pencode - complex payload encoder

Pencode is a tool that helps you to create payload encoding chains. It has been designed to be used in automation whereever it is required to apply multiple encodings to a payload (and possibly inserting the payload to a template in between).

pencode can be used as a standalone command line tool or as a library for other Go programs.

Installation

go install github.com/ffuf/pencode/cmd/pencode@latest

Usage

pencode - complex payload encoder v0.4

Usage: ./pencode FUNC1 FUNC2 FUNC3...

./pencode reads input from stdin by default, which is typically piped from another process.

OPTIONS:
-input reads input from a file, line by line.

ENCODERS
  b64encode         - Base64 encoder
  hexencode         - Hex string encoder
  htmlescape        - HTML escape
  jsonescape        - JSON escape
  unicodeencodeall  - Unicode escape string encode (all characters)
  urlencode         - URL encode reserved characters
  urlencodeall      - URL encode all characters
  utf16             - UTF-16 encoder (Little Endian)
  utf16be           - UTF-16 encoder (Big Endian)
  xmlescape         - XML escape

DECODERS
  b64decode         - Base64 decoder
  hexdecode         - Hex string decoder
  htmlunescape      - HTML unescape
  jsonunescape      - JSON unescape
  unicodedecode     - Unicode escape string decode
  urldecode         - URL decode
  xmlunescape       - XML unescape

HASHES
  md5               - MD5 sum
  sha1              - SHA1 checksum
  sha224            - SHA224 checksum
  sha256            - SHA256 checksum
  sha384            - SHA384 checksum
  sha512            - SHA512 checksum

OTHER
  filename.tmpl     - Replaces string #PAYLOAD# in content of a file that has .tmpl extension.
  lower             - Convert string to lowercase
  upper             - Convert string to uppercase

To urlencode, base64encode and hex encode a string:

$ echo 'what%ever'|pencode urlencode b64encode hexencode
64326868644355794e5756325a58493d

Templating

Any command line parameter that is a file path ending with .tmpl is considered as a template file by pencode. It attempts to read the file content and to replace instances of a string #PAYLOAD# within the file with the input in the current encoder chain.

Shell completion

Pencode can provide tab completion for available encoders. Bash, Zsh, and Fish are supported.

$ pencode <TAB>
b64decode         hexdecode         unicodedecode     urldecode         urlencodeall      utf16be
...

In order to activate shell completion, you need to inform your shell that completion is available for your script.

Bash

To get auto-complete working you need to source the pencode-completion.bash file in your ~/.bashrc or similar:

source ~/path/to/pencode-completion.bash

Zsh

To get auto-complete working you need to enable autocomplete (not needed if you have Oh-My-Zsh) using autoload -U compaudit && compinit or by putting it into ~/.zshrc

Then source the pencode-completion.zsh file in your .zshrc or similar:

source ~/path/to/pencode-completion.zsh

Fish

To get auto-complete working you need to source the pencode-completion.fish file to your config folder ~/.config/fish/completions/pencode.fish or similar:

source ~/path/to/pencode-completion.fish

Usage as a library

package main

import (
    "fmt"
    
    "github.com/ffuf/pencode/pkg/pencode"
)

func main() {
    inputdata := "Whatever you wish to run through the chain"
    # A slice of encoders in the preferred encoding chain execution order
    encoders := []string{
        "utf16",
        "b64encode",
    }
    chain := pencode.NewChain()
    err := chain.Initialize(encoders)
    if err != nil {
        panic(err)
    }
    output, err := chain.Encode([]byte(inputdata))
    if err != nil {
        panic(err)
    }
    fmt.Print(string(output))
}

License

pencode is released under MIT license. See LICENSE.