a24d99f75c
* change(ui): refactor mob loading * refactor(player): split message loader into separate file, remove toast dependency out of player lib, fix types, fix inspector and screen context * refactor(player): simplify file loading, add safe error throws * refactor(player): move loading status changers to the end of the flow
43 lines
1.4 KiB
TypeScript
43 lines
1.4 KiB
TypeScript
import { gunzipSync } from 'fflate'
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const u8aFromHex = (hexString:string) =>
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Uint8Array.from(hexString.match(/.{1,2}/g).map((byte) => parseInt(byte, 16)))
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const is16BitHex = (maybeHex: string | undefined) =>
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maybeHex && maybeHex.length % 2 === 0 && !/[^a-fA-F0-9]/u.test(maybeHex)
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export function decryptSessionBytes(cypher: Uint8Array, keyString: string): Promise<Uint8Array> {
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if (keyString.length !== 64) {
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return Promise.reject("Wrong key string format")
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}
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const [hexKey, hexIV] = keyString.match(/.{32}/g)
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if (!is16BitHex(hexIV) || !is16BitHex(hexKey)) {
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return Promise.reject("Wrong key/iv pair")
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}
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const byteKey = u8aFromHex(hexKey)
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const iv = u8aFromHex(hexIV)
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return crypto.subtle.importKey("raw", byteKey, { name: "AES-CBC" }, false, ["decrypt"])
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.then(key => crypto.subtle.decrypt({ name: "AES-CBC", iv: iv}, key, cypher))
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.then((bArray: ArrayBuffer) => new Uint8Array(bArray))
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.then(async (u8Array: Uint8Array) => {
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const isGzip = u8Array[0] === 0x1F && u8Array[1] === 0x8B && u8Array[2] === 0x08;
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if (isGzip) {
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const now = performance.now()
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const data = gunzipSync(u8Array)
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console.debug(
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"Decompression time",
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Math.floor(performance.now() - now) + 'ms',
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'size',
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Math.floor(u8Array.byteLength/1024),
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'->',
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Math.floor(data.byteLength/1024),
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'kb'
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)
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return data
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} else return u8Array
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})
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//?? TS doesn not catch the `decrypt`` returning type
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}
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