public virtual int Write(BufRefLen src)
{
PreWriteCheck(src.Length);
Array.Copy(src.BaseArray, src.BaseArrayOffset, BaseArray, BaseArrayOffset, src.Length);
Seek(src.Length);
src.Seek(src.Length);
return(src.Length);
}
public static BufLen Decrypt(BufLen data, I2PPrivateKey pkey, bool zeropad)
{
if (data == null || (zeropad && data.Length != 514))
{
throw new ArgumentException("ElGamal padded data to decrypt must be exactly 514 bytes!");
}
if (!zeropad && data.Length != 512)
{
throw new ArgumentException("ElGamal data to decrypt must be exactly 512 bytes!");
}
var x = I2PConstants.ElGamalP.Subtract(pkey.ToBigInteger()).Subtract(BigInteger.One);
BigInteger a, b;
var reader = new BufRefLen(data);
if (zeropad)
{
reader.Seek(1);
a = reader.ReadBigInteger(256);
reader.Seek(1);
b = reader.ReadBigInteger(256);
}
else
{
a = reader.ReadBigInteger(256);
b = reader.ReadBigInteger(256);
}
var m2 = b.Multiply(a.ModPow(x, I2PConstants.ElGamalP));
var m1 = m2.Mod(I2PConstants.ElGamalP);
var m = m1.ToByteArray(255);
var hash = I2PHashSHA256.GetHash(m, 33, 222);
if (!BufUtils.Equal(m, 1, hash, 0, 32))
{
throw new HashCheckFailException();
}
return(new BufLen(m, 33, 222));
}
public static byte[] BCGZipDecompress(BufLen buf)
{
var reader = new BufRefLen(buf);
using (var ms = new MemoryStream())
{
// Skip gzip header
var gzheader = reader.ReadBufLen(10);
var flag = gzheader.Peek8(3);
if ((flag & 0x04) != 0)
{
reader.Seek(reader.Read16()); // "Extra"
}
if ((flag & 0x08) != 0)
{
while (reader.Read8() != 0)
{
; // "Name"
}
}
if ((flag & 0x10) != 0)
{
while (reader.Read8() != 0)
{
; // "Comment"
}
}
if ((flag & 0x02) != 0)
{
reader.Read16(); // "CRC16"
}
ms.Write(reader.BaseArray, reader.BaseArrayOffset, reader.Length);
ms.Position = 0;
using (var gzs = new ZInputStream(ms, true))
{
var gzdata = StreamUtils.Read(gzs);
return(gzdata);
}
}
}
public static BufLen BCGZipDecompressNew(BufLen buf)
{
var reader = new BufRefLen(buf);
// Skip gzip header
var gzheader = reader.ReadBufLen(10);
var flag = gzheader.Peek8(3);
if ((flag & 0x04) != 0)
{
reader.Seek(reader.Read16()); // "Extra"
}
if ((flag & 0x08) != 0)
{
while (reader.Read8() != 0)
{
; // "Name"
}
}
if ((flag & 0x10) != 0)
{
while (reader.Read8() != 0)
{
; // "Comment"
}
}
if ((flag & 0x02) != 0)
{
reader.Read16(); // "CRC16"
}
var z = new ZStream();
z.inflateInit(true);
var dest = new byte[buf.Length * 2];
var destix = 0;
z.next_in_index = reader.BaseArrayOffset;
z.next_in = reader.BaseArray;
z.avail_in = reader.Length - 8;
bigger_dest:
z.next_out = dest;
z.next_out_index = destix;
z.avail_out = dest.Length - destix;
var err = z.inflate(JZlib.Z_FINISH);
if (err != JZlib.Z_BUF_ERROR && err != JZlib.Z_OK && err != JZlib.Z_STREAM_END)
{
throw new IOException("inflating: " + z.msg);
}
if (z.avail_out == 0)
{
var newdest = new byte[dest.Length * 2];
Array.Copy(dest, newdest, dest.Length);
destix = dest.Length;
dest = newdest;
goto bigger_dest;
}
var result = new BufLen(dest, 0, dest.Length - z.avail_out);
z.inflateEnd();
return(result);
}