feat(encryption): Added support for AEAD encryption algorithms

lib/src/ssh_key_pair.dart

@@ -239,8 +239,20 @@ class OpenSSHKeyPairs {
 
     final key = Uint8List.view(kdfHash.buffer, 0, cipher.keySize);
     final iv = Uint8List.view(kdfHash.buffer, cipher.keySize, cipher.ivSize);
-    final decryptCipher = cipher.createCipher(key, iv, forEncryption: false);
-    return decryptCipher.processAll(blob);
+
+    try {
+      if (cipher.isAead) {
+        final decryptCipher = cipher.createAEADCipher(key, iv,
+            forEncryption: false) as AEADCipher;
+        return decryptCipher.processAll(blob);
+      } else {
+        final decryptCipher =
+            cipher.createCipher(key, iv, forEncryption: false);
+        return decryptCipher.processAll(blob);
+      }
+    } catch (e) {
+      throw SSHKeyDecryptError('Failed to decrypt private key', e);
+    }
   }
 
   @override

lib/src/ssh_transport.dart

@@ -1699,7 +1699,8 @@ class SSHTransport {
   /// initialized in both directions.
   bool get hasIntegrityProtection {
     final usingAeadLocal = _localAeadKey != null || _localChaChaEncKey != null;
-    final usingAeadRemote = _remoteAeadKey != null || _remoteChaChaEncKey != null;
+    final usingAeadRemote =
+        _remoteAeadKey != null || _remoteChaChaEncKey != null;
     if (usingAeadLocal && usingAeadRemote) return true;
     return _localMac != null && _remoteMac != null;
   }

lib/src/utils/cipher_ext.dart

@@ -18,6 +18,13 @@ extension BlockCipherX on BlockCipher {
   }
 }
 
+extension AEADCipherX on AEADCipher {
+  Uint8List processAll(Uint8List data) {
+    final cipher = this as dynamic;
+    return cipher.process(data) as Uint8List;
+  }
+}
+
 extension MacX on Mac {
   void updateAll(Uint8List data) {
     update(data, 0, data.length);