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<a href="https://gitlab.com/smuellerDD">Stephan Mueller</a>
commented on a
discussion on <a href="https://gitlab.com/gnutls/gnutls/-/merge_requests/1404#note_552438883">lib/accelerated/afalg.c</a>:
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<pre style="margin: 0;"> <span id="LC505" class="line" lang="c"> <span class="k" style="font-weight: 600;">goto</span> <span class="n" style="color: #333;">end</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC506" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC507" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC515" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* The kernel may set the AAD, avoid modification of auth */</span></span>
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<pre style="margin: 0;">-<span id="LC516" class="line" lang="c"> <span class="n" style="color: #333;">iov</span><span class="p">[</span><span class="mi" style="color: #099;">0</span><span class="p">].</span><span class="n" style="color: #333;">iov_base</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">authtmp</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC517" class="line" lang="c"></span>
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<pre style="margin: 0;"> <span id="LC508" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Set CT buffer to be filled by kernel */</span></span>
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<pre style="margin: 0;">-<span id="LC519" class="line" lang="c"> <span class="n" style="color: #333;">iov</span><span class="p">[</span><span class="mi" style="color: #099;"><span class="idiff left right deletion">1</span></span><span class="p">].</span><span class="n" style="color: #333;">iov_base</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">encr</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC520" class="line" lang="c"> <span class="n" style="color: #333;">iov</span><span class="p">[</span><span class="mi" style="color: #099;"><span class="idiff left deletion">1</span></span><span class="p">].</span><span class="n" style="color: #333;">iov_len</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;"><span class="idiff deletion">plain</span>_size</span> <span class="o" style="font-weight: 600;"><span class="idiff deletion">+</span></span><span class="idiff deletion"> </span><span class="n" style="color: #333;"><span class="idiff right deletion">tag</span>_size</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC509" class="line" lang="c"> <span class="n" style="color: #333;">iov</span><span class="p">[</span><span class="mi" style="color: #099;"><span class="idiff left right addition">0</span></span><span class="p">].</span><span class="n" style="color: #333;">iov_base</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333;">encr</span><span class="p">;</span></span>
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<pre style="margin: 0;">+<span id="LC510" class="line" lang="c"> <span class="n" style="color: #333;">iov</span><span class="p">[</span><span class="mi" style="color: #099;"><span class="idiff left addition">0</span></span><span class="p">].</span><span class="n" style="color: #333;">iov_len</span> <span class="o" style="font-weight: 600;">=</span> <span class="p"><span class="idiff addition">(</span></span><span class="n" style="color: #333;"><span class="idiff addition">encr</span>_size</span> <span class="o" style="font-weight: 600;"><span class="idiff addition">></span></span><span class="idiff addition"> </span><span class="n" style="color: #333;"><span class="idiff addition">outbuflen</span></span><span class="p"><span class="idiff addition">)</span></span><span class="idiff addition"> </span><span class="o" style="font-weight: 600;"><span class="idiff addition">?</span></span><span class="idiff addition"> </span><span class="n" style="color: #333;"><span class="idiff addition">outbuflen</span></span><span class="idiff addition"> </span><span class="o" style="font-weight: 600;"><span class="idiff addition">:</span></span><span class="idiff addition"> </span><span class="n" style="color: #333;"><span class="idiff right addition">encr</span>_size</span><span class="p">;</span></span>
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<pre style="margin: 0;"> <span id="LC511" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC522" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">kcapi_aead_stream_op</span><span class="p">(</span><span class="n" style="color: #333;">ctx</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">handle</span><span class="p">,</span> <span class="n" style="color: #333;">iov</span><span class="p">,</span> <span class="mi" style="color: #099;"><span class="idiff left right deletion">2</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC512" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">kcapi_aead_stream_op</span><span class="p">(</span><span class="n" style="color: #333;">ctx</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">handle</span><span class="p">,</span> <span class="n" style="color: #333;">iov</span><span class="p">,</span> <span class="mi" style="color: #099;"><span class="idiff left right addition">1</span></span><span class="p">)</span> <span class="o" style="font-weight: 600;"><</span> <span class="mi" style="color: #099;">0</span><span class="p">)</span> <span class="p">{</span></span>
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<p dir="auto">Apologies if I am not using gitlab right :-)</p>
<p dir="auto">But, I see that there is one IOVEC with the encryption buffer used for the _op operation. If I see that right, the encr buffer should be as large to hold the ciphertext || tag data. What I am trying to say is that the kernel, however returns the AAD first, followed by the ciphertext || tag. So, If I would understand it right, the encr buffer is filled with AAD concatenated with parts of the CT and potentially the tag depending on the size of the AAD.</p>
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