/// <summary>
/// Read data from the stream and encrypt it.
/// </summary>
/// <param name="buffer">The buffer to read into.</param>
/// <param name="offset">The offset in the buffer to begin storing data.</param>
/// <param name="count">The number of bytes to read.</param>
/// <returns></returns>
public override int Read(byte[] buffer, int offset, int count)
{
int bytesRead = stream.Read(buffer, offset, count);
if (target == Target.Normal)
{
bf.Encipher(buffer, bytesRead);
}
else
{
bf.Decipher(buffer, bytesRead);
}
return(bytesRead);
}
internal static byte[] Cipher(byte[] buffer, ref byte[] key, bool decrypt)
{
var cipher = new Blowfish(key);
var b = new byte[8];
using (var m = new MemoryStream(buffer, true))
{
while (m.Position < m.Length)
{
//Endian swap 2 sets of 4 bytes
for (int i = 3; i >= 0; i--)
{
b[i] = (byte)m.ReadByte();
}
for (int i = 7; i >= 4; i--)
{
b[i] = (byte)m.ReadByte();
}
//cipher the 8 bytes
if (decrypt) cipher.Decipher(b, 8);
else cipher.Encipher(b, 8);
//Reset stream position to prepare for writing.
m.Position -= 8;
//Endian swap 4 bytes twice
for (int i = 3; i >= 0; i--)
{
m.WriteByte(b[i]);
}
for (int i = 7; i >= 4; i--)
{
m.WriteByte(b[i]);
}
}
}
return buffer;
}
public void TestArray()
{
string key = "TestKey1";
UTF8Encoding utf8 = new UTF8Encoding();
Blowfish bf = new Blowfish(utf8.GetBytes(key));
string data = "If you can read this it worked ";
byte[] en = utf8.GetBytes(data);
bf.Encipher(en, en.Length);
bf.Decipher(en, en.Length);
Console.WriteLine(utf8.GetString(en, 0, en.Length));
}
