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<p dir="auto">The abstract of <a href="https://tools.ietf.org/html/rfc8463#appendix-A.2" rel="nofollow noreferrer noopener" target="_blank">RFC8463</a> speaks about Ed25519-SHA256. Calling gnutls_pk_to_sign(GNUTLS_PK_EDDSA_ED25519, gnutls_digest_algorithm_t hash) I have to pass hash=GNUTLS_DIG_SHA512, otherwise gnutls_pk_to_sign returns GNUTLS_SIGN_UNKNOWN.</p>
<p dir="auto">I want to use SHA256 with ED25519, which seems to me impossible.</p>
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