build: add libsodium support

build.zig

@@ -4,6 +4,7 @@ pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
     const optimize = b.standardOptimizeOption(.{});
 
+    const enable_libsodium = b.option(bool, "enable-libsodium", "Build with libsodium for higher-performance signing (default: true)") orelse true;
     const enable_tls = b.option(bool, "enable-tls", "Build TLS support (default: true)") orelse true;
     const tls_verify = b.option(bool, "force-host-verify", "Force hostname verification for TLS connections (default: true)") orelse true;
     const enable_streaming = b.option(bool, "enable-streaming", "Build with streaming support (default: true)") orelse true;
@@ -17,6 +18,15 @@ pub fn build(b: *std.Build) void {
         "protobuf_c",
         .{ .target = target, .optimize = optimize },
     ) else null;
+    const libsodium_dep = if (enable_libsodium) b.lazyDependency(
+        "libsodium",
+        .{
+            .target = target,
+            .optimize = optimize,
+            .static = true,
+            .shared = false,
+        },
+    ) else null;
 
     const lib = b.addStaticLibrary(.{
         .name = "nats",
@@ -100,6 +110,12 @@ pub fn build(b: *std.Build) void {
         lib.linkLibrary(dep.artifact("protobuf_c"));
     }
 
+    if (libsodium_dep) |dep| {
+        lib.defineCMacro("NATS_USE_LIBSODIUM", null);
+        // yep
+        lib.linkLibrary(dep.artifact(if (tinfo.isMinGW()) "libsodium-static" else "sodium"));
+    }
+
     b.installArtifact(lib);
 }
 

build.zig.zon

@@ -17,6 +17,11 @@
             .hash = "1220f454bf9412333c5d21b8c21b323fc7e4e37b02341bf2fa49f110b8bc5d97c972",
             .lazy = true,
         },
+        .libsodium = .{
+            .url = "git+https://github.com/jedisct1/libsodium.git?ref=1.0.20-RELEASE#9511c982fb1d046470a8b42aa36556cdb7da15de",
+            .hash = "1220d265dc673167ffe4a3cefe2840893d2910cfd773cfb1893ff768d5f1351d2a1f",
+            .lazy = true,
+        },
     },
     .paths = .{
         "build.zig",

readme.md

@@ -29,6 +29,7 @@ You can then import `nats_c` in your `build.zig` with:
 const nats_c_dep = b.dependency("nats_c", .{
     .target = target,
     .optimize = optimize,
+    .@"enable-libsodium" = true, // Use libsodium for optimized implementations of some signing routines
     .@"enable-tls" = true, // enable SSL/TLS support
     .@"force-host-verify" = true, // force hostname verification for TLS connections
     .@"enable-streaming" = true, // build with support for NATS streaming extensions
@@ -38,10 +39,11 @@ your_exe.linkLibrary(nats_c_dep.artifact("nats_c"));
 
 ## Dependencies
 
-The NATS.c library has two optional dependencies:
+The NATS.c library has optional dependencies:
 
 - [`libressl`][libressl] when building with `enable-tls`
 - [`protobuf-c`][protobuf-c] when building with `enable-streaming`
+- [`libsodium`][libsodium] when building with `enable-libsodium`
 
 These dependencies are currently automatically retrieved and compiled as static libraries by the Zig build system.
 
@@ -54,4 +56,5 @@ These dependencies are currently automatically retrieved and compiled as static
 [nats.c]: https://github.com/nats-io/nats.c
 [libressl]: https://github.com/allyourcodebase/libressl
 [protobuf-c]: https://github.com/allyourcodebase/protobuf-c
+[libsodium]: https://github.com/jedisct1/libsodium
 [epicyclic-dev-bindings]: https://github.com/epicyclic-dev/nats-client