A question about the package "ccgarch"

Hello everyone:

I am a new user to the package "ccgarch". I have a question about one function "dcc.estimation" in the package. In this function , a subfunction "vector.garch" is used to calculate conditional variances. However, when I type: 
  

library(ccgarch)
vector.garch
    

the code of "vector.garch" is as follows:
function (dvar, a, A, B) 
{
    dvar <- dvar^2
    .Call("vector_garch", dvar, a, A, B)
}
<environment: namespace:ccgarch>

And I find the "vector_garch" in the source code zip, the code is as follows:
#computing vector GARCH volatilities: valid for CCC, ECCC, DCC, EDCC models
vector.garch <- function(dvar, a, A, B){
      dvar <- dvar^2           # dvar = eps
     .Call("vector_garch", dvar, a, A, B)
}

My question is : how can these lines of code be able to calculate conditional variances in the package? I feel confused.

Thank you very much for any help about my problem.
                                                                           ZHU Cai

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