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POLY: implemented pb_normalize

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normalizes a polynom by defining a numerical range
for each factor of a polynom.
This commit is contained in:
Christoph Prüßner 2014-05-12 13:46:59 +02:00
parent 1412ba0d1a
commit 4030335661
2 changed files with 41 additions and 0 deletions
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34
src/poly.c
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@ -432,3 +432,37 @@ void draw_polynom(pb_poly * const poly)
}
printf("\n");
}
void pb_normalize(pb_poly *poly, int low_border, int high_border, ntru_context *ctx){
unsigned int p = ctx->p;
unsigned int N = ctx->N;
mp_int mp_p;
mp_int mp_low_border;
mp_int mp_high_border;
init_integer(&mp_low_border);
init_integer(&mp_high_border);
init_integer(&mp_p);
MP_SET_INT(&mp_p, p);
MP_SET_INT(&mp_low_border,(unsigned long)abs(low_border));
mp_neg(&mp_low_border,&mp_low_border);
MP_SET_INT(&mp_high_border,high_border);
unsigned int i;
for(i = 0; i < N; i++){
if(mp_cmp(&(poly->terms[i]),&mp_low_border) == MP_LT) {
mp_add(&(poly->terms[i]),&mp_p,&(poly->terms[i]));
} else if(mp_cmp(&(poly->terms[i]),&mp_high_border) == MP_GT) {
mp_sub(&(poly->terms[i]),&mp_p,&(poly->terms[i]));
}
}
}
void draw_mp_int(mp_int *digit) {
char buf[8192];
mp_toradix(digit, buf, 10);
printf("%s\n",buf);
}

7
src/poly.h
View File

@ -184,4 +184,11 @@ bool pb_inverse_poly_q(pb_poly *a,
void draw_polynom(pb_poly * const poly);
void pb_normalize(pb_poly*,
int,
int,
ntru_context*);
void draw_mp_int(mp_int*);
#endif /* NTRU_POLY_H */