2022-02-27 04:07:39 +02:00
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import * as crypto from 'node:crypto';
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2020-03-29 17:16:36 +03:00
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const L_CHARS = '0123456789abcdefghijklmnopqrstuvwxyz';
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const LU_CHARS = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
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export function secureRndstr(length = 32, useLU = true): string {
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const chars = useLU ? LU_CHARS : L_CHARS;
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const chars_len = chars.length;
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let str = '';
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for (let i = 0; i < length; i++) {
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let rand = Math.floor((crypto.randomBytes(1).readUInt8(0) / 0xFF) * chars_len);
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if (rand === chars_len) {
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rand = chars_len - 1;
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}
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str += chars.charAt(rand);
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}
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return str;
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}
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