4 * \brief SSL session cache implementation
7 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
8 * SPDX-License-Identifier: Apache-2.0
10 * Licensed under the Apache License, Version 2.0 (the "License"); you may
11 * not use this file except in compliance with the License.
12 * You may obtain a copy of the License at
14 * http://www.apache.org/licenses/LICENSE-2.0
16 * Unless required by applicable law or agreed to in writing, software
17 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
18 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
19 * See the License for the specific language governing permissions and
20 * limitations under the License.
22 * This file is part of mbed TLS (https://tls.mbed.org)
24 #ifndef MBEDTLS_SSL_CACHE_H
25 #define MBEDTLS_SSL_CACHE_H
27 #if !defined(MBEDTLS_CONFIG_FILE)
30 #include MBEDTLS_CONFIG_FILE
35 #if defined(MBEDTLS_THREADING_C)
36 #include "threading.h"
40 * \name SECTION: Module settings
42 * The configuration options you can set for this module are in this section.
43 * Either change them in config.h or define them on the compiler command line.
47 #if !defined(MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT)
48 #define MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT 86400 /*!< 1 day */
51 #if !defined(MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES)
52 #define MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES 50 /*!< Maximum entries in cache */
55 /* \} name SECTION: Module settings */
61 typedef struct mbedtls_ssl_cache_context mbedtls_ssl_cache_context;
62 typedef struct mbedtls_ssl_cache_entry mbedtls_ssl_cache_entry;
65 * \brief This structure is used for storing cache entries
67 struct mbedtls_ssl_cache_entry
69 #if defined(MBEDTLS_HAVE_TIME)
70 mbedtls_time_t timestamp; /*!< entry timestamp */
72 mbedtls_ssl_session session; /*!< entry session */
73 #if defined(MBEDTLS_X509_CRT_PARSE_C) && \
74 defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
75 mbedtls_x509_buf peer_cert; /*!< entry peer_cert */
77 mbedtls_ssl_cache_entry *next; /*!< chain pointer */
81 * \brief Cache context
83 struct mbedtls_ssl_cache_context
85 mbedtls_ssl_cache_entry *chain; /*!< start of the chain */
86 int timeout; /*!< cache entry timeout */
87 int max_entries; /*!< maximum entries */
88 #if defined(MBEDTLS_THREADING_C)
89 mbedtls_threading_mutex_t mutex; /*!< mutex */
94 * \brief Initialize an SSL cache context
96 * \param cache SSL cache context
98 void mbedtls_ssl_cache_init( mbedtls_ssl_cache_context *cache );
101 * \brief Cache get callback implementation
102 * (Thread-safe if MBEDTLS_THREADING_C is enabled)
104 * \param data SSL cache context
105 * \param session session to retrieve entry for
107 int mbedtls_ssl_cache_get( void *data, mbedtls_ssl_session *session );
110 * \brief Cache set callback implementation
111 * (Thread-safe if MBEDTLS_THREADING_C is enabled)
113 * \param data SSL cache context
114 * \param session session to store entry for
116 int mbedtls_ssl_cache_set( void *data, const mbedtls_ssl_session *session );
118 #if defined(MBEDTLS_HAVE_TIME)
120 * \brief Set the cache timeout
121 * (Default: MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT (1 day))
123 * A timeout of 0 indicates no timeout.
125 * \param cache SSL cache context
126 * \param timeout cache entry timeout in seconds
128 void mbedtls_ssl_cache_set_timeout( mbedtls_ssl_cache_context *cache, int timeout );
129 #endif /* MBEDTLS_HAVE_TIME */
132 * \brief Set the maximum number of cache entries
133 * (Default: MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES (50))
135 * \param cache SSL cache context
136 * \param max cache entry maximum
138 void mbedtls_ssl_cache_set_max_entries( mbedtls_ssl_cache_context *cache, int max );
141 * \brief Free referenced items in a cache context and clear memory
143 * \param cache SSL cache context
145 void mbedtls_ssl_cache_free( mbedtls_ssl_cache_context *cache );
151 #endif /* ssl_cache.h */