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[/] [rsa_512/] [trunk/] [src/] [constant_gen.c] - Blame information for rev 3

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Line No. Rev Author Line
1 3 jcastillo
#include <stdio.h>
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#include <gmp.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#define uint16 unsigned short int
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#define uint32 unsigned int
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#define uint64 unsigned long long int
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#define WORD_SIZE 32
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uint32 getMpzSize(mpz_t n)
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{
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   return (mpz_size(n)*2);
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}
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uint16 getlimb(mpz_t n, int i)
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{
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   uint32 aux=mpz_getlimbn(n,i/2);
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   if(i%2 == 0)
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     return (uint16) (aux&0xffff);
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   return (uint16) (aux>>16);
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}
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int main()
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{
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    int i;
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    mpz_t m,x,y,r,r_aux, n_cons, zero, recons;
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    char *template;
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    mpz_init_set_str(m,"8de7066f67be16fcacd05d319b6729cd85fe698c07cec504776146eb7a041d9e3cacbf0fcd86441981c0083eed1f8f1b18393f0b186e47ce1b7b4981417b491",16); //mpz_init_set_str(m,"c3217fff",16);
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    mpz_init(r);
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    mpz_init(r_aux);
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    mpz_init(n_cons);
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    mpz_init_set_ui(zero,0);
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    //Calculo de la constante para salir de la representacion de montgomery
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    mpz_ui_pow_ui(r,2,16*(getMpzSize(m)+1));
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    mpz_mul(r_aux,r,r);
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    mpz_mod(r_aux,r_aux,m);
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    mpz_sub(n_cons,zero,m);
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    mpz_invert(n_cons,n_cons,r);
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    printf    ("n_c <= %x;\n\n", (uint32)mpz_getlimbn(n_cons,0)&0xffff);
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    gmp_printf("r_c <= %Zx\n\n", r_aux);
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    return 0;
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}

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