HKDF Key Derivation Tool

Enter input keying material, salt, info, and output length using text or hexadecimal bytes and inspect exact output bytes.

Hash

Input format

Output bytes

Input keying material

Salt

Info

Derived key (hex)

Ready

All cryptographic operations run locally in your browser. Keep private keys secret and use production key-management practices for real systems.

RFC 5869 limits & test-vector verification

Audit hash/output-length boundaries, add Base64URL handoff and verify a standard SHA-256 HKDF vector locally.

Crypto evidence

Check	Value	Evidence

Browser-local cryptographic utilities

preserves the established Web Crypto workflows while connecting token, key, KDF, encryption/signature, fingerprint and verification jobs. Inputs stay in your browser unless the page clearly states that a network request is required.

Protocol boundary

Correct primitive output does not certify a complete protocol, key-management system, parameter choice, endpoint, or production deployment. Match the source system exactly and use established application/security libraries for production authentication and storage.