..

packages/sodium_libs/android/libsodium/setup.sh

@@ -14,8 +14,13 @@ cleanup() {
 }
 
 validate_checksum() {
-  sha512sum -c "$archive_hash_file"
-  return $?
+  if [ "$(uname)" = "Darwin" ]; then
+    shasum -a512 -c "$archive_hash_file"
+    return $?
+  else
+    sha512sum -c "$archive_hash_file"
+    return $?
+  fi
 }
 
 if [ -f "$archive_file" ]; then

packages/sodium_libs/darwin/libsodium/setup.sh

@@ -0,0 +1,38 @@
+#!/bin/sh
+set -e
+
+cd libsodium
+
+output_dir=../Libraries
+archive_file=libsodium-1.0.20-darwin.tar.xz
+archive_hash_file=$archive_file.sha512
+archive_url_file=$archive_file.url
+archive_url=$(cat "$archive_url_file")
+
+cleanup() {
+  rm -f "$archive_file"
+}
+
+validate_checksum() {
+  shasum -a512 -c "$archive_hash_file"
+  return $?
+}
+
+if [ -f "$archive_file" ]; then
+  if validate_checksum; then
+    exit 0
+  fi
+  cleanup
+fi
+
+# add trap do delete the downloaded file if hash validation or extraction fail
+trap cleanup EXIT
+
+curl -sSLfo "$archive_file" "$archive_url"
+validate_checksum
+
+rm -rf "$output_dir"
+mkdir -p "$output_dir"
+tar -xf "$archive_file" -C "$output_dir"
+
+trap '' EXIT

packages/sodium_libs/darwin/sodium_libs.podspec

@@ -26,6 +26,6 @@ Flutter companion package to sodium that provides the low-level libsodium binari
   s.swift_version = '5.0'
 
   # libsodium
-  s.prepare_command = './download_libsodium.sh'
+  s.prepare_command = 'libsodium/setup.sh'
   s.vendored_frameworks = "Libraries/libsodium.xcframework"
 end

packages/sodium_libs/tool/libsodium/platforms/plugin_targets.dart

@@ -149,7 +149,7 @@ abstract class PluginTargets {
     ),
     PluginTargetGroup(
       'darwin',
-      'Libraries',
+      'libsodium',
       _darwinTargets,
       publish: DarwinTarget.createXcFramework,
       extract: DarwinTarget.createChecksum,