SSL (Apache Tomcat 10.1.55 API Documentation)
Description: declaration: package: org.apache.tomcat.jni, class: SSL

# Class SSL

java.lang.Object
org.apache.tomcat.jni.SSL

public final class SSL extends Object

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final int`
  `SSL_AIDX_DSA`
  `static final int`
  `SSL_AIDX_ECC`
  `static final int`
  `SSL_AIDX_MAX`
  `static final int`
  `SSL_AIDX_RSA`
  `static final int`
  `SSL_ALGO_ALL`
  `static final int`
  `SSL_ALGO_DSA`
  `static final int`
  `SSL_ALGO_RSA`
  `static final int`
  `SSL_ALGO_UNKNOWN`
  `static final int`
  `SSL_CONF_FLAG_CERTIFICATE`
  `static final int`
  `SSL_CONF_FLAG_CLIENT`
  `static final int`
  `SSL_CONF_FLAG_CMDLINE`
  `static final int`
  `SSL_CONF_FLAG_FILE`
  `static final int`
  `SSL_CONF_FLAG_SERVER`
  `static final int`
  `SSL_CONF_FLAG_SHOW_ERRORS`
  `static final int`
  `SSL_CONF_TYPE_DIR`
  `static final int`
  `SSL_CONF_TYPE_FILE`
  `static final int`
  `SSL_CONF_TYPE_STRING`
  `static final int`
  `SSL_CONF_TYPE_UNKNOWN`
  `static final int`
  `SSL_CRT_FORMAT_ASN1`
  `static final int`
  `SSL_CRT_FORMAT_ENGINE`
  `static final int`
  `SSL_CRT_FORMAT_NETSCAPE`
  `static final int`
  `SSL_CRT_FORMAT_PEM`
  `static final int`
  `SSL_CRT_FORMAT_PKCS12`
  `static final int`
  `SSL_CRT_FORMAT_SMIME`
  `static final int`
  `SSL_CRT_FORMAT_TEXT`
  `static final int`
  `SSL_CRT_FORMAT_UNDEF`
  `static final int`
  `SSL_CVERIFY_NONE`
  `static final int`
  `SSL_CVERIFY_OPTIONAL`
  `static final int`
  `SSL_CVERIFY_OPTIONAL_NO_CA`
  `static final int`
  `SSL_CVERIFY_REQUIRE`
  `static final int`
  `SSL_CVERIFY_UNSET`
  `static final int`
  `SSL_ERROR_NONE`
  `static final int`
  `SSL_ERROR_SSL`
  `static final int`
  `SSL_ERROR_SYSCALL`
  `static final int`
  `SSL_ERROR_WANT_ACCEPT`
  `static final int`
  `SSL_ERROR_WANT_CONNECT`
  `static final int`
  `SSL_ERROR_WANT_READ`
  `static final int`
  `SSL_ERROR_WANT_WRITE`
  `static final int`
  `SSL_ERROR_WANT_X509_LOOKUP`
  `static final int`
  `SSL_ERROR_ZERO_RETURN`
  `static final int`
  `SSL_INFO_CIPHER`
  `static final int`
  `SSL_INFO_CIPHER_ALGKEYSIZE`
  `static final int`
  `SSL_INFO_CIPHER_DESCRIPTION`
  `static final int`
  `SSL_INFO_CIPHER_USEKEYSIZE`
  `static final int`
  `SSL_INFO_CIPHER_VERSION`
  `static final int`
  `SSL_INFO_CLIENT_A_KEY`
  `static final int`
  `SSL_INFO_CLIENT_A_SIG`
  `static final int`
  `SSL_INFO_CLIENT_CERT`
  `static final int`
  `SSL_INFO_CLIENT_CERT_CHAIN`
  `static final int`
  `SSL_INFO_CLIENT_I_DN`
  `static final int`
  `SSL_INFO_CLIENT_M_SERIAL`
  `static final int`
  `SSL_INFO_CLIENT_M_VERSION`
  `static final int`
  `SSL_INFO_CLIENT_S_DN`
  `static final int`
  `SSL_INFO_CLIENT_V_END`
  `static final int`
  `SSL_INFO_CLIENT_V_REMAIN`
  `static final int`
  `SSL_INFO_CLIENT_V_START`
  `static final int`
  `SSL_INFO_DN_COMMONNAME`
  `static final int`
  `SSL_INFO_DN_COUNTRYNAME`
  `static final int`
  `SSL_INFO_DN_DESCRIPTION`
  `static final int`
  `SSL_INFO_DN_EMAILADDRESS`
  `static final int`
  `SSL_INFO_DN_GIVENNAME`
  `static final int`
  `SSL_INFO_DN_INITIALS`
  `static final int`
  `SSL_INFO_DN_LOCALITYNAME`
  `static final int`
  `SSL_INFO_DN_ORGANIZATIONALUNITNAME`
  `static final int`
  `SSL_INFO_DN_ORGANIZATIONNAME`
  `static final int`
  `SSL_INFO_DN_STATEORPROVINCENAME`
  `static final int`
  `SSL_INFO_DN_SURNAME`
  `static final int`
  `SSL_INFO_DN_TITLE`
  `static final int`
  `SSL_INFO_DN_UNIQUEIDENTIFIER`
  `static final int`
  `SSL_INFO_PROTOCOL`
  `static final int`
  `SSL_INFO_SERVER_A_KEY`
  `static final int`
  `SSL_INFO_SERVER_A_SIG`
  `static final int`
  `SSL_INFO_SERVER_CERT`
  `static final int`
  `SSL_INFO_SERVER_I_DN`
  `static final int`
  `SSL_INFO_SERVER_M_SERIAL`
  `static final int`
  `SSL_INFO_SERVER_M_VERSION`
  `static final int`
  `SSL_INFO_SERVER_S_DN`
  `static final int`
  `SSL_INFO_SERVER_V_END`
  `static final int`
  `SSL_INFO_SERVER_V_START`
  `static final int`
  `SSL_INFO_SESSION_ID`
  `static final int`
  `SSL_MODE_CLIENT`
  `static final int`
  `SSL_MODE_COMBINED`
  `static final int`
  `SSL_MODE_SERVER`
  `static final int`
  `SSL_OP_ALL`
  `static final int`
  `SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION`
  `static final int`
  `SSL_OP_CIPHER_SERVER_PREFERENCE`
  `static final int`
  `SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS`
  `static final int`
  `SSL_OP_EPHEMERAL_RSA`
  `static final int`
  `SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER`
  `static final int`
  `SSL_OP_MICROSOFT_SESS_ID_BUG`
  `static final int`
  `SSL_OP_MSIE_SSLV2_RSA_PADDING`
  `static final int`
  `SSL_OP_NETSCAPE_CA_DN_BUG`
  `static final int`
  `SSL_OP_NETSCAPE_CHALLENGE_BUG`
  `static final int`
  `SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG`
  `static final int`
  `SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG`
  `static final int`
  `SSL_OP_NO_COMPRESSION`
  `static final int`
  `SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION`
  `static final int`
  `SSL_OP_NO_SSLv2`
  `static final int`
  `SSL_OP_NO_SSLv3`
  `static final int`
  `SSL_OP_NO_TICKET`
  `static final int`
  `SSL_OP_NO_TLSv1`
  `static final int`
  `SSL_OP_NO_TLSv1_1`
  `static final int`
  `SSL_OP_NO_TLSv1_2`
  `static final int`
  `SSL_OP_SINGLE_DH_USE`
  `static final int`
  `SSL_OP_SINGLE_ECDH_USE`
  `static final int`
  `SSL_OP_SSLEAY_080_CLIENT_DH_BUG`
  `static final int`
  `SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG`
  `static final int`
  `SSL_OP_TLS_BLOCK_PADDING_BUG`
  `static final int`
  `SSL_OP_TLS_D5_BUG`
  `static final int`
  `SSL_OP_TLS_ROLLBACK_BUG`
  `static final int`
  `SSL_OPT_ALL`
  `static final int`
  `SSL_OPT_EXPORTCERTDATA`
  `static final int`
  `SSL_OPT_FAKEBASICAUTH`
  `static final int`
  `SSL_OPT_NONE`
  `static final int`
  `SSL_OPT_OPTRENEGOTIATE`
  `static final int`
  `SSL_OPT_RELSET`
  `static final int`
  `SSL_OPT_STDENVVARS`
  `static final int`
  `SSL_OPT_STRICTREQUIRE`
  `static final int`
  `SSL_PROTOCOL_ALL`
  `static final int`
  `SSL_PROTOCOL_NONE`
  `static final int`
  `SSL_PROTOCOL_SSLV2`
  `static final int`
  `SSL_PROTOCOL_SSLV3`
  `static final int`
  `SSL_PROTOCOL_TLSV1`
  `static final int`
  `SSL_PROTOCOL_TLSV1_1`
  `static final int`
  `SSL_PROTOCOL_TLSV1_2`
  `static final int`
  `SSL_PROTOCOL_TLSV1_3`
  `static final int`
  `SSL_RECEIVED_SHUTDOWN`
  `static final int`
  `SSL_SELECTOR_FAILURE_CHOOSE_MY_LAST_PROTOCOL`
  `static final int`
  `SSL_SELECTOR_FAILURE_NO_ADVERTISE`
  `static final int`
  `SSL_SENT_SHUTDOWN`
  `static final long`
  `SSL_SESS_CACHE_OFF`
  `static final long`
  `SSL_SESS_CACHE_SERVER`
  `static final int`
  `SSL_SHUTDOWN_TYPE_ACCURATE`
  `static final int`
  `SSL_SHUTDOWN_TYPE_STANDARD`
  `static final int`
  `SSL_SHUTDOWN_TYPE_UNCLEAN`
  `static final int`
  `SSL_SHUTDOWN_TYPE_UNSET`
  `static final int`
  `SSL_TMP_KEY_DH_1024`
  `static final int`
  `SSL_TMP_KEY_DH_2048`
  `static final int`
  `SSL_TMP_KEY_DH_4096`
  `static final int`
  `SSL_TMP_KEY_DH_512`
  `static final int`
  `SSL_TMP_KEY_MAX`
  `static final int`
  `SSL_TMP_KEY_RSA_1024`
  `static final int`
  `SSL_TMP_KEY_RSA_2048`
  `static final int`
  `SSL_TMP_KEY_RSA_4096`
  `static final int`
  `SSL_TMP_KEY_RSA_512`
  `static final int`
  `SSL_VERIFY_CLIENT_ONCE`
  `static final int`
  `SSL_VERIFY_FAIL_IF_NO_PEER_CERT`
  `static final int`
  `SSL_VERIFY_NONE`
  `static final int`
  `SSL_VERIFY_PEER`
  `static final int`
  `SSL_VERIFY_PEER_STRICT`
  `static final int`
  `UNSET`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `SSL()`

- ## Method Summary

  Modifier and Type
  Method
  Description
  `static int`
  `doHandshake(long ssl)`
  SSL_do_handshake
  `static int`
  `fipsModeGet()`
  Get the status of FIPS Mode.
  `static int`
  `fipsModeSet(int mode)`
  Enable/Disable FIPS Mode.
  `static void`
  `freeBIO(long bio)`
  BIO_free
  `static void`
  `freeSSL(long ssl)`
  SSL_free
  `static String`
  `getAlpnSelected(long ssl)`
  SSL_get0_alpn_selected
  `static String`
  `getCipherForSSL(long ssl)`
  SSL_get_cipher.
  `static String[]`
  `getCiphers(long ssl)`
  Returns all cipher suites that are enabled for negotiation in an SSL handshake.
  `static String`
  `getErrorString(long errorNumber)`
  Get the error number representing for the given `errorNumber`.
  `static int`
  `getHandshakeCount(long ssl)`
  Return the handshake completed count.
  `static int`
  `getLastErrorNumber()`
  Get the error number representing the last error OpenSSL encountered on this thread.
  `static int`
  `getOptions(long ssl)`
  Get OpenSSL Option.
  `static byte[][]`
  `getPeerCertChain(long ssl)`
  Get the peer certificate chain or `null` if none was sent.
  `static byte[]`
  `getPeerCertificate(long ssl)`
  Get the peer certificate or `null` if none was sent.
  `static int`
  `getPostHandshakeAuthInProgress(long ssl)`
  Is post handshake authentication in progress on this connection?
  `static byte[]`
  `getSessionId(long ssl)`
  Returns the ID of the session as byte array representation.
  `static int`
  `getShutdown(long ssl)`
  SSL_get_shutdown
  `static long`
  `getTime(long ssl)`
  SSL_get_time
  `static String`
  `getVersion(long ssl)`
  SSL_get_version
  `static int`
  `initialize(String engine)`
  Initialize OpenSSL support.
  `static int`
  `isInInit(long ssl)`
  SSL_in_init.
  `static long`
  `makeNetworkBIO(long ssl)`
  Wire up internal and network BIOs for the given SSL instance.
  `static long`
  `newSSL(long ctx, boolean server)`
  SSL_new
  `static int`
  `pendingReadableBytesInSSL(long ssl)`
  SSL_pending.
  `static int`
  `pendingWrittenBytesInBIO(long bio)`
  BIO_ctrl_pending.
  `static void`
  `randSet(String filename)`
  Sets global random filename.
  `static int`
  `readFromBIO(long bio, long rbuf, int rlen)`
  BIO_read.
  `static int`
  `readFromSSL(long ssl, long rbuf, int rlen)`
  SSL_read
  `static int`
  `renegotiate(long ssl)`
  SSL_renegotiate
  `static int`
  `renegotiatePending(long ssl)`
  SSL_renegotiate_pending
  `static boolean`
  `setCipherSuites(long ssl, String cipherList)`
  Set the TLSv1.2 and below ciphers available for negotiation the in TLS handshake.
  `static boolean`
  `setCipherSuitesEx(long ssl, String cipherSuites)`
  Set the TLSv1.3 cipher suites available for negotiation the in TLS handshake.
  `static void`
  `setOptions(long ssl, int options)`
  Set OpenSSL Option.
  `static void`
  `setVerify(long ssl, int level, int depth)`
  Set Type of Client Certificate verification and Maximum depth of CA Certificates in Client Certificate verification.
  `static int`
  `shutdownSSL(long ssl)`
  SSL_shutdown
  `static int`
  `verifyClientPostHandshake(long ssl)`
  SSL_verify_client_post_handshake
  `static int`
  `version()`
  `static String`
  `versionString()`
  `static int`
  `writeToBIO(long bio, long wbuf, int wlen)`
  BIO_write.
  `static int`
  `writeToSSL(long ssl, long wbuf, int wlen)`
  SSL_write.

  ### Methods inherited from class Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Field Details

  - ### UNSET

    public static final int UNSET
    See Also:
      - Constant Field Values

  - ### SSL_ALGO_UNKNOWN

    public static final int SSL_ALGO_UNKNOWN
    See Also:
      - Constant Field Values

  - ### SSL_ALGO_RSA

    public static final int SSL_ALGO_RSA
    See Also:
      - Constant Field Values

  - ### SSL_ALGO_DSA

    public static final int SSL_ALGO_DSA
    See Also:
      - Constant Field Values

  - ### SSL_ALGO_ALL

    public static final int SSL_ALGO_ALL
    See Also:
      - Constant Field Values

  - ### SSL_AIDX_RSA

    public static final int SSL_AIDX_RSA
    See Also:
      - Constant Field Values

  - ### SSL_AIDX_DSA

    public static final int SSL_AIDX_DSA
    See Also:
      - Constant Field Values

  - ### SSL_AIDX_ECC

    public static final int SSL_AIDX_ECC
    See Also:
      - Constant Field Values

  - ### SSL_AIDX_MAX

    public static final int SSL_AIDX_MAX
    See Also:
      - Constant Field Values

  - ### SSL_TMP_KEY_RSA_512

    public static final int SSL_TMP_KEY_RSA_512
    See Also:
      - Constant Field Values

  - ### SSL_TMP_KEY_RSA_1024

    public static final int SSL_TMP_KEY_RSA_1024
    See Also:
      - Constant Field Values

  - ### SSL_TMP_KEY_RSA_2048

    public static final int SSL_TMP_KEY_RSA_2048
    See Also:
      - Constant Field Values

  - ### SSL_TMP_KEY_RSA_4096

    public static final int SSL_TMP_KEY_RSA_4096
    See Also:
      - Constant Field Values

  - ### SSL_TMP_KEY_DH_512

    public static final int SSL_TMP_KEY_DH_512
    See Also:
      - Constant Field Values

  - ### SSL_TMP_KEY_DH_1024

    public static final int SSL_TMP_KEY_DH_1024
    See Also:
      - Constant Field Values

  - ### SSL_TMP_KEY_DH_2048

    public static final int SSL_TMP_KEY_DH_2048
    See Also:
      - Constant Field Values

  - ### SSL_TMP_KEY_DH_4096

    public static final int SSL_TMP_KEY_DH_4096
    See Also:
      - Constant Field Values

  - ### SSL_TMP_KEY_MAX

    public static final int SSL_TMP_KEY_MAX
    See Also:
      - Constant Field Values

  - ### SSL_OPT_NONE

    public static final int SSL_OPT_NONE
    See Also:
      - Constant Field Values

  - ### SSL_OPT_RELSET

    public static final int SSL_OPT_RELSET
    See Also:
      - Constant Field Values

  - ### SSL_OPT_STDENVVARS

    public static final int SSL_OPT_STDENVVARS
    See Also:
      - Constant Field Values

  - ### SSL_OPT_EXPORTCERTDATA

    public static final int SSL_OPT_EXPORTCERTDATA
    See Also:
      - Constant Field Values

  - ### SSL_OPT_FAKEBASICAUTH

    public static final int SSL_OPT_FAKEBASICAUTH
    See Also:
      - Constant Field Values

  - ### SSL_OPT_STRICTREQUIRE

    public static final int SSL_OPT_STRICTREQUIRE
    See Also:
      - Constant Field Values

  - ### SSL_OPT_OPTRENEGOTIATE

    public static final int SSL_OPT_OPTRENEGOTIATE
    See Also:
      - Constant Field Values

  - ### SSL_OPT_ALL

    public static final int SSL_OPT_ALL
    See Also:
      - Constant Field Values

  - ### SSL_PROTOCOL_NONE

    public static final int SSL_PROTOCOL_NONE
    See Also:
      - Constant Field Values

  - ### SSL_PROTOCOL_SSLV2

    public static final int SSL_PROTOCOL_SSLV2
    See Also:
      - Constant Field Values

  - ### SSL_PROTOCOL_SSLV3

    public static final int SSL_PROTOCOL_SSLV3
    See Also:
      - Constant Field Values

  - ### SSL_PROTOCOL_TLSV1

    public static final int SSL_PROTOCOL_TLSV1
    See Also:
      - Constant Field Values

  - ### SSL_PROTOCOL_TLSV1_1

    public static final int SSL_PROTOCOL_TLSV1_1
    See Also:
      - Constant Field Values

  - ### SSL_PROTOCOL_TLSV1_2

    public static final int SSL_PROTOCOL_TLSV1_2
    See Also:
      - Constant Field Values

  - ### SSL_PROTOCOL_TLSV1_3

    public static final int SSL_PROTOCOL_TLSV1_3
    See Also:
      - Constant Field Values

  - ### SSL_PROTOCOL_ALL

    public static final int SSL_PROTOCOL_ALL

  - ### SSL_CVERIFY_UNSET

    public static final int SSL_CVERIFY_UNSET
    See Also:
      - Constant Field Values

  - ### SSL_CVERIFY_NONE

    public static final int SSL_CVERIFY_NONE
    See Also:
      - Constant Field Values

  - ### SSL_CVERIFY_OPTIONAL

    public static final int SSL_CVERIFY_OPTIONAL
    See Also:
      - Constant Field Values

  - ### SSL_CVERIFY_REQUIRE

    public static final int SSL_CVERIFY_REQUIRE
    See Also:
      - Constant Field Values

  - ### SSL_CVERIFY_OPTIONAL_NO_CA

    public static final int SSL_CVERIFY_OPTIONAL_NO_CA
    See Also:
      - Constant Field Values

  - ### SSL_VERIFY_NONE

    public static final int SSL_VERIFY_NONE
    See Also:
      - Constant Field Values

  - ### SSL_VERIFY_PEER

    public static final int SSL_VERIFY_PEER
    See Also:
      - Constant Field Values

  - ### SSL_VERIFY_FAIL_IF_NO_PEER_CERT

    public static final int SSL_VERIFY_FAIL_IF_NO_PEER_CERT
    See Also:
      - Constant Field Values

  - ### SSL_VERIFY_CLIENT_ONCE

    public static final int SSL_VERIFY_CLIENT_ONCE
    See Also:
      - Constant Field Values

  - ### SSL_VERIFY_PEER_STRICT

    public static final int SSL_VERIFY_PEER_STRICT
    See Also:
      - Constant Field Values

  - ### SSL_OP_MICROSOFT_SESS_ID_BUG

    public static final int SSL_OP_MICROSOFT_SESS_ID_BUG
    See Also:
      - Constant Field Values

  - ### SSL_OP_NETSCAPE_CHALLENGE_BUG

    public static final int SSL_OP_NETSCAPE_CHALLENGE_BUG
    See Also:
      - Constant Field Values

  - ### SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG

    public static final int SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG
    See Also:
      - Constant Field Values

  - ### SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG

    public static final int SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG
    See Also:
      - Constant Field Values

  - ### SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER

    public static final int SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER
    See Also:
      - Constant Field Values

  - ### SSL_OP_MSIE_SSLV2_RSA_PADDING

    public static final int SSL_OP_MSIE_SSLV2_RSA_PADDING
    See Also:
      - Constant Field Values

  - ### SSL_OP_SSLEAY_080_CLIENT_DH_BUG

    public static final int SSL_OP_SSLEAY_080_CLIENT_DH_BUG
    See Also:
      - Constant Field Values

  - ### SSL_OP_TLS_D5_BUG

    public static final int SSL_OP_TLS_D5_BUG
    See Also:
      - Constant Field Values

  - ### SSL_OP_TLS_BLOCK_PADDING_BUG

    public static final int SSL_OP_TLS_BLOCK_PADDING_BUG
    See Also:
      - Constant Field Values

  - ### SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS

    public static final int SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS
    See Also:
      - Constant Field Values

  - ### SSL_OP_ALL

    public static final int SSL_OP_ALL
    See Also:
      - Constant Field Values

  - ### SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION

    public static final int SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
    See Also:
      - Constant Field Values

  - ### SSL_OP_NO_COMPRESSION

    public static final int SSL_OP_NO_COMPRESSION
    See Also:
      - Constant Field Values

  - ### SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION

    public static final int SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION
    See Also:
      - Constant Field Values

  - ### SSL_OP_SINGLE_ECDH_USE

    public static final int SSL_OP_SINGLE_ECDH_USE
    See Also:
      - Constant Field Values

  - ### SSL_OP_SINGLE_DH_USE

    public static final int SSL_OP_SINGLE_DH_USE
    See Also:
      - Constant Field Values

  - ### SSL_OP_EPHEMERAL_RSA

    public static final int SSL_OP_EPHEMERAL_RSA
    See Also:
      - Constant Field Values

  - ### SSL_OP_CIPHER_SERVER_PREFERENCE

    public static final int SSL_OP_CIPHER_SERVER_PREFERENCE
    See Also:
      - Constant Field Values

  - ### SSL_OP_TLS_ROLLBACK_BUG

    public static final int SSL_OP_TLS_ROLLBACK_BUG
    See Also:
      - Constant Field Values

  - ### SSL_OP_NO_SSLv2

    public static final int SSL_OP_NO_SSLv2
    See Also:
      - Constant Field Values

  - ### SSL_OP_NO_SSLv3

    public static final int SSL_OP_NO_SSLv3
    See Also:
      - Constant Field Values

  - ### SSL_OP_NO_TLSv1

    public static final int SSL_OP_NO_TLSv1
    See Also:
      - Constant Field Values

  - ### SSL_OP_NO_TLSv1_2

    public static final int SSL_OP_NO_TLSv1_2
    See Also:
      - Constant Field Values

  - ### SSL_OP_NO_TLSv1_1

    public static final int SSL_OP_NO_TLSv1_1
    See Also:
      - Constant Field Values

  - ### SSL_OP_NO_TICKET

    public static final int SSL_OP_NO_TICKET
    See Also:
      - Constant Field Values

  - ### SSL_OP_NETSCAPE_CA_DN_BUG

    public static final int SSL_OP_NETSCAPE_CA_DN_BUG
    See Also:
      - Constant Field Values

  - ### SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG

    public static final int SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG
    See Also:
      - Constant Field Values

  - ### SSL_CRT_FORMAT_UNDEF

    public static final int SSL_CRT_FORMAT_UNDEF
    See Also:
      - Constant Field Values

  - ### SSL_CRT_FORMAT_ASN1

    public static final int SSL_CRT_FORMAT_ASN1
    See Also:
      - Constant Field Values

  - ### SSL_CRT_FORMAT_TEXT

    public static final int SSL_CRT_FORMAT_TEXT
    See Also:
      - Constant Field Values

  - ### SSL_CRT_FORMAT_PEM

    public static final int SSL_CRT_FORMAT_PEM
    See Also:
      - Constant Field Values

  - ### SSL_CRT_FORMAT_NETSCAPE

    public static final int SSL_CRT_FORMAT_NETSCAPE
    See Also:
      - Constant Field Values

  - ### SSL_CRT_FORMAT_PKCS12

    public static final int SSL_CRT_FORMAT_PKCS12
    See Also:
      - Constant Field Values

  - ### SSL_CRT_FORMAT_SMIME

    public static final int SSL_CRT_FORMAT_SMIME
    See Also:
      - Constant Field Values

  - ### SSL_CRT_FORMAT_ENGINE

    public static final int SSL_CRT_FORMAT_ENGINE
    See Also:
      - Constant Field Values

  - ### SSL_MODE_CLIENT

    public static final int SSL_MODE_CLIENT
    See Also:
      - Constant Field Values

  - ### SSL_MODE_SERVER

    public static final int SSL_MODE_SERVER
    See Also:
      - Constant Field Values

  - ### SSL_MODE_COMBINED

    public static final int SSL_MODE_COMBINED
    See Also:
      - Constant Field Values

  - ### SSL_CONF_FLAG_CMDLINE

    public static final int SSL_CONF_FLAG_CMDLINE
    See Also:
      - Constant Field Values

  - ### SSL_CONF_FLAG_FILE

    public static final int SSL_CONF_FLAG_FILE
    See Also:
      - Constant Field Values

  - ### SSL_CONF_FLAG_CLIENT

    public static final int SSL_CONF_FLAG_CLIENT
    See Also:
      - Constant Field Values

  - ### SSL_CONF_FLAG_SERVER

    public static final int SSL_CONF_FLAG_SERVER
    See Also:
      - Constant Field Values

  - ### SSL_CONF_FLAG_SHOW_ERRORS

    public static final int SSL_CONF_FLAG_SHOW_ERRORS
    See Also:
      - Constant Field Values

  - ### SSL_CONF_FLAG_CERTIFICATE

    public static final int SSL_CONF_FLAG_CERTIFICATE
    See Also:
      - Constant Field Values

  - ### SSL_CONF_TYPE_UNKNOWN

    public static final int SSL_CONF_TYPE_UNKNOWN
    See Also:
      - Constant Field Values

  - ### SSL_CONF_TYPE_STRING

    public static final int SSL_CONF_TYPE_STRING
    See Also:
      - Constant Field Values

  - ### SSL_CONF_TYPE_FILE

    public static final int SSL_CONF_TYPE_FILE
    See Also:
      - Constant Field Values

  - ### SSL_CONF_TYPE_DIR

    public static final int SSL_CONF_TYPE_DIR
    See Also:
      - Constant Field Values

  - ### SSL_SHUTDOWN_TYPE_UNSET

    public static final int SSL_SHUTDOWN_TYPE_UNSET
    See Also:
      - Constant Field Values

  - ### SSL_SHUTDOWN_TYPE_STANDARD

    public static final int SSL_SHUTDOWN_TYPE_STANDARD
    See Also:
      - Constant Field Values

  - ### SSL_SHUTDOWN_TYPE_UNCLEAN

    public static final int SSL_SHUTDOWN_TYPE_UNCLEAN
    See Also:
      - Constant Field Values

  - ### SSL_SHUTDOWN_TYPE_ACCURATE

    public static final int SSL_SHUTDOWN_TYPE_ACCURATE
    See Also:
      - Constant Field Values

  - ### SSL_INFO_SESSION_ID

    public static final int SSL_INFO_SESSION_ID
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CIPHER

    public static final int SSL_INFO_CIPHER
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CIPHER_USEKEYSIZE

    public static final int SSL_INFO_CIPHER_USEKEYSIZE
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CIPHER_ALGKEYSIZE

    public static final int SSL_INFO_CIPHER_ALGKEYSIZE
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CIPHER_VERSION

    public static final int SSL_INFO_CIPHER_VERSION
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CIPHER_DESCRIPTION

    public static final int SSL_INFO_CIPHER_DESCRIPTION
    See Also:
      - Constant Field Values

  - ### SSL_INFO_PROTOCOL

    public static final int SSL_INFO_PROTOCOL
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CLIENT_S_DN

    public static final int SSL_INFO_CLIENT_S_DN
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CLIENT_I_DN

    public static final int SSL_INFO_CLIENT_I_DN
    See Also:
      - Constant Field Values

  - ### SSL_INFO_SERVER_S_DN

    public static final int SSL_INFO_SERVER_S_DN
    See Also:
      - Constant Field Values

  - ### SSL_INFO_SERVER_I_DN

    public static final int SSL_INFO_SERVER_I_DN
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_COUNTRYNAME

    public static final int SSL_INFO_DN_COUNTRYNAME
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_STATEORPROVINCENAME

    public static final int SSL_INFO_DN_STATEORPROVINCENAME
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_LOCALITYNAME

    public static final int SSL_INFO_DN_LOCALITYNAME
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_ORGANIZATIONNAME

    public static final int SSL_INFO_DN_ORGANIZATIONNAME
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_ORGANIZATIONALUNITNAME

    public static final int SSL_INFO_DN_ORGANIZATIONALUNITNAME
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_COMMONNAME

    public static final int SSL_INFO_DN_COMMONNAME
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_TITLE

    public static final int SSL_INFO_DN_TITLE
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_INITIALS

    public static final int SSL_INFO_DN_INITIALS
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_GIVENNAME

    public static final int SSL_INFO_DN_GIVENNAME
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_SURNAME

    public static final int SSL_INFO_DN_SURNAME
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_DESCRIPTION

    public static final int SSL_INFO_DN_DESCRIPTION
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_UNIQUEIDENTIFIER

    public static final int SSL_INFO_DN_UNIQUEIDENTIFIER
    See Also:
      - Constant Field Values

  - ### SSL_INFO_DN_EMAILADDRESS

    public static final int SSL_INFO_DN_EMAILADDRESS
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CLIENT_M_VERSION

    public static final int SSL_INFO_CLIENT_M_VERSION
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CLIENT_M_SERIAL

    public static final int SSL_INFO_CLIENT_M_SERIAL
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CLIENT_V_START

    public static final int SSL_INFO_CLIENT_V_START
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CLIENT_V_END

    public static final int SSL_INFO_CLIENT_V_END
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CLIENT_A_SIG

    public static final int SSL_INFO_CLIENT_A_SIG
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CLIENT_A_KEY

    public static final int SSL_INFO_CLIENT_A_KEY
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CLIENT_CERT

    public static final int SSL_INFO_CLIENT_CERT
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CLIENT_V_REMAIN

    public static final int SSL_INFO_CLIENT_V_REMAIN
    See Also:
      - Constant Field Values

  - ### SSL_INFO_SERVER_M_VERSION

    public static final int SSL_INFO_SERVER_M_VERSION
    See Also:
      - Constant Field Values

  - ### SSL_INFO_SERVER_M_SERIAL

    public static final int SSL_INFO_SERVER_M_SERIAL
    See Also:
      - Constant Field Values

  - ### SSL_INFO_SERVER_V_START

    public static final int SSL_INFO_SERVER_V_START
    See Also:
      - Constant Field Values

  - ### SSL_INFO_SERVER_V_END

    public static final int SSL_INFO_SERVER_V_END
    See Also:
      - Constant Field Values

  - ### SSL_INFO_SERVER_A_SIG

    public static final int SSL_INFO_SERVER_A_SIG
    See Also:
      - Constant Field Values

  - ### SSL_INFO_SERVER_A_KEY

    public static final int SSL_INFO_SERVER_A_KEY
    See Also:
      - Constant Field Values

  - ### SSL_INFO_SERVER_CERT

    public static final int SSL_INFO_SERVER_CERT
    See Also:
      - Constant Field Values

  - ### SSL_INFO_CLIENT_CERT_CHAIN

    public static final int SSL_INFO_CLIENT_CERT_CHAIN
    See Also:
      - Constant Field Values

  - ### SSL_SESS_CACHE_OFF

    public static final long SSL_SESS_CACHE_OFF
    See Also:
      - Constant Field Values

  - ### SSL_SESS_CACHE_SERVER

    public static final long SSL_SESS_CACHE_SERVER
    See Also:
      - Constant Field Values

  - ### SSL_SELECTOR_FAILURE_NO_ADVERTISE

    public static final int SSL_SELECTOR_FAILURE_NO_ADVERTISE
    See Also:
      - Constant Field Values

  - ### SSL_SELECTOR_FAILURE_CHOOSE_MY_LAST_PROTOCOL

    public static final int SSL_SELECTOR_FAILURE_CHOOSE_MY_LAST_PROTOCOL
    See Also:
      - Constant Field Values

  - ### SSL_SENT_SHUTDOWN

    public static final int SSL_SENT_SHUTDOWN
    See Also:
      - Constant Field Values

  - ### SSL_RECEIVED_SHUTDOWN

    public static final int SSL_RECEIVED_SHUTDOWN
    See Also:
      - Constant Field Values

  - ### SSL_ERROR_NONE

    public static final int SSL_ERROR_NONE
    See Also:
      - Constant Field Values

  - ### SSL_ERROR_SSL

    public static final int SSL_ERROR_SSL
    See Also:
      - Constant Field Values

  - ### SSL_ERROR_WANT_READ

    public static final int SSL_ERROR_WANT_READ
    See Also:
      - Constant Field Values

  - ### SSL_ERROR_WANT_WRITE

    public static final int SSL_ERROR_WANT_WRITE
    See Also:
      - Constant Field Values

  - ### SSL_ERROR_WANT_X509_LOOKUP

    public static final int SSL_ERROR_WANT_X509_LOOKUP
    See Also:
      - Constant Field Values

  - ### SSL_ERROR_SYSCALL

    public static final int SSL_ERROR_SYSCALL
    See Also:
      - Constant Field Values

  - ### SSL_ERROR_ZERO_RETURN

    public static final int SSL_ERROR_ZERO_RETURN
    See Also:
      - Constant Field Values

  - ### SSL_ERROR_WANT_CONNECT

    public static final int SSL_ERROR_WANT_CONNECT
    See Also:
      - Constant Field Values

  - ### SSL_ERROR_WANT_ACCEPT

    public static final int SSL_ERROR_WANT_ACCEPT
    See Also:
      - Constant Field Values

- ## Constructor Details

  - ### SSL

    public SSL()

- ## Method Details

  - ### version

    public static int version()

  - ### versionString

    public static String versionString()

  - ### initialize

    public static int initialize(String engine)
    Initialize OpenSSL support. This function needs to be called once for the lifetime of JVM. Library.init() has to be called before.
    Parameters:
      `engine` - Support for external a Crypto Device ("engine"), usually a hardware accelerator card for crypto operations.
    Returns:
      APR status code

  - ### fipsModeGet

    public static int fipsModeGet() throws Exception
    Get the status of FIPS Mode.
    Returns:
      FIPS_mode return code. It is `0` if OpenSSL is not in FIPS mode, `1` if OpenSSL is in FIPS Mode.
    Throws:
      `Exception` - If tcnative was not compiled with FIPS Mode available.
    See Also:
      - OpenSSL method FIPS_mode()

  - ### fipsModeSet

    public static int fipsModeSet(int mode) throws Exception
    Enable/Disable FIPS Mode.
    Parameters:
      `mode` - 1 - enable, 0 - disable
    Returns:
      FIPS_mode_set return code
    Throws:
      `Exception` - If tcnative was not compiled with FIPS Mode available, or if `FIPS_mode_set()` call returned an error value.
    See Also:
      - OpenSSL method FIPS_mode_set()

  - ### randSet

    public static void randSet(String filename)
    Sets global random filename.
    Parameters:
      `filename` - Filename to use. If set it will be used for SSL initialization and all contexts where explicitly not set.

  - ### getHandshakeCount

    public static int getHandshakeCount(long ssl)
    Return the handshake completed count.
    Parameters:
      `ssl` - SSL pointer
    Returns:
      the count

  - ### newSSL

    public static long newSSL(long ctx, boolean server)
    SSL_new
    Parameters:
      `ctx` - Server or Client context to use.
      `server` - if true configure SSL instance to use accept handshake routines if false configure SSL instance to use connect handshake routines
    Returns:
      pointer to SSL instance (SSL *)

  - ### pendingWrittenBytesInBIO

    public static int pendingWrittenBytesInBIO(long bio)
    BIO_ctrl_pending.
    Parameters:
      `bio` - BIO pointer (BIO *)
    Returns:
      the pending bytes count

  - ### pendingReadableBytesInSSL

    public static int pendingReadableBytesInSSL(long ssl)
    SSL_pending.
    Parameters:
      `ssl` - SSL pointer (SSL *)
    Returns:
      the pending bytes count

  - ### writeToBIO

    public static int writeToBIO(long bio, long wbuf, int wlen)
    BIO_write.
    Parameters:
      `bio` - BIO pointer
      `wbuf` - Buffer pointer
      `wlen` - Write length
    Returns:
      the bytes count written

  - ### readFromBIO

    public static int readFromBIO(long bio, long rbuf, int rlen)
    BIO_read.
    Parameters:
      `bio` - BIO pointer
      `rbuf` - Buffer pointer
      `rlen` - Read length
    Returns:
      the bytes count read

  - ### writeToSSL

    public static int writeToSSL(long ssl, long wbuf, int wlen)
    SSL_write.
    Parameters:
      `ssl` - the SSL instance (SSL *)
      `wbuf` - Buffer pointer
      `wlen` - Write length
    Returns:
      the bytes count written

  - ### readFromSSL

    public static int readFromSSL(long ssl, long rbuf, int rlen)
    SSL_read
    Parameters:
      `ssl` - the SSL instance (SSL *)
      `rbuf` - Buffer pointer
      `rlen` - Read length
    Returns:
      the bytes count read

  - ### getShutdown

    public static int getShutdown(long ssl)
    SSL_get_shutdown
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the operation status

  - ### freeSSL

    public static void freeSSL(long ssl)
    SSL_free
    Parameters:
      `ssl` - the SSL instance (SSL *)

  - ### makeNetworkBIO

    public static long makeNetworkBIO(long ssl)
    Wire up internal and network BIOs for the given SSL instance.

    Warning: you must explicitly free this resource by calling freeBIO

    While the SSL's internal/application data BIO will be freed when freeSSL is called on the provided SSL instance, you must call freeBIO on the returned network BIO.

    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      pointer to the Network BIO (BIO *)

  - ### freeBIO

    public static void freeBIO(long bio)
    BIO_free
    Parameters:
      `bio` - BIO pointer

  - ### shutdownSSL

    public static int shutdownSSL(long ssl)
    SSL_shutdown
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the operation status

  - ### getLastErrorNumber

    public static int getLastErrorNumber()
    Get the error number representing the last error OpenSSL encountered on this thread.
    Returns:
      the last error number

  - ### getCipherForSSL

    public static String getCipherForSSL(long ssl)
    SSL_get_cipher.
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the cipher name

  - ### getVersion

    public static String getVersion(long ssl)
    SSL_get_version
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the SSL version in use

  - ### doHandshake

    public static int doHandshake(long ssl)
    SSL_do_handshake
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the handshake status

  - ### renegotiate

    public static int renegotiate(long ssl)
    SSL_renegotiate
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the operation status

  - ### renegotiatePending

    public static int renegotiatePending(long ssl)
    SSL_renegotiate_pending
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the operation status

  - ### verifyClientPostHandshake

    public static int verifyClientPostHandshake(long ssl)
    SSL_verify_client_post_handshake
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the operation status

  - ### getPostHandshakeAuthInProgress

    public static int getPostHandshakeAuthInProgress(long ssl)
    Is post handshake authentication in progress on this connection?
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the operation status

  - ### isInInit

    public static int isInInit(long ssl)
    SSL_in_init.
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the status

  - ### getAlpnSelected

    public static String getAlpnSelected(long ssl)
    SSL_get0_alpn_selected
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the ALPN protocol negotiated

  - ### getPeerCertChain

    public static byte[][] getPeerCertChain(long ssl)
    Get the peer certificate chain or `null` if none was sent.
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the certificate chain bytes

  - ### getPeerCertificate

    public static byte[] getPeerCertificate(long ssl)
    Get the peer certificate or `null` if none was sent.
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the certificate bytes

  - ### getErrorString

    public static String getErrorString(long errorNumber)
    Get the error number representing for the given `errorNumber`.
    Parameters:
      `errorNumber` - The error code
    Returns:
      an error message

  - ### getTime

    public static long getTime(long ssl)
    SSL_get_time
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      returns the time at which the session ssl was established. The time is given in seconds since the Epoch

  - ### setVerify

    public static void setVerify(long ssl, int level, int depth)
    Set Type of Client Certificate verification and Maximum depth of CA Certificates in Client Certificate verification.
    This directive sets the Certificate verification level for the Client Authentication. Notice that this directive can be used both in per-server and per-directory context. In per-server context it applies to the client authentication process used in the standard SSL handshake when a connection is established. In per-directory context it forces an SSL renegotiation with the reconfigured client verification level after the HTTP request was read but before the HTTP response is sent.
    The following levels are available for level:

        SSL_CVERIFY_NONE           - No client Certificate is required at all
        SSL_CVERIFY_OPTIONAL       - The client may present a valid Certificate
        SSL_CVERIFY_REQUIRE        - The client has to present a valid Certificate
        SSL_CVERIFY_OPTIONAL_NO_CA - The client may present a valid Certificate
                                     but it need not to be (successfully) verifiable

    The depth actually is the maximum number of intermediate certificate issuers, i.e. the number of CA certificates which are max allowed to be followed while verifying the client certificate. A depth of 0 means that self-signed client certificates are accepted only, the default depth of 1 means the client certificate can be self-signed or has to be signed by a CA which is directly known to the server (i.e. the CA's certificate is under `setCACertificatePath`, etc).
    Parameters:
      `ssl` - the SSL instance (SSL *)
      `level` - Type of Client Certificate verification.
      `depth` - Maximum depth of CA Certificates in Client Certificate verification.

  - ### setOptions

    public static void setOptions(long ssl, int options)
    Set OpenSSL Option.
    Parameters:
      `ssl` - the SSL instance (SSL *)
      `options` - See SSL.SSL_OP_* for option flags.

  - ### getOptions

    public static int getOptions(long ssl)
    Get OpenSSL Option.
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      options See SSL.SSL_OP_* for option flags.

  - ### getCiphers

    public static String[] getCiphers(long ssl)
    Returns all cipher suites that are enabled for negotiation in an SSL handshake.
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      ciphers

  - ### setCipherSuites

    public static boolean setCipherSuites(long ssl, String cipherList) throws Exception
    Set the TLSv1.2 and below ciphers available for negotiation the in TLS handshake.

    This complex directive uses a colon-separated cipher-spec string consisting of OpenSSL cipher specifications to configure the ciphers the client is permitted to negotiate in the TLS handshake phase.

    Parameters:
      `ssl` - The SSL instance (SSL *)
      `cipherList` - An OpenSSL cipher specification.
    Returns:
      `true` if the operation was successful
    Throws:
      `Exception` - An error occurred

  - ### setCipherSuitesEx

    public static boolean setCipherSuitesEx(long ssl, String cipherSuites) throws Exception
    Set the TLSv1.3 cipher suites available for negotiation the in TLS handshake.

    This uses a colon-separated list of TLSv1.3 cipher suite names in preference order.

    Parameters:
      `ssl` - The SSL instance (SSL *)
      `cipherSuites` - An OpenSSL cipher suite list.
    Returns:
      `true` if the operation was successful
    Throws:
      `Exception` - An error occurred

  - ### getSessionId

    public static byte[] getSessionId(long ssl)
    Returns the ID of the session as byte array representation.
    Parameters:
      `ssl` - the SSL instance (SSL *)
    Returns:
      the session as byte array representation obtained via SSL_SESSION_get_id.