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<a href="https://gitlab.com/dueno">Daiki Ueno</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/894#note_160899365">lib/prf.c</a>:
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<pre style="margin: 0;"> <span id="LC202" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC203" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC204" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;">/**</span></span>
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<td class="diff-line-num new new_line" data-linenumber="205" 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="LC205" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * gnutls_prf_early:</span></span>
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<td class="diff-line-num new new_line" data-linenumber="206" 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="LC206" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * @session: is a #gnutls_session_t type.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="207" 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="LC207" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * @label_size: length of the @label variable.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="208" 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="LC208" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * @label: label used in PRF computation, typically a short string.</span></span>
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<td class="diff-line-num new new_line" data-linenumber="209" 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="LC209" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * @context_size: length of the @extra variable.</span></span>
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<pre style="margin: 0;">+<span id="LC210" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * @context: optional extra data to seed the PRF with.</span></span>
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<pre style="margin: 0;">+<span id="LC211" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * @outsize: size of pre-allocated output buffer to hold the output.</span></span>
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<pre style="margin: 0;">+<span id="LC212" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * @out: pre-allocated buffer to hold the generated data.</span></span>
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<pre style="margin: 0;">+<span id="LC213" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC214" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * This function is similar to gnutls_prf_rfc5705(), but only works in</span></span>
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<pre style="margin: 0;">+<span id="LC215" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * TLS 1.3 or later to export early keying material.</span></span>
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<pre style="margin: 0;">+<span id="LC216" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> *</span></span>
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<pre style="margin: 0;">+<span id="LC217" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * Note that the keying material is only available after the</span></span>
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<p dir="auto">Certainly we can, but I am not sure if it's worth it, as it could only save one call of HKDF-Expand.</p>
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