hkdf

Pure Haskell HMAC-based KDF (docs.ppad.tech/hkdf).
git clone git://git.ppad.tech/hkdf.git
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flake.nix (2101B)

      1 {
      2   description = "A pure Haskell HKDF.";
      3 
      4   inputs = {
      5     ppad-nixpkgs = {
      6       type = "git";
      7       url  = "git://git.ppad.tech/nixpkgs.git";
      8       ref  = "master";
      9     };
     10     ppad-sha256 = {
     11       type = "git";
     12       url  = "git://git.ppad.tech/sha256.git";
     13       ref  = "master";
     14       inputs.ppad-nixpkgs.follows = "ppad-nixpkgs";
     15     };
     16     ppad-sha512 = {
     17       type = "git";
     18       url  = "git://git.ppad.tech/sha512.git";
     19       ref  = "master";
     20       inputs.ppad-nixpkgs.follows = "ppad-nixpkgs";
     21     };
     22     flake-utils.follows = "ppad-nixpkgs/flake-utils";
     23     nixpkgs.follows = "ppad-nixpkgs/nixpkgs";
     24   };
     25 
     26   outputs = { self, nixpkgs, flake-utils, ppad-nixpkgs
     27             , ppad-sha256, ppad-sha512 }:
     28     flake-utils.lib.eachDefaultSystem (system:
     29       let
     30         lib = "ppad-hkdf";
     31 
     32         pkgs = import nixpkgs { inherit system; };
     33         hlib = pkgs.haskell.lib;
     34 
     35         sha256 = ppad-sha256.packages.${system}.default;
     36         sha512 = ppad-sha512.packages.${system}.default;
     37 
     38         hpkgs = pkgs.haskell.packages.ghc981.extend (new: old: {
     39           ppad-sha256 = sha256;
     40           ppad-sha512 = sha512;
     41           ${lib} = new.callCabal2nix lib ./. {
     42             ppad-sha256 = new.ppad-sha256;
     43             ppad-sha512 = new.ppad-sha512;
     44           };
     45         });
     46 
     47         cc    = pkgs.stdenv.cc;
     48         ghc   = hpkgs.ghc;
     49         cabal = hpkgs.cabal-install;
     50       in
     51         {
     52           packages.default = hpkgs.${lib};
     53 
     54           devShells.default = hpkgs.shellFor {
     55             packages = p: [
     56               (hlib.doBenchmark p.${lib})
     57             ];
     58 
     59             buildInputs = [
     60               cabal
     61               cc
     62             ];
     63 
     64             inputsFrom = builtins.attrValues self.packages.${system};
     65 
     66             doBenchmark = true;
     67 
     68             shellHook = ''
     69               PS1="[${lib}] \w$ "
     70               echo "entering ${system} shell, using"
     71               echo "cc:    $(${cc}/bin/cc --version)"
     72               echo "ghc:   $(${ghc}/bin/ghc --version)"
     73               echo "cabal: $(${cabal}/bin/cabal --version)"
     74             '';
     75           };
     76         }
     77       );
     78 }
     79