User password decoding

Hi guys,

I have a situation that I need to fix. We are moving our website to another system (not my choice).

I want to migrate all the users. The users should still be able to login with their old password.

I have read somewhere that nopCommerce uses SHA1 as an encryptor which is awesome but the new system only accepts either the password as plain text or MD5.

So my question is how can I convert the password to MD5?

Thanks for the help.

Engin

SHA1 is a one way encryption method.  
The purpose of SHA1 is to make it impossible (or with the current processing power very hard) to decrypt a hashed password.
So moving to another (hashing) system (MD5 or plain text) would mean you cannot reuse existing passwords and have to start with reset passwords.