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perf(nodejs): introduce pool into default rng #513

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merged 3 commits into from
Aug 29, 2020
Merged

perf(nodejs): introduce pool into default rng #513

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perf(nodejs): introduce pool into default rng
puzpuzpuz Aug 27, 2020
b73e4ab
fixup! address review comments
puzpuzpuz Aug 28, 2020
742b9a8
fixup! address review comments
puzpuzpuz Aug 29, 2020
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10 changes: 8 additions & 2 deletions src/rng.js
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Original file line number Diff line number Diff line change
@@ -1,7 +1,13 @@
import crypto from 'crypto';

const rnds8 = new Uint8Array(16);
const poolSize = 16;
const rnds8Pool = new Uint8Array(16 * poolSize);
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let poolPtr = rnds8Pool.length;

export default function rng() {
return crypto.randomFillSync(rnds8);
if (poolPtr > rnds8Pool.length - 16) {
crypto.randomFillSync(rnds8Pool);
poolPtr = 0;
}
return rnds8Pool.slice(poolPtr, (poolPtr += 16));
}