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<a href="https://gitlab.com/nmav">Nikos Mavrogiannopoulos</a>
commented on a discussion
on <a href="https://gitlab.com/gnutls/gnutls/merge_requests/820#note_121050933">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">To my understanding, the test is still mentioned in <a href="https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.140-2.pdf" rel="nofollow noreferrer noopener" target="_blank">FIPS140-2 document, section 4.9.2</a>. However the <a href="https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Module-Validation-Program/documents/fips140-2/FIPS1402IG.pdf" rel="nofollow noreferrer noopener" target="_blank">newest implementation guide</a> in section 9.8 claims:</p>
<blockquote dir="auto" style="color: #7f8fa4; border-left-width: 3px; border-left-color: #eaeaea; border-left-style: solid; margin: 0; padding: 0 0 0 15px;">
<p>In view of the considerations stated above, the requirement to pass the CRNGT is interpreted as follows.
The SP-800-90A-compliant DRBGs are not required to perform the test as described in AS.09.42 and AS.09.43</p>
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