public static byte[] Encode(StreamCtx ctx, byte[] data, bool encrypt)
{
MemoryStream instr = null;
MemoryStream outstr = null;
byte[] buffer = null;
try
{
instr = new MemoryStream(data, false);
outstr = new MemoryStream((data.Length - (data.Length % ctx.BlockSize())) + ctx.BlockSize());
if (encrypt)
{
Encrypt(ctx, instr, outstr);
}
else
{
Decrypt(ctx, instr, outstr);
}
outstr.Seek(0L, 0);
buffer = new byte[outstr.Length];
outstr.Read(buffer, 0, buffer.Length);
}
finally
{
if (instr != null)
{
instr.Close();
}
if (outstr != null)
{
outstr.Close();
}
}
return(buffer);
}
public static void Encrypt(StreamCtx ctx, Stream instr, Stream outstr)
{
if (instr.Length > 0L)
{
byte[] inb = new byte[ctx.BlockSize()];
byte[] iv = new byte[ctx.BlockSize()];
bool flag = false;
int i = 0;
while (true)
{
i = instr.Read(inb, 0, ctx.BlockSize());
if (i < 0)
{
i = 0;
}
if ((i > 0) && !flag)
{
flag = true;
if (ctx.Mode == Mode.CBC)
{
Array.Copy(ctx.IV, 0, iv, 0, iv.Length);
}
}
if ((i <= 0) || (i < inb.Length))
{
PrepareLastBuffer(inb, i);
PrepareBuffer(ctx.Mode, inb, iv);
ctx.Ibc.Cipher(inb, iv);
outstr.Write(iv, 0, iv.Length);
break;
}
PrepareBuffer(ctx.Mode, inb, iv);
ctx.Ibc.Cipher(inb, iv);
outstr.Write(iv, 0, iv.Length);
}
outstr.Flush();
}
}
public static void Decrypt(StreamCtx ctx, Stream instr, Stream outstr)
{
if (instr.Length > 0L)
{
byte[] inb = new byte[ctx.BlockSize()];
byte[] outb = new byte[ctx.BlockSize()];
int num = 0;
bool flag = false;
byte[] iv = new byte[ctx.BlockSize()];
bool flag2 = false;
byte[] buffer4 = new byte[ctx.BlockSize()];
while (true)
{
num = instr.Read(inb, 0, inb.Length);
if (num < 0)
{
num = 0;
}
if ((num > 0) && (num != inb.Length))
{
return;
}
if ((num > 0) && !flag)
{
flag = true;
if (ctx.Mode == Mode.CBC)
{
Array.Copy(ctx.IV, 0, iv, 0, ctx.IV.Length);
}
}
if (num <= 0)
{
if (!flag2)
{
return;
}
Array.Copy(buffer4, outb, outb.Length);
int num2 = outb[outb.Length - 1];
if (num2 > outb.Length)
{
return;
}
outstr.Write(outb, 0, outb.Length - num2);
break;
}
ctx.Ibc.InvCipher(inb, outb);
if (ctx.Mode == Mode.CBC)
{
PrepareBuffer(ctx.Mode, outb, iv);
Array.Copy(inb, iv, inb.Length);
}
if (!flag2)
{
Array.Copy(outb, buffer4, outb.Length);
flag2 = true;
}
else
{
outstr.Write(buffer4, 0, buffer4.Length);
Array.Copy(outb, buffer4, outb.Length);
}
}
outstr.Flush();
}
}