Microsoft Windows ISO checksums
An MSDN subscription is not needed to browse the contents on the Subscriber Downloads page.
Once there, you can browse to any product and click on the Details
link to see the SHA1 hash for the product
for ex.: Windows XP Service Pack 3 (x86) - CD (English)
Windows XP Service Pack 3 (x86) - CD (English)
SHA1: 8fa76ccea145d050fc6a506ffbdedfe53282e5b4