The SSL Server responds with the encryption algorithm and hash function to be used.
SSL服务器用加密算法以及要使用的散列函数来表示响应。
Also note that the given PHP code won't work for you as I added special functions exporting the table mask and hash function to mz version of PHP.
另外要注意的是，这些代码在你的环境中是无法工作的，因为我在PHP源码中添加了一些表掩码和哈希函数相关的代码。
Clearly, for this process to work, the sender and receiver must agree on the hash function that will be used before transmission begins.
显然，要让这个过程生效，发送方和接收方必须在传送开始前就即将使用的散列函数达成一致。
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