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https://github.com/trou/rsbkb

CLI tools: encoders/decoders, CTF and reverse engineering helpers.
https://github.com/trou/rsbkb

base64 cli crc ctf decoding encoding engineering hacking reverse timestamp xor zlib

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CLI tools: encoders/decoders, CTF and reverse engineering helpers.

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README 

        
# rsbkb (Rust blackbag)



## What is it?



`rsbkb` has multiple tools which are designed to be called directly (through

symlinks, like `busybox`). This allows various operations on data to be chained

easily like CyberChef but through pipes.



It also includes various practical tools like `entropy`, a binary `grep`, a

timestamp decoder, etc.



## Quick start



1. install with `cargo install rsbkb` or download the binary from the [releases](https://github.com/trou/rsbkb/releases) page

2. run `rsbkb` to list applets

3. run `rsbkb help ` to learn more

4. optionally create symlinks to call applets directly: `rsbkb symlink`



## Examples



Read 10 bytes from `/etc/passwd` starting at offset `0x2f`, then `xor` with

`0xF2`, encode it in URL-safe base64 and finally URL encode it:



```

$ slice /etc/passwd 0x2f +10 | xor -x f2 | b64 -u | urlenc

l5%2DdnMjdh4GA3Q%3D%3D

```



Various examples:



```

$ unhex 4141:4141

AA:AA

$ echo -n'4141:4141' | unhex

AA:AA

$ crc32 '41 41 41 32'

e60ce752

$ echo -n '41 41 41 32' | crc32

e60ce752

$ echo test | b64 | urlenc

dGVzdAo%3D

$ tsdec 146424672000234122

2065-01-01T00:00:00.0234122Z

$ tsdec 0

1970-01-01T00:00:00Z

$ rsbkb bofpatt 60

Aa0Aa1Aa2Aa3Aa4Aa5Aa6Aa7Aa8Aa9Ab0Ab1Ab2Ab3Ab4Ab5Ab6Ab7Ab8Ab9

$ rsbkb bofpattoff -b 0x41623841

Decoded pattern: Ab8A (big endian: true)

Offset: 54 (mod 20280) / 0x36

$ echo -n tototutu | rsbkb entropy

0.188

$ bgrep -x 454c460201 /bin/ls

0x1

$ bgrep "\x45\x4c..\x01" /bin/ls

0x1

$ findso -p /lib/x86_64-linux-gnu/ -r memcpy /bin/ls

/lib/x86_64-linux-gnu/libc.so.6

$ findso -l /etc/ld.so.conf -a memcpy

/lib/i386-linux-gnu/libc.so.6

[...]

$ base 0x14

20

$ echo "echo 'test'" | escape -t bash-single

'echo '"'"'test'"'"''

```



## How to use



### Build it / Get it



* `cargo build --release`

* `cargo install rsbkb`

* get the binary from the [releases page](https://github.com/trou/rsbkb/releases).

* get the latest artifact from the [Actions](https://github.com/trou/rsbkb/actions) page.



### Usage



* Almost all tools take values as an argument on the command line or if not present, read from `stdin`

* Tool name can be specified on the command line `rsbkb TOOL`

* Or can be called busybox-style: `ln -s rsbkb unhex ; unhex 4142`. Create symlinks with:



```

rsbkb symlink

```



## Included tools



* `hex`: hex encode

* `unhex`: decode hex data (either in the middle of arbitrary data, or strictly)

* `b64`: base64 encode (use `-u` or `--URL` for URL-safe b64)

* `d64`: base64 decode (use `-u` or `--URL` for URL-safe b64)

* `urlenc`: url encode (see `--help` for advanced options)

* `urldec`: url decode

* `xor`: xor (use `-x` to specify the key, in hex, `-f` to specify a file)

* `crc`: all CRC algorithms implemented in the [Crc](https://docs.rs/crc/3.2.1/crc/) crate

* `crc16`: CRC-16

* `crc32`: CRC-32

* `bofpatt` / `boffpattoff`: buffer overflow pattern generator / offset calculator

* `tsdec`: decode various timestamps (Epoch with different resolutions, Windows FILETIME)

* `slice`: take a "slice" of a file (like `dd`) :

 * `slice input_file 10` will output `input_file` from offset 10 on `stdout`

 * `slice input_file 0x10 0x20` will do the same from 0x10 to 0x20 (excluded)

 * `slice input_file 0x10 +0xFF` will copy `0xFF` bytes starting at `0x10`

 * `slice input_file -0x10` will the last 0x10 bytes from `input_file`

* `entropy`: entropy of a file

* `bgrep`: simple binary grep

* `findso`: find which ELF shared library (.so) exports a given name/function

* `inflate` and `deflate`: raw inflate/deflate compression, fault tolerant and with optional Zlib header support

* `base`: easy radix conversion of big integers

* `escape`: backslash-escape special characters in strings (generic, single quote, shell, bash, bash single)

* `unescape`: unescape `\` escaped chars in strings



### Getting help



```console

$ rsbkb help

rsbkb 1.8.0 (Rust BlackBag) - by Raphaël Rigo 



Usage: rsbkb [APPLET]



APPLETS:

  list        list applets

  hex         hex encode

  unhex       hex decode

  urlenc      URL encode

  urldec      URL decode

  crc16       compute CRC-16

  crc32       compute CRC-32

  crc         flexible CRC computation

  b64         base64 encode

  d64         base64 decode

  bofpattoff  buffer overflow pattern offset finder

  bofpatt     buffer overflow pattern generator

  xor         xor value

  entropy     compute file entropy

  slice       cut slices from file or stdin

  bgrep       binary grep

  findso      find which .so implements a given function

  tsdec       timestamp decoder

  deflate     (raw) deflate compression

  inflate     (raw) inflate decompression

  base        convert integer between different bases

  escape      backslash-escape input strings

  unescape    (backslash) unescape input strings

  help        Print this message or the help of the given subcommand(s)



$ rsbkb help slice

cut slices from file or stdin



Usage: rsbkb slice   [end]



Arguments:

     file to slice, - for stdin

    start of slice, relative to end of file if negative

  [end]    end of slice: absolute, relative to  if prefixed with +, relative to end of file if negative

```



## Credits and heritage



This is a Rust reimplementation of some tools found in emonti's

[rbkb](https://github.com/emonti/rbkb), itself a Ruby reimplementation of

Matasano's BlackBag.