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For a small project I needed a small hash function (eg. not some kind of monster like SHA-256),
first I used HashUtil from the Flex SDK and then realised the output was not correct, so I searched, tested and ahem got carried away :p.
More importantly, I find myself reimplementing stuff in ActionScript 3.0 and I needed correct hash functions, for example: I want the same result that java.util.zip.CRC32 generates in Java, not an equivalent, the same; and then you realise you have 36x different implementations of CRC-32.
For ex: Which CRC-32 algorithm is used in the Java CRC-32 class ?.
Anyway, it's because of details like this that I need so many different implementations.
TODO
list of every hash functions implemented in the hash library
Hash function
Wikipedia
Checksum
Wikipedia
Cyclic redundancy check (CRC)
Wikipedia
List of hash functions
Wikipedia
General Purpose Hash Function Algorithms
Arash Partow
Hash Functions
Bret Mulvey
note: very good explanation of hash functions
Catalogue of parametrised CRC algorithms
Sourceforge
classless-hasher (google code) .NET Hash and Checksum Algorithm Library
list of provided algorithms
repo moved to classless-hasher (bitbucket)