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improve randomness

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poma 2020-04-29 18:55:54 +03:00
parent 782d425e24
commit ae122a0c8d
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GPG Key ID: BA20CB01FE165657
1 changed files with 15 additions and 3 deletions
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18
js/index.js
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@ -3,10 +3,22 @@ import("../pkg/index.js").catch(console.error);
async function main() {
const pkg = await import("../pkg/index.js")
console.log('Downloading previous contribution from /params.bin')
let params = await fetch('params.bin')
const params = await fetch('params.bin')
params = new Uint8Array(await params.arrayBuffer())
const entropy = new Uint8Array(32)
window.crypto.getRandomValues(entropy)
const userInput = prompt('Please enter some random symbols')
if (!userInput.length) {
throw new Error('Zero symbols entered')
}
const msgBuffer = new TextEncoder('utf-8').encode(userInput)
const hashBuffer = await window.crypto.subtle.digest('SHA-256', msgBuffer)
const entropyFromUser = new Uint8Array(hashBuffer)
const entropyFromBrowser = window.crypto.getRandomValues(new Uint8Array(32))
const entropy = new Uint8Array(entropyFromBrowser.length)
for (let i = 0; i < entropyFromBrowser.length; i++) {
entropy[i] = entropyFromBrowser[i] ^ entropyFromUser[i]
}
console.log('Contributing with entropy', entropy) // shouldn't be logged on prod
const result = pkg.contribute(params, entropy)
console.log('Your contribution', result)