ssl - OpenSSL SSL/TLS library
See the individual manual pages for details.
The OpenSSL ssl library implements the Secure Sockets Layer
(SSL v2/v3) and Transport Layer Security (TLS v1) protocols. It provides a
rich API which is documented here.
An SSL_CTX object is created as a framework to establish
TLS/SSL enabled connections (see SSL_CTX_new(3)). Various options
regarding certificates, algorithms etc. can be set in this object.
When a network connection has been created, it can be assigned to
an SSL object. After the SSL object has been created using
SSL_new(3), SSL_set_fd(3) or SSL_set_bio(3) can be used
to associate the network connection with the object.
When the TLS/SSL handshake is performed using SSL_accept(3)
or SSL_connect(3) respectively. SSL_read_ex(3),
SSL_read(3), SSL_write_ex(3) and SSL_write(3) are used
to read and write data on the TLS/SSL connection. SSL_shutdown(3) can
be used to shut down the TLS/SSL connection.
Currently the OpenSSL ssl library functions deals with the
following data structures:
- SSL_METHOD
(SSL Method)
- This is a dispatch structure describing the internal ssl library
methods/functions which implement the various protocol versions (SSLv3
TLSv1, ...). It's needed to create an SSL_CTX.
- SSL_CIPHER
(SSL Cipher)
- This structure holds the algorithm information for a particular cipher
which are a core part of the SSL/TLS protocol. The available ciphers are
configured on a SSL_CTX basis and the actual ones used are then
part of the SSL_SESSION.
- SSL_CTX (SSL
Context)
- This is the global context structure which is created by a server or
client once per program life-time and which holds mainly default values
for the SSL structures which are later created for the
connections.
- SSL_SESSION
(SSL Session)
- This is a structure containing the current TLS/SSL session details for a
connection: SSL_CIPHERs, client and server certificates, keys,
etc.
- SSL (SSL
Connection)
- This is the main SSL/TLS structure which is created by a server or client
per established connection. This actually is the core structure in the SSL
API. At run-time the application usually deals with this structure which
has links to mostly all other structures.
Currently the OpenSSL ssl library provides the following C
header files containing the prototypes for the data structures and
functions:
- ssl.h
- This is the common header file for the SSL/TLS API. Include it into your
program to make the API of the ssl library available. It internally
includes both more private SSL headers and headers from the crypto
library. Whenever you need hard-core details on the internals of the SSL
API, look inside this header file.
- ssl2.h
- Unused. Present for backwards compatibility only.
- ssl3.h
- This is the sub header file dealing with the SSLv3 protocol only.
Usually you don't have to include it explicitly because it's
already included by ssl.h.
- tls1.h
- This is the sub header file dealing with the TLSv1 protocol only.
Usually you don't have to include it explicitly because it's
already included by ssl.h.
Currently the OpenSSL ssl library exports 214 API
functions. They are documented in the following:
Here we document the various API functions which deal with the
SSL/TLS protocol context defined in the SSL_CTX structure.
- int
SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x);
- long
SSL_CTX_add_extra_chain_cert(SSL_CTX *ctx, X509 *x509);
- int
SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c);
- int
SSL_CTX_check_private_key(const SSL_CTX *ctx);
- long
SSL_CTX_ctrl(SSL_CTX *ctx, int cmd, long larg, char *parg);
- void
SSL_CTX_flush_sessions(SSL_CTX *s, long t);
- void
SSL_CTX_free(SSL_CTX *a);
- char
*SSL_CTX_get_app_data(SSL_CTX *ctx);
- X509_STORE
*SSL_CTX_get_cert_store(SSL_CTX *ctx);
- STACK
*SSL_CTX_get_ciphers(const SSL_CTX *ctx);
- STACK
*SSL_CTX_get_client_CA_list(const SSL_CTX *ctx);
- int
(*SSL_CTX_get_client_cert_cb(SSL_CTX *ctx))(SSL *ssl, X509 **x509,
EVP_PKEY **pkey);
- void
SSL_CTX_get_default_read_ahead(SSL_CTX *ctx);
- char
*SSL_CTX_get_ex_data(const SSL_CTX *s, int idx);
- int
SSL_CTX_get_ex_new_index(long argl, char *argp, int
(*new_func);(void), int (*dup_func)(void), void (*free_func)(void))
- void
(*SSL_CTX_get_info_callback(SSL_CTX *ctx))(SSL *ssl, int cb, int
ret);
- int
SSL_CTX_get_quiet_shutdown(const SSL_CTX *ctx);
- void
SSL_CTX_get_read_ahead(SSL_CTX *ctx);
- int
SSL_CTX_get_session_cache_mode(SSL_CTX *ctx);
- long
SSL_CTX_get_timeout(const SSL_CTX *ctx);
- int
(*SSL_CTX_get_verify_callback(const SSL_CTX *ctx))(int ok,
X509_STORE_CTX *ctx);
- int
SSL_CTX_get_verify_mode(SSL_CTX *ctx);
- int
SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile, const
char *CApath);
- SSL_CTX
*SSL_CTX_new(const SSL_METHOD *meth);
- int SSL_CTX_up_ref(SSL_CTX
*ctx);
- int
SSL_CTX_remove_session(SSL_CTX *ctx, SSL_SESSION *c);
- int
SSL_CTX_sess_accept(SSL_CTX *ctx);
- int
SSL_CTX_sess_accept_good(SSL_CTX *ctx);
- int
SSL_CTX_sess_accept_renegotiate(SSL_CTX *ctx);
- int
SSL_CTX_sess_cache_full(SSL_CTX *ctx);
- int
SSL_CTX_sess_cb_hits(SSL_CTX *ctx);
- int
SSL_CTX_sess_connect(SSL_CTX *ctx);
- int
SSL_CTX_sess_connect_good(SSL_CTX *ctx);
- int
SSL_CTX_sess_connect_renegotiate(SSL_CTX *ctx);
- int
SSL_CTX_sess_get_cache_size(SSL_CTX *ctx);
- SSL_SESSION
*(*SSL_CTX_sess_get_get_cb(SSL_CTX *ctx))(SSL *ssl, unsigned char
*data, int len, int *copy);
- int
(*SSL_CTX_sess_get_new_cb(SSL_CTX *ctx)(SSL *ssl, SSL_SESSION
*sess);
- void
(*SSL_CTX_sess_get_remove_cb(SSL_CTX *ctx)(SSL_CTX *ctx, SSL_SESSION
*sess);
- int
SSL_CTX_sess_hits(SSL_CTX *ctx);
- int
SSL_CTX_sess_misses(SSL_CTX *ctx);
- int
SSL_CTX_sess_number(SSL_CTX *ctx);
- void
SSL_CTX_sess_set_cache_size(SSL_CTX *ctx, t);
- void
SSL_CTX_sess_set_get_cb(SSL_CTX *ctx, SSL_SESSION *(*cb)(SSL *ssl,
unsigned char *data, int len, int *copy));
- void
SSL_CTX_sess_set_new_cb(SSL_CTX *ctx, int (*cb)(SSL *ssl, SSL_SESSION
*sess));
- void
SSL_CTX_sess_set_remove_cb(SSL_CTX *ctx, void (*cb)(SSL_CTX *ctx,
SSL_SESSION *sess));
- int
SSL_CTX_sess_timeouts(SSL_CTX *ctx);
- LHASH
*SSL_CTX_sessions(SSL_CTX *ctx);
- int
SSL_CTX_set_app_data(SSL_CTX *ctx, void *arg);
- void
SSL_CTX_set_cert_store(SSL_CTX *ctx, X509_STORE *cs);
- void
SSL_CTX_set1_cert_store(SSL_CTX *ctx, X509_STORE *cs);
- void
SSL_CTX_set_cert_verify_cb(SSL_CTX *ctx, int (*cb)(), char
*arg)
- int
SSL_CTX_set_cipher_list(SSL_CTX *ctx, char *str);
- void
SSL_CTX_set_client_CA_list(SSL_CTX *ctx, STACK *list);
- void
SSL_CTX_set_client_cert_cb(SSL_CTX *ctx, int (*cb)(SSL *ssl, X509
**x509, EVP_PKEY **pkey));
- int
SSL_CTX_set_ct_validation_callback(SSL_CTX *ctx, ssl_ct_validation_cb
callback, void *arg);
- void
SSL_CTX_set_default_passwd_cb(SSL_CTX *ctx, int
(*cb);(void))
- void
SSL_CTX_set_default_read_ahead(SSL_CTX *ctx, int m);
- int
SSL_CTX_set_default_verify_paths(SSL_CTX *ctx);
- Use the default paths to locate trusted CA certificates. There is one
default directory path and one default file path. Both are set via this
call.
- int
SSL_CTX_set_default_verify_dir(SSL_CTX *ctx)
- Use the default directory path to locate trusted CA certificates.
- int
SSL_CTX_set_default_verify_file(SSL_CTX *ctx)
- Use the file path to locate trusted CA certificates.
- int
SSL_CTX_set_ex_data(SSL_CTX *s, int idx, char *arg);
- void
SSL_CTX_set_info_callback(SSL_CTX *ctx, void (*cb)(SSL *ssl, int cb,
int ret));
- void
SSL_CTX_set_msg_callback(SSL_CTX *ctx, void (*cb)(int write_p, int
version, int content_type, const void *buf, size_t len, SSL *ssl, void
*arg));
- void
SSL_CTX_set_msg_callback_arg(SSL_CTX *ctx, void *arg);
- unsigned long
SSL_CTX_clear_options(SSL_CTX *ctx, unsigned long op);
- unsigned long
SSL_CTX_get_options(SSL_CTX *ctx);
- unsigned long
SSL_CTX_set_options(SSL_CTX *ctx, unsigned long op);
- void
SSL_CTX_set_quiet_shutdown(SSL_CTX *ctx, int mode);
- void
SSL_CTX_set_read_ahead(SSL_CTX *ctx, int m);
- void
SSL_CTX_set_session_cache_mode(SSL_CTX *ctx, int mode);
- int
SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD
*meth);
- void
SSL_CTX_set_timeout(SSL_CTX *ctx, long t);
- long
SSL_CTX_set_tmp_dh(SSL_CTX* ctx, DH *dh);
- long
SSL_CTX_set_tmp_dh_callback(SSL_CTX *ctx, DH *(*cb)(void));
- void
SSL_CTX_set_verify(SSL_CTX *ctx, int mode, int (*cb);(void))
- int
SSL_CTX_use_PrivateKey(SSL_CTX *ctx, EVP_PKEY *pkey);
- int
SSL_CTX_use_PrivateKey_ASN1(int type, SSL_CTX *ctx, unsigned char *d,
long len);
- int
SSL_CTX_use_PrivateKey_file(SSL_CTX *ctx, const char *file, int
type);
- int
SSL_CTX_use_RSAPrivateKey(SSL_CTX *ctx, RSA *rsa);
- int
SSL_CTX_use_RSAPrivateKey_ASN1(SSL_CTX *ctx, unsigned char *d, long
len);
- int
SSL_CTX_use_RSAPrivateKey_file(SSL_CTX *ctx, const char *file, int
type);
- int
SSL_CTX_use_certificate(SSL_CTX *ctx, X509 *x);
- int
SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, int len, unsigned char
*d);
- int
SSL_CTX_use_certificate_file(SSL_CTX *ctx, const char *file, int
type);
- int
SSL_CTX_use_cert_and_key(SSL_CTX *ctx, X509 *x, EVP_PKEY *pkey,
STACK_OF(X509) *chain, int override);
- X509
*SSL_CTX_get0_certificate(const SSL_CTX *ctx);
- EVP_PKEY
*SSL_CTX_get0_privatekey(const SSL_CTX *ctx);
- void
SSL_CTX_set_psk_client_callback(SSL_CTX *ctx, unsigned int
(*callback)(SSL *ssl, const char *hint, char *identity, unsigned int
max_identity_len, unsigned char *psk, unsigned int max_psk_len));
- int
SSL_CTX_use_psk_identity_hint(SSL_CTX *ctx, const char
*hint);
- void
SSL_CTX_set_psk_server_callback(SSL_CTX *ctx, unsigned int
(*callback)(SSL *ssl, const char *identity, unsigned char *psk, int
max_psk_len));
Here we document the various API functions which deal with the
SSL/TLS sessions defined in the SSL_SESSION structures.
- int
SSL_SESSION_cmp(const SSL_SESSION *a, const SSL_SESSION *b);
- void
SSL_SESSION_free(SSL_SESSION *ss);
- char
*SSL_SESSION_get_app_data(SSL_SESSION *s);
- char
*SSL_SESSION_get_ex_data(const SSL_SESSION *s, int idx);
- int
SSL_SESSION_get_ex_new_index(long argl, char *argp, int
(*new_func);(void), int (*dup_func)(void), void (*free_func)(void))
- long
SSL_SESSION_get_time(const SSL_SESSION *s);
- long
SSL_SESSION_get_timeout(const SSL_SESSION *s);
- unsigned long
SSL_SESSION_hash(const SSL_SESSION *a);
- SSL_SESSION
*SSL_SESSION_new(void);
- int
SSL_SESSION_print(BIO *bp, const SSL_SESSION *x);
- int
SSL_SESSION_print_fp(FILE *fp, const SSL_SESSION *x);
- int
SSL_SESSION_set_app_data(SSL_SESSION *s, char *a);
- int
SSL_SESSION_set_ex_data(SSL_SESSION *s, int idx, char *arg);
- long
SSL_SESSION_set_time(SSL_SESSION *s, long t);
- long
SSL_SESSION_set_timeout(SSL_SESSION *s, long t);
Here we document the various API functions which deal with the
SSL/TLS connection defined in the SSL structure.
- int SSL_accept(SSL
*ssl);
- int
SSL_add_dir_cert_subjects_to_stack(STACK *stack, const char
*dir);
- int
SSL_add_file_cert_subjects_to_stack(STACK *stack, const char
*file);
- int
SSL_add_client_CA(SSL *ssl, X509 *x);
- char
*SSL_alert_desc_string(int value);
- char
*SSL_alert_desc_string_long(int value);
- char
*SSL_alert_type_string(int value);
- char
*SSL_alert_type_string_long(int value);
- int
SSL_check_private_key(const SSL *ssl);
- void
SSL_clear(SSL *ssl);
- long
SSL_clear_num_renegotiations(SSL *ssl);
- int SSL_connect(SSL
*ssl);
- int
SSL_copy_session_id(SSL *t, const SSL *f);
- Sets the session details for t to be the same as in f.
Returns 1 on success or 0 on failure.
- long SSL_ctrl(SSL
*ssl, int cmd, long larg, char *parg);
- int
SSL_do_handshake(SSL *ssl);
- SSL *SSL_dup(SSL
*ssl);
- SSL_dup() allows applications to configure an SSL handle for use in
multiple SSL connections, and then duplicate it prior to initiating each
connection with the duplicated handle. Use of SSL_dup() avoids the
need to repeat the configuration of the handles for each connection.
For SSL_dup() to work, the connection MUST be in its
initial state and MUST NOT have not yet have started the SSL handshake.
For connections that are not in their initial state SSL_dup()
just increments an internal reference count and returns the same
handle. It may be possible to use SSL_clear(3) to recycle an SSL
handle that is not in its initial state for re-use, but this is best
avoided. Instead, save and restore the session, if desired, and
construct a fresh handle for each connection.
- STACK
*SSL_dup_CA_list(STACK *sk);
- void SSL_free(SSL
*ssl);
- SSL_CTX
*SSL_get_SSL_CTX(const SSL *ssl);
- char
*SSL_get_app_data(SSL *ssl);
- X509
*SSL_get_certificate(const SSL *ssl);
- const char
*SSL_get_cipher(const SSL *ssl);
- int
SSL_is_dtls(const SSL *ssl);
- int
SSL_get_cipher_bits(const SSL *ssl, int *alg_bits);
- char
*SSL_get_cipher_list(const SSL *ssl, int n);
- char
*SSL_get_cipher_name(const SSL *ssl);
- char
*SSL_get_cipher_version(const SSL *ssl);
- STACK
*SSL_get_ciphers(const SSL *ssl);
- STACK
*SSL_get_client_CA_list(const SSL *ssl);
- SSL_CIPHER
*SSL_get_current_cipher(SSL *ssl);
- long
SSL_get_default_timeout(const SSL *ssl);
- int
SSL_get_error(const SSL *ssl, int i);
- char
*SSL_get_ex_data(const SSL *ssl, int idx);
- int
SSL_get_ex_data_X509_STORE_CTX_idx(void);
- int
SSL_get_ex_new_index(long argl, char *argp, int (*new_func);(void),
int (*dup_func)(void), void (*free_func)(void))
- int
SSL_get_fd(const SSL *ssl);
- void
(*SSL_get_info_callback(const SSL *ssl);)()
- int
SSL_get_key_update_type(SSL *s);
- STACK
*SSL_get_peer_cert_chain(const SSL *ssl);
- X509
*SSL_get_peer_certificate(const SSL *ssl);
- const STACK_OF(SCT)
*SSL_get0_peer_scts(SSL *s);
- EVP_PKEY
*SSL_get_privatekey(const SSL *ssl);
- int
SSL_get_quiet_shutdown(const SSL *ssl);
- BIO *SSL_get_rbio(const
SSL *ssl);
- int
SSL_get_read_ahead(const SSL *ssl);
- SSL_SESSION
*SSL_get_session(const SSL *ssl);
- char
*SSL_get_shared_ciphers(const SSL *ssl, char *buf, int
size);
- int
SSL_get_shutdown(const SSL *ssl);
- const SSL_METHOD
*SSL_get_ssl_method(SSL *ssl);
- int
SSL_get_state(const SSL *ssl);
- long
SSL_get_time(const SSL *ssl);
- long
SSL_get_timeout(const SSL *ssl);
- int
(*SSL_get_verify_callback(const SSL *ssl))(int, X509_STORE_CTX
*)
- int
SSL_get_verify_mode(const SSL *ssl);
- long
SSL_get_verify_result(const SSL *ssl);
- char
*SSL_get_version(const SSL *ssl);
- BIO
*SSL_get_wbio(const SSL *ssl);
- int
SSL_in_accept_init(SSL *ssl);
- int
SSL_in_before(SSL *ssl);
- int
SSL_in_connect_init(SSL *ssl);
- int SSL_in_init(SSL
*ssl);
- int
SSL_is_init_finished(SSL *ssl);
- int
SSL_key_update(SSL *s, int updatetype);
- STACK
*SSL_load_client_CA_file(const char *file);
- SSL *SSL_new(SSL_CTX
*ctx);
- int SSL_up_ref(SSL
*s);
- long
SSL_num_renegotiations(SSL *ssl);
- int SSL_peek(SSL
*ssl, void *buf, int num);
- int
SSL_pending(const SSL *ssl);
- int SSL_read(SSL
*ssl, void *buf, int num);
- int
SSL_renegotiate(SSL *ssl);
- char
*SSL_rstate_string(SSL *ssl);
- char
*SSL_rstate_string_long(SSL *ssl);
- long
SSL_session_reused(SSL *ssl);
- void
SSL_set_accept_state(SSL *ssl);
- void
SSL_set_app_data(SSL *ssl, char *arg);
- void
SSL_set_bio(SSL *ssl, BIO *rbio, BIO *wbio);
- int
SSL_set_cipher_list(SSL *ssl, char *str);
- void
SSL_set_client_CA_list(SSL *ssl, STACK *list);
- void
SSL_set_connect_state(SSL *ssl);
- int
SSL_set_ct_validation_callback(SSL *ssl, ssl_ct_validation_cb
callback, void *arg);
- int
SSL_set_ex_data(SSL *ssl, int idx, char *arg);
- int SSL_set_fd(SSL
*ssl, int fd);
- void
SSL_set_info_callback(SSL *ssl, void (*cb);(void))
- void
SSL_set_msg_callback(SSL *ctx, void (*cb)(int write_p, int version,
int content_type, const void *buf, size_t len, SSL *ssl, void
*arg));
- void
SSL_set_msg_callback_arg(SSL *ctx, void *arg);
- unsigned long
SSL_clear_options(SSL *ssl, unsigned long op);
- unsigned long
SSL_get_options(SSL *ssl);
- unsigned long
SSL_set_options(SSL *ssl, unsigned long op);
- void
SSL_set_quiet_shutdown(SSL *ssl, int mode);
- void
SSL_set_read_ahead(SSL *ssl, int yes);
- int SSL_set_rfd(SSL
*ssl, int fd);
- int
SSL_set_session(SSL *ssl, SSL_SESSION *session);
- void
SSL_set_shutdown(SSL *ssl, int mode);
- int
SSL_set_ssl_method(SSL *ssl, const SSL_METHOD *meth);
- void
SSL_set_time(SSL *ssl, long t);
- void
SSL_set_timeout(SSL *ssl, long t);
- void
SSL_set_verify(SSL *ssl, int mode, int (*callback);(void))
- void
SSL_set_verify_result(SSL *ssl, long arg);
- int SSL_set_wfd(SSL
*ssl, int fd);
- int
SSL_shutdown(SSL *ssl);
- OSSL_HANDSHAKE_STATE
SSL_get_state(const SSL *ssl);
- Returns the current handshake state.
- char
*SSL_state_string(const SSL *ssl);
- char
*SSL_state_string_long(const SSL *ssl);
- long
SSL_total_renegotiations(SSL *ssl);
- int
SSL_use_PrivateKey(SSL *ssl, EVP_PKEY *pkey);
- int
SSL_use_PrivateKey_ASN1(int type, SSL *ssl, unsigned char *d, long
len);
- int
SSL_use_PrivateKey_file(SSL *ssl, const char *file, int
type);
- int
SSL_use_RSAPrivateKey(SSL *ssl, RSA *rsa);
- int
SSL_use_RSAPrivateKey_ASN1(SSL *ssl, unsigned char *d, long
len);
- int
SSL_use_RSAPrivateKey_file(SSL *ssl, const char *file, int
type);
- int
SSL_use_certificate(SSL *ssl, X509 *x);
- int
SSL_use_certificate_ASN1(SSL *ssl, int len, unsigned char
*d);
- int
SSL_use_certificate_file(SSL *ssl, const char *file, int
type);
- int
SSL_use_cert_and_key(SSL *ssl, X509 *x, EVP_PKEY *pkey,
STACK_OF(X509) *chain, int override);
- int
SSL_version(const SSL *ssl);
- int
SSL_want(const SSL *ssl);
- int
SSL_want_nothing(const SSL *ssl);
- int
SSL_want_read(const SSL *ssl);
- int
SSL_want_write(const SSL *ssl);
- int
SSL_want_x509_lookup(const SSL *ssl);
- int SSL_write(SSL
*ssl, const void *buf, int num);
- void
SSL_set_psk_client_callback(SSL *ssl, unsigned int (*callback)(SSL
*ssl, const char *hint, char *identity, unsigned int max_identity_len,
unsigned char *psk, unsigned int max_psk_len));
- int
SSL_use_psk_identity_hint(SSL *ssl, const char *hint);
- void
SSL_set_psk_server_callback(SSL *ssl, unsigned int (*callback)(SSL
*ssl, const char *identity, unsigned char *psk, int max_psk_len));
- const char
*SSL_get_psk_identity_hint(SSL *ssl);
- const char
*SSL_get_psk_identity(SSL *ssl);
See the individual manual pages for details.
openssl(1), crypto(7),
CRYPTO_get_ex_new_index(3), SSL_accept(3),
SSL_clear(3), SSL_connect(3), SSL_CIPHER_get_name(3),
SSL_COMP_add_compression_method(3),
SSL_CTX_add_extra_chain_cert(3), SSL_CTX_add_session(3),
SSL_CTX_ctrl(3), SSL_CTX_flush_sessions(3),
SSL_CTX_get_verify_mode(3), SSL_CTX_load_verify_locations(3)
SSL_CTX_new(3), SSL_CTX_sess_number(3),
SSL_CTX_sess_set_cache_size(3), SSL_CTX_sess_set_get_cb(3),
SSL_CTX_sessions(3), SSL_CTX_set_cert_store(3),
SSL_CTX_set_cert_verify_callback(3),
SSL_CTX_set_cipher_list(3), SSL_CTX_set_client_CA_list(3),
SSL_CTX_set_client_cert_cb(3),
SSL_CTX_set_default_passwd_cb(3),
SSL_CTX_set_generate_session_id(3),
SSL_CTX_set_info_callback(3), SSL_CTX_set_max_cert_list(3),
SSL_CTX_set_mode(3), SSL_CTX_set_msg_callback(3),
SSL_CTX_set_options(3), SSL_CTX_set_quiet_shutdown(3),
SSL_CTX_set_read_ahead(3), SSL_CTX_set_security_level(3),
SSL_CTX_set_session_cache_mode(3),
SSL_CTX_set_session_id_context(3), SSL_CTX_set_ssl_version(3),
SSL_CTX_set_timeout(3), SSL_CTX_set_tmp_dh_callback(3),
SSL_CTX_set_verify(3), SSL_CTX_use_certificate(3),
SSL_alert_type_string(3), SSL_do_handshake(3),
SSL_enable_ct(3), SSL_get_SSL_CTX(3),
SSL_get_ciphers(3), SSL_get_client_CA_list(3),
SSL_get_default_timeout(3), SSL_get_error(3),
SSL_get_ex_data_X509_STORE_CTX_idx(3), SSL_get_fd(3),
SSL_get_peer_cert_chain(3), SSL_get_rbio(3),
SSL_get_session(3), SSL_get_verify_result(3),
SSL_get_version(3), SSL_load_client_CA_file(3),
SSL_new(3), SSL_pending(3), SSL_read_ex(3),
SSL_read(3), SSL_rstate_string(3),
SSL_session_reused(3), SSL_set_bio(3),
SSL_set_connect_state(3), SSL_set_fd(3),
SSL_set_session(3), SSL_set_shutdown(3),
SSL_shutdown(3), SSL_state_string(3), SSL_want(3),
SSL_write_ex(3), SSL_write(3), SSL_SESSION_free(3),
SSL_SESSION_get_time(3), d2i_SSL_SESSION(3),
SSL_CTX_set_psk_client_callback(3),
SSL_CTX_use_psk_identity_hint(3), SSL_get_psk_identity(3),
DTLSv1_listen(3)
SSLv2_client_method, SSLv2_server_method and
SSLv2_method were removed in OpenSSL 1.1.0.
The return type of SSL_copy_session_id was changed from
void to int in OpenSSL 1.1.0.
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