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[/] [mod_sim_exp/] [trunk/] [sw/] [ModMult/] [src/] [ModMult.c] - Blame information for rev 67

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Line No. Rev Author Line
1 29 JonasDC
/*
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 ============================================================================
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 Name        : ModExp.c
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 Author      :
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 Version     :
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 Copyright   : Your copyright notice
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 Description : Hello World in C, Ansi-style
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 ============================================================================
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <gmp.h>
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int main(void) {
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        unsigned int base_width;
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        mpz_t x, m, r, R, R2;
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        gmp_randstate_t state;
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        gmp_randinit_mt(state);
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        mpz_init(x);
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        mpz_init(m);
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        mpz_init(r);
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        mpz_init(R);
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        mpz_init(R2);
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        printf("-- input generator program\n");
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        printf("--  generates test values for multiplier testbench\n");
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        while (1){
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                //read in base_width
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                scanf("%d", &base_width);
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                if (base_width == 0) break;
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                //generate modulus (must be uneven)
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                mpz_urandomb(m, state, base_width);
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                mpz_setbit(m, 0); //uneven
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                //generate x
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                mpz_urandomb(x, state, base_width);
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                //calculate R
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                mpz_set_ui(R, 2);
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                mpz_powm_ui(R, R, base_width, m); //R = 2^n mod m
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                //calculate R2
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                mpz_set_ui(R2, 2);
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                mpz_powm(R2, R, R2, m); //R2 = Rē mod m = 2^2n mod m
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                //calculate result
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                mpz_mul(r, x, R);
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                mpz_powm_ui(r, r, 1, m);
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                printf("-- x, y, m, result\n");
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                gmp_printf("%Zx\n", x);
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                gmp_printf("%Zx\n", R2);
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                gmp_printf("%Zx\n", m);
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                gmp_printf("%Zx\n", r);
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        }
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        mpz_clear(x);
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        mpz_clear(R2);
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        mpz_clear(m);
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        mpz_clear(r);
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        mpz_clear(R);
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        gmp_randclear(state);
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        return EXIT_SUCCESS;
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}

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