esp-idf/components/openssl/OpenSSL-APIs.rst

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OpenSSL-APIs
============
All original source code in this repository is Copyright (C) 2015-2016
Espressif Systems. This source code is licensed under the Apache
License 2.0 as described in the file LICENSE.
Chapter Introduction
====================
Chapter 1. SSL Context Method Create
Chapter 2. SSL Context Fucntion
Chapter 3. SSL Fucntion
Chapter 4. SSL X509 Certification and Private Key Function
Chapter 1. SSL Context Method Create
====================================
1.1 const SSL_METHOD* SSLv23_client_method(void);
Arguments : none
Return : SSLV2 and 3 version SSL context client method point
Description : create the target SSL context method
Example :
void example(void)
{
const SSL_METHOD *method = SSLv23_client_method();
...
}
1.2 const SSL_METHOD* TLSv1_client_method(void);
Arguments : none
Return : TLSV1.0 version SSL context client method point
Description : create the target SSL context method
Example :
void example(void)
{
const SSL_METHOD *method = TLSv1_client_method();
...
}
1.3 const SSL_METHOD* SSLv3_client_method(void);
Arguments : none
Return : SSLV3.0 version SSL context client method point
Description : create the target SSL context method
Example :
void example(void)
{
const SSL_METHOD *method = SSLv3_client_method();
...
}
1.4 const SSL_METHOD* TLSv1_1_client_method(void);
Arguments : none
Return : TLSV1.1 version SSL context client method point
Description : create the target SSL context method
Example :
void example(void)
{
const SSL_METHOD *method = TLSv1_1_client_method();
...
}
1.5 const SSL_METHOD* TLSv1_2_client_method(void);
Arguments : none
Return : TLSV1.2 version SSL context client method point
Description : create the target SSL context method
Example :
void example(void)
{
const SSL_METHOD *method = TLSv1_2_client_method();
...
}
1.6 const SSL_METHOD* SSLv23_server_method(void);
Arguments : none
Return : SSLV2 and 3 version SSL context server method point
Description : create the target SSL context method
Example :
void example(void)
{
const SSL_METHOD *method = SSLv23_server_method();
...
}
1.7 const SSL_METHOD* TLSv1_1_server_method(void);
Arguments : none
Return : TLSV1.1 version SSL context server method point
Description : create the target SSL context method
Example :
void example(void)
{
const SSL_METHOD *method = TLSv1_1_server_method();
...
}
1.8 const SSL_METHOD* TLSv1_2_server_method(void);
Arguments : none
Return : TLSV1.2 version SSL context server method point
Description : create the target SSL context method
Example :
void example(void)
{
const SSL_METHOD *method = TLSv1_2_server_method();
...
}
1.9 const SSL_METHOD* TLSv1_server_method(void);
Arguments : none
Return : TLSV1.0 version SSL context server method point
Description : create the target SSL context method
Example :
void example(void)
{
const SSL_METHOD *method = TLSv1_server_method();
...
}
1.10 const SSL_METHOD* SSLv3_server_method(void);
Arguments : none
Return : SSLV3.0 version SSL context server method point
Description : create the target SSL context method
Example :
void example(void)
{
const SSL_METHOD *method = SSLv3_server_method();
...
}
Chapter 2. SSL Context Fucntion
===============================
2.1 SSL_CTX* SSL_CTX_new(const SSL_METHOD *method);
Arguments : method - the SSL context method point
Return : context point
Description : create a SSL context
Example :
void example(void)
{
SSL_CTX *ctx = SSL_CTX_new(SSLv3_server_method());
...
}
2.2 void SSL_CTX_free(SSL_CTX *ctx);
Arguments : ctx - the SSL context point
Return : none
Description : free a SSL context
Example :
void example(void)
{
SSL_CTX *ctx;
... ...
SSL_CTX_free(ctx);
}
2.3 int SSL_CTX_set_ssl_version(SSL_CTX *ctx, const SSL_METHOD *meth);
Arguments : ctx - SSL context point
meth - SSL method point
Return : result
1 : OK
0 : failed
Description : set the SSL context version
Example :
void example(void)
{
SSL_CTX *ctx;
const SSL_METHOD *meth;
... ...
SSL_CTX_set_ssl_version(ctx, meth);
}
2.4 const SSL_METHOD *SSL_CTX_get_ssl_method(SSL_CTX *ctx);
Arguments : ctx - SSL context point
Return : SSL context method
Description : get the SSL context method
Example :
void example(void)
{
const SSL_METHOD *method;
SSL_CTX *ctx;
... ...
method = SSL_CTX_get_ssl_method(ctx);
}
Chapter 3. SSL Fucntion
=======================
3.1 SSL* SSL_new(SSL_CTX *ctx);
Arguments : ctx - SSL context point
Return : SSL method
Description : create a SSL
Example :
void example(void)
{
SSL *ssl;
SSL_CTX *ctx;
... ...
ssl = SSL_new(ctx);
}
3.2 void SSL_free(SSL *ssl);
Arguments : ssl - SSL point
Return : none
Description : free SSL
Example :
void example(void)
{
SSL *ssl;
... ...
SSL_free(ssl);
}
3.3 int SSL_do_handshake(SSL *ssl);
Arguments : ssl - SSL point
Return : result
1 : OK
0 : failed, connect is close by remote
-1 : a error catch
Description : perform the SSL handshake
Example :
void example(void)
{
SSL *ssl;
int ret;
... ...
ret = SSL_do_handshake(ssl);
}
3.4 int SSL_connect(SSL *ssl);
Arguments : ssl - SSL point
Return : result
1 : OK
0 : failed, connect is close by remote
-1 : a error catch
Description : connect to the remote SSL server
Example :
void example(void)
{
SSL *ssl;
int ret;
... ...
ret = SSL_connect(ssl);
}
3.5 int SSL_accept(SSL *ssl);
Arguments : ssl - SSL point
Return : result
1 : OK
0 : failed, connect is close by remote
-1 : a error catch
Description : accept the remote connection
Example :
void example(void)
{
SSL *ssl;
int ret;
... ...
ret = SSL_accept(ssl);
}
3.6 int SSL_shutdown(SSL *ssl);
Arguments : ssl - SSL point
Return : result
1 : OK
0 : failed, connect is close by remote
-1 : a error catch
Description : shutdown the connection
Example :
void example(void)
{
SSL *ssl;
int ret;
... ...
ret = SSL_shutdown(ssl);
}
3.7 int SSL_clear(SSL *ssl);
Arguments : ssl - SSL point
Return : result
1 : OK
0 : failed
Description : shutdown the connection
Example :
void example(void)
{
SSL *ssl;
int ret;
... ...
ret = SSL_clear(ssl);
}
3.8 int SSL_read(SSL *ssl, void *buffer, int len);
Arguments : ssl - point
buffer - data buffer point
len - data length
Return : result
> 0 : OK, and return received data bytes
= 0 : no data received or connection is closed
< 0 : an error catch
Description : read data from remote
Example :
void example(void)
{
SSL *ssl;
char *buf;
int len;
int ret;
... ...
ret = SSL_read(ssl, buf, len);
}
3.9 int SSL_write(SSL *ssl, const void *buffer, int len);
Arguments : ssl - SSL point
buffer - data buffer point
len - data length
Return : result
> 0 : OK, and return received data bytes
= 0 : no data sent or connection is closed
< 0 : an error catch
Description : send the data to remote
Example :
void example(void)
{
SSL *ssl;
char *buf;
int len;
int ret;
... ...
ret = SSL_write(ssl, buf, len);
}
3.10 SSL_CTX *SSL_get_SSL_CTX(const SSL *ssl);
Arguments : ssl - SSL point
Return : SSL context
Description : get SSL context of the SSL
Example :
void example(void)
{
SSL *ssl;
SSL_CTX *ctx;
... ...
ctx = SSL_get_SSL_CTX(ssl);
}
3.11 int SSL_get_shutdown(const SSL *ssl);
Arguments : ssl - SSL point
Return : shutdown mode
Description : get SSL shutdown mode
Example :
void example(void)
{
SSL *ssl;
int mode;
... ...
mode = SSL_get_SSL_CTX(ssl);
}
3.12 void SSL_set_shutdown(SSL *ssl, int mode);
Arguments : ssl - SSL point
Return : shutdown mode
Description : set SSL shutdown mode
Example :
void example(void)
{
SSL *ssl;
int mode = 0;
... ...
SSL_set_shutdown(ssl, mode);
}
3.13 const SSL_METHOD *SSL_get_ssl_method(SSL *ssl);
Arguments : ssl - SSL point
Return : SSL method
Description : set SSL shutdown mode
Example :
void example(void)
{
SSL *ssl;
const SSL_METHOD *method;
... ...
method = SSL_get_ssl_method(ssl);
}
3.14 int SSL_set_ssl_method(SSL *ssl, const SSL_METHOD *method);
Arguments : ssl - SSL point
meth - SSL method point
Return : result
1 : OK
0 : failed
Description : set the SSL method
Example :
void example(void)
{
int ret;
SSL *ssl;
const SSL_METHOD *method;
... ...
ret = SSL_set_ssl_method(ssl, method);
}
3.15 int SSL_pending(const SSL *ssl);
Arguments : ssl - SSL point
Return : data bytes
Description : get received data bytes
Example :
void example(void)
{
int ret;
SSL *ssl;
... ...
ret = SSL_pending(ssl);
}
3.16 int SSL_has_pending(const SSL *ssl);
Arguments : ssl - SSL point
Return : result
1 : Yes
0 : No
Description : check if data is received
Example :
void example(void)
{
int ret;
SSL *ssl;
... ...
ret = SSL_has_pending(ssl);
}
3.17 int SSL_get_fd(const SSL *ssl);
Arguments : ssl - SSL point
Return : result
>= 0 : socket id
< 0 : a error catch
Description : get the socket of the SSL
Example :
void example(void)
{
int ret;
SSL *ssl;
... ...
ret = SSL_get_fd(ssl);
}
3.18 int SSL_get_rfd(const SSL *ssl);
Arguments : ssl - SSL point
Return : result
>= 0 : socket id
< 0 : a error catch
Description : get the read only socket of the SSL
Example :
void example(void)
{
int ret;
SSL *ssl;
... ...
ret = SSL_get_rfd(ssl);
}
3.19 int SSL_get_wfd(const SSL *ssl);
Arguments : ssl - SSL point
Return : result
>= 0 : socket id
< 0 : a error catch
Description : get the write only socket of the SSL
Example :
void example(void)
{
int ret;
SSL *ssl;
... ...
ret = SSL_get_wfd(ssl);
}
3.20 int SSL_set_fd(SSL *ssl, int fd);
Arguments : ssl - SSL point
fd - socket id
Return : result
1 : OK
0 : failed
Description : set socket to SSL
Example :
void example(void)
{
int ret;
SSL *ssl;
int socket;
... ...
ret = SSL_set_fd(ssl, socket);
}
3.21 int SSL_set_rfd(SSL *ssl, int fd);
Arguments : ssl - SSL point
fd - socket id
Return : result
1 : OK
0 : failed
Description : set read only socket to SSL
Example :
void example(void)
{
int ret;
SSL *ssl;
int socket;
... ...
ret = SSL_set_rfd(ssl, socket);
}
3.22 int SSL_set_wfd(SSL *ssl, int fd);
Arguments : ssl - SSL point
fd - socket id
Return : result
1 : OK
0 : failed
Description : set write only socket to SSL
Example :
void example(void)
{
int ret;
SSL *ssl;
int socket;
... ...
ret = SSL_set_wfd(ssl, socket);
}
3.23 int SSL_version(const SSL *ssl);
Arguments : ssl - SSL point
Return : SSL version
Description : get SSL version
Example :
void example(void)
{
int version;
SSL *ssl;
... ...
version = SSL_version(ssl);
}
3.24 const char *SSL_get_version(const SSL *ssl);
Arguments : ssl - SSL point
Return : SSL version string
Description : get the SSL current version string
Example :
void example(void)
{
char *version;
SSL *ssl;
... ...
version = SSL_get_version(ssl);
}
3.25 OSSL_HANDSHAKE_STATE SSL_get_state(const SSL *ssl);
Arguments : ssl - SSL point
Return : SSL state
Description : get the SSL state
Example :
void example(void)
{
OSSL_HANDSHAKE_STATE state;
SSL *ssl;
... ...
state = SSL_get_state(ssl);
}
3.26 const char *SSL_alert_desc_string(int value);
Arguments : value - SSL description
Return : alert value string
Description : get alert description string
Example :
void example(void)
{
int val;
char *str;
... ...
str = SSL_alert_desc_string(val);
}
3.27 const char *SSL_alert_desc_string_long(int value);
Arguments : value - SSL description
Return : alert value long string
Description : get alert description long string
Example :
void example(void)
{
int val;
char *str;
... ...
str = SSL_alert_desc_string_long(val);
}
3.28 const char *SSL_alert_type_string(int value);
Arguments : value - SSL type description
Return : alert type string
Description : get alert type string
Example :
void example(void)
{
int val;
char *str;
... ...
str = SSL_alert_type_string(val);
}
3.29 const char *SSL_alert_type_string_long(int value);
Arguments : value - SSL type description
Return : alert type long string
Description : get alert type long string
Example :
void example(void)
{
int val;
char *str;
... ...
str = SSL_alert_type_string_long(val);
}
3.30 const char *SSL_rstate_string(SSL *ssl);
Arguments : ssl - SSL point
Return : state string
Description : get the state string where SSL is reading
Example :
void example(void)
{
SSL *ssl;
char *str;
... ...
str = SSL_rstate_string(ssl);
}
3.31 const char *SSL_rstate_string_long(SSL *ssl);
Arguments : ssl - SSL point
Return : state long string
Description : get the state long string where SSL is reading
Example :
void example(void)
{
SSL *ssl;
char *str;
... ...
str = SSL_rstate_string_long(ssl);
}
3.32 char *SSL_state_string(const SSL *ssl);
Arguments : ssl - SSL point
Return : state string
Description : get the state string
Example :
void example(void)
{
SSL *ssl;
char *str;
... ...
str = SSL_state_string(ssl);
}
3.33 char *SSL_state_string_long(const SSL *ssl);
Arguments : ssl - SSL point
Return : state long string
Description : get the state long string
Example :
void example(void)
{
SSL *ssl;
char *str;
... ...
str = SSL_state_string(ssl);
}
3.34 int SSL_get_error(const SSL *ssl, int ret_code);
Arguments : ssl - SSL point
ret_code - SSL return code
Return : SSL error number
Description : get SSL error code
Example :
void example(void)
{
SSL *ssl;
int ret;
int err;
... ...
err = SSL_get_error(ssl, ret);
}
3.35 void SSL_CTX_set_default_read_buffer_len(SSL_CTX *ctx, size_t len);
Arguments : ctx - SSL context point
len - read buffer length
Return : none
Description : set the SSL context read buffer length
Example :
void example(void)
{
SSL_CTX *ctx;
size_t len;
... ...
SSL_CTX_set_default_read_buffer_len(ctx, len);
}
3.36 void SSL_set_default_read_buffer_len(SSL *ssl, size_t len);
Arguments : ssl - SSL point
len - read buffer length
Return : none
Description : set the SSL read buffer length
Example :
void example(void)
{
SSL *ssl;
size_t len;
... ...
SSL_set_default_read_buffer_len(ctx, len);
}
3.37 int SSL_want(const SSL *ssl);
Arguments : ssl - SSL point
Return : specifical statement
Description : get the SSL specifical statement
Example :
void example(void)
{
SSL *ssl;
int state;
... ...
state = SSL_want(ssl);
}
3.38 int SSL_want_nothing(const SSL *ssl);
Arguments : ssl - SSL point
Return : result
0 : false
1 : true
Description : check if SSL want nothing
Example :
void example(void)
{
SSL *ssl;
int ret;
... ...
ret = SSL_want(ssl);
}
3.39 int SSL_want_read(const SSL *ssl);
Arguments : ssl - SSL point
Return : result
0 : false
1 : true
Description : check if SSL want to read
Example :
void example(void)
{
SSL *ssl;
int ret;
... ...
ret = SSL_want_read(ssl);
}
3.40 int SSL_want_write(const SSL *ssl);
Arguments : ssl - SSL point
Return : result
0 : false
1 : true
Description : check if SSL want to write
Example :
void example(void)
{
SSL *ssl;
int ret;
... ...
ret = SSL_want_write(ssl);
}
Chapter 4. SSL X509 Certification and Private Key Function
==========================================================
4.1 X509* d2i_X509(X509 **cert, const unsigned char *buffer, long len);
Arguments : cert - a point pointed to X509 certification
buffer - a point pointed to the certification context memory point
length - certification bytes
Return : X509 certification object point
Description : load a character certification context into system context. If '*cert' is pointed to the
certification, then load certification into it. Or create a new X509 certification object
Example :
void example(void)
{
X509 *new;
X509 *cert;
unsigned char *buffer;
long len;
... ...
new = d2i_X509(&cert, buffer, len);
}
4.2 int SSL_add_client_CA(SSL *ssl, X509 *x);
Arguments : ssl - SSL point
x - CA certification point
Return : result
1 : OK
0 : failed
Description : add CA client certification into the SSL
Example :
void example(void)
{
int ret;
SSL *ssl;
X509 *new;
... ...
ret = SSL_add_client_CA(ssl, new);
}
4.3 int SSL_CTX_add_client_CA(SSL_CTX *ctx, X509 *x);
Arguments : ctx - SSL context point
x - CA certification point
Return : result
1 : OK
0 : failed
Description : add CA client certification into the SSL context
Example :
void example(void)
{
int ret;
SSL_CTX *ctx;
X509 *new;
... ...
ret = SSL_add_clSSL_CTX_add_client_CAient_CA(ctx, new);
}
4.4 X509 *SSL_get_certificate(const SSL *ssl);
Arguments : ssl - SSL point
Return : SSL certification point
Description : get the SSL certification point
Example :
void example(void)
{
SSL *ssl;
X509 *cert;
... ...
cert = SSL_get_certificate(ssl);
}
4.5 long SSL_get_verify_result(const SSL *ssl);
Arguments : ssl - SSL point
Return : the result of verifying
Description : get the verifying result of the SSL certification
Example :
void example(void)
{
SSL *ssl;
long ret;
... ...
ret = SSL_get_verify_result(ssl);
}
4.6 int SSL_CTX_use_certificate(SSL_CTX *ctx, X509 *x);
Arguments : ctx - the SSL context point
pkey - certification object point
Return : result
1 : OK
0 : failed
Description : load the certification into the SSL_CTX or SSL object
Example :
void example(void)
{
int ret;
SSL_CTX *ctx
X509 *new;
... ...
ret = SSL_CTX_use_certificate(ctx, new);
}
4.7 int SSL_CTX_use_certificate_ASN1(SSL_CTX *ctx, int len, const unsigned char *d);
Arguments : ctx - SSL context point
len - certification length
d - data point
Return : result
1 : OK
0 : failed
Description : load the ASN1 certification into SSL context
Example :
void example(void)
{
int ret;
SSL_CTX *ctx;
const unsigned char *buf;
int len;
... ...
ret = SSL_CTX_use_certificate_ASN1(ctx, len, buf);
}
4.8 int SSL_CTX_use_PrivateKey(SSL_CTX *ctx, EVP_PKEY *pkey);
Arguments : ctx - SSL context point
pkey - private key object point
Return : result
1 : OK
0 : failed
Description : load the private key into the context object
Example :
void example(void)
{
int ret;
SSL_CTX *ctx;
EVP_PKEY *pkey;
... ...
ret = SSL_CTX_use_PrivateKey(ctx, pkey);
}
4.9 int SSL_CTX_use_PrivateKey_ASN1(int pk, SSL_CTX *ctx, const unsigned char *d, long len);
Arguments : ctx - SSL context point
d - data point
len - private key length
Return : result
1 : OK
0 : failed
Description : load the ASN1 private key into SSL context
Example :
void example(void)
{
int ret;
int pk;
SSL_CTX *ctx;
const unsigned char *buf;
long len;
... ...
ret = SSL_CTX_use_PrivateKey_ASN1(pk, ctx, buf, len);
}
4.10 int SSL_CTX_use_RSAPrivateKey_ASN1(SSL_CTX *ctx, const unsigned char *d, long len);
Arguments : ctx - SSL context point
d - data point
len - private key length
Return : result
1 : OK
0 : failed
Description : load the RSA ASN1 private key into SSL context
Example :
void example(void)
{
int ret;
SSL_CTX *ctx;
const unsigned char *buf;
long len;
... ...
ret = SSL_CTX_use_RSAPrivateKey_ASN1(ctx, buf, len);
}
4.11 int SSL_use_certificate_ASN1(SSL *ssl, int len, const unsigned char *d);
Arguments : ssl - SSL point
len - data bytes
d - data point
Return : result
1 : OK
0 : failed
Description : load certification into the SSL
Example :
void example(void)
{
int ret;
SSL *ssl;
const unsigned char *buf;
long len;
... ...
ret = SSL_use_certificate_ASN1(ssl, len, buf);
}
4.12 X509 *SSL_get_peer_certificate(const SSL *ssl);
Arguments : ssl - SSL point
Return : peer certification
Description : get peer certification
Example :
void example(void)
{
SSL *ssl;
X509 *peer;
... ...
peer = SSL_get_peer_certificate(ssl);
}