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Oct 19, 2012, 03:56 #1
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- Jul 2012
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Best method for storing and validating login credentials
I'm relatively new to PHP. Currently I'm using md5() to hash and store passwords. Something like:
$salt = 'SomeSaltString'; //fixed salt $password = 'SomePassword'; $pass = md5($salt . $password);
$hash = crypt('SomePassword', '$2a$07$StrThatIs21Characters$'); //output: $2a$07$StrThatIs21Characters.GDZ.DtvzhBXbOr3S5W68Rh5PFgnomoq
1]. $2a indicates strength level?
2]. $07 something to do with round trips? Please elaborate further on this...
3]. StrThatIs21Characters$ - salt needs to be 22 chars in length including the $. Should this be a fixed salt?? I'm getting conflicting info on this...
These are the important implementation questions:
4]. What part of the output should be stored in the database [in the password column]?
5]. What data type best suits the password column? Perhaps nvarchar?
6]. How should a login attempt be verified when using this method?