Created
November 28, 2015 14:41
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UUID.js
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// Reminder: this is not crypto, just UUID | |
// Source & licence: https://littlemaninmyhead.wordpress.com/2015/11/22/cautionary-note-uuids-should-generally-not-be-used-for-authentication-tokens/ | |
function randomUUID() { | |
var s = [], itoh = '0123456789ABCDEF'; | |
// Make array of random hex digits. The UUID only has 32 digits in it, but we | |
// allocate an extra items to make room for the '-'s we'll be inserting. | |
for (var i = 0; i < 36; i++) s[i] = Math.floor(Math.random()*0x10); | |
// Conform to RFC-4122, section 4.4 | |
s[14] = 4; // Set 4 high bits of time_high field to version | |
s[19] = (s[19] & 0x3) | 0x8; // Specify 2 high bits of clock sequence | |
// Convert to hex chars | |
for (var i = 0; i < 36; i++) s[i] = itoh[s[i]]; | |
// Insert '-'s | |
s[8] = s[13] = s[18] = s[23] = '-'; | |
return s.join(''); | |
} |
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