srisum: init at 5.0.0

this is a small utility in the shape of shasum to generate subresource
integrity hashes on the command line.

pkgs/tools/misc/srisum/default.nix

@@ -0,0 +1,29 @@
+{ lib
+, stdenv
+, rustPlatform
+, fetchFromGitHub
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "srisum";
+  version = "5.0.0";
+
+  src = fetchFromGitHub {
+    owner = "zkat";
+    repo = "srisum-rs";
+    rev = "v${version}";
+    hash = "sha256-Nw3uTGOcz1ivAm9X+PnOdNA937wuK3vtJQ0iJHlHVdw=";
+  };
+  cargoHash = "sha256-q6FGykY+HmU3/jMaGRO36OlYGVLG9mU8yZ8j/Shux3s=";
+
+  doInstallCheck = true;
+
+  meta = with lib; {
+    description = "A command-line utility to compute and check subresource integrity hashes";
+    homepage = "https://github.com/zkat/srisum-rs";
+    changelog = "https://github.com/zkat/srisum-rs/raw/v${version}/CHANGELOG.md";
+    license = with licenses; [ asl20 ];
+    maintainers = with maintainers; [ pjjw ];
+    platforms = platforms.all;
+  };
+}

pkgs/top-level/all-packages.nix

@@ -28588,6 +28588,8 @@ with pkgs;
 
   skopeo = callPackage ../development/tools/skopeo { };
 
+  srisum = callPackage ../tools/misc/srisum { };
+
   smem = callPackage ../os-specific/linux/smem { };
 
   smimesign = callPackage ../os-specific/darwin/smimesign { };