Function hkdfWithInfo

hkdfWithInfo(
    ikm: Uint8Array,
    salt: Uint8Array,
    info: string,
    length: number,
): Promise<Uint8Array>
String-info convenience wrapper around hkdf.

Encodes info as UTF-8 before passing to hkdf.
Parameters
- ikm: Uint8Array
  Input key material.
- salt: Uint8Array
  Salt (may be empty).
- info: string
  UTF-8 string used as the info/context parameter.
- length: number
  Output bytes (max 8160).
Returns Promise<Uint8Array>
The derived key material.
Throws
On the same conditions as hkdf.
Example
```
const sessionKey = await hkdfWithInfo(masterSecret, salt,
  'me2em/crypto/v1/session-key', 32);
```
- Defined in packages/crypto/src/core/hkdf.ts:87