The problem is that when you read the CD-ROM as a raw device, it will return
more data than the length of the ISO image; there are almost always some
additional sectors of padding beyond the end of the image. Even dd'ing from
the CD-ROM into shasum won't work unless you tell dd the number of blocks to
copy, so that you don't include the padding.
Try something like
dd if=/dev/sr0 of=foo.img bs=2k count=`isosize -d 2048 /dev/sr0` |
sha256sum -
Note the backquotes for command substitution of the output of isosize.
I haven't tried this just now, so it's possible that I've got the details
wrong.
Eric
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