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Fix sp_add to handle carries properly

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This commit is contained in:
Sean Parkinson
2019-11-21 09:26:36 +10:00
parent 88fb7efb8c
commit a20db0b8ad
1 changed files with 3 additions and 3 deletions
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6
wolfcrypt/src/sp_int.c
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@@ -569,7 +569,7 @@ int sp_sub(sp_int* a, sp_int* b, sp_int* r)
}
for (; i < a->used; i++) {
r->dp[i] = a->dp[i] - c;
c = r->dp[i] == (sp_int_digit)-1;
c = (a->dp[i] == 0) && (r->dp[i] == (sp_int_digit)-1);
}
r->used = i;
sp_clamp(r);
@@ -829,11 +829,11 @@ int sp_add(sp_int* a, sp_int* b, sp_int* r)
}
for (; i < a->used; i++) {
r->dp[i] = a->dp[i] + c;
c = r->dp[i] == 0;
c = (a->dp[i] != 0) && (r->dp[i] == 0);
}
for (; i < b->used; i++) {
r->dp[i] = b->dp[i] + c;
c = r->dp[i] == 0;
c = (b->dp[i] != 0) && (r->dp[i] == 0);
}
r->dp[i] = c;
r->used = (int)(i + c);