Massive users update passwords fwm dbimport

[Dioklo]

Hello,

In CP R77.30 I have to massively update vpn users (without LDAP).
I saw "fwm dbimport" but they say in manual (https://sc1.checkpoint.com/documents/R77/CP_R77_CLI_ReferenceGuide_WebAdmin/html_frameset.htm?topic=...)
that The password should be encrypted with the C language encrypt function! But I don´t find what is this "C language encrypt function".
Any one has an idea?

Thanks