RAND: changed the function declaration to fit the the given needs better.
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Malte
malte
parent
4df4a37f9a
commit
cb69ea8689
153
src/rand.c
153
src/rand.c
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@ -38,11 +38,9 @@
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*/
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static mp_digit read_int_dev_random(void);
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static mp_digit read_int_dev_urandom(void);
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static mp_digit make_small_int(mp_digit random_int, int* sign);
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static mp_int *make_big_int(mp_int *upper_bound, mp_int *lower_bound,
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mp_digit randim_int);
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int entropy_source);
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static int check_polynom(pb_poly *polynom);
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/**
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@ -118,11 +116,11 @@ static mp_digit make_small_int(mp_digit random_int, int* sign)
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*
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* @param upper_bound the maximal upper border of the resulting mp_int [out]
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* @param lower_bound the minimal lower border of the resulting mp_int [out]
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* @param randim_int TODO
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* entropy_source random_int TODO
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* @return a mp_int with the random number
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*/
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static mp_int *make_big_int(mp_int *upper_bound, mp_int *lower_bound,
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mp_digit randim_int)
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int entropy_source)
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{
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mp_int result;
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init_integer(&result);
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@ -145,154 +143,59 @@ static mp_int *make_big_int(mp_int *upper_bound, mp_int *lower_bound,
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static int check_polynom(pb_poly *polynom)
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{
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int result = -1;
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//TODO
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return result;
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}
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///**
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// * Makes a big integer from the borders of BIG_RAND_MAX
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// * and BIG_RAND_MIN out of a randomly chosen integer.
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// *
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// * @param random_int a randomly chosen mp_digit [out]
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// * @param sign a integer to store the sign (1==positiv) [out]
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// * @return random big integer from the borders of BIG_RAND_MAX and BIG_RAND_MIN
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// */
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//static mp_digit make_big_int(mp_digit random_int, int* sign)
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//{
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// random_int = random_int % abs(BIG_RAND_MAX - BIG_RAND_MIN);
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//
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// if (random_int < BIG_RAND_MAX) {
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// *sign = 1;
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// } else if (random_int > BIG_RAND_MAX) {
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// *sign = 0;
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// random_int -= BIG_RAND_MAX;
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// } else if (random_int == BIG_RAND_MAX) {
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// random_int = abs(BIG_RAND_MIN);
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// *sign = 0;
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// } else {
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// NTRU_ABORT("Error while parsing big random Integer.\n");
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// }
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//
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// return random_int;
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//}
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/**
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* Gets a random polynomial with coefficients
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* from the set {-1 ,0 ,1} using /dev/random.
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* from the set {-1 ,0 ,1} using the given entropy source
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*
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* @param ctx the NTRU context [out]
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* @param length the amount of coefficients
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* @param entropy_source the source of entropy you want
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* @return newly allocated polynomial, must be freed with delete_polynom()
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*/
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pb_poly *ntru_get_rnd_poly_small(ntru_context *ctx)
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pb_poly *ntru_get_poly_small(int length, int entropy_source)
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{
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mp_int chara;
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init_integer(&chara);
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mp_digit c;
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pb_poly *poly = malloc(sizeof(pb_poly));
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init_polynom_size(poly, &chara, ctx->N);
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init_polynom_size(poly, &chara, length);
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mp_clear(&chara);
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for (unsigned int i = 0; i < ctx->N; i++) {
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for (unsigned int i = 0; i < length; i++) {
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int sign;
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mp_digit c = read_int_dev_random();
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if (entropy_source == GET_INT_FROM_RRAND) {
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c = read_int_dev_random();
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} else if (entropy_source == GET_INT_FROM_URAND) {
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c = read_int_dev_urandom();
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} else {
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NTRU_ABORT("No suitable entropy source selectetd.\n");
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}
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c = make_small_int(c, &sign);
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mp_set(&(poly->terms[i]), c);
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if (sign == 1)
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poly->terms[i].sign = 1;
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}
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poly->used = ctx->N;
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pb_clamp(poly);
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poly->used = length;
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return poly;
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}
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/**
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* Gets a random polynomial with coefficients
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* from the set {-1 ,0 ,1} using /dev/urandom.
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* from the the borders of lower_bound to upper_bound using the given entropy source
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*
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* @param ctx the NTRU context [out]
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* @param length the amount of coefficients
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* @param entropy_source the source of entropy you want
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* @return newly allocated polynomial, must be freed with delete_polynom()
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*/
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pb_poly *ntru_get_urnd_poly_small(ntru_context *ctx)
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pb_poly *ntru_get_poly_big(int length, int entropy_source, mp_int *upper_bound,
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mp_int *lower_bound)
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{
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mp_int chara;
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init_integer(&chara);
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pb_poly *poly = malloc(sizeof(pb_poly));
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init_polynom_size(poly, &chara, ctx->N);
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mp_clear(&chara);
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for (unsigned int i = 0; i < ctx->N; i++) {
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int sign;
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mp_digit c = read_int_dev_urandom();
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c = make_small_int(c, &sign);
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mp_set(&(poly->terms[i]), c);
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if (sign == 1)
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poly->terms[i].sign = 1;
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}
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poly->used = ctx->N;
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pb_clamp(poly);
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return poly;
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}
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/**
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* Gets a random polynomial with coefficients
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* from the borders of BIG_RAND_MAX and
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* BIG_RAND_MIN using /dev/random.
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*
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* @param ctx the NTRU context [out]
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* @return newly allocated polynomial, must be freed with delete_polynom()
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*/
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pb_poly *ntru_get_rnd_poly_big(ntru_context *ctx)
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{
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mp_int chara;
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init_integer(&chara);
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pb_poly *poly = malloc(sizeof(pb_poly));
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init_polynom_size(poly, &chara, ctx->N);
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mp_clear(&chara);
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for (unsigned int i = 0; i < ctx->N; i++) {
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int sign;
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mp_digit c = read_int_dev_random();
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c = make_big_int(c, &sign);
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mp_set(&(poly->terms[i]), c);
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if (sign == 1)
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poly->terms[i].sign = 1;
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}
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poly->used = ctx->N;
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pb_clamp(poly);
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return poly;
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}
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/**
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* Gets a random polynomial with coefficients
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* from the borders of BIG_RAND_MAX and
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* BIG_RAND_MIN using /dev/urandom.
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*
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* @param ctx the NTRU context [out]
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* @return newly allocated polynomial, must be freed with delete_polynom()
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*/
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pb_poly *ntru_get_urnd_poly_big(ntru_context *ctx)
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{
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mp_int chara;
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init_integer(&chara);
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pb_poly *poly = malloc(sizeof(pb_poly));
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init_polynom_size(poly, &chara, ctx->N);
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mp_clear(&chara);
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for (unsigned int i = 0; i < ctx->N; i++) {
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int sign;
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mp_digit c = read_int_dev_urandom();
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c = make_big_int(c, &sign);
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mp_set(&(poly->terms[i]), c);
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if (sign == 1)
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poly->terms[i].sign = 1;
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}
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poly->used = ctx->N;
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pb_clamp(poly);
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return poly;
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//TODO
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}
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17
src/rand.h
17
src/rand.h
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@ -26,9 +26,18 @@
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#include <tompoly.h>
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pb_poly *ntru_get_urnd_poly_small(ntru_context *ctx);
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pb_poly *ntru_get_rnd_poly_small(ntru_context *ctx);
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pb_poly *ntru_get_urnd_poly_big(ntru_context *ctx);
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pb_poly *ntru_get_rnd_poly_big(ntru_context *ctx);
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/**
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* Use the /dev/urandom device as entropy source.
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*/
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#define GET_INT_FROM_URAND 2
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/**
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* Use the /dev/random device as entropy source.
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*/
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#define GET_INT_FROM_RRAND 3
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pb_poly *ntru_get_poly_small(int length, int entropy_source);
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pb_poly *ntru_get_poly_big(int length, int entropy_source, mp_int *upper_bound,
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mp_int *lower_bound);
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#endif /* NTRU_RAND_H */
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