Experiment: Try to generate ECC keys in Dart

I'm stuck at how to convert them between two formats.

lib/ssh/keygen.dart

@@ -1,5 +1,6 @@
 import 'dart:io';
 
+import 'package:basic_utils/basic_utils.dart';
 import 'package:git_bindings/git_bindings.dart' as gb;
 import 'package:path/path.dart' as p;
 
@@ -76,3 +77,22 @@ Future<SshKey?> generateSSHKeysNative({required String comment}) async {
 
   return null;
 }
+
+Future<SshKey> generateSSHEccKeys({required String comment}) async {
+  print("Generating KeyPair ...");
+  var stopwatch = Stopwatch()..start();
+  var keyPair = CryptoUtils.generateEcKeyPair(curve: 'secp384r1');
+  var publicKey = keyPair.publicKey as ECPublicKey;
+  var privateKey = keyPair.privateKey as ECPrivateKey;
+  print("Generating KeyPair took: ${stopwatch.elapsed}");
+
+  var publicPem = CryptoUtils.encodeEcPublicKeyToPem(publicKey);
+  var privatePem = CryptoUtils.encodeEcPrivateKeyToPem(privateKey);
+
+  // FIXME: I need to learn to convert from the public key PEM format to ecdsa-sha2-nistp384
+  return SshKey(
+    publicKey: publicPem,
+    privateKey: privatePem,
+    password: "",
+  );
+}

lib/ssh/main_keygen.dart-exp

@@ -55,3 +55,27 @@ String privateKeyString() {
 // -> https://golang.org/src/crypto/x509/pkcs8.go
 
 // Key format is PKCS8 or OpenSSH.
+
+/*
+String publicKeyString(ECPublicKey publicKey, String comment) {
+  var publicPem = CryptoUtils.encodeEcPublicKeyToPem(publicKey);
+
+  print('public PEM');
+  print(publicPem);
+  print('\n');
+
+  var publicKeyBytes = CryptoUtils.getBytesFromPEMString(publicPem);
+  var data = BinaryLengthValue.encode([
+    BinaryLengthValue.fromString("ecdsa-sha2-nistp384"),
+    BinaryLengthValue(publicKeyBytes),
+  ]);
+
+  if (comment.isNotEmpty) {
+    comment = comment.replaceAll('\r', ' ');
+    comment = comment.replaceAll('\n', ' ');
+    comment = ' $comment';
+  }
+
+  return 'ecdsa-sha2-nistp384 ${base64.encode(data)}$comment';
+}
+*/

pubspec.lock

@@ -29,13 +29,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.0"
-  asn1lib:
-    dependency: transitive
-    description:
-      name: asn1lib
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "1.0.0"
   async:
     dependency: transitive
     description:
@@ -57,6 +50,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.0.1"
+  basic_utils:
+    dependency: "direct main"
+    description:
+      name: basic_utils
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "3.1.0"
   benchmark_harness:
     dependency: "direct dev"
     description:
@@ -246,13 +246,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.0.1"
-  crypton:
-    dependency: "direct main"
-    description:
-      name: crypton
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.1"
   csv:
     dependency: transitive
     description:
@@ -949,7 +942,7 @@ packages:
       name: pointycastle
       url: "https://pub.dartlang.org"
     source: hosted
-    version: "3.0.1"
+    version: "3.1.1"
   pool:
     dependency: transitive
     description:

pubspec.yaml

@@ -23,10 +23,10 @@ dependencies:
     git: https://github.com/GitJournal/icloud_documents_path.git
   auto_size_text: ^3.0.0-nullsafety.0
   badges: ^2.0.1
+  basic_utils: ^3.1.0
   connectivity: ^3.0.3
   # cryptography: ^1.4.1
   # cryptography_flutter: ^1.0.0
-  crypton: ^2.0.1
   dashbook: ^0.1.2
   device_info: ^2.0.0
   dots_indicator: ^2.0.0