Blowfish is a symmetric block cipher that can be used as a drop-in replacement for DES or IDEA. It takes a variable-length key, from 32 bits to 448 bits, making it ideal for both domestic and exportable use. Blowfish was designed in 1993 by Bruce Schneier as a fast, free alternative to existing encryption algorithms. Since then it has been analyzed considerably, and it is slowly gaining acceptance as a strong encryption algorithm. Blowfish is unpatented and license-free, and is available free for all uses.
Blowfish 2 was released in 2005. It has exactly the same design but has twice as many S tables and uses 64-bit integers instead of 32-bit integers. It no longer works on 64-bit blocks but on 128-bit blocks like AES. 128-bit block, 64 rounds, key up to 4224 bits.
This is a C++ implementation of the encryption algorithm.
- You may fork it and use it like any other source file in your project. You only need blowfish.hpp and blowfish.cpp files. Just modify the header as per your convienence.
- If you are using CMake, the work is lot easier. You can add this as a git submodule. It isolates your project from this dependency.
# In your project root type these commands
git submodule add https://github.com/avinal/blowfish
# considering this addition is your only change
git commit -m "blowfish submodule added"
git push origin mainAdd this to your CMakeLists.txt as well.