ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_init_push( string $key ): array<int,

1241    public static function secretstream_xchacha20poly1305_init_push($key)1242    {1243        # randombytes_buf(out, crypto_secretstream_xchacha20poly1305_HEADERBYTES);1244        $out = random_bytes(24);1245 1246        # crypto_core_hchacha20(state->k, out, k, NULL);1247        $subkey = ParagonIE_Sodium_Core_HChaCha20::hChaCha20($out, $key);1248        $state = new ParagonIE_Sodium_Core_SecretStream_State(1249            $subkey,1250            ParagonIE_Sodium_Core_Util::substr($out, 16, 8) . str_repeat("\0", 4)1251        );1252 1253        # _crypto_secretstream_xchacha20poly1305_counter_reset(state);1254        $state->counterReset();1255 1256        # memcpy(STATE_INONCE(state), out + crypto_core_hchacha20_INPUTBYTES,1257        #        crypto_secretstream_xchacha20poly1305_INONCEBYTES);1258        # memset(state->_pad, 0, sizeof state->_pad);1259        return array(1260            $state->toString(),1261            $out1262        );1263    }