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<a href="https://gitlab.com/dueno">Daiki Ueno</a> created an issue: <a href="https://gitlab.com/gnutls/gnutls/-/issues/1665">#1665</a>
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<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">After a <a href="https://mailarchive.ietf.org/arch/msg/spasm/vaAKtzW3BVHN8cm_JbwIaX-ypms/" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">discussion</a> in the IETF LAMPS working group, the current consensus is to only support seed-only private keys for ML-DSA and ML-KEM, though GnuTLS currently only support expanded private keys. We may, at least optionally, want to support the seed-only format for private keys.</p>
<p dir="auto" style="color: #3a383f; margin: 0 0 1rem;" align="initial">At the library API level, there is an existing mechanism used for provable key generation for RSA:</p>
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<code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; 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; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;'>gnutls_privkey_generate2</code> with <code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; 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; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;'>GNUTLS_KEYGEN_SEED</code> parameter to generate a private key from/through a seed</li>
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<code style='font-size: 90%; color: #18171d; word-wrap: break-word; border-radius: .25rem; background-color: #ececef; 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; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;'>gnutls_privkey_get_seed</code> to retrieve the seed to generate a private key</li>
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<p dir="auto" style="color: #3a383f; margin: 0;" align="initial">As for the file format, when writing a private key, we probably should use the seed-only format by default specified in <a href="https://www.ietf.org/archive/id/draft-ietf-lamps-dilithium-certificates-07.html#name-private-key-format" rel="nofollow noreferrer noopener" target="_blank" style="margin-top: 0;">section 6</a> of draft-ietf-lamps-dilithium-certificates-07. When reading, on the other hand, we may also support a expanded-only format which I would propose as signified by the presence of a "publicKey" field in a OneAsymmetricKey structure (with the "version" field set to 1), so it is mutually exclusive with the seed-only format.</p>
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