I was tested this, and downloaded the source 'tarball' by hand, but I got a file name `jdk-7u17-linux-x64.gz` (not `.tar.gz`), even though the download link mentions `.tar.gz`. md5sum on my end is `d9b5870a94c47efa0282d6c1863d0667`.

When I unzip the file, I do get a tar file though (without a proper extension).