<?php

if (!is_callable('sodium_crypto_stream_xchacha20')) {

    /**

     * @see ParagonIE_Sodium_Compat::crypto_stream_xchacha20()

     * @param int $len

     * @param string $nonce

     * @param string $key

     * @return string

     * @throws SodiumException

     * @throws TypeError

     */

    function sodium_crypto_stream_xchacha20($len, $nonce, $key)

    {

        return ParagonIE_Sodium_Compat::crypto_stream_xchacha20($len, $nonce, $key, true);

    }

}

if (!is_callable('sodium_crypto_stream_xchacha20_keygen')) {

    /**

     * @see ParagonIE_Sodium_Compat::crypto_stream_xchacha20_keygen()

     * @return string

     * @throws Exception

     */

    function sodium_crypto_stream_xchacha20_keygen()

    {

        return ParagonIE_Sodium_Compat::crypto_stream_xchacha20_keygen();

    }

}

if (!is_callable('sodium_crypto_stream_xchacha20_xor')) {

    /**

     * @see ParagonIE_Sodium_Compat::crypto_stream_xchacha20_xor()

     * @param string $message

     * @param string $nonce

     * @param string $key

     * @return string

     * @throws SodiumException

     * @throws TypeError

     */

    function sodium_crypto_stream_xchacha20_xor($message, $nonce, $key)

    {

        return ParagonIE_Sodium_Compat::crypto_stream_xchacha20_xor($message, $nonce, $key, true);

    }

}