我们需要增强它们的行为，以使函数符合我们的期望，但是我们也需要使用另一个名字重新定义函数，从而避免进一步混淆范围。
We may need to augment their behavior to match what we want the function to do, but we also want to redefine the function with another name to avoid further cluttering the scope.
加密算法和散列函数被进一步分组到密码规范中。
The encryption algorithm and the hash function are further grouped into CipherSpecs.
该方法包含定制函数，稍后将进一步对它进行详述。
This method contains your custom function and is also described in further detail later.
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