Hash function modules define one variable: digest_size: An integer value; the size of the digest produced by the hashing objects.
You could also obtain this value by creating a sample object, and taking the length of the digest string it returns, but using to this copy won't affect the original object.
Some of these interfaces have been codified as Python Enhancement Proposal documents, as PEP 247, "API for Cryptographic Hash Functions", and PEP 272, "API for Block Encryption Algorithms".
This is intended to make it easy to replace old algorithms with newer, more secure ones.
The exact speeds will obviously vary with different machines, different compilers, and the phase of the moon, but they provide a crude basis for comparison.
Currently the cryptographic implementations are acceptably fast, but not spectacularly good.
Examples of cryptographically secure hash functions include MD2, MD5, and SHA1.Much of the code that actually implements the various cryptographic algorithms was not written by me.I'd like to thank all the people who implemented them, and released their work under terms which allowed me to use their code.If you're given a bit of portably-written Python code that uses the DES encryption algorithm, you should be able to use AES instead by simply changing .It's also fairly simple to write your own modules that mimic this interface, thus letting you use combinations or permutations of algorithms.One simple hash function consists of simply adding together all the bytes of the input, and taking the result modulo 256.