38 lines
907 B
JavaScript
38 lines
907 B
JavaScript
const lookup = "0123456789ABCDEFGHJKMNPQRSTVWXYZ"
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const base32 = array => {
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const size = array.BYTES_PER_ELEMENT * 8
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const b32_length = Math.ceil(array.length * size / 5)
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const buffer = new Array(b32_length)
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let pointer = array.length
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let acc = array[--pointer]
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let bits = size
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for (let i=b32_length-1; i>=0; --i) {
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while (bits < 5) {
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if (pointer > 0)
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acc += (array[--pointer] * 2 ** bits)
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bits += size
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}
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buffer[i] = lookup[acc % 32]
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acc = Math.floor(acc / 32)
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bits -= 5
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}
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return buffer.join('')
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}
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const bytes = length => integer => {
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const array = new Uint8Array(length)
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for (let i=length-1; i>=0; --i) {
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array[i] = Math.floor(integer % 256)
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integer = integer / 256
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}
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return array
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}
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export default (time = Date.now()) => {
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const array = new Uint8Array(16)
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array.set(bytes(6)(time))
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array.set(crypto.getRandomValues(new Uint8Array(10)), 6)
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return base32(array)
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}
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