ECC_cpabe_revocation

Steps to Installation(UNIX):

1. Clone the repository.
2. cd into the cloned directory.
3. Run the command:
   1. chmod 744 check.sh
   2. chmod 744 compile.sh
4. Run ./check.sh in terminal(sudo password will be asked).
5. Add the following command to the end of Makefile in cpabe and libswabe folder: new: clean $(MAKE) (Add this line after a tab)

To make changes:

1. Make a new branch with your name as firstname_lastname using the command : git branch <your_name>
2. Change to that branch using the command: git checkout <your_name>
3. Alternatively to above 2 commands, use : git checkout -b <your_name>. This command will bring you to this branch after creating it.
4. Make the desired changes and add + commit + push the changes.
5. Make a pull request to the master branch of the repo.
6. Do not merge the pull request. Wait for all others to check your code.
7. Check your current branch using : git branch. The branch with * mark is the current directory. Use : git checkout master to goto master branch.
8. Once your code is merged, you can delete your branch using the command: git branch -d <your_name>.
9. git pull to bring all the new changes in the master branch to your local.
10. To make more changes, goto step 1.

Reference: working with git branches

Steps to Compile (all at once):

1. Run ./compile.sh

Steps to Compile(individual files):

1. If any changes are made to files in libswabe folder:

   1. Goto libswabe directory using terminal
   2. Run : make new
   3. Run : sudo make install

2. setup.c

   1. Goto cpabe folder using terminal
   2. Run the command: gcc -o setupdemo setup.c common.c -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pbc -I/usr/local/include/pbc -lglib-2.0 -Wl,-rpath /usr/local/lib -lgmp -Wl,-rpath /usr/local/lib -lpbc -lbswabe -lcrypto -lcrypto -lgmp -w
   3. If no error, setupdemo executable file is created.
   4. ./setupdemo
   5. Enter number of attributes in the attribute universe, defined as 'n' in the research paper.
   6. Files "pub_key" and "master_key" will be created, to be used in next steps.

3. keygen.c

   1. Goto cpabe folder using Terminal
   2. Run the command: gcc -o keygendemo keygen.c common.c policy_lang.c -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pbc -I/usr/local/include/pbc -lglib-2.0 -Wl,-rpath /usr/local/lib -lgmp -Wl,-rpath /usr/local/lib -lpbc -lbswabe -lcrypto -lcrypto -lgmp -w
   3. If no error, keygendemo executable file is created.
   4. Run ./keygendemo pub_key master_key [Attrs..] where n is number of attributes entered in setup program while [Attrs.. ] represents list of attributes in binary separated by space. Eg. If n=4 then a sample attribute list will be 1 0 0 1 .
   5. File named "priv_key" will be created unless "-o" option is used in step 4 in which case, the mentioned name will be the output file.

4. enc.c

   1. Run the command: gcc -o encdemo enc.c common.c policy_lang.c -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pbc -I/usr/local/include/pbc -O3 -Wall -lglib-2.0 -Wl,-rpath /usr/local/lib -lgmp -Wl,-rpath /usr/local/lib -lpbc -lbswabe -lcrypto -lcrypto -lgmp -w
   2. If no error, encdemo executable file is created.
   3. Before running this file, create/bring a sample file that needs to be encrypted, say trial.txt
   4. Run ./encdemo pub_key trial.txt 1 0 1 1 , where pub_key is name of public key file generated in setup phase, and 1 0 1 1 is a sample policy corresponding to n=4 (specified in keygen step), which will be used in encrypting the doc.
   5. File named "trial.txt.cpabe" will replace the originally existing file containing the encrypted unreadable text.

5. dec.c

   1. Run the command: gcc -o decdemo dec.c common.c -I/usr/include/glib-2.0 -I/usr/lib/x86_64-linux-gnu/glib-2.0/include -I/usr/include/pbc -I/usr/local/include/pbc -O3 -Wall -lglib-2.0 -Wl,-rpath /usr/local/lib -lgmp -Wl,-rpath /usr/local/lib -lpbc -lbswabe -lcrypto -lcrypto -lgmp -w
   2. If no error, decdemo executable file is created.
   3. Ensure that the previously encrypted file is available in the present directory.
   4. Run ./decdemo pub_key priv_key trial.txt.cpabe
   5. If the user's ID is available on the server and is not revoked from access, then decryption will pass and "trial.txt" will be produced, otherwise decryption will fail.

Additional Files:

1. demo.c : Extra file to try and test code bits before putting them into main files.
2. ecc.c : openSSL way of defining a curve, doing point addition, double and multiplication. For reference. (requires openSSL to be installed in the system)