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pqc
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POLY: small cleanup 

* rm printf stuff
* rename goto-statements
* improve inline doc
* rm unused variables
This commit is contained in:
hasufell 2014-04-29 19:59:59 +02:00
parent 5115b97c51
commit 942f90a0ef
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GPG Key ID: 220CD1C5BDEED020
1 changed files with 9 additions and 18 deletions
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27
src/poly.c
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@ -369,7 +369,7 @@ bool pb_inverse_poly_q(pb_poly * const a,
}
if (get_degree(f) == 0)
goto OUT_OF_LOOP;
goto OUT_OF_LOOP_Q;
if (get_degree(f) < get_degree(g)) {
pb_exch(f, g);
@ -380,7 +380,7 @@ bool pb_inverse_poly_q(pb_poly * const a,
pb_xor(b, c, b, ctx->N);
}
OUT_OF_LOOP:
OUT_OF_LOOP_Q:
k = k % ctx->N;
/* Fq(x) = x^(N-k) * b(x) */
@ -424,14 +424,11 @@ bool pb_inverse_poly_p(pb_poly *a,
int k = 0,
j = 0;
pb_poly *a_tmp, *b, *c, *f, *g;
mp_int mp_modulus, mp_minus;
mp_int mp_modulus;
/* general initialization of temp variables */
init_integer(&mp_modulus);
init_integer(&mp_minus);
MP_SET_INT(&mp_modulus, (unsigned long)(ctx->p));
MP_SET_INT(&mp_minus, 1);
mp_neg(&mp_minus, &mp_minus);
b = build_polynom(NULL, ctx->N + 1, ctx);
MP_SET(&(b->terms[0]), 1);
c = build_polynom(NULL, ctx->N + 1, ctx);
@ -454,7 +451,6 @@ bool pb_inverse_poly_p(pb_poly *a,
while (1) {
while (mp_cmp_d(&(f->terms[0]), 0) == MP_EQ) {
printf("blah\n");
for (unsigned int i = 1; i <= ctx->N; i++) {
/* f(x) = f(x) / x */
MP_COPY(&(f->terms[i]), &(f->terms[i - 1]));
@ -467,9 +463,10 @@ bool pb_inverse_poly_p(pb_poly *a,
}
if (get_degree(f) == 0)
goto OUT_OF_LOOP2;
goto OUT_OF_LOOP_P;
if (get_degree(f) < get_degree(g)) {
/* exchange f and g and exchange b and c */
pb_exch(f, g);
pb_exch(b, c);
}
@ -485,36 +482,30 @@ bool pb_inverse_poly_p(pb_poly *a,
c_tmp = build_polynom(NULL, ctx->N + 1, ctx);
PB_COPY(c, c_tmp);
/* u = ((f[0] mod p) * (g[0] inverse mod p) mod p) */
printf("u before: "); draw_polynom(u);
MP_COPY(&(f->terms[0]), &mp_tmp); /* don't change f[0] */
/* u = f[0] * g[0]^(-1) mod p
* = (f[0] mod p) * (g[0] inverse mod p) mod p */
MP_COPY(&(f->terms[0]), &mp_tmp); /* don't change f[0] */
MP_INVMOD(&(g->terms[0]), &mp_modulus, &(u->terms[0]));
MP_MOD(&mp_tmp, &mp_modulus, &mp_tmp);
MP_MUL(&(u->terms[0]), &mp_tmp, &(u->terms[0]));
MP_MOD(&(u->terms[0]), &mp_modulus, &(u->terms[0]));
/* f = f - u * g mod p */
printf("f before: "); draw_polynom(f);
PB_MUL(g_tmp, u, g_tmp);
PB_SUB(f, g_tmp, f);
PB_MOD(f, &mp_modulus, f, ctx->N + 1);
/* b = b - u * c mod p */
printf("b before: "); draw_polynom(b);
PB_MUL(c_tmp, u, c_tmp);
PB_SUB(b, c_tmp, b);
PB_MOD(b, &mp_modulus, b, ctx->N + 1);
printf("u after: "); draw_polynom(u);
printf("f after: "); draw_polynom(f);
printf("g after: "); draw_polynom(g);
printf("b after: "); draw_polynom(b);
mp_clear(&mp_tmp);
delete_polynom_multi(u, c_tmp, g_tmp, NULL);
}
}
OUT_OF_LOOP2:
OUT_OF_LOOP_P:
k = k % ctx->N;
/* Fp(x) = x^(N-k) * b(x) */