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function is not described

ParagonIE_Sodium_Compat::crypto_scalarmult() public WP 1.0

Calculate the shared secret between your secret key and your recipient's public key.

Algorithm: X25519 (ECDH over Curve25519)

{} It's a method of the class: ParagonIE_Sodium_Compat{}

No Hooks.

Return

String.

Usage

$result = ParagonIE_Sodium_Compat::crypto_scalarmult( $secretKey, $publicKey );
$secretKey(string) (required)
-
$publicKey(string) (required)
-

Code of ParagonIE_Sodium_Compat::crypto_scalarmult() WP 5.8.2

public static function crypto_scalarmult($secretKey, $publicKey)
{
    /* Type checks: */
    ParagonIE_Sodium_Core_Util::declareScalarType($secretKey, 'string', 1);
    ParagonIE_Sodium_Core_Util::declareScalarType($publicKey, 'string', 2);

    /* Input validation: */
    if (ParagonIE_Sodium_Core_Util::strlen($secretKey) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
        throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
    }
    if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
        throw new SodiumException('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
    }

    if (self::useNewSodiumAPI()) {
        return sodium_crypto_scalarmult($secretKey, $publicKey);
    }
    if (self::use_fallback('crypto_scalarmult')) {
        return (string) call_user_func('\\Sodium\\crypto_scalarmult', $secretKey, $publicKey);
    }

    /* Output validation: Forbid all-zero keys */
    if (ParagonIE_Sodium_Core_Util::hashEquals($secretKey, str_repeat("\0", self::CRYPTO_BOX_SECRETKEYBYTES))) {
        throw new SodiumException('Zero secret key is not allowed');
    }
    if (ParagonIE_Sodium_Core_Util::hashEquals($publicKey, str_repeat("\0", self::CRYPTO_BOX_PUBLICKEYBYTES))) {
        throw new SodiumException('Zero public key is not allowed');
    }
    if (PHP_INT_SIZE === 4) {
        return ParagonIE_Sodium_Crypto32::scalarmult($secretKey, $publicKey);
    }
    return ParagonIE_Sodium_Crypto::scalarmult($secretKey, $publicKey);
}