Function derivePSKAtCounter

derivePSKAtCounter(initialPSK: Uint8Array, counter: number): Uint8Array
Derives the PSK for a specific counter value using the two-level ratchet.
Parameters
- initialPSK: Uint8Array
  The shared pre-shared key (32 bytes)
- counter: number
  The ratchet counter
Returns Uint8Array
32-byte derived PSK for this counter
- Defined in src/psk/ratchet.ts:50