The V8 JavaScript Runtime Undermined My Constant-Time JavaScript Library
A developer reports that the V8 JavaScript engine’s just‑in‑time compilation and optimization mechanisms interfere with the timing guarantees of a constant‑time cryptographic library written in JavaScript. Benchmarks show that V8’s speculative optimizations introduce variable execution paths, potentially exposing side‑channel vulnerabilities. The author suggests mitigation strategies and calls for engine‑level support for true constant‑time operations in production environments.