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shuffle: Use cryptographic randomness to generate permutation #121

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shuffle: Use cryptographic randomness to generate permutation #121

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5 changes: 3 additions & 2 deletions src/crypto/shuffle.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,5 @@
import { RP, random_bigint } from './curve'
import { pick_random_bigint } from './pick-random-bigint'
import { Shuffle_Proof, generate_shuffle_proof } from './shuffle-proof'

export type Cipher = { encrypted: RP; lock: RP }
Expand Down Expand Up @@ -45,12 +46,12 @@ export async function shuffle(
return { proof, shuffled }
}

/** Generates an array of all integers up to `size`, in a random order */
/** Generates an array of all integers up to `size`, in a random order, using cryptographic randomness */
function build_permutation_array(size: number) {
const array: number[] = []
const options = [...new Array(size).keys()]
while (options.length) {
const i = Math.floor(Math.random() * options.length)
const i = Number(pick_random_bigint(BigInt(options.length + 1))) - 1
array.push(options.splice(i, 1)[0])
}
return array
Expand Down