diff --git a/packages/shorebird_cli/lib/src/commands/patch/android_patcher.dart b/packages/shorebird_cli/lib/src/commands/patch/android_patcher.dart
index a2d76dcc..453994ef 100644
--- a/packages/shorebird_cli/lib/src/commands/patch/android_patcher.dart
+++ b/packages/shorebird_cli/lib/src/commands/patch/android_patcher.dart
@@ -8,6 +8,7 @@ import 'package:shorebird_cli/src/artifact_manager.dart';
 import 'package:shorebird_cli/src/code_push_client_wrapper.dart';
 import 'package:shorebird_cli/src/code_signer.dart';
 import 'package:shorebird_cli/src/commands/patch/patcher.dart';
+import 'package:shorebird_cli/src/common_arguments.dart';
 import 'package:shorebird_cli/src/doctor.dart';
 import 'package:shorebird_cli/src/extensions/arg_results.dart';
 import 'package:shorebird_cli/src/extensions/file.dart';
@@ -36,7 +37,7 @@ class AndroidPatcher extends Patcher {
 
   @override
   Future<void> assertArgsAreValid() async {
-    argResults.file('private-key-path')?.assertExists();
+    argResults.file(CommonArguments.privateKeyArgName)?.assertExists();
   }
 
   @override
@@ -157,7 +158,7 @@ Looked in:
       final patchArtifact = File(patchArtifactPath);
       final hash = sha256.convert(await patchArtifact.readAsBytes()).toString();
 
-      final privateKeyFile = argResults.file('private-key-path');
+      final privateKeyFile = argResults.file(CommonArguments.privateKeyArgName);
       final hashSignature = privateKeyFile != null
           ? codeSigner.sign(
               message: hash,
diff --git a/packages/shorebird_cli/lib/src/commands/patch/ios_patcher.dart b/packages/shorebird_cli/lib/src/commands/patch/ios_patcher.dart
index d8bcb1eb..e1d52750 100644
--- a/packages/shorebird_cli/lib/src/commands/patch/ios_patcher.dart
+++ b/packages/shorebird_cli/lib/src/commands/patch/ios_patcher.dart
@@ -9,9 +9,12 @@ import 'package:shorebird_cli/src/archive_analysis/archive_differ.dart';
 import 'package:shorebird_cli/src/artifact_builder.dart';
 import 'package:shorebird_cli/src/artifact_manager.dart';
 import 'package:shorebird_cli/src/code_push_client_wrapper.dart';
+import 'package:shorebird_cli/src/code_signer.dart';
 import 'package:shorebird_cli/src/commands/patch/patcher.dart';
+import 'package:shorebird_cli/src/common_arguments.dart';
 import 'package:shorebird_cli/src/doctor.dart';
 import 'package:shorebird_cli/src/executables/executables.dart';
+import 'package:shorebird_cli/src/extensions/arg_results.dart';
 import 'package:shorebird_cli/src/logger.dart';
 import 'package:shorebird_cli/src/patch_diff_checker.dart';
 import 'package:shorebird_cli/src/platform.dart';
@@ -210,12 +213,22 @@ class IosPatcher extends Patcher {
     }
 
     final patchFileSize = patchFile.statSync().size;
+    final privateKeyFile = argResults.file(CommonArguments.privateKeyArgName);
+    final hash = sha256.convert(patchBuildFile.readAsBytesSync()).toString();
+    final hashSignature = privateKeyFile != null
+        ? codeSigner.sign(
+            message: hash,
+            privateKeyPemFile: privateKeyFile,
+          )
+        : null;
+
     return {
       Arch.arm64: PatchArtifactBundle(
         arch: 'aarch64',
         path: patchFile.path,
-        hash: sha256.convert(patchBuildFile.readAsBytesSync()).toString(),
+        hash: hash,
         size: patchFileSize,
+        hashSignature: hashSignature,
       ),
     };
   }
diff --git a/packages/shorebird_cli/lib/src/commands/patch/patch_command.dart b/packages/shorebird_cli/lib/src/commands/patch/patch_command.dart
index e274a939..8d6f4f94 100644
--- a/packages/shorebird_cli/lib/src/commands/patch/patch_command.dart
+++ b/packages/shorebird_cli/lib/src/commands/patch/patch_command.dart
@@ -8,6 +8,7 @@ import 'package:shorebird_cli/src/cache.dart';
 import 'package:shorebird_cli/src/code_push_client_wrapper.dart';
 import 'package:shorebird_cli/src/command.dart';
 import 'package:shorebird_cli/src/commands/patch/patch.dart';
+import 'package:shorebird_cli/src/common_arguments.dart';
 import 'package:shorebird_cli/src/config/config.dart';
 import 'package:shorebird_cli/src/deployment_track.dart';
 import 'package:shorebird_cli/src/extensions/arg_results.dart';
@@ -94,7 +95,7 @@ of the iOS app that is using this module.''',
         help: 'Validate but do not upload the patch.',
       )
       ..addOption(
-        'private-key-path',
+        CommonArguments.privateKeyArgName,
         hide: true,
         help: '''
 The path for a private key file that will be used to sign the patch artifact.
diff --git a/packages/shorebird_cli/lib/src/commands/release/release_command.dart b/packages/shorebird_cli/lib/src/commands/release/release_command.dart
index 73c52492..67d21b51 100644
--- a/packages/shorebird_cli/lib/src/commands/release/release_command.dart
+++ b/packages/shorebird_cli/lib/src/commands/release/release_command.dart
@@ -7,6 +7,7 @@ import 'package:shorebird_cli/src/cache.dart';
 import 'package:shorebird_cli/src/code_push_client_wrapper.dart';
 import 'package:shorebird_cli/src/command.dart';
 import 'package:shorebird_cli/src/commands/release/release.dart';
+import 'package:shorebird_cli/src/common_arguments.dart';
 import 'package:shorebird_cli/src/config/config.dart';
 import 'package:shorebird_cli/src/extensions/arg_results.dart';
 import 'package:shorebird_cli/src/logger.dart';
@@ -116,7 +117,7 @@ of the iOS app that is using this module.''',
         allowed: Arch.values.map((arch) => arch.targetPlatformCliArg),
       )
       ..addOption(
-        'public-key-path',
+        CommonArguments.publicKeyArgName,
         hide: true,
         help: '''
 The path for a public key file that will be used to validate patch signatures.
diff --git a/packages/shorebird_cli/lib/src/common_arguments.dart b/packages/shorebird_cli/lib/src/common_arguments.dart
new file mode 100644
index 00000000..15669ca9
--- /dev/null
+++ b/packages/shorebird_cli/lib/src/common_arguments.dart
@@ -0,0 +1,6 @@
+/// A class that houses the name of arguments that are shared between different
+/// commands and layers.
+class CommonArguments {
+  static const String publicKeyArgName = 'public-key-path';
+  static const String privateKeyArgName = 'private-key-path';
+}
diff --git a/packages/shorebird_cli/lib/src/extensions/arg_results.dart b/packages/shorebird_cli/lib/src/extensions/arg_results.dart
index 2a689f31..1fe6a22a 100644
--- a/packages/shorebird_cli/lib/src/extensions/arg_results.dart
+++ b/packages/shorebird_cli/lib/src/extensions/arg_results.dart
@@ -3,6 +3,7 @@ import 'dart:io';
 
 import 'package:args/args.dart';
 import 'package:collection/collection.dart';
+import 'package:shorebird_cli/src/common_arguments.dart';
 import 'package:shorebird_cli/src/extensions/file.dart';
 
 extension OptionFinder on ArgResults {
@@ -44,18 +45,16 @@ extension OptionFinder on ArgResults {
   }
 }
 
-const _publicKeyArgName = 'public-key-path';
-
 extension CodeSign on ArgResults {
   /// Asserts that either there is no public key argument
   /// or that the path received exists.
   void assertAbsentOrValidPublicKey() {
-    file(_publicKeyArgName)?.assertExists();
+    file(CommonArguments.publicKeyArgName)?.assertExists();
   }
 
   /// Read the public key file and encode it to base64 if any.
   String? get encodedPublicKey {
-    final publicKeyFile = file(_publicKeyArgName);
+    final publicKeyFile = file(CommonArguments.publicKeyArgName);
 
     return publicKeyFile != null
         ? base64Encode(publicKeyFile.readAsBytesSync())
diff --git a/packages/shorebird_cli/test/src/commands/patch/android_patcher_test.dart b/packages/shorebird_cli/test/src/commands/patch/android_patcher_test.dart
index 384af69b..f08a9ea0 100644
--- a/packages/shorebird_cli/test/src/commands/patch/android_patcher_test.dart
+++ b/packages/shorebird_cli/test/src/commands/patch/android_patcher_test.dart
@@ -11,6 +11,7 @@ import 'package:shorebird_cli/src/artifact_manager.dart';
 import 'package:shorebird_cli/src/code_push_client_wrapper.dart';
 import 'package:shorebird_cli/src/code_signer.dart';
 import 'package:shorebird_cli/src/commands/patch/patch.dart';
+import 'package:shorebird_cli/src/common_arguments.dart';
 import 'package:shorebird_cli/src/doctor.dart';
 import 'package:shorebird_cli/src/engine_config.dart';
 import 'package:shorebird_cli/src/logger.dart';
@@ -466,7 +467,7 @@ Looked in:
               ),
             )..createSync();
 
-            when(() => argResults['private-key-path'])
+            when(() => argResults[CommonArguments.privateKeyArgName])
                 .thenReturn(privateKey.path);
 
             when(
diff --git a/packages/shorebird_cli/test/src/commands/patch/ios_patcher_test.dart b/packages/shorebird_cli/test/src/commands/patch/ios_patcher_test.dart
index 4d1ea937..77776f17 100644
--- a/packages/shorebird_cli/test/src/commands/patch/ios_patcher_test.dart
+++ b/packages/shorebird_cli/test/src/commands/patch/ios_patcher_test.dart
@@ -8,7 +8,9 @@ import 'package:shorebird_cli/src/archive_analysis/archive_analysis.dart';
 import 'package:shorebird_cli/src/artifact_builder.dart';
 import 'package:shorebird_cli/src/artifact_manager.dart';
 import 'package:shorebird_cli/src/code_push_client_wrapper.dart';
+import 'package:shorebird_cli/src/code_signer.dart';
 import 'package:shorebird_cli/src/commands/patch/patch.dart';
+import 'package:shorebird_cli/src/common_arguments.dart';
 import 'package:shorebird_cli/src/doctor.dart';
 import 'package:shorebird_cli/src/engine_config.dart';
 import 'package:shorebird_cli/src/executables/aot_tools.dart';
@@ -43,6 +45,7 @@ void main() {
       late ArtifactBuilder artifactBuilder;
       late ArtifactManager artifactManager;
       late CodePushClientWrapper codePushClientWrapper;
+      late CodeSigner codeSigner;
       late Doctor doctor;
       late EngineConfig engineConfig;
       late Directory flutterDirectory;
@@ -69,6 +72,7 @@ void main() {
             artifactBuilderRef.overrideWith(() => artifactBuilder),
             artifactManagerRef.overrideWith(() => artifactManager),
             codePushClientWrapperRef.overrideWith(() => codePushClientWrapper),
+            codeSignerRef.overrideWith(() => codeSigner),
             doctorRef.overrideWith(() => doctor),
             engineConfigRef.overrideWith(() => engineConfig),
             iosRef.overrideWith(() => ios),
@@ -102,6 +106,7 @@ void main() {
         artifactBuilder = MockArtifactBuilder();
         artifactManager = MockArtifactManager();
         codePushClientWrapper = MockCodePushClientWrapper();
+        codeSigner = MockCodeSigner();
         doctor = MockDoctor();
         engineConfig = MockEngineConfig();
         ios = MockIos();
@@ -935,6 +940,56 @@ void main() {
                   ).called(1);
                 });
               });
+
+              group('when a private key is provided', () {
+                setUp(() {
+                  final privateKey = File(
+                    p.join(
+                      Directory.systemTemp.createTempSync().path,
+                      'test-private.pem',
+                    ),
+                  )..createSync();
+
+                  when(() => argResults[CommonArguments.privateKeyArgName])
+                      .thenReturn(privateKey.path);
+
+                  when(
+                    () => codeSigner.sign(
+                      message: any(named: 'message'),
+                      privateKeyPemFile: any(named: 'privateKeyPemFile'),
+                    ),
+                  ).thenAnswer((invocation) {
+                    final message =
+                        invocation.namedArguments[#message] as String;
+                    return '$message-signature';
+                  });
+                });
+
+                test(
+                    '''returns patch artifact bundles with proper hash signatures''',
+                    () async {
+                  final result = await runWithOverrides(
+                    () => patcher.createPatchArtifacts(
+                      appId: appId,
+                      releaseId: releaseId,
+                      releaseArtifact: releaseArtifactFile,
+                    ),
+                  );
+
+                  // Hash the patch artifacts and append '-signature' to get the
+                  // expected signatures, per the mock of [codeSigner.sign]
+                  // above.
+                  const expectedSignature =
+                      '''e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855-signature''';
+
+                  expect(
+                    result.values.first.hashSignature,
+                    equals(
+                      expectedSignature,
+                    ),
+                  );
+                });
+              });
             });
           });
 
diff --git a/packages/shorebird_cli/test/src/commands/release/android_releaser_test.dart b/packages/shorebird_cli/test/src/commands/release/android_releaser_test.dart
index b39149f7..e0a0ccdc 100644
--- a/packages/shorebird_cli/test/src/commands/release/android_releaser_test.dart
+++ b/packages/shorebird_cli/test/src/commands/release/android_releaser_test.dart
@@ -10,6 +10,7 @@ import 'package:shorebird_cli/src/artifact_builder.dart';
 import 'package:shorebird_cli/src/code_push_client_wrapper.dart';
 import 'package:shorebird_cli/src/code_signer.dart';
 import 'package:shorebird_cli/src/commands/release/android_releaser.dart';
+import 'package:shorebird_cli/src/common_arguments.dart';
 import 'package:shorebird_cli/src/doctor.dart';
 import 'package:shorebird_cli/src/engine_config.dart';
 import 'package:shorebird_cli/src/logger.dart';
@@ -228,7 +229,7 @@ void main() {
               'public-key.der',
             ),
           )..writeAsStringSync('public key');
-          when(() => argResults['public-key-path'])
+          when(() => argResults[CommonArguments.publicKeyArgName])
               .thenReturn(publicKeyFile.path);
         });
 
@@ -243,7 +244,7 @@ void main() {
       group('when a public key is provided but it does not exists', () {
         setUp(() {
           when(() => argResults['artifact']).thenReturn('apk');
-          when(() => argResults['public-key-path'])
+          when(() => argResults[CommonArguments.publicKeyArgName])
               .thenReturn('non-existing-key.der');
         });
 
@@ -435,7 +436,7 @@ void main() {
               'patch-signing-public-key.der',
             ),
           )..writeAsStringSync('public key');
-          when(() => argResults['public-key-path'])
+          when(() => argResults[CommonArguments.publicKeyArgName])
               .thenReturn(patchSigningPublicKeyFile.path);
 
           when(
diff --git a/packages/shorebird_cli/test/src/commands/release/ios_releaser_test.dart b/packages/shorebird_cli/test/src/commands/release/ios_releaser_test.dart
index 05037fa9..95c157e2 100644
--- a/packages/shorebird_cli/test/src/commands/release/ios_releaser_test.dart
+++ b/packages/shorebird_cli/test/src/commands/release/ios_releaser_test.dart
@@ -10,6 +10,7 @@ import 'package:shorebird_cli/src/artifact_builder.dart';
 import 'package:shorebird_cli/src/artifact_manager.dart';
 import 'package:shorebird_cli/src/code_push_client_wrapper.dart';
 import 'package:shorebird_cli/src/commands/release/ios_releaser.dart';
+import 'package:shorebird_cli/src/common_arguments.dart';
 import 'package:shorebird_cli/src/doctor.dart';
 import 'package:shorebird_cli/src/executables/xcodebuild.dart';
 import 'package:shorebird_cli/src/logger.dart';
@@ -254,7 +255,7 @@ void main() {
                 'public-key.der',
               ),
             )..writeAsStringSync('public key');
-            when(() => argResults['public-key-path'])
+            when(() => argResults[CommonArguments.publicKeyArgName])
                 .thenReturn(publicKeyFile.path);
           });
 
@@ -268,7 +269,7 @@ void main() {
 
         group('when the provided public key is a nonexistent file', () {
           setUp(() {
-            when(() => argResults['public-key-path'])
+            when(() => argResults[CommonArguments.publicKeyArgName])
                 .thenReturn('non-existing-key.der');
           });
 
@@ -331,7 +332,7 @@ void main() {
                 'patch-signing-public-key.der',
               ),
             )..writeAsStringSync('public key');
-            when(() => argResults['public-key-path'])
+            when(() => argResults[CommonArguments.publicKeyArgName])
                 .thenReturn(patchSigningPublicKeyFile.path);
 
             when(
diff --git a/packages/shorebird_cli/test/src/commands/release/release_command_test.dart b/packages/shorebird_cli/test/src/commands/release/release_command_test.dart
index 30226cad..5f351998 100644
--- a/packages/shorebird_cli/test/src/commands/release/release_command_test.dart
+++ b/packages/shorebird_cli/test/src/commands/release/release_command_test.dart
@@ -6,6 +6,7 @@ import 'package:scoped_deps/scoped_deps.dart';
 import 'package:shorebird_cli/src/cache.dart';
 import 'package:shorebird_cli/src/code_push_client_wrapper.dart';
 import 'package:shorebird_cli/src/commands/release/release.dart';
+import 'package:shorebird_cli/src/common_arguments.dart';
 import 'package:shorebird_cli/src/config/config.dart';
 import 'package:shorebird_cli/src/logger.dart';
 import 'package:shorebird_cli/src/release_type.dart';
@@ -500,7 +501,8 @@ $exception''',
               keyName,
             ),
           )..writeAsStringSync('KEY');
-          when(() => argResults['public-key-path']).thenReturn(file.path);
+          when(() => argResults[CommonArguments.publicKeyArgName])
+              .thenReturn(file.path);
         });
 
         test('completes successfully', () async {