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29 lines
838 B
29 lines
838 B
/**
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* @function randomBytes
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* @description Uses JS-native CSPRNG to generate a specified number of bytes.
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* NOTE: this method throws if no PRNG is available.
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* @param {Number} bytes bytes number to generate
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* @return {String} ramdom hex string
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*/
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export const randomBytes = (bytes: number): string => {
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let randBz: number[] | Uint8Array;
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if (
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typeof window !== 'undefined' &&
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window.crypto &&
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window.crypto.getRandomValues
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) {
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randBz = window.crypto.getRandomValues(new Uint8Array(bytes));
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} else if (typeof require !== 'undefined') {
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randBz = require('crypto').randomBytes(bytes);
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} else {
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throw new Error('Unable to generate safe random numbers.');
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}
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let randStr = '';
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for (let i = 0; i < bytes; i += 1) {
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randStr += `00${randBz[i].toString(16)}`.slice(-2);
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}
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return randStr;
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};
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