sha256

Pure Haskell SHA-256, HMAC-SHA256 (docs.ppad.tech/sha256).
git clone git://git.ppad.tech/sha256.git
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flake.nix (1837B)

      1 {
      2   description = "Pure Haskell SHA-256 and HMAC-SHA256";
      3 
      4   inputs = {
      5     ppad-nixpkgs = {
      6       type = "git";
      7       url  = "git://git.ppad.tech/nixpkgs.git";
      8       ref  = "master";
      9     };
     10     ppad-base16 = {
     11       type = "git";
     12       url  = "git://git.ppad.tech/base16.git";
     13       ref  = "master";
     14       inputs.ppad-nixpkgs.follows = "ppad-nixpkgs";
     15     };
     16     flake-utils.follows = "ppad-nixpkgs/flake-utils";
     17     nixpkgs.follows = "ppad-nixpkgs/nixpkgs";
     18   };
     19 
     20   outputs = { self, nixpkgs, flake-utils, ppad-nixpkgs
     21             , ppad-base16 }:
     22     flake-utils.lib.eachDefaultSystem (system:
     23       let
     24         lib = "ppad-sha256";
     25 
     26         pkgs = import nixpkgs { inherit system; };
     27         hlib = pkgs.haskell.lib;
     28 
     29         base16 = ppad-base16.packages.${system}.default;
     30 
     31         hpkgs = pkgs.haskell.packages.ghc981.extend (new: old: {
     32           ppad-base16 = base16;
     33           ${lib} = old.callCabal2nixWithOptions lib ./. "--enable-profiling" {
     34             ppad-base16 = new.ppad-base16;
     35           };
     36         });
     37 
     38         cc    = pkgs.stdenv.cc;
     39         ghc   = hpkgs.ghc;
     40         cabal = hpkgs.cabal-install;
     41       in
     42         {
     43           packages.default = hpkgs.${lib};
     44 
     45           devShells.default = hpkgs.shellFor {
     46             packages = p: [
     47               (hlib.doBenchmark p.${lib})
     48             ];
     49 
     50             buildInputs = [
     51               cabal
     52               cc
     53             ];
     54 
     55             inputsFrom = builtins.attrValues self.packages.${system};
     56 
     57             doBenchmark = true;
     58 
     59             shellHook = ''
     60               PS1="[${lib}] \w$ "
     61               echo "entering ${system} shell, using"
     62               echo "cc:    $(${cc}/bin/cc --version)"
     63               echo "ghc:   $(${ghc}/bin/ghc --version)"
     64               echo "cabal: $(${cabal}/bin/cabal --version)"
     65             '';
     66           };
     67         }
     68       );
     69 }
     70