skills/docs/devtools/tooling/install-agent-skills/assets/skills/crypto-utils/SKILL.md

name: crypto-utils description: Use when implementing or debugging code that uses @suaveplan/crypto-utils: Shared cryptographic utilities: encoding (hex/base64/base64url/base58), byte helpers (concat/xor/i2osp/os2ip), constant-time equality, random bytes, zeroize, Merkle tree helpers, KAT/differential-fuzz test harnesses, PrimitiveId registry, PrimitiveNotImplemented error.

@suaveplan/crypto-utils

Shared cryptographic utilities consumed internally by all other @suaveplan/crypto-* packages. Provides the low-level primitives that every crypto implementation needs but that belong in one place: multi-alphabet encoding (toHex/fromHex, toBase64/fromBase64, toBase64Url, toBase58/fromBase58); byte helpers (concatBytes, xor, i2osp/os2ip for integer-to-octet-string conversions); constantTimeEqual for timing-safe comparisons; randomBytes with an injectable ByteSource; zeroize for wiping key material; Merkle tree helpers (merkleRoot, merkleProof, verifyMerkleProof); a PrimitiveId registry and PrimitiveNotImplemented sentinel error; and KAT/differential-fuzz harnesses (runVectors, diffFuzz) used in every crypto primitive's test suite. Zero runtime crypto dependencies — this package provides helpers only, not cryptographic algorithms. Application code should generally import from @suaveplan/crypto or @suaveplan/crypto-hash; import from this package only when building a new cryptographic primitive or engine adapter.

When to use this skill

• Implementing or debugging code that imports @suaveplan/crypto-utils.
• The task touches: see package README.
• You need API guidance for this package's exports.

Quick reference

import { /* see API Reference below */ } from "@suaveplan/crypto-utils";

Dependencies

Workspace dependencies: @suaveplan/bytes, @suaveplan/error, @suaveplan/types

Where to read more

This skill is intentionally short. The package's own documentation is the authoritative source — read these in order:

1. packages/crypto/crypto-utils/README.md — overview, install, quick-start, module index
2. packages/crypto/crypto-utils/src/**/*.md — co-located docs per implementation file (Purpose, Features, Basic + Advanced examples, full API reference, Implementation notes — all packages ship ≥200 words per module)
3. packages/crypto/crypto-utils/package.json exports map — every subpath you can import from

When the user asks an API question, read the relevant co-located .md first; do not answer from training-data memory.

See also

• @suaveplan/bytes
• @suaveplan/error
• @suaveplan/types

---

This SKILL.md is auto-generated by suaveplan-skills/scripts/generate-skills.ts from the package's README. Do not edit by hand — re-run the generator after the README changes.