This is a prototype implementation of the Id based Proxy Signature Scheme with Message Recovery as described in the paper.
The implementation is written in c and uses the PBC and Nettle libraries, with the help of some utilities provided by the professor Mario di Raimondo.

• PBC
• gmp
• nettle
• gcc o clang
• [optional] Make
• [optional] Check

The project is structured as follows:

.
├── benchmark # contains the benchmarking scripts
├── bin # contains the executables
├── build # contains the object files
├── include # contains the header files
├── lib # contains the PBC and utility libraries
├── src # contains the source files
└── test # contains the test files

For the full documentation about building, see the Build page.

To build the project, you need to have the PBC library installed. Then, you can build the project by running the following command:

make compile

Once it has been compiled, the project can be run by executing the following command:

./run.sh <params>

After the compilation, an executable will be created in the bin directory.
You can run it directly or use the run.sh script, which will keep checking for changes in the source files and recompile the project if needed.
To see the whole scheme in action, with all its steps, you use the workflow.sh script.

./run.sh <operation> [options]

# Generate the system parameters and store them in the provided file
./run.sh setup -o setup.txt

# Generate the keys associated with the provided identities
./run.sh keygen "$(<setup.txt)" user_id [... user_id] -o keys.txt

# Generate the delegation from 'from_user' to 'to_user' using the private key of 'from_user' in the form [x, y] obtained from the keygen operation
./run.sh delegate "$(<setup.txt)" "[x, y]" from_user to_user -o delegation.bin

# Verifies that the delegation is actually from 'from_user' to 'to_user' by providing the path to the file storing it
./run.sh del_verify "$(<setup.txt)" delegation.bin

# Generate the signature key. It will be used by the delegated user to sign a message on behalf of the delegator
./run.sh pk_gen "$(<setup.txt)" "[x, y]" delegation.bin -o p_sig.txt

# Sign a message on behalf of the delegator
./run.sh p_sign "$(<setup.txt)" delegation.bin "$(<p_sig.txt)" message -o signature.bin

# Verify the signature
./run.sh sign_verify "$(<setup.txt)" delegation.bin signature.bin

The project uses the Check library for unit testing.

To run the tests, you need to have the Check library installed. Then, you can run the tests by executing the following command:

make test

The implementation provided by this project has been benchmarked to evaluate its performance. The full results can be seen in the Benchmark page.

For more information regarding the cryptographic primitives used in this project, please refer to the original papers.
A slightly more in depth explanation can be found in the Paper page.

If you have any questions, please refer to the FAQ page. If you can't find the answer to your question, feel free to open an issue.

• ID-based proxy signature scheme with message recovery
• An Improved ID-based Proxy Signature Scheme with Message Recovery
• PBC
• Nettle
• Mario di Raimondo
• Crypto Engineering
• c-project-template