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/*
* Copyright 2023 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#ifndef OSSL_INTERNAL_QUIC_SRT_GEN_H
# define OSSL_INTERNAL_QUIC_SRT_GEN_H
# pragma once
# include "internal/e_os.h"
# include "internal/time.h"
# include "internal/quic_types.h"
# include "internal/quic_wire.h"
# ifndef OPENSSL_NO_QUIC
/*
* QUIC Stateless Reset Token Generator
* ====================================
*
* This generates 16-byte QUIC Stateless Reset Tokens given a secret symmetric
* key and a DCID. Because the output is deterministic with regards to these
* inputs, assuming the same key is used between invocations of a process, we
* are able to generate the same stateless reset token in a subsequent process,
* thereby allowing us to achieve stateless reset of a peer which still thinks
* it is connected to a past process at the same UDP address.
*/
typedef struct quic_srt_gen_st QUIC_SRT_GEN;
/*
* Create a new stateless reset token generator using the given key as input.
* The key may be of arbitrary length.
*
* The caller is responsible for performing domain separation with regards to
* the key; i.e., the caller is responsible for ensuring the key is never used
* in any other context.
*/
QUIC_SRT_GEN *ossl_quic_srt_gen_new(OSSL_LIB_CTX *libctx, const char *propq,
const unsigned char *key, size_t key_len);
/* Free the stateless reset token generator. No-op if srt_gen is NULL. */
void ossl_quic_srt_gen_free(QUIC_SRT_GEN *srt_gen);
/*
* Calculates a token using the given DCID and writes it to *token. Returns 0 on
* failure.
*/
int ossl_quic_srt_gen_calculate_token(QUIC_SRT_GEN *srt_gen,
const QUIC_CONN_ID *dcid,
QUIC_STATELESS_RESET_TOKEN *token);
# endif
#endif
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