Retrieve hashed PHP password from database and check against a submitted password in Javascript -

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i have options page in project , in can change password. have form asks enter current password, new password , confirm password. check data errors , send server using jquery ajax.

the problem have need check current password against password stored in database.

the database password hashed using php sha1($database_password.$salt);

i thinking pass php variables, $database_password , $salt javascript somehow , use sha1() js alternative sha1 javascript code see if current password matches database password.

can give me pointers or there alternative ways?

i think it's better leave password hash on server. can ajax request current password , have server validate it. way hash remains unknown user , brute force attack more difficult.

of course should send current password (and new password) once user indicates has finished typing (ie. when clicks submit button).


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