A fortran module for SHA-256 hashing.
To run the unit-tests install 'funit' http://nasarb.rubyforge.org/ and run with something like:
FC="gfortran -fno-range-check -O3" funit
The '-fno-range-check' flag is required since the fortran standard otherwise doesn't allow us to work with all bits in the integers (as if they were unsigned).
The quick and dirty routine (dirtys_sha256) operates on whatever bits that come in, without swapping to big-endian words, and does therefore not pas any of the standard tests - but works at roughly twice the speed. Use this if you want a good hash function but don't care about following the SHA-256 standard specifications.
Note that this code will not produce the same results on big-endian machines and the module was only tested on a little-endian Ubuntu LTS 12.04 system using gfortran 4.6.3.
If you found this useful, please let me know.
Mikael Leetmaa leetmaa@kth.se