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<p dir="auto">During the standartization process of RFC8463, this message discussed ED25519 signing of hashes, rather than the whole message data <a href="https://www.ietf.org/mail-archive/web/dcrup/current/msg00501.html" rel="nofollow noreferrer noopener" target="_blank">https://www.ietf.org/mail-archive/web/dcrup/current/msg00501.html</a>, citing from the GnuTLS manual “Note that, not all algorithm support signing already hashed data. When signing with Ed25519, gnutls_privkey_sign_data() should be used.”</p>
<p dir="auto">The answer <a href="https://www.ietf.org/mail-archive/web/dcrup/current/msg00502.html" rel="nofollow noreferrer noopener" target="_blank">https://www.ietf.org/mail-archive/web/dcrup/current/msg00502.html</a> contains: “if the spec says there's a pure version that doesn't hash its input, the libraries would implement it”.</p>
<p dir="auto">Now the common aim is, that libraries implement what specifications say. I am not in a position to lead a fact based discussion on Ed25519 signing hashes, as I am not that competent in cryptography. Neither is it feasible to make postings to a mailing list, then (filter and) copy the answers here, and then back to the mailing list.</p>
<p dir="auto">If RFC8463 says to sign hashes with ED25519 and GnuTLS is not going to sign ED25519 hashes, please subscirbe either the DCRUP / <a href="https://www.ietf.org/mailman/listinfo/dcrup" rel="nofollow noreferrer noopener" target="_blank">https://www.ietf.org/mailman/listinfo/dcrup</a> or the IETF-DKIM / <a href="https://www.ietf.org/mailman/listinfo/ietf-dkim" rel="nofollow noreferrer noopener" target="_blank">https://www.ietf.org/mailman/listinfo/ietf-dkim</a> mailing lists and reach a consent.</p>
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