69 lines
1.8 KiB
JavaScript
69 lines
1.8 KiB
JavaScript
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import { arr2hex, hex2arr, alphabet } from './util.js'
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import { decode, encode } from 'base64-arraybuffer'
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const decoder = new TextDecoder()
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// 50% slower at < 48 chars, but little impact at 4M OPS/s vs 8M OPS/s
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export const arr2text = (data, enc) => {
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if (!enc) return decoder.decode(data)
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const dec = new TextDecoder(enc)
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return dec.decode(data)
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}
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// sacrifice ~20% speed for bundle size
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const encoder = new TextEncoder()
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export const text2arr = str => encoder.encode(str)
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export const arr2base = data => encode(data)
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export const base2arr = str => new Uint8Array(decode(str))
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export const bin2hex = str => {
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let res = ''
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let c
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let i = 0
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const len = str.length
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while (i < len) {
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c = str.charCodeAt(i++)
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res += alphabet[c >> 4] + alphabet[c & 0xF]
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}
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return res
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}
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const MAX_ARGUMENTS_LENGTH = 0x10000
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export const hex2bin = hex => {
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const points = hex2arr(hex)
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if (points.length <= MAX_ARGUMENTS_LENGTH) return String.fromCharCode(...points)
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let res = ''
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let i = 0
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while (i < points.length) {
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res += String.fromCharCode(...points.subarray(i, i += MAX_ARGUMENTS_LENGTH))
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}
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return res
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}
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const scope = typeof window !== 'undefined' ? window : self
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const crypto = scope.crypto || scope.msCrypto || {}
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const subtle = crypto.subtle || crypto.webkitSubtle
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const formatMap = {
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hex: arr2hex,
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base64: arr2base
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}
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export const hash = async (data, format, algo = 'sha-1') => {
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if (!subtle) throw new Error('no web crypto support')
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if (typeof data === 'string') data = text2arr(data)
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const out = new Uint8Array(await subtle.digest(algo, data))
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return format ? formatMap[format](out) : out
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}
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export const randomBytes = size => {
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const view = new Uint8Array(size)
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return crypto.getRandomValues(view)
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}
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export * from './util.js'
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