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<a href="https://gitlab.com/hughsie">Richard Hughes</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1719">#1719</a>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Hi all,</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I'm building PQC into libjcat, using GnuTLS. I'm loading a ML-DSA87 PKCS#7 certificate (and private key) and then signing some data using <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; margin-top: 0; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>gnutls_pkcs7_sign()</code>. This works wonderfully, until I add <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>GNUTLS_PKCS7_INCLUDE_TIME</code> which causes the sign process to abort with <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>GNUTLS_E_INVALID_REQUEST</code>.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">The backtrace explains a little what's happening:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; 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: #fbfafd; margin: 0 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; border-radius: .25rem; background-color: inherit; white-space: pre; margin-top: 0; 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; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">#1 0x00007ffff784c0ad in gnutls_hash_fast (algorithm=GNUTLS_DIG_UNKNOWN, ptext=0x41fe68 <payload_str>, ptext_len=14, digest=digest@entry=0x7fffffffcdc0) at ../../lib/crypto-api.c:968</span>
<span id="LC2" class="line" lang="plaintext">#2 0x00007ffff78eb8b9 in write_attributes (root=0x7ffff79ba1c3 "signerInfos.?LAST.signedAttrs", c2=0x461740, data=0x7fffffffd010, me=0x7ffff7a74eb0 <hash_algorithms+1456>, other_attrs=<optimized out>, flags=2) at ../../../lib/x509/pkcs7.c:2273</span>
<span id="LC3" class="line" lang="plaintext">#3 gnutls_pkcs7_sign (pkcs7=0x452d50, signer=0x45dfe0, signer_key=0x458ed0, data=0x7fffffffd010, signed_attrs=<optimized out>, unsigned_attrs=<optimized out>, dig=GNUTLS_DIG_SHAKE_256, flags=2) at ../../../lib/x509/pkcs7.c:2452</span></code></pre>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">So, we're calling <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; margin-top: 0; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>gnutls_pkcs7_sign(dig: gnutls_digest_algorithm_t=GNUTLS_DIG_SHAKE_256)</code>, <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>write_attributes(me: mac_entry_st)</code> which when calls <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>gnutls_hash_fast(MAC_TO_DIG(me->id))</code> -- <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>MAC_TO_DIG()</code> being an alias to <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>_gnutls_mac_to_dig()</code>.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">Looking at the source code for that, I see:</p>
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<pre class="code highlight js-syntax-highlight language-plaintext" v-pre="true" style='display: block; font-size: 14px; color: #3a383f; line-height: 1.6em; overflow-x: auto; border-radius: .25rem; 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: #fbfafd; margin: 0 0 1rem; padding: 12px; border: 1px solid #dcdcde;'><code style='font-size: inherit; color: inherit; word-wrap: normal; word-break: keep-all; border-radius: .25rem; background-color: inherit; white-space: pre; margin-top: 0; 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; overflow-wrap: normal; padding: unset;'><span id="LC1" class="line" lang="plaintext" style="margin-top: 0;">inline static gnutls_digest_algorithm_t</span>
<span id="LC2" class="line" lang="plaintext">_gnutls_mac_to_dig(gnutls_mac_algorithm_t mac)</span>
<span id="LC3" class="line" lang="plaintext">{</span>
<span id="LC4" class="line" lang="plaintext"> if (unlikely(mac >= GNUTLS_MAC_AEAD))</span>
<span id="LC5" class="line" lang="plaintext"> return GNUTLS_DIG_UNKNOWN;</span>
<span id="LC6" class="line" lang="plaintext"> return (gnutls_digest_algorithm_t)mac;</span>
<span id="LC7" class="line" lang="plaintext">}</span></code></pre>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">...and sure enough, <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; margin-top: 0; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>GNUTLS_MAC_SHAKE_256</code> is indeed larger than <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>GNUTLS_MAC_AEAD</code> as defined in <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>gnutls_mac_algorithm_t</code> from <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>lib/includes/gnutls/gnutls.h.in</code></p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">I'm happy to write a merge request to fix this, but I'm not sure what the correct fix would be. Moving <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; margin-top: 0; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>GNUTLS_MAC_SHAKE_256</code> to be a lower number than <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>GNUTLS_MAC_AEAD</code> would work -- i.e. just after <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>GNUTLS_MAC_STREEBOG_512</code> -- but that's probably an API break.</p>
<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">I personally think adding the two constants to <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; margin-top: 0; font-weight: inherit; white-space: break-spaces; word-break: break-all; 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; overflow-wrap: break-word; padding: 0.125rem 0.25rem;'>_gnutls_mac_to_dig()</code> would be best. Thanks!</p>
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