Function custom_symcrypt_provider 

pub fn custom_symcrypt_provider(
    provided_cipher_suites: Option<Vec<SupportedCipherSuite>>,
    provided_kx_group: Option<Vec<&'static dyn SupportedKxGroup>>,
) -> CryptoProvider

custom_symcrypt_provider provides a way to set up an custom config using a symcrypt crypto backend.

provided_cipher_suites takes in an optional Vec<> of SupportedCipherSuites. The supplied arguments for provided_cipher_suite will be used when when negotiating the TLS cipher suite; and should be placed in preference order, where the first element has highest priority. If None or an empty Vec<> is provided the DEFAULT_CIPHER_SUITES will be used instead.

provided_kx_group takes in an optional Vec<> of SupportedKxGroup The supplied arguments for provided_kx_group will be used when when negotiating the TLS key exchange; and should be placed in preference order, where the first element has highest priority. If None or an empty Vec<> is provided the default will be used instead.

This call cannot fail.

Sample usage:

use rustls::{ClientConfig, RootCertStore};
use rustls_symcrypt::{custom_symcrypt_provider, TLS13_AES_128_GCM_SHA256, SECP256R1};
use std::sync::Arc;
use webpki_roots;

let mut root_store = RootCertStore {
    roots: webpki_roots::TLS_SERVER_ROOTS.iter().cloned().collect(),
};

// Set custom config of cipher suites that have been imported from rustls_symcrypt.
let cipher_suites = vec![TLS13_AES_128_GCM_SHA256];
let kx_group = vec![SECP256R1];

let mut config =
    ClientConfig::builder_with_provider(Arc::new(custom_symcrypt_provider(
        Some(cipher_suites), Some(kx_group))))
            .with_safe_default_protocol_versions()
            .unwrap()
            .with_root_certificates(root_store)
            .with_no_client_auth();
    // Rest of the connection setup