... 特快专递封 Express mail service envelope 签名封 Signature cover 挂号信封 Registration envelope ...
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当调用 sign 方法时，如果不传递任何参数的话，生成的就是封外签名。
The enveloping signature is created when the sign method is called without any arguments.
封内签名（Enveloped signature）： 元素成为被签名数据的子元素。
Enveloped signature: The element becomes a child element of the data being signed.
共支持全部三种签名模式：封外、封内以及分离模式。
All three modes of signatures — enveloping, enveloped, and detached — are supported.
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