
complexframes.Add(batch.ToArray());
}
Debug.WriteLine("Before Fourier Transform Forward");
foreach (var frame in complexframes)
{
Transform.FourierForward(frame);
}
if (mode == 1 && userid != 0)
{
//embedwatermark
KeyGen key = new KeyGen(userid, frameLength, frameCount, name);
complexframes = embedWatermark(complexframes, key);
//convert complex[] to byte[]
byte[] output = new byte[((frameCount - 1) * frameLength) + remainder + headerLength];
int bytecounter = 0;
foreach (var frame in complexframes)
{
foreach (var singlecomplex in frame)
{
output[bytecounter + headerLength] = (byte)(Convert.ToInt16(singlecomplex.Real * 32768.0));
bytecounter++;
}
}
for (int i = 0; i < headerLength - 1; i++)
{
output[i] = file[i];
}
Debug.WriteLine("Writing new file : " + path + "new_" + name);
ByteArrayToFile(path + "new_" + name, output);
Debug.WriteLine("File Successfully written");
DBConnect connection = new DBConnect();
string query = "UPDATE keydata SET keydatakey=@datakey where (iduserdata=@userid) and (keysongname=@name) ";
try
{
MySqlCommand cmd = new MySqlCommand(query, connection.OpenConnection());
cmd.CommandText = query;
cmd.Prepare();
cmd.Parameters.AddWithValue("@datakey", KeyGen.ToHex(MD5.Create().ComputeHash(File.ReadAllBytes(path + "new_" + name)),true));
cmd.Parameters.AddWithValue("@userid", userid);
cmd.Parameters.AddWithValue("@name", name);
Debug.WriteLine(MD5.Create().ComputeHash(File.ReadAllBytes(path + "new_" + name)));
cmd.ExecuteNonQuery();
connection.CloseConnection();
}
catch (Exception ex)
{
Debug.WriteLine("SQL INSERT INTO KEYDATA FAILED!");
}
return null;
}
return complexframes;
}
public List<Complex[]> embedWatermark(List<Complex[]> complexframes, KeyGen key)
{
Debug.WriteLine("User Key Generated");
Debug.WriteLine("Before Fourier Transform Inverse");
complexframes = key.embedWatermark(complexframes);
return complexframes;
}
public static string verifyWatermark(List <Complex[]> complexframes1, List <Complex[]> complexframes2, int userid, string filename, string watermarkpath)
{
int shorter;
if (complexframes1[0].Length >= complexframes2[0].Length)
{
shorter = complexframes2[0].Length;
}
else
{
shorter = complexframes1[0].Length;
}
string storedkey = "";
string name = "";
string regno = "";
string address = "";
string contact = "";
string keyinfo = "";
string datakey = "";
DBConnect connection = new DBConnect();
string query = "SELECT keydata.keydatadata, userdata.userdataname, userdata.userdataregno, userdata.userdataaddress, userdata.userdatacontact, keydata.keydatainfo, keydata.keydatakey FROM keydata INNER JOIN userdata ON keydata.iduserdata = userdata.iduserdata WHERE (keydata.iduserdata = @userid) AND (keydata.keysongname = @songname)";
try
{
MySqlCommand cmd = new MySqlCommand(query, connection.OpenConnection());
cmd.CommandText = query;
cmd.Prepare();
cmd.Parameters.AddWithValue("@userid", userid);
cmd.Parameters.AddWithValue("@songname", filename);
MySqlDataReader Reader = cmd.ExecuteReader();
if (!Reader.HasRows)
{
return("No Matches found in Database!");
}
while (Reader.Read())
{
name = KeyGen.GetDBString("userdataname", Reader);
regno = KeyGen.GetDBString("userdataregno", Reader);
storedkey = KeyGen.GetDBString("keydatadata", Reader);
address = KeyGen.GetDBString("userdataaddress", Reader);
contact = KeyGen.GetDBString("userdatacontact", Reader);
keyinfo = KeyGen.GetDBString("keydatainfo", Reader);
datakey = KeyGen.GetDBString("keydatakey", Reader);
}
Reader.Close();
connection.CloseConnection();
}
catch (Exception ex)
{
}
if (!storedkey.Equals("") && (storedkey != null))
{
double[] d = KeyGen.StringToDoubleArr(storedkey);
double[] weight = new double[5];
double avg = 0;
for (int h = 0; h < complexframes1.Count; h++)
{
Complex[] difference = new Complex[shorter];
for (int i = 0; i < 5; i++)
{
difference[i] = complexframes2[h][i] - complexframes1[h][i];
weight[i] = difference[i].Real / d[i];
}
avg = avg + weight.Average();
}
avg = avg / complexframes1.Count;
StringBuilder strOutputInfo = new StringBuilder();
//if (Math.Abs(avg) >= 0.7 && Math.Abs(avg) <= 1.51)
Debug.WriteLine(datakey);
Debug.WriteLine(KeyGen.ToHex(MD5.Create().ComputeHash(File.ReadAllBytes(watermarkpath)), true));
byte[] computedkeydata = MD5.Create().ComputeHash(File.ReadAllBytes(watermarkpath));
if (datakey.Equals(KeyGen.ToHex(MD5.Create().ComputeHash(File.ReadAllBytes(watermarkpath)), true)))
{
strOutputInfo.Append("Watermark is Verified<br />");
strOutputInfo.Append("Registered User : "******"<br />");
strOutputInfo.Append("Registration # : " + regno + "<br />");
strOutputInfo.Append("User's Contact : " + contact + "<br />");
strOutputInfo.Append("User's Address : " + address + "<br />");
strOutputInfo.Append("Watermark Info : " + keyinfo + "<br />");
return(strOutputInfo.ToString());
}
else
{
strOutputInfo.Append("Watermark is Rejected");
return(strOutputInfo.ToString());
}
}
else
{
return("No Matches found in Database!");
}
}
public List <Complex[]> readAudio(int userid, int frameLength, int mode)
{
//mode1 embed ; mode2 verify
byte[] file = fileReader();
bytestodata = KeyGen.SimpleBoyerMooreSearch(file, datasection);
subchunksize = new byte[4];
subchunksize[0] = file[16];
subchunksize[1] = file[17];
subchunksize[2] = file[18];
subchunksize[3] = file[19];
//converting file into double[]
int headerLength = audioHeaderLength();
double[] x = ByteToDouble(file, headerLength);
Debug.WriteLine("Header Length : " + headerLength);
//convert double[] into complex[]
Complex[] samples = DoubleToComplex(x);
Debug.WriteLine("samples.Length " + samples.Length);
//split complex[] into frames
var frames = samples.Batch(frameLength);
int frameCount = 0;
int remainder = 0;
List <Complex[]> complexframes = new List <Complex[]>();
foreach (var batch in frames)
{
remainder = batch.Count();
frameCount++;
foreach (var frame in batch)
{
}
complexframes.Add(batch.ToArray());
}
Debug.WriteLine("Before Fourier Transform Forward");
foreach (var frame in complexframes)
{
Transform.FourierForward(frame);
}
if (mode == 1 && userid != 0)
{
//embedwatermark
KeyGen key = new KeyGen(userid, frameLength, frameCount, name);
complexframes = embedWatermark(complexframes, key);
//convert complex[] to byte[]
byte[] output = new byte[((frameCount - 1) * frameLength) + remainder + headerLength];
int bytecounter = 0;
foreach (var frame in complexframes)
{
foreach (var singlecomplex in frame)
{
output[bytecounter + headerLength] = (byte)(Convert.ToInt16(singlecomplex.Real * 32768.0));
bytecounter++;
}
}
for (int i = 0; i < headerLength - 1; i++)
{
output[i] = file[i];
}
Debug.WriteLine("Writing new file : " + path + "new_" + name);
ByteArrayToFile(path + "new_" + name, output);
Debug.WriteLine("File Successfully written");
DBConnect connection = new DBConnect();
string query = "UPDATE keydata SET keydatakey=@datakey where (iduserdata=@userid) and (keysongname=@name) ";
try
{
MySqlCommand cmd = new MySqlCommand(query, connection.OpenConnection());
cmd.CommandText = query;
cmd.Prepare();
cmd.Parameters.AddWithValue("@datakey", KeyGen.ToHex(MD5.Create().ComputeHash(File.ReadAllBytes(path + "new_" + name)), true));
cmd.Parameters.AddWithValue("@userid", userid);
cmd.Parameters.AddWithValue("@name", name);
Debug.WriteLine(MD5.Create().ComputeHash(File.ReadAllBytes(path + "new_" + name)));
cmd.ExecuteNonQuery();
connection.CloseConnection();
}
catch (Exception ex)
{
Debug.WriteLine("SQL INSERT INTO KEYDATA FAILED!");
}
return(null);
}
return(complexframes);
}
