2.4 KiB
Architecture
Random Tools is a static React/Vite application wrapped in the shared Toolbox shell. random/source.ts exposes one common interface over two deliberately distinct local sources: browser WebCrypto with rejection-sampled integers, and the versioned toolbox-helpers xoshiro128** seeded generator. Secure mode never falls back to deterministic mode.
random/generators.ts builds bounded numbers, strings, identifiers, dice, samples, shuffles, passphrases and normal samples on that interface. random/draws.ts adds local binary coin flips, standard playing-card deals, shuffled inclusive integer sequences, Gregorian calendar-date sampling, exact decimal-digit fractions and equal-area points on a spherical surface model. Date sampling can filter weekdays and use a partial Fisher–Yates mapping for selection without replacement; it does not allocate every date in a large range.
random/weighted.ts parses bounded two-column quoted CSV and ranks each item by an exponential-race key, yielding an exact weighted sample without replacement. random/recipes.ts validates a 2 MiB, schema-versioned executable recipe and runs it only through the deterministic source; every algorithm then applies its normal count/list/alphabet bounds. Recipe output includes the generator identity and state after execution.
random/ceremony.ts creates 32-byte WebCrypto reveal nonces. A SHA-256 commitment is domain-separated and binds the normalized ceremony ID, participant name and canonical unpadded Base64url nonce. Finalization validates every commitment, rejects duplicate/missing/changed entries, sorts normalized participant names by a locale-independent code-unit order, and hashes the complete verified reveal set under a separate final-seed domain. It cannot enforce the social publication order.
Each successful result includes source identity, parameters and deterministic state where applicable. Most operations are synchronous and bounded; custom word-list identity and ceremony hashes use the asynchronous browser Web Crypto digest API without a worker. Custom lists are trimmed, emptied lines are dropped and uniqueness is checked once before both selection and metadata are derived. Weighted input is capped at 100,000 items/4,000,000 UTF-16 units; recipes and ceremony documents at 2 MiB; ceremonies at 1,000 participants. The application contains no third-party network client; its CSP limits connections to its own origin for loading the local application shell.