public void init(byte[] encapsulated, PrivateKey recipientKey, byte[] info,
            byte[] psk, byte[] psk_id) throws InvalidKeyException {
        spi.engineInitRecipient(encapsulated, recipientKey, info, null, psk, psk_id);
    }
Initialises this HpkeContextRecipient in PSK_AUTH mode, i.e. messages are authenticated using
a pre-shared secret key.

@param encapsulated encapsulated ephemeral key from an {@link HpkeContextSender}
@param recipientKey private key of the recipient
@param info application-supplied information, may be null or empty
@param psk the a pre-shared secret key
@param psk_id the id of the pre-shared secret key
@throws NullPointerException if psk or psk_id are null
@throws InvalidKeyException if recipientKey is null or an unsupported key format
@throws UnsupportedOperationException if mode is not a supported HPKE mode
@throws IllegalStateException if this HpkeContextRecipient has already been initialised
common/src/main/java/org/conscrypt/HpkeContextRecipient.java