C++14 header-only easy-to-use hash library

What is included in this library:

If you are concerned about security, state-of-the-art performance or whatsoever issue, then take your time and go setup OpenSSL or other proven library

Now some features:

• No/none tweaking knobs, it just works!
  Works out-of-the-box on little endian & big endian machines
• Have similar performance to C implementations: see my rudimentary benchmark: Benchmark.md

• Library only:
  • C++14 compiler
• Tests & driver program:
  • Meson build system
  • Ninja

To use this library in your project:

1. Download this repository and unzip it

2. Use it like:

   // include the header
   #include "pathToLib/sha1.h"
   
   // If you are using C++14 or C++17, don't forget the "gsl" folder!
   
   void example()
   {
     // Get an instance
     Chocobo1::SHA1 sha1;
   
     // Feed data & data length to it
     sha1.addData("hello", 5);
   
     // ... or just
     sha1.addData("hello");
   
     // Tell it to wrap it up
     sha1.finalize();
   
     // Profit! oops, not really...
     std::string result = sha1.toString();
   
     // A one-liner
     std::string result2 = Chocobo1::SHA1().addData("hello").finalize().toString();
   
     // In byte array form
     auto bytes = Chocobo1::SHA1().addData("hello").finalize().toArray();  // std::array<uint8_t, 20>
   
     // Some hash algorithm provides constexpr result under C++17
     constexpr uint8_t data[] = {0x00, 0xFF};
     constexpr auto bytes2 = Chocobo1::SHA1().addData(data).finalize().toArray();
   }

3. There is also a driver program included, you can find it at "src/program"

   1. Compile:

      cd src/program
      meson _builddir  # initialize build folder
      cd _builddir
      ninja            # call the `ninja` to build our program

   2. Run:

      $ ./hash -md5 /path/to/file

cd tests
meson _build
cd _build
ninja
./run_tests

• Microsoft/GSL
  This library is only required when compiling with C++14 and C++17. In C++20 or later, std::span will be used in place of gsl::span.
  No need to download or install it. This repository included a modified version that will compile locally (only for gsl::span related headers).

See LICENSE file

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