ParagonIE_Sodium_Compat::crypto_scalarmult_base( string $secretKey ): string

2591    public static function crypto_scalarmult_base(2592        #[\SensitiveParameter]2593        $secretKey2594    ) {2595        /* Type checks: */2596        ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);2597 2598        /* Input validation: */2599        if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {2600            throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');2601        }2602 2603        if (self::useNewSodiumAPI()) {2604            return sodium_crypto_scalarmult_base($secretKey);2605        }2606        if (self::use_fallback('crypto_scalarmult_base')) {2607            return (string) call_user_func('\\Sodium\\crypto_scalarmult_base', $secretKey);2608        }2609        if (ParagonIE_Sodium_Core_Util::hashEquals($secretKey, str_repeat("\0", self::CRYPTO_BOX_SECRETKEYBYTES))) {2610            throw new SodiumException('Zero secret key is not allowed');2611        }2612        if (PHP_INT_SIZE === 4) {2613            return ParagonIE_Sodium_Crypto32::scalarmult_base($secretKey);2614        }2615        return ParagonIE_Sodium_Crypto::scalarmult_base($secretKey);2616    }