Use ssh-keygen to generate the ssh keys

At some point I'll figure out how to do this with Dart only code, but
till then lets just call the process.

GitJournal can also no longer run in a sandbox as it needs to access the
ssh-keygen executable.

lib/ssh/keygen.dart

@@ -25,10 +25,11 @@ class SshKey {
 final bool useDartKeyGen = false;
 
 Future<SshKey?> generateSSHKeys({required String comment}) async {
-  if (useDartKeyGen) {
-    //return generateSSHKeysDart(comment: comment);
-  } else {}
-  return generateSSHKeysNative(comment: comment);
+  if (Platform.isAndroid || Platform.isIOS) {
+    return generateSSHKeysNative(comment: comment);
+  } else {
+    return generateSSHKeysKeygen(comment: comment);
+  }
 }
 
 /*
@@ -80,6 +81,37 @@ Future<SshKey?> generateSSHKeysNative({required String comment}) async {
   return null;
 }
 
+Future<SshKey?> generateSSHKeysKeygen({required String comment}) async {
+  var privateFile = p.join(Directory.systemTemp.path, 'id_rsa');
+
+  // ssh-keygen -f /tmp/r -t rsa -b 4096 -q -N "" -C 'happy'
+  var process = await Process.start('ssh-keygen', [
+    '-f',
+    privateFile,
+    '-t',
+    'rsa',
+    '-b',
+    '4096',
+    '-q',
+    '-N',
+    '',
+    '-C',
+    comment,
+  ]);
+
+  var exitCode = await process.exitCode;
+  if (exitCode != 0) {
+    // FIXME: Give me an error!
+    return null;
+  }
+
+  return SshKey(
+    publicKey: await File(privateFile + '.pub').readAsString(),
+    privateKey: await File(privateFile).readAsString(),
+    password: "",
+  );
+}
+
 Future<SshKey> generateSSHEccKeys({required String comment}) async {
   print("Generating KeyPair ...");
   var stopwatch = Stopwatch()..start();

macos/Runner/DebugProfile.entitlements

@@ -3,7 +3,7 @@
 <plist version="1.0">
 <dict>
 	<key>com.apple.security.app-sandbox</key>
-	<true/>
+	<false/>
 	<key>com.apple.security.cs.allow-jit</key>
 	<true/>
 	<key>com.apple.security.network.server</key>

macos/Runner/Release.entitlements

@@ -3,6 +3,6 @@
 <plist version="1.0">
 <dict>
 	<key>com.apple.security.app-sandbox</key>
-	<true/>
+	<false/>
 </dict>
 </plist>