code: public static byte[] hash(byte[] body) {
          if (HASH_DIGEST != null) {
              return HASH_DIGEST.digest(body);
          } else {
              throw new EvernoteUtilException(EDAM_HASH_ALGORITHM + " not supported", new NoSuchAlgorithmException(EDAM_HASH_ALGORITHM));
          }
      }
docs: Returns an MD5 checksum of the provided array of bytes.