sodium_crypto_box_publickey_from_secretkey

sodium_crypto_box_publickey_from_secretkey

Calculate the public key from a secret key

string **sodium_crypto_box_publickey_from_secretkey** string $secret_key

Given a secret key, calculate the corresponding public key.

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

secret_keyX25519 secret key

X25519 public key.