29 lines
534 B
JavaScript
29 lines
534 B
JavaScript
const { random } = require('@lukeed/csprng');
|
|
|
|
var SIZE=4096, HEX=[], IDX=0, BUFFER;
|
|
|
|
for (; IDX < 256; IDX++) {
|
|
HEX[IDX] = (IDX + 256).toString(16).substring(1);
|
|
}
|
|
|
|
function v4() {
|
|
if (!BUFFER || ((IDX + 16) > SIZE)) {
|
|
BUFFER = random(SIZE);
|
|
IDX = 0;
|
|
}
|
|
|
|
var i=0, tmp, out='';
|
|
for (; i < 16; i++) {
|
|
tmp = BUFFER[IDX + i];
|
|
if (i==6) out += HEX[tmp & 15 | 64];
|
|
else if (i==8) out += HEX[tmp & 63 | 128];
|
|
else out += HEX[tmp];
|
|
|
|
if (i & 1 && i > 1 && i < 11) out += '-';
|
|
}
|
|
|
|
IDX += 16;
|
|
return out;
|
|
}
|
|
|
|
exports.v4 = v4; |