默認(rèn)是使用eloquent作為認(rèn)證驅(qū)動(dòng)器，所以看看Illuminate\Auth\EloquentUserProvider里面的實(shí)現(xiàn)
public function validateCredentials(UserContract $user, array $credentials)
{
$plain = $credentials['password'];

return $this->hasher->check($plain, $user->getAuthPassword());
}

所以如果要改驗(yàn)證的邏輯，可以繼承原有的驅(qū)動(dòng)器，然后重寫validateCredentials里面的邏輯
class TestUserProvider extend EloquentUserProvider
{
public function validateCredentials(UserContract $user, array $credentials)
{
$plain = $credentials['password'];

return md5($plain) == $user->getAuthPassword();
}
}

最后設(shè)置驅(qū)動(dòng)器，建議加載AppServiceProvider的boot()里面
Auth::setProvider(new TestUserProvider());