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Merge pull request #6040 from SparkiDev/sp_invmod_mont_ct_err

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SP int: sp_invmod_mont_ct check err before setting
This commit is contained in:
David Garske 2023-02-05 14:17:51 -08:00 committed by GitHub
commit a8c2a9aeab
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 5 additions and 1 deletions
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6
wolfcrypt/src/sp_int.c
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@ -12051,7 +12051,9 @@ int sp_invmod_mont_ct(const sp_int* a, const sp_int* m, sp_int* r,
s = bit;
/* 6.4.4. t = (t * pre[j-1]) mod m */
err = sp_mul(t, pre[j-1], t);
if (err == MP_OKAY) {
err = sp_mul(t, pre[j-1], t);
}
if (err == MP_OKAY) {
err = _sp_mont_red(t, m, mp);
}
@ -12072,6 +12074,8 @@ int sp_invmod_mont_ct(const sp_int* a, const sp_int* m, sp_int* r,
err = _sp_mont_red(t, m, mp);
}
}
}
if (err == MP_OKAY) {
/* 8. If j > 0 then r = (t * pre[j-1]) mod m */
if (j > 0) {
err = sp_mul(t, pre[j-1], r);