/home/dko/projects/mobilec/trunk/src/security/xyssl-0.9/include/xyssl/ssl.h File Reference

#include <time.h>
#include "xyssl/net.h"
#include "xyssl/dhm.h"
#include "xyssl/rsa.h"
#include "xyssl/md5.h"
#include "xyssl/sha1.h"
#include "xyssl/x509.h"

Go to the source code of this file.

Data Structures

struct _ssl_session

struct _ssl_context

Defines

#define XYSSL_ERR_SSL_FEATURE_UNAVAILABLE -0x1000

#define XYSSL_ERR_SSL_BAD_INPUT_DATA -0x1800

#define XYSSL_ERR_SSL_INVALID_MAC -0x2000

#define XYSSL_ERR_SSL_INVALID_RECORD -0x2800

#define XYSSL_ERR_SSL_INVALID_MODULUS_SIZE -0x3000

#define XYSSL_ERR_SSL_UNKNOWN_CIPHER -0x3800

#define XYSSL_ERR_SSL_NO_CIPHER_CHOSEN -0x4000

#define XYSSL_ERR_SSL_NO_SESSION_FOUND -0x4800

#define XYSSL_ERR_SSL_NO_CLIENT_CERTIFICATE -0x5000

#define XYSSL_ERR_SSL_CERTIFICATE_TOO_LARGE -0x5800

#define XYSSL_ERR_SSL_CERTIFICATE_REQUIRED -0x6000

#define XYSSL_ERR_SSL_PRIVATE_KEY_REQUIRED -0x6800

#define XYSSL_ERR_SSL_CA_CHAIN_REQUIRED -0x7000

#define XYSSL_ERR_SSL_UNEXPECTED_MESSAGE -0x7800

#define XYSSL_ERR_SSL_FATAL_ALERT_MESSAGE -0x8000

#define XYSSL_ERR_SSL_PEER_VERIFY_FAILED -0x8800

#define XYSSL_ERR_SSL_PEER_CLOSE_NOTIFY -0x9000

#define XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO -0x9800

#define XYSSL_ERR_SSL_BAD_HS_SERVER_HELLO -0xA000

#define XYSSL_ERR_SSL_BAD_HS_CERTIFICATE -0xA800

#define XYSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST -0xB000

#define XYSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE -0xB800

#define XYSSL_ERR_SSL_BAD_HS_SERVER_HELLO_DONE -0xC000

#define XYSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE -0xC800

#define XYSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY -0xD000

#define XYSSL_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC -0xD800

#define XYSSL_ERR_SSL_BAD_HS_FINISHED -0xE000

#define SSL_MAJOR_VERSION_3 3

#define SSL_MINOR_VERSION_0 0

#define SSL_MINOR_VERSION_1 1

#define SSL_MINOR_VERSION_2 2

#define SSL_IS_CLIENT 0

#define SSL_IS_SERVER 1

#define SSL_COMPRESS_NULL 0

#define SSL_VERIFY_NONE 0

#define SSL_VERIFY_OPTIONAL 1

#define SSL_VERIFY_REQUIRED 2

#define SSL_MAX_CONTENT_LEN 16384

#define SSL_BUFFER_LEN (SSL_MAX_CONTENT_LEN + 512)

#define SSL_RSA_RC4_128_MD5 4

#define SSL_RSA_RC4_128_SHA 5

#define SSL_RSA_DES_168_SHA 10

#define SSL_EDH_RSA_DES_168_SHA 22

#define SSL_RSA_AES_128_SHA 47

#define SSL_RSA_AES_256_SHA 53

#define SSL_EDH_RSA_AES_256_SHA 57

#define SSL_MSG_CHANGE_CIPHER_SPEC 20

#define SSL_MSG_ALERT 21

#define SSL_MSG_HANDSHAKE 22

#define SSL_MSG_APPLICATION_DATA 23

#define SSL_ALERT_CLOSE_NOTIFY 0

#define SSL_ALERT_WARNING 1

#define SSL_ALERT_FATAL 2

#define SSL_ALERT_NO_CERTIFICATE 41

#define SSL_HS_HELLO_REQUEST 0

#define SSL_HS_CLIENT_HELLO 1

#define SSL_HS_SERVER_HELLO 2

#define SSL_HS_CERTIFICATE 11

#define SSL_HS_SERVER_KEY_EXCHANGE 12

#define SSL_HS_CERTIFICATE_REQUEST 13

#define SSL_HS_SERVER_HELLO_DONE 14

#define SSL_HS_CERTIFICATE_VERIFY 15

#define SSL_HS_CLIENT_KEY_EXCHANGE 16

#define SSL_HS_FINISHED 20

#define TLS_EXT_SERVERNAME 0

#define TLS_EXT_SERVERNAME_HOSTNAME 0

Typedefs

typedef struct _ssl_session ssl_session

typedef struct _ssl_context ssl_context

Enumerations

enum ssl_states {
SSL_HELLO_REQUEST, SSL_CLIENT_HELLO, SSL_SERVER_HELLO, SSL_SERVER_CERTIFICATE,
SSL_SERVER_KEY_EXCHANGE, SSL_CERTIFICATE_REQUEST, SSL_SERVER_HELLO_DONE, SSL_CLIENT_CERTIFICATE,
SSL_CLIENT_KEY_EXCHANGE, SSL_CERTIFICATE_VERIFY, SSL_CLIENT_CHANGE_CIPHER_SPEC, SSL_CLIENT_FINISHED,
SSL_SERVER_CHANGE_CIPHER_SPEC, SSL_SERVER_FINISHED, SSL_FLUSH_BUFFERS, SSL_HANDSHAKE_OVER
}

Functions

int ssl_init (ssl_context *ssl)

Initialize an SSL context.

void ssl_set_endpoint (ssl_context *ssl, int endpoint)

Set the current endpoint type.

void ssl_set_authmode (ssl_context *ssl, int authmode)

Set the certificate verification mode.

void ssl_set_rng (ssl_context *ssl, int(*f_rng)(void *), void *p_rng)

Set the random number generator callback.

void ssl_set_dbg (ssl_context *ssl, void(*f_dbg)(void *, int, char *), void *p_dbg)

Set the debug callback.

void ssl_set_bio (ssl_context *ssl, int(*f_recv)(void *, unsigned char *, int), void *p_recv, int(*f_send)(void *, unsigned char *, int), void *p_send)

Set the underlying BIO read and write callbacks.

void ssl_set_scb (ssl_context *ssl, int(*s_get)(ssl_context *), int(*s_set)(ssl_context *))

Set the session callbacks (server-side only).

void ssl_set_session (ssl_context *ssl, int resume, int timeout, ssl_session *session)

Set the session resuming flag, timeout and data.

void ssl_set_ciphers (ssl_context *ssl, int *ciphers)

Set the list of allowed ciphersuites.

void ssl_set_ca_chain (ssl_context *ssl, x509_cert *ca_chain, char *peer_cn)

Set the data required to verify peer certificate.

void ssl_set_own_cert (ssl_context *ssl, x509_cert *own_cert, rsa_context *rsa_key)

Set own certificate and private key.

int ssl_set_dh_param (ssl_context *ssl, char *dhm_P, char *dhm_G)

Set the Diffie-Hellman public P and G values, read as hexadecimal strings (server-side only).

int ssl_set_hostname (ssl_context *ssl, char *hostname)

Set hostname for ServerName TLS Extension.

int ssl_get_bytes_avail (ssl_context *ssl)

Return the number of data bytes available to read.

int ssl_get_verify_result (ssl_context *ssl)

Return the result of the certificate verification.

char * ssl_get_cipher (ssl_context *ssl)

Return the name of the current cipher.

int ssl_handshake (ssl_context *ssl)

Perform the SSL handshake.

int ssl_read (ssl_context *ssl, unsigned char *buf, int len)

Read at most 'len' application data bytes.

int ssl_write (ssl_context *ssl, unsigned char *buf, int len)

Write exactly 'len' application data bytes.

int ssl_close_notify (ssl_context *ssl)

Notify the peer that the connection is being closed.

void ssl_free (ssl_context *ssl)

Free an SSL context.

int ssl_handshake_client (ssl_context *ssl)

int ssl_handshake_server (ssl_context *ssl)

int ssl_derive_keys (ssl_context *ssl)

void ssl_calc_verify (ssl_context *ssl, unsigned char hash[36])

int ssl_read_record (ssl_context *ssl)

int ssl_fetch_input (ssl_context *ssl, int nb_want)

int ssl_write_record (ssl_context *ssl)

int ssl_flush_output (ssl_context *ssl)

int ssl_parse_certificate (ssl_context *ssl)

int ssl_write_certificate (ssl_context *ssl)

int ssl_parse_change_cipher_spec (ssl_context *ssl)

int ssl_write_change_cipher_spec (ssl_context *ssl)

int ssl_parse_finished (ssl_context *ssl)

int ssl_write_finished (ssl_context *ssl)

Variables

int ssl_default_ciphers []

Detailed Description

Definition in file ssl.h.

Define Documentation

#define SSL_ALERT_CLOSE_NOTIFY 0

Definition at line 87 of file ssl.h.

#define SSL_ALERT_FATAL 2

Definition at line 89 of file ssl.h.

#define SSL_ALERT_NO_CERTIFICATE 41

Definition at line 90 of file ssl.h.

#define SSL_ALERT_WARNING 1

Definition at line 88 of file ssl.h.

#define SSL_BUFFER_LEN (SSL_MAX_CONTENT_LEN + 512)

Definition at line 66 of file ssl.h.

#define SSL_COMPRESS_NULL 0

Definition at line 54 of file ssl.h.

#define SSL_EDH_RSA_AES_256_SHA 57

Definition at line 77 of file ssl.h.

Referenced by main().

#define SSL_EDH_RSA_DES_168_SHA 22

Definition at line 74 of file ssl.h.

Referenced by main().

#define SSL_HS_CERTIFICATE 11

Definition at line 95 of file ssl.h.

#define SSL_HS_CERTIFICATE_REQUEST 13

Definition at line 97 of file ssl.h.

#define SSL_HS_CERTIFICATE_VERIFY 15

Definition at line 99 of file ssl.h.

#define SSL_HS_CLIENT_HELLO 1

Definition at line 93 of file ssl.h.

#define SSL_HS_CLIENT_KEY_EXCHANGE 16

Definition at line 100 of file ssl.h.

#define SSL_HS_FINISHED 20

Definition at line 101 of file ssl.h.

#define SSL_HS_HELLO_REQUEST 0

Definition at line 92 of file ssl.h.

#define SSL_HS_SERVER_HELLO 2

Definition at line 94 of file ssl.h.

#define SSL_HS_SERVER_HELLO_DONE 14

Definition at line 98 of file ssl.h.

#define SSL_HS_SERVER_KEY_EXCHANGE 12

Definition at line 96 of file ssl.h.

#define SSL_IS_CLIENT 0

Definition at line 52 of file ssl.h.

Referenced by main(), and ssl_test().

#define SSL_IS_SERVER 1

Definition at line 53 of file ssl.h.

Referenced by main(), and ssl_test().

#define SSL_MAJOR_VERSION_3 3

Definition at line 47 of file ssl.h.

#define SSL_MAX_CONTENT_LEN 16384

Definition at line 60 of file ssl.h.

#define SSL_MINOR_VERSION_0 0

SSL v3.0

Definition at line 48 of file ssl.h.

#define SSL_MINOR_VERSION_1 1

TLS v1.0

Definition at line 49 of file ssl.h.

#define SSL_MINOR_VERSION_2 2

TLS v1.1

Definition at line 50 of file ssl.h.

#define SSL_MSG_ALERT 21

Definition at line 83 of file ssl.h.

#define SSL_MSG_APPLICATION_DATA 23

Definition at line 85 of file ssl.h.

#define SSL_MSG_CHANGE_CIPHER_SPEC 20

Definition at line 82 of file ssl.h.

#define SSL_MSG_HANDSHAKE 22

Definition at line 84 of file ssl.h.

#define SSL_RSA_AES_128_SHA 47

Definition at line 75 of file ssl.h.

Referenced by main().

#define SSL_RSA_AES_256_SHA 53

Definition at line 76 of file ssl.h.

Referenced by main().

#define SSL_RSA_DES_168_SHA 10

Definition at line 73 of file ssl.h.

Referenced by main().

#define SSL_RSA_RC4_128_MD5 4

Definition at line 71 of file ssl.h.

Referenced by main().

#define SSL_RSA_RC4_128_SHA 5

Definition at line 72 of file ssl.h.

Referenced by main().

#define SSL_VERIFY_NONE 0

Definition at line 56 of file ssl.h.

Referenced by main(), and ssl_test().

#define SSL_VERIFY_OPTIONAL 1

Definition at line 57 of file ssl.h.

Referenced by main().

#define SSL_VERIFY_REQUIRED 2

Definition at line 58 of file ssl.h.

#define TLS_EXT_SERVERNAME 0

Definition at line 106 of file ssl.h.

#define TLS_EXT_SERVERNAME_HOSTNAME 0

Definition at line 107 of file ssl.h.

#define XYSSL_ERR_SSL_BAD_HS_CERTIFICATE -0xA800

Definition at line 35 of file ssl.h.

#define XYSSL_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST -0xB000

Definition at line 36 of file ssl.h.

#define XYSSL_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY -0xD000

Definition at line 40 of file ssl.h.

#define XYSSL_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC -0xD800

Definition at line 41 of file ssl.h.

#define XYSSL_ERR_SSL_BAD_HS_CLIENT_HELLO -0x9800

Definition at line 33 of file ssl.h.

#define XYSSL_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE -0xC800

Definition at line 39 of file ssl.h.

#define XYSSL_ERR_SSL_BAD_HS_FINISHED -0xE000

Definition at line 42 of file ssl.h.

#define XYSSL_ERR_SSL_BAD_HS_SERVER_HELLO -0xA000

Definition at line 34 of file ssl.h.

#define XYSSL_ERR_SSL_BAD_HS_SERVER_HELLO_DONE -0xC000

Definition at line 38 of file ssl.h.

#define XYSSL_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE -0xB800

Definition at line 37 of file ssl.h.

#define XYSSL_ERR_SSL_BAD_INPUT_DATA -0x1800

Definition at line 17 of file ssl.h.

#define XYSSL_ERR_SSL_CA_CHAIN_REQUIRED -0x7000

Definition at line 28 of file ssl.h.

#define XYSSL_ERR_SSL_CERTIFICATE_REQUIRED -0x6000

Definition at line 26 of file ssl.h.

#define XYSSL_ERR_SSL_CERTIFICATE_TOO_LARGE -0x5800

Definition at line 25 of file ssl.h.

#define XYSSL_ERR_SSL_FATAL_ALERT_MESSAGE -0x8000

Definition at line 30 of file ssl.h.

#define XYSSL_ERR_SSL_FEATURE_UNAVAILABLE -0x1000

Definition at line 16 of file ssl.h.

#define XYSSL_ERR_SSL_INVALID_MAC -0x2000

Definition at line 18 of file ssl.h.

#define XYSSL_ERR_SSL_INVALID_MODULUS_SIZE -0x3000

Definition at line 20 of file ssl.h.

#define XYSSL_ERR_SSL_INVALID_RECORD -0x2800

Definition at line 19 of file ssl.h.

#define XYSSL_ERR_SSL_NO_CIPHER_CHOSEN -0x4000

Definition at line 22 of file ssl.h.

#define XYSSL_ERR_SSL_NO_CLIENT_CERTIFICATE -0x5000

Definition at line 24 of file ssl.h.

#define XYSSL_ERR_SSL_NO_SESSION_FOUND -0x4800

Definition at line 23 of file ssl.h.

#define XYSSL_ERR_SSL_PEER_CLOSE_NOTIFY -0x9000

Definition at line 32 of file ssl.h.

Referenced by main(), and ssl_test().

#define XYSSL_ERR_SSL_PEER_VERIFY_FAILED -0x8800

Definition at line 31 of file ssl.h.

#define XYSSL_ERR_SSL_PRIVATE_KEY_REQUIRED -0x6800

Definition at line 27 of file ssl.h.

#define XYSSL_ERR_SSL_UNEXPECTED_MESSAGE -0x7800

Definition at line 29 of file ssl.h.

#define XYSSL_ERR_SSL_UNKNOWN_CIPHER -0x3800

Definition at line 21 of file ssl.h.

Typedef Documentation

typedef struct _ssl_context ssl_context

Definition at line 134 of file ssl.h.

typedef struct _ssl_session ssl_session

Definition at line 133 of file ssl.h.

Enumeration Type Documentation

enum ssl_states

Enumerator:: SSL_HELLO_REQUEST

SSL_CLIENT_HELLO

SSL_SERVER_HELLO

SSL_SERVER_CERTIFICATE

SSL_SERVER_KEY_EXCHANGE

SSL_CERTIFICATE_REQUEST

SSL_SERVER_HELLO_DONE

SSL_CLIENT_CERTIFICATE

SSL_CLIENT_KEY_EXCHANGE

SSL_CERTIFICATE_VERIFY

SSL_CLIENT_CHANGE_CIPHER_SPEC

SSL_CLIENT_FINISHED

SSL_SERVER_CHANGE_CIPHER_SPEC

SSL_SERVER_FINISHED

SSL_FLUSH_BUFFERS

SSL_HANDSHAKE_OVER

Definition at line 112 of file ssl.h.

Function Documentation

void ssl_calc_verify ( ssl_context * ssl,

unsigned char hash[36]

)

int ssl_close_notify ( ssl_context * ssl )

Notify the peer that the connection is being closed.

Referenced by main(), and ssl_test().

int ssl_derive_keys ( ssl_context * ssl )

int ssl_fetch_input ( ssl_context * ssl,

int nb_want

)

int ssl_flush_output ( ssl_context * ssl )

void ssl_free ( ssl_context * ssl )

Free an SSL context.

Referenced by main(), and ssl_test().

int ssl_get_bytes_avail ( ssl_context * ssl )

Return the number of data bytes available to read.

Parameters:: ssl SSL context

Returns:: how many bytes are available in the read buffer

char* ssl_get_cipher ( ssl_context * ssl )

Return the name of the current cipher.

Parameters:: ssl SSL context

Returns:: a string containing the cipher name

Referenced by main().

int ssl_get_verify_result ( ssl_context * ssl )

Return the result of the certificate verification.

Parameters:: ssl SSL context

Returns:: 0 if successful, or a combination of: BADCERT_EXPIRED BADCERT_REVOKED BADCERT_CN_MISMATCH BADCERT_NOT_TRUSTED

Referenced by main().

int ssl_handshake ( ssl_context * ssl )

Perform the SSL handshake.

Parameters:: ssl SSL context

Returns:: 0 if successful, XYSSL_ERR_NET_TRY_AGAIN, or a specific SSL error code.

Referenced by main().

int ssl_handshake_client ( ssl_context * ssl )

int ssl_handshake_server ( ssl_context * ssl )

int ssl_init ( ssl_context * ssl )

Initialize an SSL context.

Parameters:: ssl SSL context

Returns:: 0 if successful, or 1 if memory allocation failed

Referenced by main(), and ssl_test().

int ssl_parse_certificate ( ssl_context * ssl )

int ssl_parse_change_cipher_spec ( ssl_context * ssl )

int ssl_parse_finished ( ssl_context * ssl )

int ssl_read ( ssl_context * ssl,

unsigned char * buf,

int len

)

Read at most 'len' application data bytes.

Parameters:: ssl SSL context

buf buffer that will hold the data

len how many bytes must be read

Returns:: This function returns the number of bytes read, or a negative error code.

Referenced by main(), and ssl_test().

int ssl_read_record ( ssl_context * ssl )

void ssl_set_authmode ( ssl_context * ssl,

int authmode

)

Set the certificate verification mode.

Parameters:: ssl SSL context

mode can be:

SSL_VERIFY_NONE: peer certificate is not checked (default), this is insecure and SHOULD be avoided.

SSL_VERIFY_OPTIONAL: peer certificate is checked, however the handshake continues even if verification failed; ssl_get_verify_result() can be called after the handshake is complete.

SSL_VERIFY_REQUIRED: peer *must* present a valid certificate, handshake is aborted if verification failed.

Referenced by main(), and ssl_test().

void ssl_set_bio ( ssl_context * ssl,

int(*)(void *, unsigned char *, int) f_recv,

void * p_recv,

int(*)(void *, unsigned char *, int) f_send,

void * p_send

)

Set the underlying BIO read and write callbacks.

Parameters:: ssl SSL context

f_recv read callback

p_recv read parameter

f_send write callback

p_send write parameter

Referenced by main(), and ssl_test().

void ssl_set_ca_chain ( ssl_context * ssl,

x509_cert * ca_chain,

char * peer_cn

)

Set the data required to verify peer certificate.

Parameters:: ssl SSL context

ca_chain trusted CA chain

peer_cn expected peer CommonName (or NULL)

Note:: TODO: add two more parameters: depth and crl

Referenced by main(), and ssl_test().

void ssl_set_ciphers ( ssl_context * ssl,

int * ciphers

)

Set the list of allowed ciphersuites.

Parameters:: ssl SSL context

ciphers 0-terminated list of allowed ciphers

Referenced by main(), and ssl_test().

void ssl_set_dbg ( ssl_context * ssl,

void(*)(void *, int, char *) f_dbg,

void * p_dbg

)

Set the debug callback.

Parameters:: ssl SSL context

f_dbg debug function

p_dbg debug parameter

Referenced by main(), and ssl_test().

int ssl_set_dh_param ( ssl_context * ssl,

char * dhm_P,

char * dhm_G

)

Set the Diffie-Hellman public P and G values, read as hexadecimal strings (server-side only).

Parameters:: ssl SSL context

dhm_P Diffie-Hellman-Merkle modulus

dhm_G Diffie-Hellman-Merkle generator

Returns:: 0 if successful

Referenced by main(), and ssl_test().

void ssl_set_endpoint ( ssl_context * ssl,

int endpoint

)

Set the current endpoint type.

Parameters:: ssl SSL context

endpoint must be SSL_IS_CLIENT or SSL_IS_SERVER

Referenced by main(), and ssl_test().

int ssl_set_hostname ( ssl_context * ssl,

char * hostname

)

Set hostname for ServerName TLS Extension.

Parameters:: ssl SSL context

hostname the server hostname

Returns:: 0 if successful

Referenced by main().

void ssl_set_own_cert ( ssl_context * ssl,

x509_cert * own_cert,

rsa_context * rsa_key

)

Set own certificate and private key.

Parameters:: ssl SSL context

own_cert own public certificate

rsa_key own private RSA key

Referenced by main(), and ssl_test().

void ssl_set_rng ( ssl_context * ssl,

int(*)(void *) f_rng,

void * p_rng

)

Set the random number generator callback.

Parameters:: ssl SSL context

f_rng RNG function

p_rng RNG parameter

Referenced by main(), and ssl_test().

void ssl_set_scb ( ssl_context * ssl,

int(*)(ssl_context *) s_get,

int(*)(ssl_context *) s_set

)

Set the session callbacks (server-side only).

Parameters:: ssl SSL context

s_get session get callback

s_set session set callback

Referenced by main().

void ssl_set_session ( ssl_context * ssl,

int resume,

int timeout,

ssl_session * session

)

Set the session resuming flag, timeout and data.

Parameters:: ssl SSL context

resume if 0 (default), the session will not be resumed

timeout session timeout in seconds, or 0 (no timeout)

session session context

Referenced by main(), and ssl_test().

int ssl_write ( ssl_context * ssl,

unsigned char * buf,

int len

)

Write exactly 'len' application data bytes.

Parameters:: ssl SSL context

buf buffer holding the data

len how many bytes must be written

Returns:: This function returns the number of bytes written, or a negative error code.

Note:: When this function returns XYSSL_ERR_NET_TRY_AGAIN, it must be called later with the *same* arguments, until it returns a positive value.

Referenced by main(), and ssl_test().

int ssl_write_certificate ( ssl_context * ssl )

int ssl_write_change_cipher_spec ( ssl_context * ssl )

int ssl_write_finished ( ssl_context * ssl )

int ssl_write_record ( ssl_context * ssl )

Variable Documentation

int ssl_default_ciphers[]

Referenced by main(), and ssl_test().

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