public void init(byte[] encapsulated, PrivateKey recipientKey, byte[] info)
            throws InvalidKeyException {
        spi.engineInitRecipient(encapsulated, recipientKey, info, null,
                HpkeSpi.DEFAULT_PSK, HpkeSpi.DEFAULT_PSK_ID);
    }
Initialises this HpkeContextRecipient in BASE mode, i.e. no sender authentication.

@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
@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