docs: private static SecretKeySpec keySpecFromSecretKey(String secretKey) {
          if (!keySpecs.containsKey(secretKey)) {
              byte[] ivraw = secretKey.getBytes();
              SecretKeySpec skeySpec = new SecretKeySpec(ivraw, "AES"); //$NON-NLS-1$
              keySpecs.put(secretKey, skeySpec);
          }
          return keySpecs.get(secretKey);
      }