public static byte[] EncryptText(byte[] wav, string text)
{
WavAudio audio = new WavAudio(wav);
uint value = 0;
string pass = string.Format(audio.bitsPerSample.ToString());
AESEncrypt encrypt = new AESEncrypt();
string encrypted = encrypt.EncryptString(text, pass);
OutputConsole.Write(string.Format("Text encrypted \n{0}", encrypted));
if (encrypted.Length <= Math.Floor((double)(audio.totalSamples / 8)))
{
SeedURNG generator = new SeedURNG(audio.totalSamples, audio.totalSamples);
OutputConsole.Write("Seed generated");
OutputConsole.Write("Processing wav file...");
for (int i = 0; i < encrypted.Length; i++)
{
value = encrypted[i];
for (int x = 0; x < 8; x++)
{
uint sample = generator.Next;
uint sampleValue = audio.samples[sample];
sampleValue = (sampleValue & 0xFFFFFFFE) | ((value >> x) & 1);
audio.samples[sample] = sampleValue;
}
}
value = 0;
for (int x = 0; x < 8; x++)
{
uint sample = generator.Next;
uint sampleValue = audio.samples[sample];
sampleValue = (sampleValue & 0xFFFFFFFE) | ((value >> x) & 1);
audio.samples[sample] = sampleValue;
}
audio.Save();
OutputConsole.Write(string.Format("Text encrypted... used {0} samples", encrypted.Length * 8));
OutputConsole.Write("Saving wav file");
return(audio.data);
}
else
{
return(null);
}
}
public static string DecryptText(byte[] wav)
{
WavAudio audio = new WavAudio(wav);
string text = string.Empty;
SeedURNG generator = new SeedURNG(audio.totalSamples, audio.totalSamples);
uint value = 0;
string pass = string.Format(audio.bitsPerSample.ToString());
AESEncrypt encrypt = new AESEncrypt();
OutputConsole.Write("Processing wav file...");
do
{
value = 0;
for (int x = 0; x < 8; x++)
{
uint sample = generator.Next;
uint sampleValue = audio.samples[sample];
value = value | ((sampleValue & 1) << x);
}
if (value != 0)
{
text += Convert.ToChar(value);
}
} while (value != 0);
OutputConsole.Write("Decrypting text...");
try
{
return(encrypt.DecryptString(text, pass));
}
catch (Exception e)
{
OutputConsole.Write("Error: Text not found");
Console.WriteLine(e.Message);
return(null);
}
}
public static HiddenFile DecryptFile2(byte[] wav)
{
try
{
WavAudio audio = new WavAudio(wav);
string text = string.Empty;
SeedURNG generator = new SeedURNG(audio.totalSamples, audio.totalSamples, true);
OutputConsole.Write("Seed generated");
OutputConsole.Write("Processing wav file...");
OutputConsole.Write("Reading metadata...");
uint value = 0;
do
{
value = 0;
for (int x = 0; x < 8; x++)
{
uint sample = generator.NextN;
uint sampleValue = audio.samples[sample];
value = value | ((sampleValue & 1) << x);
}
if (value != '#')
{
text += Convert.ToChar(value);
}
} while (value != '#' && char.IsNumber((char)value));
int filesize = int.Parse(text);
OutputConsole.Write(string.Format("Extracted file size: {0} bytes", filesize));
text = string.Empty;
do
{
value = 0;
for (int x = 0; x < 8; x++)
{
uint sample = generator.NextN;
uint sampleValue = audio.samples[sample];
value = value | ((sampleValue & 1) << x);
}
if (value != 0)
{
text += Convert.ToChar(value);
}
} while (value != 0);
string filename = text;
OutputConsole.Write(string.Format("Extracted file name: {0}", filename));
byte[] file = new byte[filesize];
for (int i = 0; i < filesize; i++)
{
value = 0;
for (int x = 0; x < 8; x++)
{
uint sample = generator.NextN;
uint sampleValue = audio.samples[sample];
value = value | ((sampleValue & 1) << x);
}
file[i] = (byte)value;
}
OutputConsole.Write(string.Format("Extracted file content"));
HiddenFile f = new HiddenFile(file, filename);
OutputConsole.Write("Ciphering file...");
f.cipherFile((int)audio.totalSamples);
return(f);
}
catch (Exception e)
{
return(null);
}
}
public static byte[] EncryptFile2(byte[] wav, byte[] file, string filename)
{
WavAudio audio = new WavAudio(wav);
uint value = 0;
int extraBytes = 2 + filename.Length + file.Length.ToString().Length;
HiddenFile f = new HiddenFile(file, filename);
OutputConsole.Write(string.Format("File size: {0} bytes", file.Length));
f.cipherFile((int)audio.totalSamples);
if (file.Length <= Math.Floor((double)(audio.totalSamples / 8)) - extraBytes)
{
SeedURNG generator = new SeedURNG(audio.totalSamples, audio.totalSamples, true);
OutputConsole.Write("Seed generated");
OutputConsole.Write("Ciphering file");
OutputConsole.Write("Processing wav file...");
OutputConsole.Write("Writing metadata...");
//Write file size
for (int i = 0; i < file.Length.ToString().Length; i++)
{
value = file.Length.ToString()[i];
for (int x = 0; x < 8; x++)
{
uint sample = generator.NextN;
uint sampleValue = audio.samples[sample];
sampleValue = (sampleValue & 0xFFFFFFFE) | ((value >> x) & 1);
audio.samples[sample] = sampleValue;
}
}
value = '#';
for (int x = 0; x < 8; x++)
{
uint sample = generator.NextN;
uint sampleValue = audio.samples[sample];
sampleValue = (sampleValue & 0xFFFFFFFE) | ((value >> x) & 1);
audio.samples[sample] = sampleValue;
}
//Write file name
for (int i = 0; i < filename.Length; i++)
{
value = filename[i];
for (int x = 0; x < 8; x++)
{
uint sample = generator.NextN;
uint sampleValue = audio.samples[sample];
sampleValue = (sampleValue & 0xFFFFFFFE) | ((value >> x) & 1);
audio.samples[sample] = sampleValue;
}
}
value = 0;
for (int x = 0; x < 8; x++)
{
uint sample = generator.NextN;
uint sampleValue = audio.samples[sample];
sampleValue = (sampleValue & 0xFFFFFFFE) | ((value >> x) & 1);
audio.samples[sample] = sampleValue;
}
//Write file content
OutputConsole.Write("Writing file data...");
for (int i = 0; i < file.Length; i++)
{
value = f.file[i];
for (int x = 0; x < 8; x++)
{
uint sample = generator.NextN;
uint sampleValue = audio.samples[sample];
sampleValue = (sampleValue & 0xFFFFFFFE) | ((value >> x) & 1);
audio.samples[sample] = sampleValue;
}
}
}
else
{
OutputConsole.Write("Error");
return(null);
}
OutputConsole.Write("Finished embedding file");
OutputConsole.Write(string.Format("Used {0} samples", (file.Length + extraBytes) * 8));
audio.Save();
return(audio.data);
}
