Is there any official documentation with this information?
The Algorithm used to encrypt the Password field when the PasswordFormat = Hashed.
I think that making this information public would possibly risk the security of every nopCommerce site....
I have proposed a future solution for this issue here:
The nopCommerce 4.1 appears to use SHA512, the value is stored in the settings table under the Name 'customersettings.hashedpasswordformat'.