Solved How to encrypt Password in merlin


Occasional Visitor
Hi All,
Could someone have the experience to encrypt the password to save into shadow file?
I want auto-generating VPN client's username/password. for example, I want to generate users account range "Test-001, Test-002 ... Test-010" then also generate 10 random passwords for each user. My question is if I make the username and password by script auto-generated, my script should encrypt all passwords and save into //etc//shadow files for OpenVPN service login use.
Does anyone know the way to encrypt passwords for OpenVPN format similar below string text:



Senior Member
I don't want to hijack this thread, but I've been looking for a way to decrypt passwords stored in nvram, I know they are not encrypted using Crypt, I'm pretty sure passwords in nvram can be decrypted, not like passwords in //etc//shadow are nearly impossible to decrypt.

Do you have anything to share about how it works? @RMerlin

edit: now I know why there are double slashes in there // :confused:


Occasional Visitor
@Yota right, the shadow file is made by the system and according to the following document

As the name implies, a shadow password file is a secondary password file that shadows the primary password file. On Solaris and Linux systems, the shadow password is usually stored in the file //etc//shadow and contains the encrypted password and a password expiration date. The //etc//shadow file is protected so that it can be read only by the superuser. Thus, an attacker cannot obtain a copy to use in verifying guesses of passwords.

The shadow file is read only.

So, my purpose is to generate VPN username and password automatically by script, not by manual.
Seems I make the whole thing too complicated. The easy way is below:
1. auto-create username and password like <Test-001>Test-001
2. Attach <Test-001>Test-001 end of vpn_serverx_clientlist. (nvram set vpn_serverx_clientlist=<Test-001>Test-001)
3. nvram commit
4. reboot
5. Then the Username <Test-001> and password Test-001 were auto-generated in //etc//password and //etc//shadow

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