HAL - The Hardware Analyzer

HAL – The Hardware Analyzer

June 29, 2019 Comments Off

HAL is a comprehensive reverse engineering and manipulation framework for gate-level netlists focusing on efficiency, extendability and portability. HAL comes with a fully-fledged plugin system, allowing to introduce arbitrary functionalities to the core.

Apart from multiple research projects, HAL is also used in our university lecture Introduction to Hardware Reverse Engineering.

Features

Natural directed graph representation of netlist elements and their connections
Support for custom gate libraries
High performance thanks to optimized C++ core
Modularity: write your own C++ Plugins for efficient netlist analysis and manipulation (e.g. via graph algorithms)
A feature-rich GUI allowing for visual netlist inspection and interactive analysis
An integrated Python shell to exploratively interact with netlist elements and to interface plugins from the GUI
Update v1.1.0 Support for Xilinx Unisim, Xilinx Simprim, Synopsys 90nm, GSCLIB 3.0 and UMC 0.18µm libraries is now added

API Documentation

The C++ documentation is available here. The Python documentation can be found here.

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Quick Start

Install or build HAL and start the GUI via hal -g. You can list all available options via hal [--help|-h]. We included some example netlists in examples together with the implementation of the respective example gate library in plugins/example_gate_library. For instructions to create your own gate library and other useful tutorials, take a look at the wiki.

Load a library from the examples directory and start exploring the graphical representation. Use the integrated Python shell or the Python script window to interact. Both feature (limited) autocomplete functionality.

Let’s list all lookup tables and print their Boolean functions:

from hal_plugins import libquine_mccluskey

qm_plugin = libquine_mccluskey.quine_mccluskey()

for gate in netlist.get_gates():
    if "LUT" in gate.type:
        print(gate.name + " (id "+str(gate.id) + ", type " + gate.type + ")")
        print("  " + str(len(gate.input_pin_types)) + "-to-" + str(len(gate.output_pin_types)) + " LUT")
        boolean_functions = qm_plugin.get_boolean_function_str(gate, False)
        for pin in boolean_functions:
            print("  " + pin + ": "+boolean_functions[pin])
        print("")

For the example netlist fsm.vhd this prints:

FSM_sequential_STATE_REG_1_i_2_inst (id 5, type LUT6)
  6-to-1 LUT
  O: (~I0 I1 ~I2 I3 I4 ~I5) + (I0 ~I2 I3 I4 I5)

FSM_sequential_STATE_REG_0_i_2_inst (id 3, type LUT6)
  6-to-1 LUT
  O: (I2 I3 I4 ~I5) + (I1 I2) + (I0 I1) + (I1 ~I3) + (I1 ~I4) + (I1 ~I5)

FSM_sequential_STATE_REG_0_i_3_inst (id 4, type LUT6)
  6-to-1 LUT
  O: (~I1 ~I2 I3 ~I4 I5) + (I0 I5) + (I0 I4) + (I0 I3) + (I0 I1) + (I0 ~I2)

OUTPUT_BUF_0_inst_i_1_inst (id 18, type LUT1)
  1-to-1 LUT
  O: (~I0)

OUTPUT_BUF_1_inst_i_1_inst (id 20, type LUT2)
  2-to-1 LUT
  O: (~I0 I1) + (I0 ~I1)

FSM_sequential_STATE_REG_1_i_3_inst (id 6, type LUT6)
  6-to-1 LUT
  O: (I0 I2 I4) + (~I1 I2 I4) + (I0 ~I3 I4) + (~I1 ~I3 I4) + (I0 I4 ~I5) + (~I1 I4 ~I5) + (I2 I5) + (I2 I3) + (I1 I5) + (I1 I3) + (I0 I1) + (~I0 I5) + (~I0 I3) + (~I0 ~I1) + (I1 ~I2) + (~I0 ~I2) + (~I3 I5) + (~I2 ~I3) + (~I4 I5) + (I3 ~I4) + (I1 ~I4)

Citation

If you use HAL in an academic context, please cite the framework using the reference below:

@misc{hal,
    author = {{EmSec Chair for Embedded Security}},
    publisher = {{Ruhr University Bochum}},
    title = {{HAL - The Hardware Analyzer}},
    year = {2019},
    howpublished = {\url{https://github.com/emsec/hal}},
}

Feel free to also include the original paper

@article{2018:Fyrbiak:HAL,
      author    = {Marc Fyrbiak and
                   Sebastian Wallat and
                   Pawel Swierczynski and
                   Max Hoffmann and
                   Sebastian Hoppach and
                   Matthias Wilhelm and
                   Tobias Weidlich and
                   Russell Tessier and
                   Christof Paar},
  title     	= {{HAL-} The Missing Piece of the Puzzle for Hardware Reverse Engineering,
               	  Trojan Detection and Insertion},
  journal	= {IEEE Transactions on Dependable and Secure Computing},
  year		= {2018},
  publisher	= {IEEE},
  howpublished 	= {\url{https://github.com/emsec/hal}}
}