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Summery Summery
Perform a key exchange, between a designated client and a server.
Syntax Syntax
Description Description
Typically, you would designate one machine to be the client and the other to be the server. The first two keys are what you’d expect for scalarmult() below, but the latter two public keys don’t swap places.
| ALICE | BOB | Client | Server | |
|---|---|---|---|---|
| shared = crypto_kx( | shared = crypto_kx( | |||
| alice_sk, | bob_sk, | <- contextual | ||
| bob_pk, | alice_pk, | <- contextual | ||
| alice_pk, | alice_pk, | <—– static | ||
| bob_pk | bob_pk | <—– static | ||
| ) | ) |
They are used along with the scalarmult product to generate a 256-bit BLAKE2b hash unique to the client and server keys.
Parameters Parameters
- $my_secret
-
(Required)
- $their_public
-
(Required)
- $client_public
-
(Required)
- $server_public
-
(Required)
Return Return
(string)
Source Source
File: wp-includes/sodium_compat/src/Compat.php
public static function crypto_kx($my_secret, $their_public, $client_public, $server_public)
{
/* Type checks: */
ParagonIE_Sodium_Core_Util::declareScalarType($my_secret, 'string', 1);
ParagonIE_Sodium_Core_Util::declareScalarType($their_public, 'string', 2);
ParagonIE_Sodium_Core_Util::declareScalarType($client_public, 'string', 3);
ParagonIE_Sodium_Core_Util::declareScalarType($server_public, 'string', 4);
/* Input validation: */
if (ParagonIE_Sodium_Core_Util::strlen($my_secret) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
throw new SodiumException('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
}
if (ParagonIE_Sodium_Core_Util::strlen($their_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
throw new SodiumException('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
}
if (ParagonIE_Sodium_Core_Util::strlen($client_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
throw new SodiumException('Argument 3 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
}
if (ParagonIE_Sodium_Core_Util::strlen($server_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
throw new SodiumException('Argument 4 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
}
if (self::useNewSodiumAPI()) {
if (is_callable('sodium_crypto_kx')) {
return (string) sodium_crypto_kx(
$my_secret,
$their_public,
$client_public,
$server_public
);
}
}
if (self::use_fallback('crypto_kx')) {
return (string) call_user_func(
'\\Sodium\\crypto_kx',
$my_secret,
$their_public,
$client_public,
$server_public
);
}
if (PHP_INT_SIZE === 4) {
return ParagonIE_Sodium_Crypto32::keyExchange(
$my_secret,
$their_public,
$client_public,
$server_public
);
}
return ParagonIE_Sodium_Crypto::keyExchange(
$my_secret,
$their_public,
$client_public,
$server_public
);
}