code: public byte[] wrapKeyByKey(Key key,Key wrapKey)
  	{
  		try {
      		if(key==null ||wrapKey==null)
      		{
      			return null;
      		}
  			Cipher cipher=Cipher.getInstance(algorithm);
  			//使用私钥包裹模式
  			cipher.init(Cipher.WRAP_MODE,wrapKey);
  			return cipher.wrap(key);
  		} catch (Exception e) {
  			log.error(e.getMessage(),e);
  		}
      	return null;
  	}
docs: 用密钥包裹密钥
  @param key
  @param wrapKey
  @return