HKDF Key Derivation - Free Online Tool | PivaBox

Derive cryptographic keys using HKDF (RFC 5869) — extract-then-expand with configurable salt and info

How to Use HKDF Key Derivation

1. Enter your Input Key Material (IKM) in Hex or Base64 format
2. Set an optional salt and info context, then choose your hash algorithm and output key length
3. Click Generate to derive the key — the result can be verified against expected values

Frequently Asked Questions

What is HKDF used for?

HKDF (RFC 5869) is used to derive multiple cryptographic keys from a single master secret. It is commonly used in TLS 1.3, Signal Protocol, and other secure systems.

Is the salt required?

Salt is optional but recommended. It prevents an attacker from using precomputed tables against the IKM and ensures different derived keys even with the same IKM.

Is this tool free?

Yes, completely free. All key derivation runs in your browser using the Web Crypto API.