When overridden in a derived class, gets an instance of the specified keyed hash algorithm.

在派生类中重写时，获取指定的加密哈希算法的实例。

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This paper introduces the MD5 algorithm and security analysis. A new keyed hash algorithm based on MD5 is proposed.

介绍了MD 5算法及对它的安全性能分析，提出了一个基于MD5的键控散列算法。

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Append the value to the hash value keyed on the field name if it already exists, as this will enable the simple print out of every combination of the field no matter which of the fields matched.

如果值存在，则将其追加到与字段名关联的散列值后，因为这样做将启用每个字段组合的简单输出，而不管哪些字段匹配。

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