custom-hash

custom-hash lets you create (very) customisable hashes of 128 bits or less.

Main use case

Deterministically creating a hash of a limited length, using a defined set of characters.

var hash = require('custom-hash');
hash.configure({ charSet: [ 'A', 'B', 'C', 'D', 'E', 'F' ], maxLength: 10 });

hash.digest('Hello World');
-> 'BECFBFECAD'

hash.digest('Hello World!');
-> 'CCABBACAEE'

Configuration

Without customisation, custom-hash is just an inefficient way of generating an MD5 hash.

hash.digest('Hello World!');
-> 'ed076287532e86365e841e92bfc50d8c'

Converting the MD5 hash to a different base is done by changing the number of characters in the charSet config property.

hash.configure({ charSet: [ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' ] });
hash.digest('Hello World!');
-> '315065379476721403163906509030895717772'

Shortening the output is achieved by decreasing the value of the maxLength config property.

hash.configure({ maxLength: 10 });
hash.digest('Hello World!');
-> 'ed07628753'

Choosing the part of the hash to use is achieved by setting right to true in the config.

hash.configure({ right: true, maxLength: 10 });
hash.digest('Hello World!');
-> '92bfc50d8c'

Default config values

They are,

var DEFAULTS = {
    charSet: [ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' ],
    maxLength: 128,
    right: false
};

A parameterless call to the function configure resets the configuration to its default values.

var hash = require('custom-hash');
hash.configure();

Contributing

Please run the following commands before submitting a pull-request,

npm run lint
npm run code-style
npm run test