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<p>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>

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<p dir="auto">GnuTLS implements the standardized version of EdDSA, which is the pure version as defined in <a href="https://tools.ietf.org/html/rfc8410" rel="nofollow noreferrer noopener" target="_blank">RFC8410</a>. The pure version can only hash data, and cannot sign an existing hash.</p>

<p dir="auto">The version which can sign arbitrary hashes is called pre-hashed-EdDSA and has not been standardized (at least not in the RFC above).</p>

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