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Merge pull request #3730 from guidovranken/zd11650

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SP math: Better error propagation
This commit is contained in:
Sean Parkinson
2021-02-08 14:17:43 +10:00
committed by GitHub
parent 2933db8915 358dbd5090
commit 36d124ed2f
1 changed files with 15 additions and 4 deletions
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17
wolfcrypt/src/sp_int.c
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@@ -7854,10 +7854,12 @@ int sp_invmod(sp_int* a, sp_int* m, sp_int* r)
} }
if (err == MP_OKAY) { if (err == MP_OKAY) {
_sp_sub_d(r, 1, r); _sp_sub_d(r, 1, r);
sp_div(r, a, r, NULL); err = sp_div(r, a, r, NULL);
if (err == MP_OKAY) {
sp_sub(m, r, r); sp_sub(m, r, r);
} }
} }
}
else { else {
sp_init(u); sp_init(u);
sp_init(b); sp_init(b);
@@ -8591,7 +8593,10 @@ static int _sp_exptmod_base_2(sp_int* e, int digits, sp_int* m, sp_int* r)
/* Square for number of bits in window. */ /* Square for number of bits in window. */
for (j = 0; (j < EXP2_WINSIZE) && (err == MP_OKAY); j++) { for (j = 0; (j < EXP2_WINSIZE) && (err == MP_OKAY); j++) {
err = sp_sqr(tr, tr); err = sp_sqr(tr, tr);
if ((err == MP_OKAY) && (m->used > 1)) { if (err != MP_OKAY) {
break;
}
if (m->used > 1) {
err = _sp_mont_red(tr, m, mp); err = _sp_mont_red(tr, m, mp);
} }
else { else {
@@ -8610,6 +8615,9 @@ static int _sp_exptmod_base_2(sp_int* e, int digits, sp_int* m, sp_int* r)
if (err == MP_OKAY) { if (err == MP_OKAY) {
err = sp_mod(tr, m, tr); err = sp_mod(tr, m, tr);
} }
if (err != MP_OKAY) {
break;
}
} }
} }
@@ -13671,7 +13679,10 @@ int sp_gcd(sp_int* a, sp_int* b, sp_int* r)
} }
} }
else { else {
sp_mod(u, v, t); err = sp_mod(u, v, t);
}
if (err != MP_OKAY) {
break;
} }
sp_copy(v, u); sp_copy(v, u);
sp_copy(t, v); sp_copy(t, v);