The actual checking is probably quite trivial, but very dependent on how the credentials are stored. For example, if you have a mysql database table then a query along the lines of:

SELECT something from users where username=? and password=PASSWORD(?);

[download]

Followed by a count of the rows returned would do the job.

Other ways of storing the credentials would have different ways of accessing them, so this problem is very dependent on the specifics.

In reply to Re: password checking? by dorward
in thread password checking? by ninja_byte

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