Random number generation

[Gabriele Martino]

Hi,
I need to generate random numbers of 512 bits.
I use the following code :

mpz_t p;
gmp_randstate_t rstate;
mpz_init2(p,512);
gmp_randinit(rstate,GMP_RAND_ALG_LC, 32);
mpz_urandomb(p, rstate, 512); 

The numbers are generated but the problem is that if I run several times this code it produces the SAME sequence of random numbers. 
How can I solve this problem? 
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