/usr/lib/swipl/library/ext/ssl/crypto.pl
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 ed25519_seed_keypair(+Seed, -KeyPair) is det
Deterministically derive an Ed25519 key pair from Seed, 32 arbitrary bytes. Seed can be chosen at random using crypto_n_random_bytes/2 or derived from input keying material using crypto_data_hkdf/4.

KeyPair is a hexadecimal atom denoting the key pair in PKCS#8 v2 format (RFC 5958, RFC 8410), the format also used by openssl genpkey -algorithm ed25519. It contains the private key and must be kept absolutely secret. It can be used for signing with ed25519_sign/4, and its public key is obtained with ed25519_keypair_public_key/2.