#8 Add MD5 support

[Anonymous]

It would be great to extend the current Hash function
to use MD5 (or SHA).
This would allow to check the archive's integrity
before restoring it.

MD5 hash could be implemented as an option on targets.

In addition, it would be really great if the md5
function used md5 files compatible with the ones
written by the famous md5sum command under Unix. This
would make it possible to crosscheck files individually.

http://www.jonelo.de/java/jacksum/index_de.html
- advantages: offers not only MD5 but also SHA and RIPEMD
- license: GPL

http://www.twmacinta.com/myjava/fast_md5.php
- advantages: can compute hash of a files instead of
streams or byte[]
- license: LGPL

[aventin]

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Will slow down the backup process too much

[aventin]

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user_id=1543595
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Will slow down the backup process too much