D. J. Bernstein
Authenticators and signatures
hash127

How to install hash127

Like any other piece of software (and information generally), hash127 comes with NO WARRANTY.

Installation

Download the hash127 package. The latest published hash127 package is hash127-0.70.tar.gz.

Unpack the hash127 package:

     gunzip hash127-0.70.tar
     tar -xf hash127-0.70.tar
     cd hash127-0.70

Compile the hash127 library and test programs:

     make

As root, install the library in /usr/local:

     make setup check

Testing

Check the hashes for some sample inputs:

     ./accuracy | cmp - accuracy.exp

Normally this prints nothing.

See how fast the hashing is:

     ./speed

To report success:

     ( echo 'First M. Last'; cat `cat SYSDEPS`; ./speed ) \
     | mail djb-sysdeps@cr.yp.to

Replace First M. Last with your name.

Things to do if you have spare time

For a more extensive test:

     ./accuracy2 | cmp - accuracy2.exp

Normally this prints nothing. Note that this test takes about half an hour on a new workstation; it hashes 262 million messages totalling 130 billion bytes of data.

If you're interested in trying to extract the best possible speed out of hash127, you can edit conf-cc and conf-ld to select a compiler, and conf-opt to select machine-specific optimizations; then recompile.