ParagonIE_Sodium_Core_Ed25519::sign_open( string $message, string $pk ): string

190    public static function sign_open($message, $pk)191    {192        /** @var string $signature */193        $signature = self::substr($message, 0, 64);194 195        /** @var string $message */196        $message = self::substr($message, 64);197 198        if (self::verify_detached($signature, $message, $pk)) {199            return $message;200        }201        throw new SodiumException('Invalid signature');202    }