fix(core): update

ts/smartcrypto.classes.privatekey.ts

@@ -21,4 +21,8 @@ export class PrivateKey {
   public toPemString(): string {
     return plugins.nodeForge.pki.privateKeyToPem(this.forgePrivateKey);
   }
+
+  public toOpenSSH(): string {
+    return plugins.nodeForge.ssh.privateKeyToOpenSSH(this.forgePrivateKey, 'user@host');
+  }
 }