sodium_crypto_box_publickey_from_secretkey

Calculate the public key from a secret key

Description

string sodium_crypto_box_publickey_from_secretkey(#[\SensitiveParameter]string $secret_key)

Given a secret key, calculate the corresponding public key.

This only works with the type of keys intended for use with crypto_box (which uses Elliptic Curve Diffie-Hellman over the Montgomery curve, Curve25519; abbreviated as X25519), not crypto_sign (which uses Edwards Digital Signature Algorithm over the Edwards Curve with the corresponding paramaters; abbreviated Ed25519).

Parameters

secret_key: X25519 secret key

Return Values

X25519 public key.