code: static String toOpenSsl(String javaCipherSuite, boolean boringSSL) {
          String converted = j2o.get(javaCipherSuite);
          if (converted != null) {
              return converted;
          }
          return cacheFromJava(javaCipherSuite, boringSSL);
      }
docs: Converts the specified Java cipher suite to its corresponding OpenSSL cipher suite name.
  
  @return {@code null} if the conversion has failed