Is there any way to encrypt the password with JS oder any other Language than PHP to match the encrypted SilverStripe password?
There are all kinds of ways to encrypt a password, in all kinds of languages, yes. What is it that you’re looking to achieve?
I already have a solution. I copied the blowfish password php file and exposed it on a separate endpoint.
Since I was not able to compute the correct hash which is in the SilverStripe Database