Improving availability and guaranteeing integrity in ISO - internal sha1sums

Jesse Keating jkeating at
Sun Jun 10 11:47:17 UTC 2007

On Sunday 10 June 2007 00:31:51 David Timms wrote:
> I am not sure how you do that - how can you include inside a piece of
> data a checksum that uses the data {including itself} to calculate the
> checksum ? {sounds like one for the crytologists}. Perhaps it is outside
> the data area, but then you have no way to know if the implanted
> checksum is broken or that data itself {although I imagine it is likely
> to be the data}.
> What I am after is a checksum for each file present within the iso, not
> the result for the whole iso. Is there such a thing already present ?

Check out /usr/lib/anaconda-runtime/implantisomd5 for what it does.  I'm not 
actually sure how / what it calculates, would be worth a read.

Jesse Keating
Release Engineer: Fedora
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