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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/1925#note_2311275629">lib/nettle/pk.c</a>:
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850
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<td class="new_line diff-line-num" data-linenumber="845" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
845
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC845" class="line" lang="c"><span class="p">{</span></span>
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<td class="old_line diff-line-num old" data-linenumber="851" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
851
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<td class="new_line diff-line-num old" data-linenumber="846" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #fac5cd; border-right-style: solid; padding: inherit;" align="right" bgcolor="#f9d7dc">
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<td class="line_content old" style="padding: inherit;" bgcolor="#fbe9eb"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>-<span id="LC851" class="line" lang="c"> <span class="n" style="color: #333333;">mpz_t</span> <span class="n" style="color: #333333;">p</span><span class="p">;</span></span>
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<td class="old_line diff-line-num" data-linenumber="852" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
852
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<td class="new_line diff-line-num" data-linenumber="846" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #ececef; border-right-style: solid; padding: inherit;" align="right" bgcolor="#fbfafd">
846
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<td class="line_content" style="padding: inherit;"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'> <span id="LC846" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">int</span> <span class="n" style="color: #333333;">ret</span><span class="p">;</span></span>
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<td class="old_line diff-line-num new" data-linenumber="853" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="new_line diff-line-num new" data-linenumber="847" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
847
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC847" class="line" lang="c"> <span class="k" style="font-weight: 600;">enum</span> <span class="n" style="color: #333333;">lc_kyber_type</span> <span class="n" style="color: #333333;">type</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="848" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
848
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC848" class="line" lang="c"> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333333;">lc_kyber_sk</span> <span class="n" style="color: #333333;">sk</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="849" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
849
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC849" class="line" lang="c"> <span class="k" style="font-weight: 600;">struct</span> <span class="n" style="color: #333333;">lc_kyber_pk</span> <span class="n" style="color: #333333;">pk</span><span class="p">;</span></span>
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<td class="old_line diff-line-num new" data-linenumber="853" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
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<td class="new_line diff-line-num new" data-linenumber="850" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
850
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC850" class="line" lang="c"> <span class="n" style="color: #333333;">gnutls_datum_t</span> <span class="n" style="color: #333333;">tmp_raw_priv</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">{</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="mi" style="color: #009999;">0</span> <span class="p">};</span></span>
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<td class="new_line diff-line-num new" data-linenumber="851" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
851
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC851" class="line" lang="c"> <span class="n" style="color: #333333;">gnutls_datum_t</span> <span class="n" style="color: #333333;">tmp_raw_pub</span> <span class="o" style="font-weight: 600;">=</span> <span class="p">{</span> <span class="nb" style="color: #0086b3;">NULL</span><span class="p">,</span> <span class="mi" style="color: #009999;">0</span> <span class="p">};</span></span>
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<td class="new_line diff-line-num new" data-linenumber="852" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
852
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC852" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">uint8_t</span> <span class="o" style="font-weight: 600;">*</span><span class="n" style="color: #333333;">ptr</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="853" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
853
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC853" class="line" lang="c"> <span class="kt" style="color: #445588; font-weight: 600;">size_t</span> <span class="n" style="color: #333333;">len</span><span class="p">;</span></span>
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<td class="new_line diff-line-num new" data-linenumber="854" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
854
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC854" class="line" lang="c"></span>
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<td class="new_line diff-line-num new" data-linenumber="855" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
855
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC855" class="line" lang="c"> <span class="n" style="color: #333333;">type</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">ml_kem_pk_to_lc_kyber_type</span><span class="p">(</span><span class="n" style="color: #333333;">algo</span><span class="p">);</span></span>
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<td class="new_line diff-line-num new" data-linenumber="856" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
856
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC856" class="line" lang="c"> <span class="k" style="font-weight: 600;">if</span> <span class="p">(</span><span class="n" style="color: #333333;">type</span> <span class="o" style="font-weight: 600;">==</span> <span class="n" style="color: #333333;">LC_KYBER_UNKNOWN</span><span class="p">)</span></span>
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<td class="new_line diff-line-num new" data-linenumber="857" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
857
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC857" class="line" lang="c"> <span class="k" style="font-weight: 600;">return</span> <span class="n" style="color: #333333;">gnutls_assert_val</span><span class="p">(</span><span class="n" style="color: #333333;">GNUTLS_E_UNKNOWN_PK_ALGORITHM</span><span class="p">);</span></span>
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<td class="new_line diff-line-num new" data-linenumber="858" style="width: 35px; color: rgba(5,5,6,.24); border-right-width: 1px; border-right-color: #c7f0d2; border-right-style: solid; padding: inherit;" align="right" bgcolor="#ddfbe6">
858
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC858" class="line" lang="c"></span>
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859
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<td class="line_content new" style="padding: inherit;" bgcolor="#ecfdf0"><pre style='display: block; font-size: 14px; color: #3a383f; position: relative; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: break-all; word-wrap: break-word; background-color: inherit; border-radius: 2px; margin: 0; padding: 0; border: inherit solid #dcdcde;'>+<span id="LC859" class="line" lang="c"> <span class="n" style="color: #333333;">ret</span> <span class="o" style="font-weight: 600;">=</span> <span class="n" style="color: #333333;">lc_kyber_keypair</span><span class="p">(</span><span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333333;">pk</span><span class="p">,</span> <span class="o" style="font-weight: 600;">&</span><span class="n" style="color: #333333;">sk</span><span class="p">,</span> <span class="n" style="color: #333333;">lc_seeded_rng</span><span class="p">,</span> <span class="n" style="color: #333333;">type</span><span class="p">);</span></span>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">The lc_seeded_rng provides a fully seeded RNG. My remarks were about the following considerations: If you use the already provided lc_seeded_rng, your overall implementation now uses two distinct RNG implementations with two distinct seeding operations and possibly different seed sources.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">All I was suggesting a means to make sure that your GnuTLS RNG where you manage the state/seed sources according to your rules is used throughout the leancrypto code as well.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Thus, from a crypto point of view, there should be no issue to use lc_seeded_rng out of the box. But from a formal point of view (and perhaps the FIPS 140 view point), you may only want to have one RNG and one seed source assessment instead of two.</p>
<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">That said, your boiler plate RNG implementation is correct, and good and covers the suggestion above. But it does NOT cover one important aspect: <a href="https://github.com/smuellerDD/leancrypto/blob/master/ml-kem/src/kyber_kem_api_c.c#L43" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">https://github.com/smuellerDD/leancrypto/blob/master/ml-kem/src/kyber_kem_api_c.c#L43</a> shows that internal to the leancrypto library the lc_seeded_rng is used for ML-KEM enc. As this RNG is used to generate the shared secret key, it is a key RNG that is in scope for, say, FIPS as well as the consideration above. Initially this RNG instance was controllable by the caller, but my FIPS colleagues made me hide it. Thus, to cover the discussion above for this very call, you need to replace the lc_seeded_rng callback using the lc_rng_set_seeded. lc_seeded_rng is a pointer and is changed with the lc_rng_set_seeded call to your implementation.</p>
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