Calculate the client-side session keys.

# sodium_crypto_kx_client_session_keys

(PHP 7 >= 7.2.0, PHP 8)

sodium_crypto_kx_client_session_keys — Calculate the client-side session keys.

### Description

sodium_crypto_kx_client_session_keys(#[\SensitiveParameter] string `$client_key_pair`, string `$server_key`): array

Calculate the client-side session keys, using the X25519 + BLAKE2b key-exchange method.

### Parameters

`client_key_pair`
  A crypto_kx keypair, such as one generated by sodium_crypto_kx_keypair().
`server_key`
  A crypto_kx public key.

### Return Values

An array consisting of two strings. The first should be used for receiving data from the server. The second should be used for sending data to the server.

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