A new version of the digest package (which generates hash function summaries for
arbitrary (and possibly nested) R
objects using any of the standard md5, sha-1, sha-256, sha-512 or crc32 algorithms)
is now on CRAN, and I will push the
corresponding version into Debian in a moment.
For this release, Hannes Muehleisen added support for sha-512 using an older
standalone function by Aaron D. Gifford
which I had to whip into slightly more portable shape to work on