(PHP 7 >= 7.2.0, PHP 8)
sodium_crypto_box_seed_keypair — Deterministically derive the key pair from a single key
sodium_crypto_box_seed_keypair(#[\SensitiveParameter] string $seed): string
Clamps 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.
X25519 Keypair (secret key and public key).
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https://www.php.net/manual/en/function.sodium-crypto-box-seed-keypair.php