sodium_crypto_aead_chacha20poly1305_encrypt

A flip/flop unit test to give you a sample:<?phpuse PHPUnit\Framework\TestCase;class SodiumTest extends TestCase{    public function testSodium()    {        // or 32 cryptographically secure bytes        // store the key securely with other secrets in your app        $key = sodium_crypto_aead_xchacha20poly1305_ietf_keygen();        // 8-bytes nonce should be stored along with the ciphertext (will be needed for decryption)        // It is not sensitive, you may just prepend it before the ciphertext.        $nonce = random_bytes(SODIUM_CRYPTO_AEAD_CHACHA20POLY1305_NPUBBYTES);        $flip = 'Hello, world!';        $ciphertext = sodium_crypto_aead_chacha20poly1305_encrypt($flip, $nonce, $nonce, $key);        $flop = sodium_crypto_aead_chacha20poly1305_decrypt($ciphertext, $nonce, $nonce, $key);        $this->assertEquals($flip, $flop);    }}?>Side note: the nonce is used twice in this test, but you can use a username, an identifier or whatever you like in `$additional_data`