Function wrap_onionreply

common/sphinx.c:738–757

}

struct onionreply *wrap_onionreply(const tal_t *ctx,
				   const struct secret *shared_secret,
				   const struct onionreply *reply)
{
	struct secret key;
	struct onionreply *result = tal(ctx, struct onionreply);

	/* BOLT #4:
	 *
	 * The erring node then generates a new key, using the key type `ammag`.
	 * This key is then used to generate a pseudo-random stream, which is
	 * in turn applied to the packet using `XOR`.
	 *
	 * The obfuscation step is repeated by every hop along the return path.
	 */
	subkey_from_hmac("ammag", shared_secret, &key);
	result->contents = tal_dup_talarr(result, u8, reply->contents);
	xor_cipher_stream(result->contents, &key, tal_bytelen(result->contents));
	return result;
}

u8 *unwrap_onionreply(const tal_t *ctx,
		      const struct secret *shared_secrets,