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Appendix A Upgrading from previous versions

The GnuTLS library typically maintains binary and source code compatibility across versions. The releases that have the major version increased break binary compatibility but source compatibility is provided. This section lists exceptional cases where changes to existing code are required due to library changes.

Upgrading to 2.12.x from previous versions

GnuTLS 2.12.x is binary compatible with previous versions but changes the semantics of gnutls_transport_set_lowat, which might cause breakage in applications that relied on its default value be 1. Two fixes are proposed:

Upgrading to 3.0.x from 2.12.x

GnuTLS 3.0.x is source compatible with previous versions except for the functions listed below.

Old functionReplacement
gnutls_transport_set_lowatTo replace its functionality the function gnutls_record_check_pending has to be used, as described in Asynchronous operation
gnutls_session_get_server_random, gnutls_session_get_client_randomThey are replaced by the safer function gnutls_session_get_random
gnutls_session_get_master_secretReplaced by the keying material exporters discussed in Deriving keys for other applications/protocols
gnutls_transport_set_global_errnoReplaced by using the system’s errno facility or gnutls_transport_set_errno.
gnutls_x509_privkey_verify_dataReplaced by gnutls_pubkey_verify_data2.
gnutls_certificate_verify_peersReplaced by gnutls_certificate_verify_peers2.
gnutls_psk_netconf_derive_keyRemoved. The key derivation function was never standardized.
gnutls_ext_registerRemoved. Extension registration API is now internal to allow easier changes in the API.
gnutls_certificate_get_x509_crls, gnutls_certificate_get_x509_casRemoved to allow updating the internal structures. Replaced by gnutls_certificate_get_issuer.
gnutls_ia_Removed. The inner application extensions were completely removed (they failed to be standardized).

Upgrading to 3.1.x from 3.0.x

GnuTLS 3.1.x is source and binary compatible with GnuTLS 3.0.x releases. Few functions have been deprecated and are listed below.

Old functionReplacement
gnutls_pubkey_verify_hashThe function gnutls_pubkey_verify_hash2 is provided and is functionally equivalent and safer to use.
gnutls_pubkey_verify_dataThe function gnutls_pubkey_verify_data2 is provided and is functionally equivalent and safer to use.

Upgrading to 3.2.x from 3.1.x

GnuTLS 3.2.x is source and binary compatible with GnuTLS 3.1.x releases. Few functions have been deprecated and are listed below.

Old functionReplacement
gnutls_privkey_sign_raw_dataThe function gnutls_privkey_sign_hash is equivalent when the flag GNUTLS_PRIVKEY_SIGN_FLAG_TLS1_RSA is specified.

Upgrading to 3.3.x from 3.2.x

GnuTLS 3.3.x is source and binary compatible with GnuTLS 3.2.x releases; however there few changes in semantics which are listed below.

Old functionReplacement
gnutls_global_initNo longer required. The library is initialized using a constructor.
gnutls_global_deinitNo longer required. The library is deinitialized using a destructor.

Upgrading to 3.4.x from 3.3.x

GnuTLS 3.4.x is source compatible with GnuTLS 3.3.x releases; however, several deprecated functions were removed, and are listed below.

Old functionReplacement
Priority string "NORMAL" has been modifiedThe following string emulates the 3.3.x behavior "NORMAL:+VERS-SSL3.0:+ARCFOUR-128:+DHE-DSS:+SIGN-DSA-SHA512:+SIGN-DSA-SHA256:+SIGN-DSA-SHA1"
gnutls_certificate_client_set_retrieve_function, gnutls_certificate_server_set_retrieve_functiongnutls_certificate_set_retrieve_function
gnutls_certificate_set_rsa_export_params, gnutls_rsa_export_get_modulus_bits, gnutls_rsa_export_get_pubkey, gnutls_rsa_params_cpy, gnutls_rsa_params_deinit, gnutls_rsa_params_export_pkcs1, gnutls_rsa_params_export_raw, gnutls_rsa_params_generate2, gnutls_rsa_params_import_pkcs1, gnutls_rsa_params_import_raw, gnutls_rsa_params_initNo replacement; the library does not support the RSA-EXPORT ciphersuites.
gnutls_x509_crt_get_verify_algorithm,No replacement; a similar function is gnutls_x509_crt_get_signature_algorithm.
gnutls_pubkey_get_verify_algorithm,No replacement; a similar function is gnutls_pubkey_get_preferred_hash_algorithm.
gnutls_certificate_type_set_priority, gnutls_cipher_set_priority, gnutls_compression_set_priority, gnutls_kx_set_priority, gnutls_mac_set_priority, gnutls_protocol_set_prioritygnutls_priority_set_direct.
gnutls_sign_callback_get, gnutls_sign_callback_setgnutls_privkey_import_ext3
gnutls_privkey_sign_raw_datagnutls_privkey_sign_hash with the flag GNUTLS_PRIVKEY_SIGN_FLAG_TLS1_RSA

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