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sodium_crypto_box_publickey_from_secretkeyCalculate 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.

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