How to use mpi_read_binary() function?

Question

I'm trying to do an RSA public key computation using the Polarssl RSA library. I get the source code of the library from here. I'm having issues while trying to use a function name mpi_read_binay(), defined in here. I'm not familiar with mpi structure. I tried like this,

#define MAX_MPI_IN_BYTE 256
// RSA public keypair
unsigned char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
unsigned char *RSA_E =  "10001";

typedef struct _key_rsa{
     unsigned char *N[MAX_MPI_IN_BYTE];
     unsigned char *E[MAX_MPI_IN_BYTE];
}key_rsa;


static int public_key_computation(unsigned char *inout, key_rsa key){
   int j,ret = 1;
   rsa_context rsa;    
   rsa_init(&rsa,RSA_PKCS_V15, 0); 

   printf("public_key_computation: key.N contains\n %s\n", *key.N);

   mpi_read_binary(&rsa.N,*key.N,sizeof(key.N)); 
   printf("Inside doAll: rsa.N contains %s\n", rsa.N);

   return ret ;   
}


void main(){

   int result,j;
   result = -1;
   unsigned char mes[MAX_MOD] = {1,2,3,4,5,0}; 
   unsigned char in[MAX_MPI_IN_BYTE];
   memcpy(in,mes,MAX_MPI_IN_BYTE);
   key_rsa test={RSA_N,RSA_E};
   result = public_key_computation(in,test);
}

output :

public_key_computation: key.N contains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egmentation fault (core dumped)

So,the problem is whenever I try to call that mpi_read_binary() to set rsa.N value, It just crashes. Any help ? Thank you