@easen-tools/uuid
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Generate fast and cryptographically secure UUID v4
35 lines (32 loc) • 753 B
JavaScript
/**
* Generate unsafe binary UUID v4.
* This function is using Math.random for randomness,
* which is not cryptographically secure, but fast.
*
* @returns {int[]}
*/
function generateUnsafeBinaryUuid () {
const d0 = Math.random() * 0xffffffff
const d1 = Math.random() * 0xffffffff
const d2 = Math.random() * 0xffffffff
const d3 = Math.random() * 0xffffffff
return [
d0 & 0xff,
d0 >> 8 & 0xff,
d0 >> 16 & 0xff,
d0 >> 24 & 0xff,
d1 & 0xff,
d1 >> 8 & 0xff,
d1 >> 16 & 0x0f | 0x40,
d1 >> 24 & 0xff,
d2 & 0x3f | 0x80,
d2 >> 8 & 0xff,
d2 >> 16 & 0xff,
d2 >> 24 & 0xff,
d3 & 0xff,
d3 >> 8 & 0xff,
d3 >> 16 & 0xff,
d3 >> 24 & 0xff
]
}
module.exports = generateUnsafeBinaryUuid