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Add an implementation of the SHA1 hash algorithm based on a public
domain project by Steve Reid <sreid@sea-to-sky.net>. You can get the
original sources from:
ftp://ftp.funet.fi/pub/crypt/hash/sha/sha1.c
We will need this for several things. File names of note files will be
generated based on a hash their content instead of using a random name.
Items can be uniquely identified using a hash.
In addition to the regular sha1_init(), sha1_update() and sha1_final()
operations, our implementation also contains wrappers for hashing a
string or a stream.
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>
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