How to use htaccess to force https on the homepage only

I want to force https:// on the index page only of a site.
Right now, I am using htaccess to append www to the url:

RewriteEngine on
RewriteCond %{HTTP_HOST} !^www.mysite.com$
RewriteRule ^(.*)$ http://www.mysite.com/$1 [R=301]

How do I force ssl to only the index page? There is a login box on this page and I need it to be secure, but the rest of the pages, I dont want to force ssl (I will control the rest through navigation).
lexoAsked:
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ravenplCommented:
RewriteEngine on
RewriteCond %{HTTP_HOST} !^www.mysite.com$
RewriteRule ^(.*)$ http://www.mysite.com/$1 [L,R=301]

RewriteCond %{HTTPS} !=on
RewriteCond %{REQUEST_URI} ^(/|/index.php|/index.html)$
RewriteRule .* https://www.mysite.com%{REQUEST_URI} [L,R=301]
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