wp-includes/sodium_compat/src/Crypto.php:425X25519 key exchange followed by XSalsa20Poly1305 symmetric encryption
$plaintextstring$noncestring$keypairstringstring public static function box($plaintext, $nonce, $keypair) { $c = self::secretbox( $plaintext, $nonce, self::box_beforenm( self::box_secretkey($keypair), self::box_publickey($keypair) ) ); return $c; }Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/sodium_compat/src/Crypto.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.