MATRIX.md

Symbol	curl1	nginx2	haproxy3	implemented?
BIO_f_ssl	✅			✅
BIO_new_buffer_ssl_connect
BIO_new_ssl
BIO_new_ssl_connect
BIO_ssl_copy_session_id
BIO_ssl_shutdown
DTLS_client_method
DTLS_get_data_mtu
DTLS_method
DTLS_server_method
DTLS_set_timer_cb
DTLSv1_2_client_method 4 5
DTLSv1_2_method 4 5
DTLSv1_2_server_method 4 5
DTLSv1_client_method 4 6
DTLSv1_listen 7
DTLSv1_method 4 6
DTLSv1_server_method 4 6
ERR_load_SSL_strings 8				✅
OPENSSL_cipher_name
OPENSSL_init_ssl	✅	✅		✅
OSSL_default_cipher_list
OSSL_default_ciphersuites
PEM_read_SSL_SESSION 9
PEM_read_bio_SSL_SESSION
PEM_write_SSL_SESSION 9
PEM_write_bio_SSL_SESSION
SRP_Calc_A_param 8 10
SSL_CIPHER_description		✅		✅
SSL_CIPHER_find		✅	✅	✅
SSL_CIPHER_get_auth_nid			✅	✅
SSL_CIPHER_get_bits			✅	✅
SSL_CIPHER_get_cipher_nid
SSL_CIPHER_get_digest_nid
SSL_CIPHER_get_handshake_digest
SSL_CIPHER_get_id		✅	✅	✅
SSL_CIPHER_get_kx_nid				✅
SSL_CIPHER_get_name	✅	✅	✅	✅
SSL_CIPHER_get_protocol_id				✅
SSL_CIPHER_get_version				✅
SSL_CIPHER_is_aead
SSL_CIPHER_standard_name				✅
SSL_COMP_add_compression_method
SSL_COMP_get0_name
SSL_COMP_get_compression_methods				❗ 11
SSL_COMP_get_id
SSL_COMP_get_name
SSL_COMP_set0_compression_methods
SSL_CONF_CTX_clear_flags				✅
SSL_CONF_CTX_finish		✅		✅
SSL_CONF_CTX_free		✅		✅
SSL_CONF_CTX_new		✅		✅
SSL_CONF_CTX_set1_prefix				✅
SSL_CONF_CTX_set_flags		✅		✅
SSL_CONF_CTX_set_ssl				✅
SSL_CONF_CTX_set_ssl_ctx		✅		✅
SSL_CONF_cmd		✅		✅
SSL_CONF_cmd_argv
SSL_CONF_cmd_value_type		✅		✅
SSL_CTX_SRP_CTX_free 8 10
SSL_CTX_SRP_CTX_init 8 10
SSL_CTX_add1_to_CA_list
SSL_CTX_add_client_CA	✅			❗ 11
SSL_CTX_add_client_custom_ext
SSL_CTX_add_custom_ext		✅	✅	❗ 11
SSL_CTX_add_server_custom_ext			✅	✅
SSL_CTX_add_session
SSL_CTX_callback_ctrl		✅	✅	✅
SSL_CTX_check_private_key	✅		✅	✅
SSL_CTX_clear_options		✅		✅
SSL_CTX_config
SSL_CTX_ct_is_enabled 12
SSL_CTX_ctrl	✅	✅	✅	✅
SSL_CTX_dane_clear_flags
SSL_CTX_dane_enable
SSL_CTX_dane_mtype_set
SSL_CTX_dane_set_flags
SSL_CTX_enable_ct 12
SSL_CTX_flush_sessions
SSL_CTX_free	✅	✅	✅	✅
SSL_CTX_get0_CA_list
SSL_CTX_get0_certificate				✅
SSL_CTX_get0_ctlog_store 12
SSL_CTX_get0_param
SSL_CTX_get0_privatekey			✅	✅
SSL_CTX_get0_security_ex_data
SSL_CTX_get_cert_store	✅	✅	✅	✅
SSL_CTX_get_ciphers
SSL_CTX_get_client_CA_list		✅	✅	❗ 11
SSL_CTX_get_client_cert_cb
SSL_CTX_get_default_passwd_cb
SSL_CTX_get_default_passwd_cb_userdata
SSL_CTX_get_ex_data		✅	✅	✅
SSL_CTX_get_info_callback
SSL_CTX_get_keylog_callback
SSL_CTX_get_max_early_data		✅		✅
SSL_CTX_get_num_tickets				✅
SSL_CTX_get_options		✅		✅
SSL_CTX_get_quiet_shutdown
SSL_CTX_get_record_padding_callback_arg
SSL_CTX_get_recv_max_early_data
SSL_CTX_get_security_callback
SSL_CTX_get_security_level
SSL_CTX_get_ssl_method
SSL_CTX_get_timeout		✅		✅
SSL_CTX_get_verify_callback		✅		✅
SSL_CTX_get_verify_depth		✅		✅
SSL_CTX_get_verify_mode		✅	✅	✅
SSL_CTX_has_client_custom_ext		✅	✅	❗ 11
SSL_CTX_load_verify_dir	✅			✅
SSL_CTX_load_verify_file	✅			✅
SSL_CTX_load_verify_locations		✅		✅
SSL_CTX_load_verify_store
SSL_CTX_new	✅	✅	✅	✅
SSL_CTX_new_ex
SSL_CTX_remove_session		✅		❗ 11
SSL_CTX_sess_get_get_cb
SSL_CTX_sess_get_new_cb
SSL_CTX_sess_get_remove_cb
SSL_CTX_sess_set_get_cb		✅	✅	✅
SSL_CTX_sess_set_new_cb	✅	✅	✅	✅
SSL_CTX_sess_set_remove_cb		✅	✅	✅
SSL_CTX_sessions
SSL_CTX_set0_CA_list
SSL_CTX_set0_ctlog_store 12
SSL_CTX_set0_security_ex_data
SSL_CTX_set0_tmp_dh_pkey			✅	❗ 11
SSL_CTX_set1_cert_store
SSL_CTX_set1_param
SSL_CTX_set_allow_early_data_cb
SSL_CTX_set_alpn_protos	✅	✅	✅	✅
SSL_CTX_set_alpn_select_cb		✅	✅	✅
SSL_CTX_set_async_callback
SSL_CTX_set_async_callback_arg
SSL_CTX_set_block_padding
SSL_CTX_set_cert_cb		✅		✅
SSL_CTX_set_cert_store	✅			✅
SSL_CTX_set_cert_verify_callback
SSL_CTX_set_cipher_list	✅	✅	✅	✅
SSL_CTX_set_ciphersuites	✅		✅	❗ 11
SSL_CTX_set_client_CA_list		✅	✅	❗ 11
SSL_CTX_set_client_cert_cb				❗ 11
SSL_CTX_set_client_cert_engine 13
SSL_CTX_set_client_hello_cb			✅	✅
SSL_CTX_set_cookie_generate_cb
SSL_CTX_set_cookie_verify_cb
SSL_CTX_set_ct_validation_callback 12
SSL_CTX_set_ctlog_list_file 12
SSL_CTX_set_default_ctlog_list_file 12
SSL_CTX_set_default_passwd_cb	✅			❗ 11
SSL_CTX_set_default_passwd_cb_userdata	✅			❗ 11
SSL_CTX_set_default_read_buffer_len
SSL_CTX_set_default_verify_dir				✅
SSL_CTX_set_default_verify_file				✅
SSL_CTX_set_default_verify_paths				✅
SSL_CTX_set_default_verify_store				❗ 11
SSL_CTX_set_ex_data		✅	✅	✅
SSL_CTX_set_generate_session_id
SSL_CTX_set_info_callback		✅	✅	✅
SSL_CTX_set_keylog_callback	✅	✅	✅	❗ 11
SSL_CTX_set_max_early_data		✅		✅
SSL_CTX_set_msg_callback	✅		✅	✅
SSL_CTX_set_next_proto_select_cb 14	✅		✅	❗ 11
SSL_CTX_set_next_protos_advertised_cb 14		✅	✅	❗ 11
SSL_CTX_set_not_resumable_session_callback
SSL_CTX_set_num_tickets				✅
SSL_CTX_set_options	✅	✅	✅	✅
SSL_CTX_set_post_handshake_auth	✅			❗ 11
SSL_CTX_set_psk_client_callback 15
SSL_CTX_set_psk_find_session_callback
SSL_CTX_set_psk_server_callback 15
SSL_CTX_set_psk_use_session_callback
SSL_CTX_set_purpose
SSL_CTX_set_quiet_shutdown
SSL_CTX_set_record_padding_callback
SSL_CTX_set_record_padding_callback_arg
SSL_CTX_set_recv_max_early_data
SSL_CTX_set_security_callback
SSL_CTX_set_security_level				✅
SSL_CTX_set_session_id_context		✅	✅	✅
SSL_CTX_set_session_ticket_cb
SSL_CTX_set_srp_cb_arg 8 10				❗ 11
SSL_CTX_set_srp_client_pwd_callback 8 10
SSL_CTX_set_srp_password 8 10	✅			❗ 11
SSL_CTX_set_srp_strength 8 10
SSL_CTX_set_srp_username 8 10	✅			❗ 11
SSL_CTX_set_srp_username_callback 8 10				❗ 11
SSL_CTX_set_srp_verify_param_callback 8 10
SSL_CTX_set_ssl_version 8
SSL_CTX_set_stateless_cookie_generate_cb
SSL_CTX_set_stateless_cookie_verify_cb
SSL_CTX_set_timeout		✅	✅	✅
SSL_CTX_set_tlsext_max_fragment_length
SSL_CTX_set_tlsext_ticket_key_evp_cb			✅	❗ 11
SSL_CTX_set_tlsext_use_srtp 16
SSL_CTX_set_tmp_dh_callback 8 17				❗ 11
SSL_CTX_set_trust
SSL_CTX_set_verify	✅	✅	✅	✅
SSL_CTX_set_verify_depth		✅		✅
SSL_CTX_up_ref			✅	✅
SSL_CTX_use_PrivateKey	✅	✅	✅	✅
SSL_CTX_use_PrivateKey_ASN1
SSL_CTX_use_PrivateKey_file	✅			✅
SSL_CTX_use_RSAPrivateKey 8
SSL_CTX_use_RSAPrivateKey_ASN1 8
SSL_CTX_use_RSAPrivateKey_file 8
SSL_CTX_use_cert_and_key
SSL_CTX_use_certificate	✅	✅	✅	✅
SSL_CTX_use_certificate_ASN1
SSL_CTX_use_certificate_chain_file	✅			✅
SSL_CTX_use_certificate_file	✅			❗ 11
SSL_CTX_use_psk_identity_hint 15
SSL_CTX_use_serverinfo
SSL_CTX_use_serverinfo_ex
SSL_CTX_use_serverinfo_file
SSL_SESSION_dup
SSL_SESSION_free	✅	✅	✅	✅
SSL_SESSION_get0_alpn_selected
SSL_SESSION_get0_cipher
SSL_SESSION_get0_hostname				❗ 11
SSL_SESSION_get0_id_context
SSL_SESSION_get0_peer
SSL_SESSION_get0_ticket
SSL_SESSION_get0_ticket_appdata
SSL_SESSION_get_compress_id				❗ 11
SSL_SESSION_get_ex_data
SSL_SESSION_get_id		✅	✅	✅
SSL_SESSION_get_master_key			✅	❗ 11
SSL_SESSION_get_max_early_data			✅	❗ 11
SSL_SESSION_get_max_fragment_length
SSL_SESSION_get_protocol_version
SSL_SESSION_get_ticket_lifetime_hint
SSL_SESSION_get_time		✅		✅
SSL_SESSION_get_timeout		✅		✅
SSL_SESSION_has_ticket
SSL_SESSION_is_resumable
SSL_SESSION_new
SSL_SESSION_print
SSL_SESSION_print_fp 9
SSL_SESSION_print_keylog
SSL_SESSION_set1_alpn_selected
SSL_SESSION_set1_hostname
SSL_SESSION_set1_id			✅	✅
SSL_SESSION_set1_id_context		✅	✅	✅
SSL_SESSION_set1_master_key
SSL_SESSION_set1_ticket_appdata
SSL_SESSION_set_cipher
SSL_SESSION_set_ex_data
SSL_SESSION_set_max_early_data
SSL_SESSION_set_protocol_version
SSL_SESSION_set_time		✅		✅
SSL_SESSION_set_timeout		✅		✅
SSL_SESSION_up_ref		✅		✅
SSL_SRP_CTX_free 8 10
SSL_SRP_CTX_init 8 10
SSL_accept				✅
SSL_add1_host
SSL_add1_to_CA_list
SSL_add_client_CA
SSL_add_dir_cert_subjects_to_stack
SSL_add_file_cert_subjects_to_stack				❗ 11
SSL_add_ssl_module
SSL_add_store_cert_subjects_to_stack
SSL_alert_desc_string				✅
SSL_alert_desc_string_long	✅			✅
SSL_alert_type_string				✅
SSL_alert_type_string_long				✅
SSL_alloc_buffers
SSL_bytes_to_cipher_list
SSL_callback_ctrl
SSL_certs_clear
SSL_check_chain
SSL_check_private_key				✅
SSL_clear
SSL_clear_options		✅		✅
SSL_client_hello_get0_ciphers			✅	❗ 11
SSL_client_hello_get0_compression_methods
SSL_client_hello_get0_ext			✅	❗ 11
SSL_client_hello_get0_legacy_version
SSL_client_hello_get0_random
SSL_client_hello_get0_session_id
SSL_client_hello_get1_extensions_present
SSL_client_hello_isv2
SSL_client_version
SSL_config
SSL_connect	✅			✅
SSL_copy_session_id
SSL_ct_is_enabled 12
SSL_ctrl	✅	✅	✅	✅
SSL_dane_clear_flags
SSL_dane_enable
SSL_dane_set_flags
SSL_dane_tlsa_add
SSL_do_handshake		✅	✅	✅
SSL_dup
SSL_dup_CA_list			✅	❗ 11
SSL_enable_ct 12
SSL_export_keying_material
SSL_export_keying_material_early
SSL_extension_supported
SSL_free	✅	✅	✅	✅
SSL_free_buffers
SSL_get0_CA_list
SSL_get0_alpn_selected	✅	✅	✅	✅
SSL_get0_dane
SSL_get0_dane_authority
SSL_get0_dane_tlsa
SSL_get0_next_proto_negotiated 14		✅	✅	❗ 11
SSL_get0_param
SSL_get0_peer_CA_list
SSL_get0_peer_certificate				✅
SSL_get0_peer_scts 12
SSL_get0_peername
SSL_get0_security_ex_data
SSL_get0_verified_chain	✅	✅	✅	✅
SSL_get1_peer_certificate	✅	✅	✅	✅
SSL_get1_session		✅		✅
SSL_get1_supported_ciphers
SSL_get_SSL_CTX		✅	✅	✅
SSL_get_all_async_fds			✅	❗ 11
SSL_get_async_status
SSL_get_certificate	✅	✅	✅	✅
SSL_get_changed_async_fds			✅	❗ 11
SSL_get_cipher_list
SSL_get_ciphers				❗ 11
SSL_get_client_CA_list				❗ 11
SSL_get_client_ciphers
SSL_get_client_random			✅	❗ 11
SSL_get_current_cipher	✅	✅	✅	✅
SSL_get_current_compression				✅
SSL_get_current_expansion
SSL_get_default_passwd_cb
SSL_get_default_passwd_cb_userdata
SSL_get_default_timeout
SSL_get_early_data_status			✅	✅
SSL_get_error	✅	✅	✅	✅
SSL_get_ex_data	✅	✅	✅	✅
SSL_get_ex_data_X509_STORE_CTX_idx		✅	✅	❗ 11
SSL_get_fd
SSL_get_finished			✅	❗ 11
SSL_get_info_callback
SSL_get_key_update_type
SSL_get_max_early_data
SSL_get_num_tickets				✅
SSL_get_options		✅		✅
SSL_get_peer_cert_chain	✅	✅	✅	✅
SSL_get_peer_finished			✅	❗ 11
SSL_get_peer_signature_type_nid	✅			✅
SSL_get_pending_cipher
SSL_get_privatekey	✅		✅	✅
SSL_get_psk_identity 15
SSL_get_psk_identity_hint 15
SSL_get_quiet_shutdown
SSL_get_rbio		✅	✅	✅
SSL_get_read_ahead
SSL_get_record_padding_callback_arg
SSL_get_recv_max_early_data
SSL_get_rfd
SSL_get_security_callback
SSL_get_security_level
SSL_get_selected_srtp_profile 16
SSL_get_server_random			✅	❗ 11
SSL_get_servername		✅	✅	✅
SSL_get_servername_type				✅
SSL_get_session		✅	✅	✅
SSL_get_shared_ciphers				❗ 11
SSL_get_shared_sigalgs
SSL_get_shutdown	✅	✅		✅
SSL_get_sigalgs
SSL_get_signature_type_nid
SSL_get_srp_N 8 10
SSL_get_srp_g 8 10
SSL_get_srp_userinfo 8 10				❗ 11
SSL_get_srp_username 8 10				❗ 11
SSL_get_srtp_profiles 16
SSL_get_ssl_method
SSL_get_state			✅	✅
SSL_get_verify_callback
SSL_get_verify_depth				✅
SSL_get_verify_mode				✅
SSL_get_verify_result	✅	✅	✅	✅
SSL_get_version	✅	✅	✅	✅
SSL_get_wbio		✅	✅	✅
SSL_get_wfd
SSL_group_to_name				✅
SSL_has_matching_session_id
SSL_has_pending				✅
SSL_in_before				✅
SSL_in_init		✅		✅
SSL_is_dtls
SSL_is_init_finished		✅	✅	✅
SSL_is_server				✅
SSL_key_update
SSL_load_client_CA_file		✅		❗ 11
SSL_load_client_CA_file_ex
SSL_new	✅	✅	✅	✅
SSL_new_session_ticket
SSL_peek			✅	❗ 11
SSL_peek_ex
SSL_pending	✅			✅
SSL_read	✅	✅	✅	✅
SSL_read_early_data		✅	✅	❗ 11
SSL_read_ex
SSL_renegotiate				❗ 11
SSL_renegotiate_abbreviated
SSL_renegotiate_pending			✅	✅
SSL_rstate_string
SSL_rstate_string_long
SSL_select_next_proto		✅	✅	✅
SSL_sendfile		✅		❗ 11
SSL_session_reused		✅	✅	✅
SSL_set0_CA_list
SSL_set0_rbio	✅			✅
SSL_set0_security_ex_data
SSL_set0_tmp_dh_pkey
SSL_set0_wbio	✅			✅
SSL_set1_host				✅
SSL_set1_param
SSL_set_SSL_CTX		✅	✅	✅
SSL_set_accept_state		✅	✅	✅
SSL_set_allow_early_data_cb
SSL_set_alpn_protos			✅	✅
SSL_set_async_callback
SSL_set_async_callback_arg
SSL_set_bio	✅	✅	✅	✅
SSL_set_block_padding
SSL_set_cert_cb
SSL_set_cipher_list				✅
SSL_set_ciphersuites
SSL_set_client_CA_list			✅	❗ 11
SSL_set_connect_state	✅	✅	✅	✅
SSL_set_ct_validation_callback 12
SSL_set_debug 4
SSL_set_default_passwd_cb
SSL_set_default_passwd_cb_userdata
SSL_set_default_read_buffer_len
SSL_set_ex_data	✅	✅	✅	✅
SSL_set_fd 7	✅	✅		✅
SSL_set_generate_session_id
SSL_set_hostflags
SSL_set_info_callback				✅
SSL_set_max_early_data		✅	✅	✅
SSL_set_msg_callback		✅	✅	✅
SSL_set_not_resumable_session_callback
SSL_set_num_tickets				✅
SSL_set_options		✅		✅
SSL_set_post_handshake_auth				❗ 11
SSL_set_psk_client_callback 15
SSL_set_psk_find_session_callback
SSL_set_psk_server_callback 15
SSL_set_psk_use_session_callback
SSL_set_purpose
SSL_set_quiet_shutdown		✅	✅	✅
SSL_set_read_ahead
SSL_set_record_padding_callback
SSL_set_record_padding_callback_arg
SSL_set_recv_max_early_data
SSL_set_rfd 7
SSL_set_security_callback
SSL_set_security_level				✅
SSL_set_session	✅	✅	✅	❗ 11
SSL_set_session_id_context				❗ 11
SSL_set_session_secret_cb
SSL_set_session_ticket_ext
SSL_set_session_ticket_ext_cb
SSL_set_shutdown		✅		✅
SSL_set_srp_server_param 8 10				❗ 11
SSL_set_srp_server_param_pw 8 10
SSL_set_ssl_method
SSL_set_tlsext_max_fragment_length
SSL_set_tlsext_use_srtp 16
SSL_set_tmp_dh_callback 8 17
SSL_set_trust
SSL_set_verify		✅	✅	✅
SSL_set_verify_depth		✅		✅
SSL_set_verify_result				✅
SSL_set_wfd 7
SSL_shutdown	✅	✅	✅	✅
SSL_srp_server_param_with_username 8 10
SSL_state_string				❗ 11
SSL_state_string_long				❗ 11
SSL_stateless
SSL_test_functions 18
SSL_trace 19
SSL_up_ref				✅
SSL_use_PrivateKey		✅		✅
SSL_use_PrivateKey_ASN1
SSL_use_PrivateKey_file				✅
SSL_use_RSAPrivateKey 8
SSL_use_RSAPrivateKey_ASN1 8
SSL_use_RSAPrivateKey_file 8
SSL_use_cert_and_key
SSL_use_certificate		✅		✅
SSL_use_certificate_ASN1
SSL_use_certificate_chain_file
SSL_use_certificate_file
SSL_use_psk_identity_hint 15
SSL_verify_client_post_handshake				❗ 11
SSL_version		✅		✅
SSL_waiting_for_async			✅	❗ 11
SSL_want				✅
SSL_write	✅	✅	✅	✅
SSL_write_early_data		✅	✅	❗ 11
SSL_write_ex
SSLv3_client_method 4 20
SSLv3_method 4 20
SSLv3_server_method 4 20
TLS_client_method	✅		✅	✅
TLS_method		✅		✅
TLS_server_method			✅	✅
TLSv1_1_client_method 4 21
TLSv1_1_method 4 21
TLSv1_1_server_method 4 21
TLSv1_2_client_method 4 22
TLSv1_2_method 4 22
TLSv1_2_server_method 4 22
TLSv1_client_method 4 23
TLSv1_method 4 23
TLSv1_server_method 4 23
d2i_SSL_SESSION		✅	✅	✅
i2d_SSL_SESSION		✅	✅	✅

Footnotes

1. combined requirements of curl 7.81.0-1ubuntu1.15 (ubuntu 22.04), and curl 8.5.0 (ubuntu 24.04) ↩

2. combined requirements of nginx 1.18.0-6ubuntu14.4 (ubuntu 22.04), and nginx 1.24.0 (ubuntu 24.04), and fedora nginx 1.26.1-1.fc40 ↩

3. haproxy 2.8.5-1ubuntu3.3 (ubuntu 24.04) ↩

4. deprecated in openssl 1.1.0 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹

5. DTLS 1.2-specific ↩ ↩² ↩³

6. DTLS 1.0-specific ↩ ↩² ↩³

7. specific to platforms with file descriptors ↩ ↩² ↩³ ↩⁴

8. deprecated in openssl 3.0 ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶ ↩²⁷ ↩²⁸ ↩²⁹

9. depends on C stdio FILE* ↩ ↩² ↩³

10. SRP-specific ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹

11. symbol exists, but just returns an error. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³ ↩¹⁴ ↩¹⁵ ↩¹⁶ ↩¹⁷ ↩¹⁸ ↩¹⁹ ↩²⁰ ↩²¹ ↩²² ↩²³ ↩²⁴ ↩²⁵ ↩²⁶ ↩²⁷ ↩²⁸ ↩²⁹ ↩³⁰ ↩³¹ ↩³² ↩³³ ↩³⁴ ↩³⁵ ↩³⁶ ↩³⁷ ↩³⁸ ↩³⁹ ↩⁴⁰ ↩⁴¹ ↩⁴² ↩⁴³ ↩⁴⁴ ↩⁴⁵ ↩⁴⁶ ↩⁴⁷ ↩⁴⁸ ↩⁴⁹ ↩⁵⁰ ↩⁵¹ ↩⁵² ↩⁵³ ↩⁵⁴ ↩⁵⁵ ↩⁵⁶ ↩⁵⁷ ↩⁵⁸ ↩⁵⁹ ↩⁶⁰

12. certificate transparency-specific (NYI in rustls) ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹

13. openssl ENGINE-specific ↩

14. next protocol negotiation (NPN) feature -- non-standard precursor to ALPN ↩ ↩² ↩³

15. pre-shared-key-specific ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸

16. SRTP-specific ↩ ↩² ↩³ ↩⁴

17. Diffie-Hellman-specific ↩ ↩²

18. access to openssl internals for unit testing ↩

19. protocol tracing API ↩

20. SSL 3.0-specific ↩ ↩² ↩³

21. TLS 1.1-specific ↩ ↩² ↩³

22. TLS 1.2-specific ↩ ↩² ↩³

23. TLS 1.0-specific ↩ ↩² ↩³