C implementation of the PRESENT Block Cipher.

• Introduction
• How to Use
• Examples
• Configuration
• License
• See Also

PRESENT is a lightweight block cipher algorithm designed in 2007 by Andrey Bogdanov, Lars R. Knudsen, Gregor Leander, Christof Paar, Axel Poschmann, Matthew J. B. Robshaw, Yannick Seurin, and C. Vikkelsoe.

The project was designed mainly for embedded systems but it is suitable to use in any platform.

The module could be used by either adding source files directly to the project, or compiling as a static library via pre-included build system.

To build the module as a static library, TYPE tag in the Config.mk file must be chosen as SLIB. Additional source files could be added. The build system detects and adds those file directly to the source tree.

Object files(and assembly files if the ASM_GEN flag is set) and out file are placed to bin folder.

By default, the project has a test main file under the test folder. To adding custom main function, the test_main.c file must be excluded from the source tree.

To build the project, at the project root folder, run:

$ make

By default, make command compile files only when something changes in the source code. To build whole project in any case, run:

$ make rebuild

To remove all generated files, run:

$ make clean

The project has a test code which could be found under test folder. The code demonstrates encrypt and decrypt operations with text blocks and keys given in appendix I of the article.

Test outputs are placed to bin/test folder. Results could be seen by running test out files.

To build test files, run:

$ make

Project configurations grouped under two category; module configurations and build configurations. If the module is not compiled as static library, build configurations are negligible.

Module configurations are found under conf.h file. All options related with modules are documented in that file.

Build configurations are found under Config.mk file. All options related with build system are documented in that file.

Additionally, tools used to build project could be configured via Tools.mk file and build rules could be configured via Rules.mk file.

NOTE: Every compiler has different features and flags. Therefore, Tools.mk and Rules.mk files may have to be rewritten.

This project is licensed under the MIT License - see the LICENSE file for details.

• PRESENT: An Ultra-Lightweight Block Cipher