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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/1233#note_323523284">lib/nettle/cipher.c</a>:
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<pre style="margin: 0;"> <span id="LC326" class="line" lang="c"> <span class="n" style="color: #333;">length</span><span class="p">,</span> <span class="n" style="color: #333;">dst</span><span class="p">,</span> <span class="n" style="color: #333;">src</span><span class="p">);</span></span>
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<pre style="margin: 0;"> <span id="LC327" class="line" lang="c"><span class="p">}</span></span>
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<pre style="margin: 0;"> <span id="LC328" class="line" lang="c"></span>
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<pre style="margin: 0;">+<span id="LC329" class="line" lang="c"><span class="k" style="font-weight: 600;">static</span> <span class="kt" style="color: #458; font-weight: 600;">void</span></span>
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<pre style="margin: 0;">+<span id="LC330" class="line" lang="c"><span class="nf" style="color: #900; font-weight: 600;">_xts_aes128_set_encrypt_key</span><span class="p">(</span><span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333;">xts_aes128_key</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">xts_key</span><span class="p">,</span></span>
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<pre style="margin: 0;">+<span id="LC331" class="line" lang="c"> <span class="k" style="font-weight: 600;">const</span> <span class="kt" style="color: #458; font-weight: 600;">uint8_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333;">key</span><span class="p">)</span></span>
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<pre style="margin: 0;">+<span id="LC332" class="line" lang="c"><span class="p">{</span></span>
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<pre style="margin: 0;">+<span id="LC333" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333;">safe_memcmp</span><span class="p">(</span><span class="n" style="color: #333;">key</span><span class="p">,</span> <span class="n" style="color: #333;">key</span> <span class="o" style="font-weight: 600;">+</span> <span class="n" style="color: #333;">AES128_KEY_SIZE</span><span class="p">,</span> <span class="n" style="color: #333;">AES128_KEY_SIZE</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>
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<pre style="margin: 0;">+<span id="LC334" class="line" lang="c"> <span class="n" style="color: #333;">_gnutls_switch_lib_state</span><span class="p">(</span><span class="n" style="color: #333;">LIB_STATE_ERROR</span><span class="p">);</span></span>
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<pre style="margin: 0;">+<span id="LC335" class="line" lang="c"> <span class="k" style="font-weight: 600;">else</span></span>
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<pre style="margin: 0;">+<span id="LC336" class="line" lang="c"> <span class="n" style="color: #333;">xts_aes128_set_encrypt_key</span><span class="p">(</span><span class="n" style="color: #333;">xts_key</span><span class="p">,</span> <span class="n" style="color: #333;">key</span><span class="p">);</span></span>
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<p dir="auto">Good catch, should be safer now.</p>
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