From 'man 3c crypt' in my gcc installation: 

       By taking the lowest 7 bits of each  of  the  first  eight
       characters  of  the  key,  a 56-bit key is obtained.  This
       56-bit key is used to encrypt repeatedly a constant string
       (usually  a string consisting of all zeros).  The returned
       value points to the encrypted password,  a  series  of  13
       printable  ASCII characters (the first two characters rep-
       resent the salt  itself).   The  return  value  points  to
       static data whose content is overwritten by each call.

[download]

You are limited to 8 characters for the password no matter how many input characters are allowed. Also, the output will be exactly 13 characters long.

If you want to allow longer passwords, look at MD5 instead of crypt. Your passwords can be arbitrarily long and the resulting hash will be 32 characters for hex and 22 for base64.

HTH

In reply to Re: Storing encryted passwords in MySQL by pzbagel
in thread Storing encryted passwords in MySQL by spacewarp

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