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<a name="Upgrading-from-previous-versions"></a>
<div class="header">
<p>
Next: <a href="Support.html#Support" accesskey="n" rel="next">Support</a>, Previous: <a href="Internal-architecture-of-GnuTLS.html#Internal-architecture-of-GnuTLS" accesskey="p" rel="previous">Internal architecture of GnuTLS</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Upgrading-from-previous-versions-1"></a>
<h2 class="appendix">Appendix A Upgrading from previous versions</h2>
<a name="index-upgrading"></a>
<p>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.
</p>
<a name="Upgrading-to-2_002e12_002ex-from-previous-versions"></a>
<h3 class="heading">Upgrading to 2.12.x from previous versions</h3>
<p>GnuTLS 2.12.x is binary compatible with previous versions but changes the
semantics of <code>gnutls_transport_set_lowat</code>, which might cause breakage
in applications that relied on its default value be 1. Two fixes
are proposed:
</p><ul>
<li> Quick fix. Explicitly call <code>gnutls_transport_set_lowat (session, 1);</code>
after <a href="Core-TLS-API.html#gnutls_005finit">gnutls_init</a>.
</li><li> Long term fix. Because later versions of gnutls abolish the functionality
of using the system call <code>select</code> to check for gnutls pending data, the
function <a href="Core-TLS-API.html#gnutls_005frecord_005fcheck_005fpending">gnutls_record_check_pending</a> has to be used to achieve the same
functionality as described in <a href="Asynchronous-operation.html#Asynchronous-operation">Asynchronous operation</a>.
</li></ul>
<a name="Upgrading-to-3_002e0_002ex-from-2_002e12_002ex"></a>
<h3 class="heading">Upgrading to 3.0.x from 2.12.x</h3>
<p>GnuTLS 3.0.x is source compatible with previous versions except for the functions
listed below.
</p>
<table>
<thead><tr><th width="30%">Old function</th><th width="60%">Replacement</th></tr></thead>
<tr><td width="30%"><code>gnutls_transport_set_lowat</code></td><td width="60%">To replace its functionality the function <a href="Core-TLS-API.html#gnutls_005frecord_005fcheck_005fpending">gnutls_record_check_pending</a> has to be used,
as described in <a href="Asynchronous-operation.html#Asynchronous-operation">Asynchronous operation</a></td></tr>
<tr><td width="30%"><code>gnutls_session_get_server_random</code>,
<code>gnutls_session_get_client_random</code></td><td width="60%">They are replaced by the safer function <a href="Core-TLS-API.html#gnutls_005fsession_005fget_005frandom">gnutls_session_get_random</a></td></tr>
<tr><td width="30%"><code>gnutls_session_get_master_secret</code></td><td width="60%">Replaced by the keying material exporters discussed in <a href="Keying-Material-Exporters.html#Keying-Material-Exporters">Keying Material Exporters</a></td></tr>
<tr><td width="30%"><code>gnutls_transport_set_global_errno</code></td><td width="60%">Replaced by using the system’s errno fascility or <a href="Core-TLS-API.html#gnutls_005ftransport_005fset_005ferrno">gnutls_transport_set_errno</a>.</td></tr>
<tr><td width="30%"><code>gnutls_x509_privkey_verify_data</code></td><td width="60%">Replaced by <a href="Abstract-key-API.html#gnutls_005fpubkey_005fverify_005fdata">gnutls_pubkey_verify_data</a>.</td></tr>
<tr><td width="30%"><code>gnutls_certificate_verify_peers</code></td><td width="60%">Replaced by <a href="Core-TLS-API.html#gnutls_005fcertificate_005fverify_005fpeers2">gnutls_certificate_verify_peers2</a>.</td></tr>
<tr><td width="30%"><code>gnutls_psk_netconf_derive_key</code></td><td width="60%">Removed. The key derivation function was never standardized.</td></tr>
<tr><td width="30%"><code>gnutls_session_set_finished_function</code></td><td width="60%">Removed.</td></tr>
<tr><td width="30%"><code>gnutls_ext_register</code></td><td width="60%">Removed. Extension registration API is now internal to allow easier changes in the API.</td></tr>
<tr><td width="30%"><code>gnutls_certificate_get_x509_crls</code>, <code>gnutls_certificate_get_x509_cas</code></td><td width="60%">Removed to allow updating the internal structures. Replaced by <a href="Core-TLS-API.html#gnutls_005fcertificate_005fget_005fissuer">gnutls_certificate_get_issuer</a>.</td></tr>
<tr><td width="30%"><code>gnutls_certificate_get_openpgp_keyring</code></td><td width="60%">Removed.</td></tr>
<tr><td width="30%"><code>gnutls_ia_*</code></td><td width="60%">Removed. The inner application extensions were completely removed (they failed to be standardized).</td></tr>
</table>
<a name="Upgrading-to-3_002e1_002ex-from-3_002e0_002ex"></a>
<h3 class="heading">Upgrading to 3.1.x from 3.0.x</h3>
<p>GnuTLS 3.1.x is source and binary compatible with GnuTLS 3.0.x releases. Few
functions have been deprecated and are listed below.
</p>
<table>
<thead><tr><th width="30%">Old function</th><th width="60%">Replacement</th></tr></thead>
<tr><td width="30%"><code>gnutls_pubkey_verify_hash</code></td><td width="60%">The function <a href="Abstract-key-API.html#gnutls_005fpubkey_005fverify_005fhash2">gnutls_pubkey_verify_hash2</a> is provided and
is functionally equivalent and safer to use.</td></tr>
<tr><td width="30%"><code>gnutls_pubkey_verify_data</code></td><td width="60%">The function <a href="Abstract-key-API.html#gnutls_005fpubkey_005fverify_005fdata2">gnutls_pubkey_verify_data2</a> is provided and
is functionally equivalent and safer to use.</td></tr>
</table>
<hr>
<div class="header">
<p>
Next: <a href="Support.html#Support" accesskey="n" rel="next">Support</a>, Previous: <a href="Internal-architecture-of-GnuTLS.html#Internal-architecture-of-GnuTLS" accesskey="p" rel="previous">Internal architecture of GnuTLS</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Function-and-Data-Index.html#Function-and-Data-Index" title="Index" rel="index">Index</a>]</p>
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