So, I need my Fedora fix on x86. But I also wanted to verify disc 3 badly, seeing that I had to download it over many segments. Come OpenSSL to the rescue.
openssl dgst -sha1 FC4-i386-disc{1,2,3,4).iso
That magic command gave me the right sha1sum’s, to match with the SHA1SUM that is provided. man openssl and man dgst clearly helped!