ParagonIE_Sodium_Crypto::secretstream_xchacha20poly1305_init_pull( string $key, string $header ): string

1271    public static function secretstream_xchacha20poly1305_init_pull($key, $header)1272    {1273        # crypto_core_hchacha20(state->k, in, k, NULL);1274        $subkey = ParagonIE_Sodium_Core_HChaCha20::hChaCha20(1275            ParagonIE_Sodium_Core_Util::substr($header, 0, 16),1276            $key1277        );1278        $state = new ParagonIE_Sodium_Core_SecretStream_State(1279            $subkey,1280            ParagonIE_Sodium_Core_Util::substr($header, 16)1281        );1282        $state->counterReset();1283        # memcpy(STATE_INONCE(state), in + crypto_core_hchacha20_INPUTBYTES,1284        #     crypto_secretstream_xchacha20poly1305_INONCEBYTES);1285        # memset(state->_pad, 0, sizeof state->_pad);1286        # return 0;1287        return $state->toString();1288    }