(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_sign_seed_keypair — Deterministically derive the key pair from a single key
$seed): stringClamps the seed to form a secret key, derives the public key, and returns the two as a keypair.
The *_seed_keypair functions are ideal for generating a keypair from a
password and salt. Use the result as a seed to generate the desired keys.
seedSome cryptographic input. Must be 32 bytes.
Keypair (secret key and public key)