ludic/docs/language/crypto/crypto-random_hex.md
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feat(stdlib): finish Crypto (CSPRNG + base64) and add Uuid.* library (#19 #16)
Crypto (#19): add the OS cryptographically-secure random surface
(random_bytes/random_hex/random_u32, reading /dev/urandom) and a standard
base64 encoder, completing the library alongside the existing SHA-256/
HMAC-SHA256/verify_hmac/hex/ct_equal. All pure integer IR, C-free.

Uuid (#16): a new namespace for stable, collision-free IDs — v4 (random) and
v7 (time-ordered) generation, plus parse/is_valid/to_text/equals/nil. UUIDs are
canonical lowercase 36-char strings; v4 and v7's random tail draw from the
crypto CSPRNG, so both carry the documented determinism caveat (mint at the
edges, never inside lockstep simulation). Reuses the crypto prelude's
fn_secure_bytes / fn_hex_encode.

- examples/library/{crypto,uuid}.ludic: known-answer vectors (SHA-256, HMAC,
  base64 per RFC 4231/4648) and structural invariants (uuid version/variant
  bits, parse/equals), wired into `x test` (now 51 passed).
- docs: per-symbol pages for every new method + a new Uuid section; inventory
  and impl-vs-docs coverage check pass.
- seed regenerated; `x bootstrap-cfree` fixpoint holds.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-30 21:40:51 +03:00

993 B

id name category kind tokens sig tip order ns member
crypto-random_hex Crypto.random_hex crypto namespace-method Crypto.random_hex Crypto.random_hex(n) -> string Alias for random_bytes — n secure bytes as a 2n-char hex string. 7 Crypto random_hex

Identical to Crypto.random_bytes: draws n bytes from the OS CSPRNG and returns them as a 2n-character lowercase hex string. The two names are interchangeable; random_hex exists so call sites can be explicit that the return value is already hex text (not raw bytes) when that reads more clearly. The same determinism caveat applies — the result is unpredictable by design and must stay out of the reproducible simulation RNG.

Parameters:

  • n — the number of secure random bytes to draw
program Nonce {
  entry {
    let nonce = Crypto.random_hex(12)   # 24 hex chars
    print(len(nonce))                    # 24
  }
}