docs: public static X509Certificate[] copyCertChain(X509Certificate[] certChain) {
  
          if (certChain == null) {
              return null;
          }
  
          final int LEN = certChain.length;
          if (LEN == 0) {
              return new X509Certificate[LEN];
          }
  
          X509Certificate[] newCertChain = new X509Certificate[LEN];
          System.arraycopy(certChain, 0, newCertChain, 0, LEN);
  
          return newCertChain;
      }