(PHP 7 >= 7.2.0)
sodium_crypto_scalarmult — Compute a shared secret given a user's secret key and another user's public key
sodium_crypto_scalarmult ( string $n , string $p ) : string
This function is currently not documented; only its argument list is available.
n
p
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https://www.php.net/manual/en/function.sodium-crypto-scalarmult.php