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Merge pull request #5299 from SparkiDev/sp_submod_fix

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SP int math; submod fix
This commit is contained in:
David Garske
2022-06-29 18:52:15 -07:00
committed by GitHub
parent f2acaa8ee9 0159f17692
commit 9cc928cb29
1 changed files with 6 additions and 8 deletions
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14
wolfcrypt/src/sp_int.c
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@@ -6494,13 +6494,13 @@ int sp_submod(sp_int* a, sp_int* b, sp_int* m, sp_int* r)
ALLOC_SP_INT_ARRAY(t, used, 2, err, NULL);
if (err == MP_OKAY) {
if (_sp_cmp(a, m) == MP_GT) {
if (_sp_cmp(a, m) != MP_LT) {
err = sp_mod(a, m, t[0]);
a = t[0];
}
}
if (err == MP_OKAY) {
if (_sp_cmp(b, m) == MP_GT) {
if (_sp_cmp(b, m) != MP_LT) {
err = sp_mod(b, m, t[1]);
b = t[1];
}
@@ -6508,14 +6508,12 @@ int sp_submod(sp_int* a, sp_int* b, sp_int* m, sp_int* r)
if (err == MP_OKAY) {
if (_sp_cmp(a, b) == MP_LT) {
err = sp_add(a, m, t[0]);
if (err == MP_OKAY) {
err = sp_sub(t[0], b, r);
}
}
else {
err = sp_sub(a, b, r);
a = t[0];
}
}
if (err == MP_OKAY) {
err = sp_sub(a, b, r);
}
#if 0
if (err == MP_OKAY) {