Eightbyte

Javascript does not contain 64 bit operations....

Instead, the standard complies to a 64 bit floating point representation that gives 58 bits of precision in integers.

The functions include:

• add(a, b) :: Addition
• multiply(a, b) :: Multiplication
• shiftr(a, bits) :: Shift right
• shiftl(a, bits) :: Shift left
• rotl(a, bits) :: Rotate left
• where (a) or (b) are a 64 bit integer of format [nHigh, nLow]

Usage

var long = require('eightbyte');

var added = long.add([0xAABBCCDD, 0x0011FFEE], [0x00112233, 0x44556677]),
    added_hex = added.hex();

var mult = long.multiply([0xAABBCCDD, 0x0011FFEE], [0x00112233, 0x44556677]),
    mult_hex = mult.hex();

var shiftr = long.shiftr([0xAABBCCDD, 0x0011FFEE], 2),
    shiftr_hex = shiftr.hex();

var shiftl = long.shiftl([0xAABBCCDD, 0x0011FFEE], 16),
    shiftl_hex = shiftl.hex();

var rotl = long.rotl([0xAABBCCDD, 0x0011FFEE], 2),
    rotl_hex = rotl.hex();

var rotr = long.rotr([0xAABBCCDD, 0x0011FFEE], 2),
    rotr_hex = rotr.hex();

Formating

By default, the functions return the array representation of the long ([32bit, 32bit]).

For hex formatting, use:

// returns 16 character hex representation as a string
var long = require('eightbyte');
var string_hex = long.add(first_long, second_long).hex();

Testing

Install mocha and should using

npm install --dev

Note: npm 1.2.18 contains a bug that tries to install the development version of all devDependencies. Omit the --dev option and it should work correctly.

Once everything is installed:

make test