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POLY: don't clamp polyonmial in build_polynom()

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Otherwise we might hit problems when using this as an
out-polynom in a arithmetic functions. The caller can clamp
it himself, if he needs so.
This commit is contained in:
hasufell 2014-04-15 22:50:11 +02:00 committed by malte
parent f8cac1553f
commit 0d179a0e7d
1 changed files with 9 additions and 3 deletions
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12
src/poly.c
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@ -81,7 +81,10 @@ void init_polynom_size(pb_poly *new_poly, mp_int *chara, size_t size)
* Initializes and builds a polynomial with the * Initializes and builds a polynomial with the
* coefficient values of c[] of size len within NTRU * coefficient values of c[] of size len within NTRU
* context ctx and returns a newly allocated polynomial * context ctx and returns a newly allocated polynomial
* pointer. * pointer which is not clamped.
*
* If you want to fill a polyonmial of length 11 with zeros,
* call build_polynom(NULL, 11, ctx).
* *
* @param c array of polynomial coefficients, can be NULL * @param c array of polynomial coefficients, can be NULL
* @param len size of the coefficient array, can be 0 * @param len size of the coefficient array, can be 0
@ -119,10 +122,13 @@ pb_poly *build_polynom(int const * const c,
if (sign == true) if (sign == true)
new_poly->terms[i].sign = 1; new_poly->terms[i].sign = 1;
} }
new_poly->used = len; } else { /* fill with zeros */
pb_clamp(new_poly); for (unsigned int i = 0; i < len; i++)
mp_set(&(new_poly->terms[i]), 0);
} }
new_poly->used = len;
return new_poly; return new_poly;
} }