Limit extracted size of DER sequence data

Include signatures for XAR archive format

Update crypto

Add LUKS detection

This adds detection of XAR archive files.

This change limits the size of extracted DER sequences to the size given in the sequence's length field.

Fixed lzmamod.py bug; updated extractor module to include information about which extraction utility was used.

Added ability to toggle binary flags through python kwargs

Fix extra data mistakingly "extracted" from raw Deflate streams

Hi, I think there's a bug here.

Per the [BlockFile docstring](/blob/master/src/binwalk/core/common.py#L256), `read_block()` can return **more** than `dlen` bytes of data, by peeking, and this is intended feature.

However, we don't want the peek'd bytes injected into the stream being decompressed -- as the next `read_block()` call will pull them again!

Take a ~1.5 MiB deflated file to test: `binwalk -X` will extract a slighly larger file than a plain `zlib.decompress(-15)` would. (This, exactly, was how this bug bite me.)

Hope this fix is simple enough to be merged easily! Cheers.

Add Adobe Flash's SWF file (the uncompressed variant)

CSR Bluecore DFU (firmware update) file format

Xilinx FPGA bitstream

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>

Reference: http://wwwimages.adobe.com/content/dam/Adobe/en/devnet/swf/pdf/swf-file-format-spec.pdf Chapter 2 "The SWF header"

Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>