D4587.id14959.diff
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	diff --git a/web/utils/device-id.js b/web/utils/device-id.js
	new file mode 100644
	--- /dev/null
	+++ b/web/utils/device-id.js
	@@ -0,0 +1,34 @@
	+// @flow
	+import crypto from 'crypto';
	+
	+export const deviceIDTypes = Object.freeze({
	+ KEYSERVER: 0,
	+ WEB: 1,
	+ MOBILE: 2,
	+});
	+export type DeviceIDType = $Values<typeof deviceIDTypes>;
	+
	+const alphanumeric =
	+ '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
	+const deviceIDLength = 64;
	+
	+function generateDeviceID(type: DeviceIDType): string {
	+ const rand = crypto.randomBytes(deviceIDLength);
	+ let suffix = '';
	+
	+ for (let i = 0; i < deviceIDLength; i++) {
	+ const index = rand[i] % alphanumeric.length;
	+ suffix += alphanumeric.charAt(index);
	+ }
	+
	+ if (type === deviceIDTypes.KEYSERVER) {
	+ return `ks:${suffix}`;
	+ } else if (type === deviceIDTypes.WEB) {
	+ return `web:${suffix}`;
	+ } else if (type === deviceIDTypes.MOBILE) {
	+ return `mobile:${suffix}`;
	+ }
	+ return '';
	+}
	+
	+export { generateDeviceID };