code: public static CipherUtil buildInstance(Algorithms algorithms, String seed) {
          int keySize = 0;
          if (algorithms == Algorithms.AES) {
              keySize = 128;
          } else if (algorithms == Algorithms.DES) {
              keySize = 56;
          }
          return buildInstance(algorithms, seed, keySize);
      }
docs: SymmetryCipher构造器，采用默认keySize
  
  @param algorithms 算法，当前仅支持AES和DES
  @param seed       随机数种子
  @return SymmetryCipher