crypt() function returns different result size on different server

Question

I need to transfer some hashed password on a new server from old one. Old server has php 5.4.4 and crypt() function on password return a string 102 characters. My new server has php 5.5.7 and crypt function return a string of 34 characters. On both server, crypt is called without parameters

crypt($password);

On user login (on old server) i use this code:

crypt($_POST['password'], $hash_password) == $hash_password

Now, if i copy hash passwords to new hosting, and i call that method for check if password is correct, password never match. How can i do to make the same type of hashing to that different server?

this is an example of two crypted password:

on old server:

$6$kcPF.fPojej2$YF5Ui0nP8t5Wc0JVVEI9.JD2l/ZyLQGL6T5RN3E5oz3GGiSZoTBsbocMggLkdlBhO6Xe7cGdepW7bo6mKFjYx1                                                            

on new server

$1$Sz1cDmU0$Z0uoEwnXH1NokqPwwQJsp/

Answer 1

The old server is using the SHA256 algorithm to create hashes, but the new server doesn't seem to support it; in other words, the constant CRYPT_SHA512 is 0.

Depending on how PHP is installed on the new server you may have to check whether libcrypt is recent enough or contact the hosting company that provides the server.