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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
<a href="https://gitlab.com/gnutls/gnutls/-/issues/1355#note_1373764559">commented</a>:
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<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">This probably can be implemented in two levels of interfaces: callback-based and one-time assignment. The former is to done by adding a new <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; margin-top: 0; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>gnutls_psk_key_flags</code> enum value, say <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>GNUTLS_PSK_KEY_IMPORT</code> to indicate that PSK is imported, and extending <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>gnutls_psk_set_client_credentials_function</code> and <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>gnutls_psk_set_server_credentials_function</code> with a new callback function that takes <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>context</code> and <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>flag</code>, both as a return parameter. TLS 1.3 handshake state machine calls this new callback and if the returned <code style='font-size: 0.875rem; color: #1f1e24; word-wrap: break-word; background-color: #ececef; border-radius: 4px; font-weight: inherit; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 2px 4px;'>flag</code> indicates that it's an importable PSK, calculates the IPSK as defined in the RFC.</p>
<p dir="auto" style="color: #333238; margin: 0 0 16px;" align="initial">This interface is, however, not so intuitive to use. Therefore, the latter interface is provided for handy, which provides the following functions:</p>
<div class="gl-relative markdown-code-block js-markdown-code">
<pre lang="c" class="code highlight js-syntax-highlight language-c" v-pre="true" style='display: block; font-size: 0.875rem; color: #333238; line-height: 1.6em; overflow-x: auto; border-radius: 4px; position: relative; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; word-break: break-all; word-wrap: break-word; background-color: #fbfafd; margin: 0 0 16px; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: 0.875rem; color: inherit; word-wrap: normal; word-break: keep-all; background-color: inherit; border-radius: 4px; white-space: pre; margin-top: 0; font-family: var(--default-mono-font, "Menlo"),"DejaVu Sans Mono","Liberation Mono","Consolas","Ubuntu Mono","Courier New","andale mono","lucida console",monospace; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="c" style="margin-top: 0;"><span class="kt" style="margin-top: 0;">int</span> <span class="nf">gnutls_psk_import_client_credentials</span><span class="p">(</span><span class="n">gnutls_psk_client_credentials_t</span> <span class="n">res</span><span class="p">,</span></span>
<span id="LC2" class="line" lang="c"> <span class="k" style="margin-top: 0;">const</span> <span class="n">gnutls_datum_t</span> <span class="o">*</span><span class="n">username</span><span class="p">,</span></span>
<span id="LC3" class="line" lang="c"> <span class="k" style="margin-top: 0;">const</span> <span class="n">gnutls_datum_t</span> <span class="o">*</span><span class="n">key</span><span class="p">,</span></span>
<span id="LC4" class="line" lang="c"> <span class="k" style="margin-top: 0;">const</span> <span class="n">gnutls_datum_t</span> <span class="o">*</span><span class="n">context</span><span class="p">);</span></span>
<span id="LC5" class="line" lang="c"></span>
<span id="LC6" class="line" lang="c"><span class="kt" style="margin-top: 0;">int</span> <span class="nf">gnutls_psk_import_server_credentials</span><span class="p">(</span><span class="n">gnutls_psk_server_credentials_t</span> <span class="n">res</span><span class="p">,</span></span>
<span id="LC7" class="line" lang="c"> <span class="k" style="margin-top: 0;">const</span> <span class="n">gnutls_datum_t</span> <span class="o">*</span><span class="n">username</span><span class="p">,</span></span>
<span id="LC8" class="line" lang="c"> <span class="k" style="margin-top: 0;">const</span> <span class="n">gnutls_datum_t</span> <span class="o">*</span><span class="n">key</span><span class="p">,</span></span>
<span id="LC9" class="line" lang="c"> <span class="k" style="margin-top: 0;">const</span> <span class="n">gnutls_datum_t</span> <span class="o">*</span><span class="n">context</span><span class="p">);</span></span></code></pre>
<copy-code></copy-code>
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<p dir="auto" style="color: #333238; margin: 0;" align="initial">This interface is less flexible than the callback-based interface, as the CONTEXT is assigned statically. The current server API also has an interface to read PSKs from a file, but I would rather not touch it.</p>
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