hashabler: Principled, portable & extensible hashing of data and types, including an implementation of the FNV-1a and SipHash algorithms.

This package is a rewrite of the hashable library by Milan Straka and Johan Tibell, having the following goals:

• Extensibility; it should be easy to implement a new hashing algorithm on any Hashable type; in this package we provide SipHash and FNV-1a.

• Honest hashing of values, and principled hashing of algebraic data types (see e.g. hashable issues #74 and #30)

• Cross-platform consistent hash values, with a versioning guarantee. Where possible we ensure morally identical data hashes to indentical values regardless of processor word size and endianness.

• Make implementing identical hash routines in other languages as painless as possible. In addition to SipHash, we provide an implementation of a simple hashing algorithm (FNV-1a) and make an effort to define Hashable instances in a way that is well-documented and sensible, so that e.g. one can easily implement a string hashing routine in JavaScript that will match the way we hash strings here.

Versioning: Except for instances where we specifically note that we make no promise of consistency, changes to hash values (and consequently changes to StableHashable values, where applicable) entail a major version number bump.

Modules

[Index]

Flags

Manual Flags

Name	Description	Default
dev	To build tests, executables and benchmarks do `configure -fdev --enable-tests` and run the built executables by hand (i.e. not with `cabal test` etc.; we put all our different executables in test-suite sections in order to hide their dependencies from hackage)	Disabled
instrumented	Enables assertions in library code. When --enable-library-profiling and --enable-executable-profiling is turned on, you can get stacktraces as well	Disabled

Automatic Flags

Name	Description	Default
integer-gmp	Are we using integer-gmp to provide fast Integer instances? This is ignored when using ghcjs	Enabled

Use -f <flag> to enable a flag, or -f -<flag> to disable that flag. More info

Downloads

• hashabler-2.0.0.tar.gz [browse] (Cabal source package)
• Package description (revised from the package)

Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.

Maintainer's Corner

Package maintainers

• BrandonSimmons

For package maintainers and hackage trustees

• edit package information

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