Acceptable Hashes by shadow
Passwords are hashed using the library functioncrypt(3); see the manual page for crypt(3). The function chooses the encryption function based on the format of the salt:
-
$1$salt_chars$: use MD5 -
$2a$salt_chars$: use Blowfish (not standard, most likely not available) -
$5$salt_chars$: use SHA-256 -
$6$salt_chars$: use SHA-512 - Not in the form
$type$salt_chars$: use DES as in the old days.
I have no idea if you can use PHP to emulate exactly what crypt(3) does.