PHP 7 >= 7.2.0, PHP 8
sodium_crypto_box_publickey_from_secretkey - Calculate the public key from a secret key

sodium_crypto_box_publickey_from_secretkey( string$secret_key ): string

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).



X25519 secret key

Return Values

X25519 public key.

Function sodium_crypto_box_publickey_from_secretkey:

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