You should not use md5 for anything. It's completely broken and that's just asking for trouble if someone swaps out whatever your checksums are checking. It's w

You should not use md5 for anything. It's completely broken and that's just asking for trouble if someone swaps out whatever your checksums are checking. It's worth the security to swallow the extra computational power. Though, if you're hosting something no one cares about, it's still worth the security to keep your small audience safe from the random malicious person you thought you'd never see.