你可能还有两个客户端校验来确保用户名和密码不要少于一位字符或太长，或者不包含任何无效字符。
You might also have two client-side validators that ensure that the username and password are at least a character or so long, or perhaps don't contain any invalid characters.
散列函数是密码学的基础要素之一，主要应用方向是数据完整性校验和身份认证技术。
The hashing function is one of the basic foundations of the cryptography. It widely used in data integrality and identity authentication.
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