Function deriveKey

deriveKey(
    ikm: Uint8Array,
    salt: string | Uint8Array<ArrayBufferLike>,
    info: string | Uint8Array<ArrayBufferLike>,
): Uint8Array
Derive a 32-byte key using HKDF-SHA256 (RFC 5869).

This is a convenience wrapper around the full HKDF function, fixed to SHA-256 and a 32-byte output length — suitable for deriving symmetric encryption keys.
Parameters
- ikm: Uint8Array
  Input keying material (e.g. a shared secret or master key).
- salt: string | Uint8Array<ArrayBufferLike>
  Salt value (string or bytes). Use a unique, application-specific salt.
- info: string | Uint8Array<ArrayBufferLike>
  Context/application-specific info string (string or bytes).
Returns Uint8Array
A 32-byte derived key as Uint8Array.
Example
```
import { deriveKey, randomBytes } from "@polkadot-apps/crypto";

const masterKey = randomBytes(32);
const encryptionKey = deriveKey(masterKey, "myapp-v1", "document-encryption");
```
- Defined in packages/crypto/src/hkdf.ts:29