Would this not mean that someone who knows one of your passwords would be able to get access to the others?
I’m not sure I understand what it is you’re doing. Are you making it so that you store the SHA-1 hash of your master password and your account password?
As in, if my master password was f0ob@r, and I was making a Google account,
would I have my google account password as
f0ob@rgoogle? (or 7b2fbc46444cb79c78a25edf7e1639514719ae9c)