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/**
* \file ssl_cookie.h
*
* \brief DTLS cookie callbacks implementation
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
*/
#ifndef MBEDTLS_SSL_COOKIE_H
#define MBEDTLS_SSL_COOKIE_H
#include "mbedtls/private_access.h"
#include "mbedtls/build_info.h"
#include "mbedtls/ssl.h"
#if !defined(MBEDTLS_USE_PSA_CRYPTO)
#if defined(MBEDTLS_THREADING_C)
#include "mbedtls/threading.h"
#endif
#endif /* !MBEDTLS_USE_PSA_CRYPTO */
/**
* \name SECTION: Module settings
*
* The configuration options you can set for this module are in this section.
* Either change them in mbedtls_config.h or define them on the compiler command line.
* \{
*/
#ifndef MBEDTLS_SSL_COOKIE_TIMEOUT
#define MBEDTLS_SSL_COOKIE_TIMEOUT 60 /**< Default expiration delay of DTLS cookies, in seconds if HAVE_TIME, or in number of cookies issued */
#endif
/** \} name SECTION: Module settings */
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief Context for the default cookie functions.
*/
typedef struct mbedtls_ssl_cookie_ctx {
#if defined(MBEDTLS_USE_PSA_CRYPTO)
mbedtls_svc_key_id_t MBEDTLS_PRIVATE(psa_hmac_key); /*!< key id for the HMAC portion */
psa_algorithm_t MBEDTLS_PRIVATE(psa_hmac_alg); /*!< key algorithm for the HMAC portion */
#else
mbedtls_md_context_t MBEDTLS_PRIVATE(hmac_ctx); /*!< context for the HMAC portion */
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if !defined(MBEDTLS_HAVE_TIME)
unsigned long MBEDTLS_PRIVATE(serial); /*!< serial number for expiration */
#endif
unsigned long MBEDTLS_PRIVATE(timeout); /*!< timeout delay, in seconds if HAVE_TIME,
or in number of tickets issued */
#if !defined(MBEDTLS_USE_PSA_CRYPTO)
#if defined(MBEDTLS_THREADING_C)
mbedtls_threading_mutex_t MBEDTLS_PRIVATE(mutex);
#endif
#endif /* !MBEDTLS_USE_PSA_CRYPTO */
} mbedtls_ssl_cookie_ctx;
/**
* \brief Initialize cookie context
*/
void mbedtls_ssl_cookie_init(mbedtls_ssl_cookie_ctx *ctx);
/**
* \brief Setup cookie context (generate keys)
*/
int mbedtls_ssl_cookie_setup(mbedtls_ssl_cookie_ctx *ctx,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng);
/**
* \brief Set expiration delay for cookies
* (Default MBEDTLS_SSL_COOKIE_TIMEOUT)
*
* \param ctx Cookie context
* \param delay Delay, in seconds if HAVE_TIME, or in number of cookies
* issued in the meantime.
* 0 to disable expiration (NOT recommended)
*/
void mbedtls_ssl_cookie_set_timeout(mbedtls_ssl_cookie_ctx *ctx, unsigned long delay);
/**
* \brief Free cookie context
*/
void mbedtls_ssl_cookie_free(mbedtls_ssl_cookie_ctx *ctx);
/**
* \brief Generate cookie, see \c mbedtls_ssl_cookie_write_t
*/
mbedtls_ssl_cookie_write_t mbedtls_ssl_cookie_write;
/**
* \brief Verify cookie, see \c mbedtls_ssl_cookie_write_t
*/
mbedtls_ssl_cookie_check_t mbedtls_ssl_cookie_check;
#ifdef __cplusplus
}
#endif
#endif /* ssl_cookie.h */
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