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<a href="https://gitlab.com/lumag">Dmitry Eremin-Solenikov</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/820#note_121230948">lib/nettle/int/drbg-aes.c</a>:
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<pre style="margin: 0;"> <span id="LC143" class="line" lang="c"> <span class="n" style="color: #333;">memset</span><span class="p">(</span><span class="n" style="color: #333;">seed</span><span class="p">,</span> <span class="mi" style="color: #099;">0</span><span class="p">,</span> <span class="n" style="color: #333;">DRBG_AES_SEED_SIZE</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC144" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC145" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC146" class="line" lang="c"> <span class="cm" style="color: #998; font-style: italic;">/* Throw the first block generated. FIPS 140-2 requirement (see </span></span>
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<pre style="margin: 0;">-<span id="LC147" class="line" lang="c"><span class="cm" style="color: #998; font-style: italic;"> * the continuous random number generator test in 4.9.2)</span></span>
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<pre style="margin: 0;">-<span id="LC148" 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="LC149" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</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;">prev_block_present</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="LC150" class="line" lang="c"> <span class="n" style="color: #333;">INCREMENT</span><span class="p">(</span><span class="k" style="font-weight: 600;">sizeof</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;">v</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;">v</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC151" class="line" lang="c"> <span class="n" style="color: #333;">aes256_encrypt</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333;">ctx</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">key</span><span class="p">,</span> <span class="n" style="color: #333;">AES_BLOCK_SIZE</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;">prev_block</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;">v</span><span class="p">);</span></span>
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<pre style="margin: 0;">-<span id="LC152" class="line" lang="c"></span>
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<pre style="margin: 0;">-<span id="LC153" class="line" lang="c"> <span class="n" style="color: #333;">ctx</span><span class="o" style="font-weight: 600;">-></span><span class="n" style="color: #333;">prev_block_present</span> <span class="o" style="font-weight: 600;">=</span> <span class="mi" style="color: #099;">1</span><span class="p">;</span></span>
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<pre style="margin: 0;">-<span id="LC154" class="line" lang="c"> <span class="p">}</span></span>
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<pre style="margin: 0;">-<span id="LC155" class="line" lang="c"></span>
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<p dir="auto">Judging from that part and from SP-800-90A it is not necessary.</p>
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