[cheez]

Yep, basically:

    if(userHasUpdatedPw) { checkPw(hash(pw)) }
    else{ checkPw(hash(pw+pw)) }

[saifelse]

More like:

    if(userHasUpdatedPw) { checkPw(hash(pw)) }
    else{ checkPw(hash(assertDoubledAndTakeHalf(pw)))}

[cheez]

Probably