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<p class="details" style="font-style: italic; color: #777777;">
<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
started a new discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/775#note_109394561">doc/cha-gtls-app.texi</a>:
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<pre style="margin: 0;"> <span id="LC916" class="line" lang="plaintext">return early, allowing the server to send data earlier.</span>
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<pre style="margin: 0;"> <span id="LC917" class="line" lang="plaintext"></span>
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<td class="diff-line-num new new_line" data-linenumber="918" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC918" class="line" lang="plaintext">Under TLS 1.3, when the server and client share a @acronym{PSK}, the</span>
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<td class="diff-line-num new new_line" data-linenumber="919" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC919" class="line" lang="plaintext">client side can start transmitting application data during handshake.</span>
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<td class="diff-line-num new new_line" data-linenumber="920" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC920" class="line" lang="plaintext">This is called zero round-trip time (0-RTT) mode, and the application</span>
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<td class="diff-line-num new new_line" data-linenumber="921" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC921" class="line" lang="plaintext">data sent in this mode is called early data.</span>
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<td class="diff-line-num new new_line" data-linenumber="922" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC922" class="line" lang="plaintext"></span>
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<td class="diff-line-num new new_line" data-linenumber="923" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC923" class="line" lang="plaintext">Note, however, that early data has weaker security properties than</span>
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<pre style="margin: 0;">+<span id="LC924" class="line" lang="plaintext">normal application data sent after handshake, such as lack of forward</span>
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<pre style="margin: 0;">+<span id="LC925" class="line" lang="plaintext">secrecy, no guarantees of non-replay between connections. Thus it is</span>
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<pre style="margin: 0;">+<span id="LC926" class="line" lang="plaintext">disabled on the server side by default. To enable it, set</span>
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<td class="diff-line-num new new_line" data-linenumber="927" style="width: 35px; color: rgba(0,0,0,0.3); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: 0 5px;" align="right" bgcolor="#ddfbe6">
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<pre style="margin: 0;">+<span id="LC927" class="line" lang="plaintext">@acronym{GNUTLS_ENABLE_EARLY_DATA} on @funcref{gnutls_init}. Then the</span>
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<pre style="margin: 0;">+<span id="LC928" class="line" lang="plaintext">client can send early data with @funcref{gnutls_record_send_early_data}</span>
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<pre style="margin: 0;">+<span id="LC929" class="line" lang="plaintext">and the server can receive it with</span>
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<pre style="margin: 0;">+<span id="LC930" class="line" lang="plaintext">@funcref{gnutls_record_recv_early_data}.</span>
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<pre style="margin: 0;">+<span id="LC931" class="line" lang="plaintext"></span>
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<p dir="auto">Two questions that arise after reading it, is what happens if the server does not read that data? and when should a server call the <code>gnutls_record_recv_early_data</code>?</p>
<p dir="auto">That is, is the server expected to call this function during the handshake or after it, or it can be both?</p>
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