add PoC base64 functions

flake.nix

@@ -34,6 +34,7 @@
         nixpkgs.legacyPackages.${system}.nixpkgs-fmt);
 
       lib = {
+        base64 = import lib/base64.nix;
         gen-ssh-config = import lib/gen-ssh-config.nix lib;
         ssh-keys = import lib/ssh-keys.nix;
 

lib/base64.nix

@@ -0,0 +1,15 @@
+{ runCommand }: {
+
+  b64decode = input:
+    builtins.readFile
+      (runCommand "b64decode" { } ''
+        base64 -d >$out <${builtins.toFile "input" input}
+      '');
+
+  b64encode = input:
+    builtins.readFile
+      (runCommand "b64encode" { } ''
+        base64 -w0 >$out <${builtins.toFile "input" input}
+      '');
+
+}