feat: zero-access key-hierarchy primitives (password KDF, key-wrap records, nmcs1 stream) - #14
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…cords, nmcs1 stream) Add three capabilities that the artifact-studio zero-access encryption program builds on: - @nestm/crypto/password: registry-based scrypt KDF with absolute parameter ceilings and a hard maxmem cap, canonical versioned params codec, and recovery codes (Crockford base32, checksum-padded groups). - @nestm/crypto/keys: KeyWrapRecord (A256GCMKW secret wraps + X25519 sealed boxes) with recipient-identity-bound AAD and length-checked unwrap, plus hmacSha256 / timingSafeEqualBytes. - @nestm/crypto/stream: the nmcs1 chunked AEAD container (fixed 512B header, per-chunk HKDF-derived keys/nonces from a per-object random fileId, truncation/ reorder/splice/header-tamper resistant, buffered + Web-stream APIs). fileId is a testing-only seam, never a public option, so nonce reuse cannot be caused by a caller. Also export isCipherEnvelope from ./core. No new runtime deps; ESM-only.
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Groundwork for the artifact-studio zero-access encryption program. Left open intentionally for comparison against an alternative implementation — do not merge yet.
What
@nestm/crypto/password— registry-based scrypt KDF (absolute param ceilings + hard maxmem cap, versioned canonical params codec) and recovery codes (Crockford base32, checksum-padded groups).@nestm/crypto/keys—KeyWrapRecord(A256GCMKW secret wraps + X25519 sealed boxes) with recipient-identity-bound AAD and length-checked unwrap;hmacSha256/timingSafeEqualBytes.@nestm/crypto/stream— thenmcs1chunked AEAD container: fixed 512-byte header, per-chunk keys/nonces from a per-object randomfileId; truncation/reorder/splice/header-tamper resistant; buffered + Web-stream APIs.fileIdis a testing-only seam, never public.isCipherEnvelopeexported from./core. No new runtime deps; ESM-only.Security review
A 15-agent adversarial review found 1 critical (public
fileId→ keystream reuse) + 13 high; all fixed and re-verified, plus two extra hardening fixes. Frozen wire vectors added.Verification
pnpm test251 passed ·check·build·check-package·test:packed— all green.